mirror of
https://github.com/krahets/hello-algo.git
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feat: Traditional Chinese version (#1163)
* First commit * Update mkdocs.yml * Translate all the docs to traditional Chinese * Translate the code files. * Translate the docker file * Fix mkdocs.yml * Translate all the figures from SC to TC * 二叉搜尋樹 -> 二元搜尋樹 * Update terminology. * Update terminology * 构造函数/构造方法 -> 建構子 异或 -> 互斥或 * 擴充套件 -> 擴展 * constant - 常量 - 常數 * 類 -> 類別 * AVL -> AVL 樹 * 數組 -> 陣列 * 係統 -> 系統 斐波那契數列 -> 費波那契數列 運算元量 -> 運算量 引數 -> 參數 * 聯絡 -> 關聯 * 麵試 -> 面試 * 面向物件 -> 物件導向 歸併排序 -> 合併排序 范式 -> 範式 * Fix 算法 -> 演算法 * 錶示 -> 表示 反碼 -> 一補數 補碼 -> 二補數 列列尾部 -> 佇列尾部 區域性性 -> 區域性 一摞 -> 一疊 * Synchronize with main branch * 賬號 -> 帳號 推匯 -> 推導 * Sync with main branch * First commit * Update mkdocs.yml * Translate all the docs to traditional Chinese * Translate the code files. * Translate the docker file * Fix mkdocs.yml * Translate all the figures from SC to TC * 二叉搜尋樹 -> 二元搜尋樹 * Update terminology * 构造函数/构造方法 -> 建構子 异或 -> 互斥或 * 擴充套件 -> 擴展 * constant - 常量 - 常數 * 類 -> 類別 * AVL -> AVL 樹 * 數組 -> 陣列 * 係統 -> 系統 斐波那契數列 -> 費波那契數列 運算元量 -> 運算量 引數 -> 參數 * 聯絡 -> 關聯 * 麵試 -> 面試 * 面向物件 -> 物件導向 歸併排序 -> 合併排序 范式 -> 範式 * Fix 算法 -> 演算法 * 錶示 -> 表示 反碼 -> 一補數 補碼 -> 二補數 列列尾部 -> 佇列尾部 區域性性 -> 區域性 一摞 -> 一疊 * Synchronize with main branch * 賬號 -> 帳號 推匯 -> 推導 * Sync with main branch * Update terminology.md * 操作数量(num. of operations)-> 操作數量 * 字首和->前綴和 * Update figures * 歸 -> 迴 記憶體洩漏 -> 記憶體流失 * Fix the bug of the file filter * 支援 -> 支持 Add zh-Hant/README.md * Add the zh-Hant chapter covers. Bug fixes. * 外掛 -> 擴充功能 * Add the landing page for zh-Hant version * Unify the font of the chapter covers for the zh, en, and zh-Hant version * Move zh-Hant/ to zh-hant/ * Translate terminology.md to traditional Chinese
This commit is contained in:
@@ -0,0 +1,41 @@
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/*
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* File: climbing_stairs_backtrack.rs
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* Created Time: 2023-07-09
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* Author: codingonion (coderonion@gmail.com)
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*/
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/* 回溯 */
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fn backtrack(choices: &[i32], state: i32, n: i32, res: &mut [i32]) {
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// 當爬到第 n 階時,方案數量加 1
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if state == n {
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res[0] = res[0] + 1;
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}
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// 走訪所有選擇
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for &choice in choices {
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// 剪枝:不允許越過第 n 階
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if state + choice > n {
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continue;
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}
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// 嘗試:做出選擇,更新狀態
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backtrack(choices, state + choice, n, res);
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// 回退
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}
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}
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/* 爬樓梯:回溯 */
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fn climbing_stairs_backtrack(n: usize) -> i32 {
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let choices = vec![1, 2]; // 可選擇向上爬 1 階或 2 階
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let state = 0; // 從第 0 階開始爬
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let mut res = Vec::new();
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res.push(0); // 使用 res[0] 記錄方案數量
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backtrack(&choices, state, n as i32, &mut res);
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res[0]
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}
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/* Driver Code */
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pub fn main() {
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let n: usize = 9;
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let res = climbing_stairs_backtrack(n);
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println!("爬 {n} 階樓梯共有 {res} 種方案");
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}
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@@ -0,0 +1,33 @@
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/*
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* File: climbing_stairs_constraint_dp.rs
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* Created Time: 2023-07-09
