只A了第一和第四个点，求调

RT,求调

 #include<bits/stdc++.h>
using namespace std;
struct node{int x,y;}a[50000];
int cmp(node a1,node b1)
{
    if(a1.y<=b1.y)
        return a1.y<b1.y;
    return a1.y>b1.y;
}
int main()
{
    int n,s;scanf("%d%d",&n,&s);int num,ans;scanf("%d%d",&num,&ans); 
    int m=num+ans;
    int x=0 ;
    for(int i=1;i<=n;i++)
        scanf("%d%d",&a[i].x,&a[i].y);
    sort(a+1,a+1+n,cmp);
    for(int i=1;i<=n;i++)
    {
        if(a[i].x>m||m==0)
            break;
        if(a[i].y<=s&&a[i].x<=m)
        {
            s-=a[i].y;
            x++;
        }
    }

    printf("%d",x);
    return 0;
}