题目：

题解：

class Solution {
public:string largestNumber(vector<int> &nums) {sort(nums.begin(), nums.end(), [](const int &x, const int &y) {return to_string(x) + to_string(y) > to_string(y) + to_string(x);});if (nums[0] == 0) {return "0";}string ret;for (int &x : nums) {ret += to_string(x);}return ret;}
};