注意：最小数为0时，要输出“0”

AC代码

#include 
     
      #include 
      
       #include 
       
        #include 
        
         using namespace std;bool cmp(const string& a,const string& b){    string reta,retb;    reta = a + b;    retb = b + a;    if(reta < retb)        return true;    else        return false;}int main(){    int n;    vector
         
           v;    scanf("%d",&n);    for(int i = 0;i < n;i++){        string tmp;        cin >> tmp;        v.push_back(tmp);    }    sort(v.begin(),v.end(),cmp);    bool first(true);    for(int i = 0;i < v.size();i++){        for(int j = 0;j < v[i].size();j++){            if(first && v[i][j] != '0' || !first){                printf("%c",v[i][j]);                first = false;            }         }    }    if(first)        printf("0\n");    return 0;}