Codeforces Round #778 (Div. 1 + Div. 2, based on Technocup 2022 Final Round) 1654B. Prefix Removals Solution

Problem Link :  https://codeforces.com/contest/1654/problem/B 

Solution in C++:

///La ilaha illellahu muhammadur rasulullah

///******Bismillahir-Rahmanir-Rahim******///

///Abul Hasnat  Tonmoy

///Department of CSE,23rd batch

///Islamic University,Bangladesh

#include <bits/stdc++.h>

using namespace std;

int main()

{

    long long n,t,i,r,a;

    cin>>t;

    while(t--)

    {

        string s;

        cin>>s;

        map<char,int>mp;

        for(i=0; i<s.size(); i++)

        {

            mp[s[i]]++;

        }

        for(i=0; i<s.size(); i++)

        {

            if(mp[s[i]]>1)

            {

                mp[s[i]]--;

            }

            else

                break;

        }

        s.erase(0,i);

        cout<<s<<endl;

    }

}