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* Author: codingonion (coderonion@gmail.com)
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*/
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/* 帶約束爬樓梯:動態規劃 */
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fn climbing_stairs_constraint_dp(n: usize) -> i32 {
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if n == 1 || n == 2 {
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return 1;
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};
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// 初始化 dp 表,用於儲存子問題的解
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let mut dp = vec![vec![-1; 3]; n + 1];
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// 初始狀態:預設最小子問題的解
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dp[1][1] = 1;
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dp[1][2] = 0;
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dp[2][1] = 0;
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dp[2][2] = 1;
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// 狀態轉移:從較小子問題逐步求解較大子問題
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for i in 3..=n {
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dp[i][1] = dp[i - 1][2];
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dp[i][2] = dp[i - 2][1] + dp[i - 2][2];
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}
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dp[n][1] + dp[n][2]
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}
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/* Driver Code */
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pub fn main() {
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let n: usize = 9;
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let res = climbing_stairs_constraint_dp(n);
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println!("爬 {n} 階樓梯共有 {res} 種方案");
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}
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@@ -0,0 +1,29 @@
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/*
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* File: climbing_stairs_dfs.rs
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* Created Time: 2023-07-09
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* Author: codingonion (coderonion@gmail.com)
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*/
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/* 搜尋 */
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fn dfs(i: usize) -> i32 {
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// 已知 dp[1] 和 dp[2] ,返回之
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if i == 1 || i == 2 {
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return i as i32;
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}
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// dp[i] = dp[i-1] + dp[i-2]
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let count = dfs(i - 1) + dfs(i - 2);
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count
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}
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/* 爬樓梯:搜尋 */
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fn climbing_stairs_dfs(n: usize) -> i32 {
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dfs(n)
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}
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/* Driver Code */
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pub fn main() {
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let n: usize = 9;
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let res = climbing_stairs_dfs(n);
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println!("爬 {n} 階樓梯共有 {res} 種方案");
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}
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@@ -0,0 +1,37 @@
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/*
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* File: climbing_stairs_dfs_mem.rs
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* Created Time: 2023-07-09
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* Author: codingonion (coderonion@gmail.com)
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*/
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/* 記憶化搜尋 */
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fn dfs(i: usize, mem: &mut [i32]) -> i32 {
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// 已知 dp[1] 和 dp[2] ,返回之
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if i == 1 || i == 2 {
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return i as i32;
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}
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// 若存在記錄 dp[i] ,則直接返回之
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if mem[i] != -1 {
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return mem[i];
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}
