不知道为什么，洛谷给的输出数据和我自己测试的输出数据有的能对上有的对不上，

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
int main()
{
    int n, s, sum = 0; // n: total number, s: total strength, sum: number of apples picked
    int a, b; // a + b represents the height of hands
    scanf("%d %d", &n, &s);
    scanf("%d %d", &a, &b);
    int* x;
    int i;
    x = (int*)malloc(n * sizeof(int));
    if (x == NULL) {
        return 1;
    }
    int* y;
    y = (int*)malloc(n * sizeof(int));
    if (y == NULL) {
        return 1;
    }
    for (i = 0; i < n; i++)
    {
        scanf("%d %d", &x[i], &y[i]);
    }
    for (i = 0; i < n; i++)
    {
        if (a + b >= x[i] && s>=y[i] ) 
  		{
            sum++;
            s = s - y[i];
   		  if (s < 0)
        {
            break;
        }
      }
    }
    printf("%d", sum);
    free(x);
    free(y);
    return 0;
}