Leetcode January 13 daily question 747 At least twice the maximum number of other numbers

747. At least twice the maximum number of other numbers

Dish title , I don't think anyone will read this blog .
AC Code ：

class Solution {
    
public:
    int dominantIndex(vector<int>& nums) {
    
        int n = nums.size();
        if(n == 1)
            return 0;
        int max = 0;
        int res;
        for(int i = 0; i < n; i++)
            if(nums[i] > max) {
    
                res = i;
                max = nums[i];
            }  
        sort(nums.begin(), nums.end());        
        if(nums[n - 1] >= nums[n - 2] * 2)
            return res;
        return -1;
    }
};