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#include<cmath>#include<cstdio>#include<vector>#include<iostream>#include<set>#include<map>#include<algorithm>usingnamespacestd;intmain(){/* Enter your code here. Read input from STDIN. Print output to STDOUT */intq;cin>>q;map<string,int>m;inttype;stringx;inty;while(q--){cin>>type;if(type==1){cin>>x>>y;m[x]+=y;}elseif(type==2){cin>>x;m.erase(x);}elseif(type==3){cin>>x;map<string,int>::iteratoritr=m.find(x);if(itr==m.end())cout<<0<<endl;elsecout<<m[x]<<endl;}}return0;}
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Maps-STL
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Here's my solution:-