LeetCode35 - Search Insert Position--二分查找，若不存在则返回应插入的位置

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