Orz！而师份时身妈请框？

#include<bits/stdc++.h>

using namespace std;

const int NR = 5500;

int main () {
    int n;//how many apple
    int s;//tao's power
    int a;//how long is chair
    int b;//how long is arm
    int x[NR];//how long is each apple
    int y[NR];//each apple's power
    int ans = 0;//how many apple in standard
    scanf("%d%d%d%d", &n, &s, &a, &b);
    for (int i = 1; i <= n; i++)
        scanf("%d%d", &x[i], &y[i]);
    for (int i = 1; i <= n; i++) 
        if (s >= y[i] && x[i] <= a + b) {
            ans++;
            s -= y[i];
    }
    printf("%d", ans);
    return 0;
}

dalao！秋祝！QAQ！