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// dp[i] = dp[i-1] + dp[i-2]
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let count = dfs(i - 1, mem) + dfs(i - 2, mem);
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// 記錄 dp[i]
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mem[i] = count;
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count
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}
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/* 爬樓梯:記憶化搜尋 */
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fn climbing_stairs_dfs_mem(n: usize) -> i32 {
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// mem[i] 記錄爬到第 i 階的方案總數,-1 代表無記錄
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let mut mem = vec![-1; n + 1];
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dfs(n, &mut mem)
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}
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/* Driver Code */
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pub fn main() {
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let n: usize = 9;
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let res = climbing_stairs_dfs_mem(n);
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println!("爬 {n} 階樓梯共有 {res} 種方案");
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}
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@@ -0,0 +1,48 @@
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/*
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* File: climbing_stairs_dp.rs
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* Created Time: 2023-07-09
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* Author: codingonion (coderonion@gmail.com)
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*/
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/* 爬樓梯:動態規劃 */
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fn climbing_stairs_dp(n: usize) -> i32 {
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// 已知 dp[1] 和 dp[2] ,返回之
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if n == 1 || n == 2 {
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return n as i32;
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}
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// 初始化 dp 表,用於儲存子問題的解
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let mut dp = vec![-1; n + 1];
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// 初始狀態:預設最小子問題的解
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dp[1] = 1;
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dp[2] = 2;
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// 狀態轉移:從較小子問題逐步求解較大子問題
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for i in 3..=n {
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dp[i] = dp[i - 1] + dp[i - 2];
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}
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dp[n]
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}
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/* 爬樓梯:空間最佳化後的動態規劃 */
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fn climbing_stairs_dp_comp(n: usize) -> i32 {
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if n == 1 || n == 2 {
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return n as i32;
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}
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let (mut a, mut b) = (1, 2);
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for _ in 3..=n {
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let tmp = b;
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b = a + b;
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a = tmp;
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}
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b
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}
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/* Driver Code */
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pub fn main() {
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let n: usize = 9;
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let res = climbing_stairs_dp(n);
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println!("爬 {n} 階樓梯共有 {res} 種方案");
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let res = climbing_stairs_dp_comp(n);
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println!("爬 {n} 階樓梯共有 {res} 種方案");
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}
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@@ -0,0 +1,75 @@
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/*
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* File: coin_change.rs
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* Created Time: 2023-07-09
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* Author: codingonion (coderonion@gmail.com)
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*/
