BinarySearch.cpp

class Solution {
public:
    int search(vector<int>& nums, int target) {
        int left = 0;
        int right = nums.size()-1;
        while(left<=right){
            int mid = left + (right-left)/2;
            if(nums[mid] == target){
                return mid;
            }else if(target > nums[mid]){
                left = mid + 1;
            }else{
                right = mid - 1;
            }
        }
        return -1;
    }
};