注意前导零的消去。

#include <iostream>
#include <string>
#include <sstream>
#include <algorithm>
using namespace std; string s[+];
int n; bool cmp(const string &a, const string &b)
{
return a+b<b+a;
} int main()
{
cin>>n;
for(int i=;i<=n;i++) cin>>s[i];
sort(s+,s++n,cmp);
string ans;
for(int i=;i<=n;i++) ans=ans+s[i]; int flag=; for(int i=;i<ans.size();i++)
{
if(ans[i]!='')
{
flag = ;
for(int j=i;j<ans.size();j++) cout<<ans[j];
break;
}
} if(flag==) cout<<"";
cout<<endl;
return ;
}

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