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/* 零錢兌換:動態規劃 */
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fn coin_change_dp(coins: &[i32], amt: usize) -> i32 {
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let n = coins.len();
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let max = amt + 1;
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// 初始化 dp 表
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let mut dp = vec![vec![0; amt + 1]; n + 1];
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// 狀態轉移:首行首列
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for a in 1..=amt {
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dp[0][a] = max;
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}
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// 狀態轉移:其餘行和列
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for i in 1..=n {
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for a in 1..=amt {
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if coins[i - 1] > a as i32 {
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// 若超過目標金額,則不選硬幣 i
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dp[i][a] = dp[i - 1][a];
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} else {
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// 不選和選硬幣 i 這兩種方案的較小值
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dp[i][a] = std::cmp::min(dp[i - 1][a], dp[i][a - coins[i - 1] as usize] + 1);
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}
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}
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}
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if dp[n][amt] != max {
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return dp[n][amt] as i32;
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} else {
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-1
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}
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}
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/* 零錢兌換:空間最佳化後的動態規劃 */
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fn coin_change_dp_comp(coins: &[i32], amt: usize) -> i32 {
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let n = coins.len();
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let max = amt + 1;
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// 初始化 dp 表
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let mut dp = vec![0; amt + 1];
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dp.fill(max);
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dp[0] = 0;
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// 狀態轉移
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for i in 1..=n {
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for a in 1..=amt {
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if coins[i - 1] > a as i32 {
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// 若超過目標金額,則不選硬幣 i
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dp[a] = dp[a];
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} else {
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// 不選和選硬幣 i 這兩種方案的較小值
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dp[a] = std::cmp::min(dp[a], dp[a - coins[i - 1] as usize] + 1);
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}
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}
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}
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if dp[amt] != max {
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return dp[amt] as i32;
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} else {
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-1
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}
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}
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/* Driver Code */
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pub fn main() {
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let coins = [1, 2, 5];
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let amt: usize = 4;
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// 動態規劃
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let res = coin_change_dp(&coins, amt);
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println!("湊到目標金額所需的最少硬幣數量為 {res}");
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// 空間最佳化後的動態規劃
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let res = coin_change_dp_comp(&coins, amt);
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println!("湊到目標金額所需的最少硬幣數量為 {res}");
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}
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@@ -0,0 +1,64 @@
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/*
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* File: coin_change_ii.rs
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* Created Time: 2023-07-09
