Maps-STL Hackerrank Solution C++ For Explanation Watch Video:: Sample Input 7 1 Jesse 20 1 Jess 12 1 Jess 18 3 Jess 3 Jesse 2 Jess 3 Jess Sample Output 30 20 0 Code: #include < cmath > #include < cstdio > #include < vector > #include < iostream > #include < set > #include < map > #include < algorithm > using namespace std; int main() { /* Enter your code here. Read input from STDIN. Print output to STDOUT */ int q; cin>>q; map<string, int >m; int type; string name; for ( int i= 0 ;i<q;i++){ cin>>type>>name; if (type== 1 ){ int mark; cin>>mark; m[name] += mark; } else if (type== 2 ){ m.erase(name); } else if (type== 3 ){ cout<<m[name]<< "\n" ; } } return 0 ; }