[Rust] Normalize mid calculation in case overflow (#1363)

* Normalize mid calculate in case overflow

* Change ALL language

* Update merge_sort.py

* Update merge_sort.zig

* Update binary_search_tree.zig

* Update binary_search_recur.py

---------

Co-authored-by: Yudong Jin <krahets@163.com>

codes/rust/chapter_divide_and_conquer/binary_search_recur.rs

@@ -10,7 +10,7 @@ fn dfs(nums: &[i32], target: i32, i: i32, j: i32) -> i32 {
     if i > j {
         return -1;
     }
-    let m: i32 = (i + j) / 2;
+    let m: i32 = i + (j - i) / 2;
     if nums[m as usize] < target {
         // 递归子问题 f(m+1, j)
         return dfs(nums, target, m + 1, j);

codes/rust/chapter_sorting/merge_sort.rs

@@ -48,7 +48,7 @@ fn merge_sort(nums: &mut [i32], left: usize, right: usize) {
     }
 
     // 划分阶段
-    let mid = (left + right) / 2; // 计算中点
+    let mid = left + (right - left) / 2; // 计算中点
     merge_sort(nums, left, mid); // 递归左子数组
     merge_sort(nums, mid + 1, right); // 递归右子数组
 

codes/rust/chapter_sorting/radix_sort.rs

@@ -35,9 +35,7 @@ fn counting_sort_digit(nums: &mut [i32], exp: i32) {
         counter[d] -= 1; // 将 d 的数量减 1
     }
     // 使用结果覆盖原数组 nums
-    for i in 0..n {
-        nums[i] = res[i];
-    }
+    nums.copy_from_slice(&res);
 }
 
 /* 基数排序 */