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* Author: codingonion (coderonion@gmail.com)
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*/
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/* 零錢兌換 II:動態規劃 */
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fn coin_change_ii_dp(coins: &[i32], amt: usize) -> i32 {
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let n = coins.len();
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// 初始化 dp 表
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let mut dp = vec![vec![0; amt + 1]; n + 1];
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// 初始化首列
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for i in 0..=n {
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dp[i][0] = 1;
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}
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// 狀態轉移
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for i in 1..=n {
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for a in 1..=amt {
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if coins[i - 1] > a as i32 {
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// 若超過目標金額,則不選硬幣 i
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dp[i][a] = dp[i - 1][a];
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} else {
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// 不選和選硬幣 i 這兩種方案之和
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dp[i][a] = dp[i - 1][a] + dp[i][a - coins[i - 1] as usize];
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}
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}
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}
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dp[n][amt]
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}
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/* 零錢兌換 II:空間最佳化後的動態規劃 */
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fn coin_change_ii_dp_comp(coins: &[i32], amt: usize) -> i32 {
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let n = coins.len();
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// 初始化 dp 表
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let mut dp = vec![0; amt + 1];
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dp[0] = 1;
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// 狀態轉移
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for i in 1..=n {
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for a in 1..=amt {
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if coins[i - 1] > a as i32 {
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// 若超過目標金額,則不選硬幣 i
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dp[a] = dp[a];
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} else {
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// 不選和選硬幣 i 這兩種方案之和
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dp[a] = dp[a] + dp[a - coins[i - 1] as usize];
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}
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}
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}
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dp[amt]
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}
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/* Driver Code */
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pub fn main() {
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let coins = [1, 2, 5];
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let amt: usize = 5;
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// 動態規劃
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let res = coin_change_ii_dp(&coins, amt);
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println!("湊出目標金額的硬幣組合數量為 {res}");
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// 空間最佳化後的動態規劃
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let res = coin_change_ii_dp_comp(&coins, amt);
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println!("湊出目標金額的硬幣組合數量為 {res}");
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}
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@@ -0,0 +1,145 @@
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/*
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* File: edit_distance.rs
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* Created Time: 2023-07-09
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* Author: codingonion (coderonion@gmail.com)
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*/
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/* 編輯距離:暴力搜尋 */
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fn edit_distance_dfs(s: &str, t: &str, i: usize, j: usize) -> i32 {
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// 若 s 和 t 都為空,則返回 0
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if i == 0 && j == 0 {
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return 0;
