feat(chapter_backtracking): Add js and ts codes for chapter 13.3 (#667)

* feat(chapter_dynamic_programming): Add js and ts codes for chapter 14.1 * style(chapter_dynamic_programming): format code * refactor(chapter_dynamic_programming): remove main definition and add type * feat(chapter_backtracking): Add js and ts codes for chapter 13.3 * feat(chapter_divide_and_conquer): Add js and ts codes for chapter 12.2 * feat(chapter_divide_and_conquer): Add js and ts codes for chapter 12.3 * feat(chapter_divide_and_conquer): Add js and ts codes for chapter 12.4 * style(chapter_divide_and_conquer): fix typo * refactor: Use === instead of == in js and ts
2026-07-05 12:14:20 +00:00 · 2023-08-03 14:44:49 +08:00
parent c7c33f19ac
commit 70784a1ec3
31 changed files with 610 additions and 25 deletions
@@ -0,0 +1,39 @@
+/**
+ * File: binary_search_recur.js
+ * Created Time: 2023-07-30
+ * Author: yuan0221 (yl1452491917@gmail.com)
+ */
+
+/* 二分查找：问题 f(i, j) */
+function dfs(nums, target, i, j) {
+    // 若区间为空，代表无目标元素，则返回 -1
+    if (i > j) {
+        return -1;
+    }
+    // 计算中点索引 m
+    const m = i + ((j - i) >> 1);
+    if (nums[m] < target) {
+        // 递归子问题 f(m+1, j)
+        return dfs(nums, target, m + 1, j);
+    } else if (nums[m] > target) {
+        // 递归子问题 f(i, m-1)
+        return dfs(nums, target, i, m - 1);
+    } else {
+        // 找到目标元素，返回其索引
+        return m;
+    }
+}
+
+/* 二分查找 */
+function binarySearch(nums, target) {
+    const n = nums.length;
+    // 求解问题 f(0, n-1)
+    return dfs(nums, target, 0, n - 1);
+}
+
+/* Driver Code */
+const target = 6;
+const nums = [1, 3, 6, 8, 12, 15, 23, 26, 31, 35];
+// 二分查找（双闭区间）
+const index = binarySearch(nums, target);
+console.log(`目标元素 6 的索引 = ${index}`);