PAT-A1038

#include <stdio.h>#include<iostream>#include<string>#include<algorithm>using namespace std;bool cmp(string a, string b){return a+b<b+a;}int main(){int i, n;scanf("%d",&n);string ans, a[10010];for(i=0;i<n;i++)cin>>a[i];sort(a,a+n,cmp);for(i=0;i<n;i++)ans=ans+a[i];while(ans.size()>0&&ans[0]=='0')ans.erase(ans.begin());if(ans.size()==0)cout<<"0";//printf("0");else cout<<ans;}