What's the problem with this Code?
The result is "fatal" on all the IARCS online judge.
By the way, what is "fatal"?
#include<iostream>#include<cstdio>#include<set>#include<string>#include<sstream>using namespace std;set<string> a;int n;int main(){cin>>n;do{string s;getline(cin,s);for(int i=0;i<s.size();i++){if(isalpha(s[i])) s[i]=tolower(s[i]);