NEW mickey 99NEW mini 88MAXAVERAGEDELETE winnieQUITSample Output
A new recordA new record99 1mickey93.50
no such record
#include <iostream>#include <cstdio>#include <cmath>#include <queue>#include <stack>#include <map>#include <algorithm>#include <vector>#include <string>#include <cstring>#include <sstream>#define INF 100000000using namespace std;map<string,int> M;double sum;int main(){    string s;    map<string,int>::iterator i;    while(cin>>s)    {        if(s=="QUIT")        {            return 0;        }        else if(s=="NEW")        {            string name;            cin>>name;            int grade;            cin>>grade;            i=M.find(name);            if(i==M.end())            {                M[name]=grade;                printf("A new record/n");                sum+=grade;            }            else            {                printf("update succeed/n");                sum-=M[name];                sum+=grade;                M[name]=grade;            }        }        else if(s=="AVERAGE")        {            if(M.size()==0)            {                printf("0.00/n");            }            else            {                double ave=sum*1.0/M.size();                printf("%.2f/n",ave);            }        }        else if(s=="MAX")        {            if(M.size()==0)            {                printf("0 0/n");            }            else            {                map<string,int>::iterator it;                int maxx=M.begin()->second;                for(it=M.begin();it!=M.end();it++)                {                    if(it->second>maxx) maxx=it->second;                }                vector<string> b;                b.clear();                for(it=M.begin();it!=M.end();it++)                {                    if(it->second==maxx)                    {                        b.push_back(it->first);                    }                }                sort(b.begin(),b.end());                printf("%d %d/n",maxx,b.size());                for(int i=0;i<b.size();i++)                {                    cout<<b[i]<<endl;                }            }        }        else if(s=="DELETE")        {            string name;            cin>>name;            i=M.find(name);            if(i==M.end())            {                printf("no such record/n");            }            else            {                printf("delete succeed/n");                sum-=M[name];                M[name]=0;                map<string,int>::iterator it;                M.erase(i);            }        }    }    return 0;}