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}
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// 若 s 為空,則返回 t 長度
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if i == 0 {
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return j as i32;
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}
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// 若 t 為空,則返回 s 長度
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if j == 0 {
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return i as i32;
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}
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// 若兩字元相等,則直接跳過此兩字元
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if s.chars().nth(i - 1) == t.chars().nth(j - 1) {
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return edit_distance_dfs(s, t, i - 1, j - 1);
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}
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// 最少編輯步數 = 插入、刪除、替換這三種操作的最少編輯步數 + 1
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let insert = edit_distance_dfs(s, t, i, j - 1);
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let delete = edit_distance_dfs(s, t, i - 1, j);
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let replace = edit_distance_dfs(s, t, i - 1, j - 1);
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// 返回最少編輯步數
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std::cmp::min(std::cmp::min(insert, delete), replace) + 1
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}
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/* 編輯距離:記憶化搜尋 */
|
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fn edit_distance_dfs_mem(s: &str, t: &str, mem: &mut Vec<Vec<i32>>, i: usize, j: usize) -> i32 {
|
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// 若 s 和 t 都為空,則返回 0
|
||||
if i == 0 && j == 0 {
|
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return 0;
|
||||
}
|
||||
// 若 s 為空,則返回 t 長度
|
||||
if i == 0 {
|
||||
return j as i32;
|
||||
}
|
||||
// 若 t 為空,則返回 s 長度
|
||||
if j == 0 {
|
||||
return i as i32;
|
||||
}
|
||||
// 若已有記錄,則直接返回之
|
||||
if mem[i][j] != -1 {
|
||||
return mem[i][j];
|
||||
}
|
||||
// 若兩字元相等,則直接跳過此兩字元
|
||||
if s.chars().nth(i - 1) == t.chars().nth(j - 1) {
|
||||
return edit_distance_dfs_mem(s, t, mem, i - 1, j - 1);
|
||||
}
|
||||
// 最少編輯步數 = 插入、刪除、替換這三種操作的最少編輯步數 + 1
|
||||
let insert = edit_distance_dfs_mem(s, t, mem, i, j - 1);
|
||||
let delete = edit_distance_dfs_mem(s, t, mem, i - 1, j);
|
||||
let replace = edit_distance_dfs_mem(s, t, mem, i - 1, j - 1);
|
||||
// 記錄並返回最少編輯步數
|
||||
mem[i][j] = std::cmp::min(std::cmp::min(insert, delete), replace) + 1;
|
||||
mem[i][j]
|
||||
}
|
||||
|
||||
/* 編輯距離:動態規劃 */
|
||||
fn edit_distance_dp(s: &str, t: &str) -> i32 {
|
||||
let (n, m) = (s.len(), t.len());
|
||||
let mut dp = vec![vec![0; m + 1]; n + 1];
|
||||
// 狀態轉移:首行首列
|
||||
for i in 1..=n {
|
||||
dp[i][0] = i as i32;
|
||||
}
|
||||
for j in 1..m {
|
||||
dp[0][j] = j as i32;
|
||||
}
|
||||
// 狀態轉移:其餘行和列
|
||||
for i in 1..=n {
|
||||
for j in 1..=m {
|
||||
if s.chars().nth(i - 1) == t.chars().nth(j - 1) {
|
||||
// 若兩字元相等,則直接跳過此兩字元
|
||||
dp[i][j] = dp[i - 1][j - 1];
|
||||
} else {
|
||||
// 最少編輯步數 = 插入、刪除、替換這三種操作的最少編輯步數 + 1
|
||||
dp[i][j] =
|
||||
std::cmp::min(std::cmp::min(dp[i][j - 1], dp[i - 1][j]), dp[i - 1][j - 1]) + 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
dp[n][m]
|
||||
}
|
||||
|
||||
/* 編輯距離:空間最佳化後的動態規劃 */
|
||||
fn edit_distance_dp_comp(s: &str, t: &str) -> i32 {
|
||||
let (n, m) = (s.len(), t.len());
|
||||
let mut dp = vec![0; m + 1];
|
||||
// 狀態轉移:首行
|
||||
for j in 1..m {
|
||||
dp[j] = j as i32;
|
||||
}
|
||||
// 狀態轉移:其餘行
|
||||
for i in 1..=n {
|
||||
// 狀態轉移:首列
|
||||
let mut leftup = dp[0]; // 暫存 dp[i-1, j-1]
|
||||
dp[0] = i as i32;
|
||||
// 狀態轉移:其餘列
|
||||
for j in 1..=m {
|
||||
let temp = dp[j];
|
||||
if s.chars().nth(i - 1) == t.chars().nth(j - 1) {
|
||||
// 若兩字元相等,則直接跳過此兩字元
|
||||
dp[j] = leftup;
|
||||
} else {
|
||||
// 最少編輯步數 = 插入、刪除、替換這三種操作的最少編輯步數 + 1
|
||||
dp[j] = std::cmp::min(std::cmp::min(dp[j - 1], dp[j]), leftup) + 1;
|
||||
}
|
||||
leftup = temp; // 更新為下一輪的 dp[i-1, j-1]
|
||||
}
|
||||
}
|
||||
dp[m]
|
||||
}
|
||||
|
||||
/* Driver Code */
|
||||
pub fn main() {
|
||||
let s = "bag";
|
||||
let t = "pack";
|
||||
let (n, m) = (s.len(), t.len());
|
||||
|
||||
// 暴力搜尋
|
||||
let res = edit_distance_dfs(s, t, n, m);
|
||||
println!("將 {s} 更改為 {t} 最少需要編輯 {res} 步");
|
||||
|
||||
// 記憶搜尋
|
||||
let mut mem = vec![vec![0; m + 1]; n + 1];
|
||||
for row in mem.iter_mut() {
|
||||
row.fill(-1);
|
||||
}
|
||||
let res = edit_distance_dfs_mem(s, t, &mut mem, n, m);
|
||||
println!("將 {s} 更改為 {t} 最少需要編輯 {res} 步");
|
||||
|
||||
// 動態規劃
|
||||
let res = edit_distance_dp(s, t);
|
||||
println!("將 {s} 更改為 {t} 最少需要編輯 {res} 步");
|
||||
|
||||
// 空間最佳化後的動態規劃
|
||||
let res = edit_distance_dp_comp(s, t);
|
||||
println!("將 {s} 更改為 {t} 最少需要編輯 {res} 步");
