测试样例过了，但是全WA

#include<iostream>  
#include<cmath>
using namespace std;  
struct Student{
	int score_1,score_2,score_3;
	int sum;
}stu[1005]; 
int main(){  
	
	int N;
	cin>>N;
	for(int i=0;i<N;i++){
		cin>>stu[i].score_1>>stu[i].score_2>>stu[i].score_3;
		stu[i].sum=stu[i].score_1+stu[i].score_2+stu[i].score_3;
	}
	int count=0;
	for(int i=0;i<N;i++){
		for(int j=i+1;j<N;j++){
			if((abs(stu[i].sum-stu[j].sum)<=10)&&(abs(stu[i].score_1-stu[j].score_1<=5))
			&&(abs(stu[i].score_2-stu[j].score_2<=5))&&(abs(stu[i].score_3-stu[j].score_3<=5))){
				count++;
			}
		}
	}
	cout<<count;
	return 0;  
}