题目描述

blablabla

class Solution {
public:
    int getNumberSameAsIndex(vector<int>& nums) {
        if (nums.empty()) return -1;
        int l = 0, r = nums.size();
        while(l < r) {
            int mid = l + r >> 1;
            if (nums[mid] == mid) return mid;
            if (nums[mid] > mid) r = mid;
            else l = mid + 1;
        }
        return -1;
    }
};

class Solution {
public:
    int getNumberSameAsIndex(vector<int>& nums) {
        if (nums.empty()) return -1;
        int l = 0, r = nums.size() - 1;
        while (l < r) {
            int mid = l + r >> 1;
            if (nums[mid] == mid) return mid;
            if (nums[mid] > mid) r = mid;
            else l = mid + 1;
        }
        if (nums[l] == l) return l;
        return -1;
    }
};