diff --git a/problems/0034.在排序数组中查找元素的第一个和最后一个位置.md b/problems/0034.在排序数组中查找元素的第一个和最后一个位置.md index b4128166..3bf90e3b 100644 --- a/problems/0034.在排序数组中查找元素的第一个和最后一个位置.md +++ b/problems/0034.在排序数组中查找元素的第一个和最后一个位置.md @@ -329,6 +329,67 @@ class Solution { } ``` +### C# + +```c# +public int[] SearchRange(int[] nums, int target) { + + var leftBorder = GetLeftBorder(nums, target); + var rightBorder = GetRightBorder(nums, target); + + if (leftBorder == -2 || rightBorder == -2) { + return new int[] {-1, -1}; + } + + if (rightBorder - leftBorder >=2) { + return new int[] {leftBorder + 1, rightBorder - 1}; + } + + return new int[] {-1, -1}; + +} + +public int GetLeftBorder(int[] nums, int target){ + var left = 0; + var right = nums.Length - 1; + var leftBorder = -2; + + while (left <= right) { + var mid = (left + right) / 2; + + if (target <= nums[mid]) { + right = mid - 1; + leftBorder = right; + } + else { + left = mid + 1; + } + } + + return leftBorder; +} + +public int GetRightBorder(int[] nums, int target){ + var left = 0; + var right = nums.Length - 1; + var rightBorder = -2; + + while (left <= right) { + var mid = (left + right) / 2; + + if (target >= nums[mid]) { + left = mid + 1; + rightBorder = left; + } + else { + right = mid - 1; + } + } + + return rightBorder; +} +``` + ### Python