Codeforces Round #339 (Div. 2) B. Gena's Code

#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
string s;
string num,ans;
int main()
{
int n;
ans="1";
long long mx=0;
int j;
cin>>n;
for(int i=0;i<n;i++){
s.clear();
cin>>s;
//cout<<s<<endl;
num.clear();
if(s=="0"){
ans="0";
}
if(ans=="0") continue;
j=s.size()-1;
while(j>=0&&s[j]=='0'){
mx++;
j--;
}
for(int k=0;k<=j;k++)
num+=s[k];
// cout<<num<<endl;
if(num>"1"){
ans=num;
}
}
cout<<ans;
if(ans!="0"){
// cout<<mx<<endl;
while(mx>0){
cout<<"0";
mx--;
}

}
cout<<endl;
}