修复二分法 Rust 示例错误

Author: alain

problems/0704.二分查找.md

@@ -501,39 +501,39 @@ func search(nums: [Int], target: Int) -> Int {
 
 ### **Rust:**
 
-（版本一）左闭右开区间
+（版本一）左闭右闭区间
 
 ```rust
 use std::cmp::Ordering;
 impl Solution {
     pub fn search(nums: Vec<i32>, target: i32) -> i32 {
-        let (mut left, mut right) = (0, nums.len());
-        while left < right {
+        let (mut left, mut right) = (0_i32, nums.len() as i32 - 1);
+        while left <= right {
             let mid = (right + left) / 2;
-            match nums[mid].cmp(&target) {
+            match nums[mid as usize].cmp(&target) {
                 Ordering::Less => left = mid + 1,
-                Ordering::Greater => right = mid,
-                Ordering::Equal => return mid as i32,
+                Ordering::Greater => right = mid - 1,
+                Ordering::Equal => return mid,
             }
         }
         -1
     }
 }
 ```
 
-//（版本二）左闭右闭区间
+//（版本二）左闭右开区间
 
 ```rust
 use std::cmp::Ordering;
 impl Solution {
     pub fn search(nums: Vec<i32>, target: i32) -> i32 {
-        let (mut left, mut right) = (0, nums.len());
-        while left <= right {
+        let (mut left, mut right) = (0_i32, nums.len() as i32);
+        while left < right {
             let mid = (right + left) / 2;
-            match nums[mid].cmp(&target) {
+            match nums[mid as usize].cmp(&target) {
                 Ordering::Less => left = mid + 1,
-                Ordering::Greater => right = mid - 1,
-                Ordering::Equal => return mid as i32,
+                Ordering::Greater => right = mid,
+                Ordering::Equal => return mid,
             }
         }
         -1