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@@ -237,7 +237,22 @@ status: new
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=== "Rust"
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```rust title="binary_search_insertion.rs"
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[class]{}-[func]{binary_search_insertion}
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/* 二分查找插入点(存在重复元素) */
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pub fn binary_search_insertion(nums: &[i32], target: i32) -> i32 {
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let (mut i, mut j) = (0, nums.len() as i32 - 1); // 初始化双闭区间 [0, n-1]
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while i <= j {
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let m = i + (j - i) / 2; // 计算中点索引 m
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if nums[m as usize] < target {
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i = m + 1; // target 在区间 [m+1, j] 中
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} else if nums[m as usize] > target {
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j = m - 1; // target 在区间 [i, m-1] 中
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} else {
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j = m - 1; // 首个小于 target 的元素在区间 [i, m-1] 中
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}
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}
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// 返回插入点 i
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i
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}
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```
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## 10.2.2 存在重复元素的情况
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@@ -504,7 +519,22 @@ status: new
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=== "Rust"
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```rust title="binary_search_insertion.rs"
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[class]{}-[func]{binary_search_insertion}
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/* 二分查找插入点(存在重复元素) */
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pub fn binary_search_insertion(nums: &[i32], target: i32) -> i32 {
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let (mut i, mut j) = (0, nums.len() as i32 - 1); // 初始化双闭区间 [0, n-1]
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while i <= j {
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let m = i + (j - i) / 2; // 计算中点索引 m
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if nums[m as usize] < target {
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i = m + 1; // target 在区间 [m+1, j] 中
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} else if nums[m as usize] > target {
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j = m - 1; // target 在区间 [i, m-1] 中
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} else {
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j = m - 1; // 首个小于 target 的元素在区间 [i, m-1] 中
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}
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}
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// 返回插入点 i
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i
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}
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```
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!!! tip
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