为啥只有50分，蒟蒻求助!!!!

#include <iostream>
#include <cstdio>
#include <algorithm>
using namespace std;
int n;
int chinese[305],math[305],english[305];
struct node{
    int a,b,c;
}zong[305];
bool cmp(node a,node b){
    return a.a>b.a;
}
void cm(node a,node b){
    swap(a.a,b.a);
    swap(a.b,b.b);
    swap(a.c,b.c);
    return ;
}
int main(){
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>chinese[i]>>math[i]>>english[i];
        zong[i].c=i;
        zong[i].a=chinese[i]+math[i]+english[i];
        zong[i].b=chinese[i];
    }
    sort(zong+1,zong+n+1,cmp);
    for(int i=1;i<=n;i++){
        if(zong[i].a==zong[i+1].a){
            if(zong[i].b<zong[i+1].b){
                cm(zong[i],zong[i+1]);
//              swap(zong[i].c,zong[i+1].c);
            }
        }
    }
    for(int i=1;i<=5;i++){
        cout<<zong[i].c<<" "<<zong[i].a<<endl;
    }
    return 0;
}
//19   90 94 86
//101  86 98 86
//88   98 70 54