34. 在排序数组中查找元素的第一个和最后一个位置

Posted 2021-03-05

 1 class Solution 
 2 {
 3 public:
 4     vector<int> searchRange(vector<int>& nums, int target) 
 5     {
 6         auto it = find(nums.begin(),nums.end(),target);
 7         if(it == nums.end()) return {-1,-1};
 8         auto b = lower_bound(nums.begin(),nums.end(),target) - nums.begin();
 9         auto e = upper_bound(nums.begin(),nums.end(),target) - nums.begin();
10         return {b,e - 1};
11     }
12 };