|
||||
}
|
||||
@@ -0,0 +1,113 @@
|
||||
/*
|
||||
* File: knapsack.rs
|
||||
* Created Time: 2023-07-09
|
||||
* Author: codingonion (coderonion@gmail.com)
|
||||
*/
|
||||
|
||||
/* 0-1 背包:暴力搜尋 */
|
||||
fn knapsack_dfs(wgt: &[i32], val: &[i32], i: usize, c: usize) -> i32 {
|
||||
// 若已選完所有物品或背包無剩餘容量,則返回價值 0
|
||||
if i == 0 || c == 0 {
|
||||
return 0;
|
||||
}
|
||||
// 若超過背包容量,則只能選擇不放入背包
|
||||
if wgt[i - 1] > c as i32 {
|
||||
return knapsack_dfs(wgt, val, i - 1, c);
|
||||
}
|
||||
// 計算不放入和放入物品 i 的最大價值
|
||||
let no = knapsack_dfs(wgt, val, i - 1, c);
|
||||
let yes = knapsack_dfs(wgt, val, i - 1, c - wgt[i - 1] as usize) + val[i - 1];
|
||||
// 返回兩種方案中價值更大的那一個
|
||||
std::cmp::max(no, yes)
|
||||
}
|
||||
|
||||
/* 0-1 背包:記憶化搜尋 */
|
||||
fn knapsack_dfs_mem(wgt: &[i32], val: &[i32], mem: &mut Vec<Vec<i32>>, i: usize, c: usize) -> i32 {
|
||||
// 若已選完所有物品或背包無剩餘容量,則返回價值 0
|
||||
if i == 0 || c == 0 {
|
||||
return 0;
|
||||
}
|
||||
// 若已有記錄,則直接返回
|
||||
if mem[i][c] != -1 {
|
||||
return mem[i][c];
|
||||
}
|
||||
// 若超過背包容量,則只能選擇不放入背包
|
||||
if wgt[i - 1] > c as i32 {
|
||||
return knapsack_dfs_mem(wgt, val, mem, i - 1, c);
|
||||
}
|
||||
// 計算不放入和放入物品 i 的最大價值
|
||||
let no = knapsack_dfs_mem(wgt, val, mem, i - 1, c);
|
||||
let yes = knapsack_dfs_mem(wgt, val, mem, i - 1, c - wgt[i - 1] as usize) + val[i - 1];
|
||||
// 記錄並返回兩種方案中價值更大的那一個
|
||||
mem[i][c] = std::cmp::max(no, yes);
|
||||
mem[i][c]
|
||||
}
|
||||
|
||||
/* 0-1 背包:動態規劃 */
|
||||
fn knapsack_dp(wgt: &[i32], val: &[i32], cap: usize) -> i32 {
|
||||
let n = wgt.len();
|
||||
// 初始化 dp 表
|
||||
let mut dp = vec![vec![0; cap + 1]; n + 1];
|
||||
// 狀態轉移
|
||||
for i in 1..=n {
|
||||
for c in 1..=cap {
|
||||
if wgt[i - 1] > c as i32 {
|
||||
// 若超過背包容量,則不選物品 i
|
||||
dp[i][c] = dp[i - 1][c];
|
||||
} else {
|
||||
// 不選和選物品 i 這兩種方案的較大值
|
||||
dp[i][c] = std::cmp::max(
|
||||
dp[i - 1][c],
|
||||
dp[i - 1][c - wgt[i - 1] as usize] + val[i - 1],
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
dp[n][cap]
|
||||
}
|
||||
|
||||
/* 0-1 背包:空間最佳化後的動態規劃 */
|
||||
fn knapsack_dp_comp(wgt: &[i32], val: &[i32], cap: usize) -> i32 {
|
||||
let n = wgt.len();
|
||||
// 初始化 dp 表
|
||||
let mut dp = vec![0; cap + 1];
|
||||
// 狀態轉移
|
||||
for i in 1..=n {
|
||||
// 倒序走訪
|
||||
for c in (1..=cap).rev() {
|
||||
if wgt[i - 1] <= c as i32 {
|
||||
// 不選和選物品 i 這兩種方案的較大值
|
||||
dp[c] = std::cmp::max(dp[c], dp[c - wgt[i - 1] as usize] + val[i - 1]);
|
||||
}
|
||||
}
|
||||
}
|
||||
dp[cap]
|
||||
}
|
||||
|
||||
/* Driver Code */
|
||||
pub fn main() {
|
||||
let wgt = [10, 20, 30, 40, 50];
|
||||
let val = [50, 120, 150, 210, 240];
|
||||
let cap: usize = 50;
|
||||
let n = wgt.len();
|
||||
|
||||
// 暴力搜尋
|
||||
let res = knapsack_dfs(&wgt, &val, n, cap);
|
||||
println!("不超過背包容量的最大物品價值為 {res}");
|
||||
|
||||
// 記憶搜尋
|
||||
let mut mem = vec![vec![0; cap + 1]; n + 1];
|
||||
for row in mem.iter_mut() {
|
||||
row.fill(-1);
|
||||
}
|
||||
let res = knapsack_dfs_mem(&wgt, &val, &mut mem, n, cap);
|
||||
println!("不超過背包容量的最大物品價值為 {res}");
|
||||
|
||||
// 動態規劃
|
||||
let res = knapsack_dp(&wgt, &val, cap);
|
||||
println!("不超過背包容量的最大物品價值為 {res}");
|
||||
|
||||
// 空間最佳化後的動態規劃
|
||||
let res = knapsack_dp_comp(&wgt, &val, cap);
|
||||
println!("不超過背包容量的最大物品價值為 {res}");
|
||||
}
|
||||
@@ -0,0 +1,52 @@
|
||||
/*
|
||||
* File: min_cost_climbing_stairs_dp.rs
|
||||
* Created Time: 2023-07-09
|
||||
* Author: codingonion (coderonion@gmail.com)
|
||||
*/
|
||||
|
||||
use std::cmp;
|
||||
|
||||
/* 爬樓梯最小代價:動態規劃 */
|
||||
fn min_cost_climbing_stairs_dp(cost: &[i32]) -> i32 {
|
||||
let n = cost.len() - 1;
|
||||
if n == 1 || n == 2 {
|
||||
return cost[n];
|
||||
}
|
||||
// 初始化 dp 表,用於儲存子問題的解
|
||||
let mut dp = vec![-1; n + 1];
|
||||
// 初始狀態:預設最小子問題的解
|
||||
dp[1] = cost[1];
|
||||
dp[2] = cost[2];
|
||||
// 狀態轉移:從較小子問題逐步求解較大子問題
|
||||
for i in 3..=n {
|
||||
dp[i] = cmp::min(dp[i - 1], dp[i - 2]) + cost[i];
|
||||
}
|
||||
dp[n]
|
||||
}
|
||||
|
||||
/* 爬樓梯最小代價:空間最佳化後的動態規劃 */
|
||||
fn min_cost_climbing_stairs_dp_comp(cost: &[i32]) -> i32 {
|
||||
let n = cost.len() - 1;
|
||||
if n == 1 || n == 2 {
|
||||
return cost[n];
|
||||
};
|
||||
let (mut a, mut b) = (cost[1], cost[2]);
|
||||
for i in 3..=n {
|
||||
let tmp = b;
|
||||
b = cmp::min(a, tmp) + cost[i];
|
||||
a = tmp;
|
||||
}
|
||||
b
|
||||
}
|
||||
|
||||
/* Driver Code */
|
||||
pub fn main() {
|
||||
let cost = [0, 1, 10, 1, 1, 1, 10, 1, 1, 10, 1];
|
||||
println!("輸入樓梯的代價串列為 {:?}", &cost);
|
||||
|
||||
let res = min_cost_climbing_stairs_dp(&cost);
|
||||
println!("爬完樓梯的最低代價為 {res}");
|
||||
|
||||
let res = min_cost_climbing_stairs_dp_comp(&cost);
|
||||
println!("爬完樓梯的最低代價為 {res}");
|
||||
}
|
||||
@@ -0,0 +1,120 @@
|
||||
/*
|
||||
* File: min_path_sum.rs
|
||||
* Created Time: 2023-07-09
|
||||
* Author: codingonion (coderonion@gmail.com)
|
||||
*/
|
||||
|
||||
/* 最小路徑和:暴力搜尋 */
|
||||
