4C - Registration System - CodeForces Solution

data structures hashing implementation *1300

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Python Code: 

d={}
for _ in range(int(input())):
    s=input()
    if s in d:
        d[s]+=1 
        print(s+str(d[s]))
    else:
        d[s]=0
        print("OK")

C++ Code: 

#include <bits/stdc++.h>

using namespace std;

map <string, int> m;

int n;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin >> n;
    cin.ignore();
    for (int i = 1; i <= n; i++)
    {
        string s;
        cin >> s;
        if (m[s] == 0) cout << "OK" << "\n";
        else cout << s << m[s] << "\n";
        m[s]++;
    }
    return 0;
}


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