PAT 1083 List Grades

#include <cstdio>
#include <cstdlib>

using namespace std;

class Stu {
    public:
        char name[12];
        char id[12];
};

int main() {
    int N = 0;
    // because all the grades are distinct & grade in range of [0, 100]
    // use simplified bucket sort here
    Stu* stu[101] = {0};
    int grade;
    scanf("%d", &N);
    for (int i=0; i<N; i++) {
        Stu* tmp = new Stu();
        scanf("%s%s%d", tmp->name, tmp->id, &grade);
        stu[grade] = tmp;
    }
    
    int lo, hi;
    scanf("%d%d", &lo, &hi);
    if (lo > hi) {
        int tmp = lo;
        lo = hi;
        hi = tmp;
    }
    bool has = false;
    for (int i=hi; i>=lo; i--) {
        if (stu[i] == NULL) continue;
        has = true;
        printf("%s %s\n", stu[i]->name, stu[i]->id);
    }
    if (!has) {
        printf("NONE");
    }
    return 0;
}