Solution of 'Maps-STL' (Hackerrank)

So, here's my solution of the question- Maps-STL of Hackerrank. If you guys have any suggestions, do comment. Thank you and Happy coding.

link: https://www.hackerrank.com/challenges/cpp-maps/problem

#include <cstdio>
 #include <cmath>
#include <vector>
#include <iostream>
#include <set>
#include <map>
#include <algorithm>
using namespace std;


int main()
{
    int q;
    cin>>q;
    int a[q];
    map<string,int> mark;
    for(int i=0;i<q;i++){
        cin>>a[i];
        if(a[i]==1){
            string p;
            int k;
            cin>>p>>k;
            mark[p]+=k;
        }
        else if(a[i]==2){
            string p;
            cin>>p;
            mark[p]=0;
        }
        else if(a[i]==3){
            string p;
            cin>>p;
            cout<<mark[p]<<'\n';
        }
    } 
}

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