注意要保留两位小数诶

#include<bits/stdc++.h>
using namespace std;
struct stu{
    string name;
    int id;
    int ch;
    int math;
};
int main()
{
	int n,m;
    cin>>n>>m;
    stu a[n];
    for(int i=0;i<n;i++){
        cin>>a[i].name>>a[i].id>>a[i].ch>>a[i].math;
    }
    string action;
    int t=1;
    while(t<=m){
        cin>>action;
        if(action == "name"){
            string x;
            cin>>x;
            for(int i=0;i<n;i++){
                if(a[i].name == x){
                    cout<<a[i].ch<<" "<<a[i].math<<endl;
                }
            }
        }else if(action == "number"){
            int y;
            cin>>y;
            for(int i=0;i<n;i++){
                if(a[i].id == y){
                    double re;
                    re = (a[i].ch+a[i].math)/2.00;
                    cout<<fixed<<setprecision(2)<<re<<endl;
                }
            }
        }
        t++;
    }    
	return 0;
}