LeetCode 把数组排成最小的数

详细

class Solution {
public:
    static bool cmp(int a,int b){
        string ab = to_string(a) + to_string(b);
        string ba = to_string(b) + to_string(a);
        return ab < ba;
    }
    string minNumber(vector<int>& nums) {
        sort(nums.begin(),nums.end(),cmp);
        string res = "";
        for(auto it: nums){
            res += to_string(it);
        }
        return res;
    }
};