fn min_path_sum_dfs(grid: &Vec<Vec<i32>>, i: i32, j: i32) -> i32 {
|
||||
// 若為左上角單元格,則終止搜尋
|
||||
if i == 0 && j == 0 {
|
||||
return grid[0][0];
|
||||
}
|
||||
// 若行列索引越界,則返回 +∞ 代價
|
||||
if i < 0 || j < 0 {
|
||||
return i32::MAX;
|
||||
}
|
||||
// 計算從左上角到 (i-1, j) 和 (i, j-1) 的最小路徑代價
|
||||
let up = min_path_sum_dfs(grid, i - 1, j);
|
||||
let left = min_path_sum_dfs(grid, i, j - 1);
|
||||
// 返回從左上角到 (i, j) 的最小路徑代價
|
||||
std::cmp::min(left, up) + grid[i as usize][j as usize]
|
||||
}
|
||||
|
||||
/* 最小路徑和:記憶化搜尋 */
|
||||
fn min_path_sum_dfs_mem(grid: &Vec<Vec<i32>>, mem: &mut Vec<Vec<i32>>, i: i32, j: i32) -> i32 {
|
||||
// 若為左上角單元格,則終止搜尋
|
||||
if i == 0 && j == 0 {
|
||||
return grid[0][0];
|
||||
}
|
||||
// 若行列索引越界,則返回 +∞ 代價
|
||||
if i < 0 || j < 0 {
|
||||
return i32::MAX;
|
||||
}
|
||||
// 若已有記錄,則直接返回
|
||||
if mem[i as usize][j as usize] != -1 {
|
||||
return mem[i as usize][j as usize];
|
||||
}
|
||||
// 左邊和上邊單元格的最小路徑代價
|
||||
let up = min_path_sum_dfs_mem(grid, mem, i - 1, j);
|
||||
let left = min_path_sum_dfs_mem(grid, mem, i, j - 1);
|
||||
// 記錄並返回左上角到 (i, j) 的最小路徑代價
|
||||
mem[i as usize][j as usize] = std::cmp::min(left, up) + grid[i as usize][j as usize];
|
||||
mem[i as usize][j as usize]
|
||||
}
|
||||
|
||||
/* 最小路徑和:動態規劃 */
|
||||
fn min_path_sum_dp(grid: &Vec<Vec<i32>>) -> i32 {
|
||||
let (n, m) = (grid.len(), grid[0].len());
|
||||
// 初始化 dp 表
|
||||
let mut dp = vec![vec![0; m]; n];
|
||||
dp[0][0] = grid[0][0];
|
||||
// 狀態轉移:首行
|
||||
for j in 1..m {
|
||||
dp[0][j] = dp[0][j - 1] + grid[0][j];
|
||||
}
|
||||
// 狀態轉移:首列
|
||||
for i in 1..n {
|
||||
dp[i][0] = dp[i - 1][0] + grid[i][0];
|
||||
}
|
||||
// 狀態轉移:其餘行和列
|
||||
for i in 1..n {
|
||||
for j in 1..m {
|
||||
dp[i][j] = std::cmp::min(dp[i][j - 1], dp[i - 1][j]) + grid[i][j];
|
||||
}
|
||||
}
|
||||
dp[n - 1][m - 1]
|
||||
}
|
||||
|
||||
/* 最小路徑和:空間最佳化後的動態規劃 */
|
||||
fn min_path_sum_dp_comp(grid: &Vec<Vec<i32>>) -> i32 {
|
||||
let (n, m) = (grid.len(), grid[0].len());
|
||||
// 初始化 dp 表
|
||||
let mut dp = vec![0; m];
|
||||
// 狀態轉移:首行
|
||||
dp[0] = grid[0][0];
|
||||
for j in 1..m {
|
||||
dp[j] = dp[j - 1] + grid[0][j];
|
||||
}
|
||||
// 狀態轉移:其餘行
|
||||
for i in 1..n {
|
||||
// 狀態轉移:首列
|
||||
dp[0] = dp[0] + grid[i][0];
|
||||
// 狀態轉移:其餘列
|
||||
for j in 1..m {
|
||||
dp[j] = std::cmp::min(dp[j - 1], dp[j]) + grid[i][j];
|
||||
}
|
||||
}
|
||||
dp[m - 1]
|
||||
}
|
||||
|
||||
/* Driver Code */
|
||||
pub fn main() {
|
||||
let grid = vec![
|
||||
vec![1, 3, 1, 5],
|
||||
vec![2, 2, 4, 2],
|
||||
vec![5, 3, 2, 1],
|
||||
vec![4, 3, 5, 2],
|
||||
];
|
||||
let (n, m) = (grid.len(), grid[0].len());
|
||||
|
||||
// 暴力搜尋
|
||||
let res = min_path_sum_dfs(&grid, n as i32 - 1, m as i32 - 1);
|
||||
println!("從左上角到右下角的最小路徑和為 {res}");
|
||||
|
||||
// 記憶化搜尋
|
||||
let mut mem = vec![vec![0; m]; n];
|
||||
for row in mem.iter_mut() {
|
||||
row.fill(-1);
|
||||
}
|
||||
let res = min_path_sum_dfs_mem(&grid, &mut mem, n as i32 - 1, m as i32 - 1);
|
||||
println!("從左上角到右下角的最小路徑和為 {res}");
|
||||
|
||||
// 動態規劃
|
||||
let res = min_path_sum_dp(&grid);
|
||||
println!("從左上角到右下角的最小路徑和為 {res}");
|
||||
|
||||
// 空間最佳化後的動態規劃
|
||||
let res = min_path_sum_dp_comp(&grid);
|
||||
println!("從左上角到右下角的最小路徑和為 {res}");
|
||||
}
|
||||
@@ -0,0 +1,60 @@
|
||||
/*
|
||||
* File: unbounded_knapsack.rs
|
||||
* Created Time: 2023-07-09
|
||||
* Author: codingonion (coderonion@gmail.com)
|
||||
*/
|
||||
|
||||
/* 完全背包:動態規劃 */
|
||||
fn unbounded_knapsack_dp(wgt: &[i32], val: &[i32], cap: usize) -> i32 {
|
||||
let n = wgt.len();
|
||||
// 初始化 dp 表
|
||||
let mut dp = vec![vec![0; cap + 1]; n + 1];
|
||||
// 狀態轉移
|
||||
for i in 1..=n {
|
||||
for c in 1..=cap {
|
||||
if wgt[i - 1] > c as i32 {
|
||||
// 若超過背包容量,則不選物品 i
|
||||
dp[i][c] = dp[i - 1][c];
|
||||
} else {
|
||||
// 不選和選物品 i 這兩種方案的較大值
|
||||
dp[i][c] = std::cmp::max(dp[i - 1][c], dp[i][c - wgt[i - 1] as usize] + val[i - 1]);
|
||||
}
|
||||
}
|
||||
}
|
||||
return dp[n][cap];
|
||||
}
|
||||
|
||||
/* 完全背包:空間最佳化後的動態規劃 */
|
||||
fn unbounded_knapsack_dp_comp(wgt: &[i32], val: &[i32], cap: usize) -> i32 {
|
||||
let n = wgt.len();
|
||||
// 初始化 dp 表
|
||||
let mut dp = vec![0; cap + 1];
|
||||
// 狀態轉移
|
||||
for i in 1..=n {
|
||||
for c in 1..=cap {
|
||||
if wgt[i - 1] > c as i32 {
|
||||
// 若超過背包容量,則不選物品 i
|
||||
dp[c] = dp[c];
|
||||
} else {
|
||||
// 不選和選物品 i 這兩種方案的較大值
|
||||
dp[c] = std::cmp::max(dp[c], dp[c - wgt[i - 1] as usize] + val[i - 1]);
|
||||
}
|
||||
}
|
||||
}
|
||||
dp[cap]
|
||||
}
|
||||
|
||||
/* Driver Code */
|
||||
pub fn main() {
|
||||
let wgt = [1, 2, 3];
|
||||
let val = [5, 11, 15];
|
||||
let cap: usize = 4;
|
||||
|
||||
// 動態規劃
|
||||
let res = unbounded_knapsack_dp(&wgt, &val, cap);
|
||||
println!("不超過背包容量的最大物品價值為 {res}");
|
||||
|
||||
// 空間最佳化後的動態規劃
|
||||
let res = unbounded_knapsack_dp_comp(&wgt, &val, cap);
|
||||
println!("不超過背包容量的最大物品價值為 {res}");
|
||||
}
|
||||
Reference in New Issue
Block a user