class Solution {
public:

    static bool cmp(int a,int b){
        string s1 = to_string(a) + to_string(b);
        string s2 = to_string(b) + to_string(a);
        return s1 < s2;
    }

    string printMinNumber(vector<int>& nums) {
        string str;
        if(!nums.size()) return str;
        sort(nums.begin(),nums.end(),cmp);
        for(auto x:nums)
            str += to_string(x);
        return str;
    }
};