Different-names.cpp

/*

				Name: Mehul Chaturvedi
				IIT-Guwahati

*/

/*
	In Little Flowers Public School, there are many students with same first names. 
	You are given a task to find the students with same names. 
	You will be given a string comprising of all the names of students and you have 
	to tell the name and count of those students having same. If all the names are unique, print -1 instead.
	Note: We don't have to mention names whose frequency is 1.

*/

#include <bits/stdc++.h>

using namespace std;


int main( int argc , char ** argv )
{
	ios_base::sync_with_stdio(false) ; 
	cin.tie(NULL) ; 
	
	string names;
	getline(cin, names);
	//cout << names << '\n';

	stringstream iss(names);

	unordered_map<string, int> m1;
	string temp;

	while(iss>>temp){
		m1[temp]++;
	}

	unordered_map<string, int> :: iterator it=m1.begin();
	int count = 0;
	for (it; it != m1.end(); ++it)
	{
		if(it->second>1){
		cout << it->first<<" "<< it->second << '\n';
		count++;
		}
	}
	if (count == 0)
	{	
		cout << -1 << '\n';
	}

	return 0 ; 


}