#### 1. cmp内的if是!=
##### 求关
```c
#include <bits/stdc++.h>
using namespace std;
struct student{
int x;
double u;
double s;
double y;
double sum;
}a[305];
bool cmp(student a,student b){
if(a.sum!=b.sum){
return a.sum>b.sum;
}
if(a.u!=b.u){
return a.u>b.u;
}
return a.x<b.x;
}
int main() {
int n;
cin>>n;
for(int i=0;i<n;i++){
cin>>a[i].u;
cin>>a[i].s;
cin>>a[i].y;
a[i].x=i+1;
a[i].sum=a[i].u+a[i].s+a[i].y;
}
sort(a,a+n,cmp);
for(int i=0;i<5;i++){
cout<<a[i].x<<" "<<a[i].sum<<endl;
}
return 0;
}
```
by LeoYangcz @ 2023-12-23 17:09:11