第五个有问题 其他的没问题 有没有大佬帮帮 求求了 5555

#include <iostream>
#include <cmath>
using namespace std;

class student {

public:
    int chinese;
    int math;
    int english;
    student() {
        chinese = 0;
        math = 0;
        english = 0;

}
    student(int a, int b, int c) {
        chinese = a;
        math = b;
        english = c;
    }
    void setstudent(int a, int b, int c) {
        chinese = a;
        math = b;
        english = c;
    }
    int sum() {
        return ((this->chinese) + (this->english) + (this->math));
    }
};
int main()
{

    int i;
    cin >> i;
    student* newstudent = new student();
    student studentlist[999] = {};
    for (int a = 0; a < i; a++) {
        int chinese,math,english;
        cin >> chinese;
        cin >> math;
        cin >> english;
        studentlist[a].setstudent(chinese, math, english);      
    }
    int count = 0;

    for (int a = 0; a < i-1 ; a++) {
        for (int b =a+1; b < i; b++) {
            bool turn = true;
            //cout << a<<endl;
            //cout << b << endl;
            //cout << studentlist[a].chinese << endl;
            //cout << studentlist[a].math << endl;
            //cout << studentlist[a].english << endl;
            //cout << studentlist[b].chinese << endl;
            //cout << studentlist[b].math << endl;
            //cout << studentlist[b].english << endl;
            if (abs(studentlist[a].chinese - studentlist[b].chinese) > 5) {
                turn = false;
            }
            if (abs(studentlist[a].math - studentlist[b].math) > 5) {
                turn = false;
            }
            if (abs(studentlist[a].english - studentlist[b].english) > 5) {
                turn = false;
            }
            if (abs(studentlist[a].sum() - studentlist[b].sum()) > 10) {
                turn = false;
            }
            if (turn) {
                count++;
            }
        }
    }
    cout << count;


}