20分求调(悬赏关注)

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,s,a,b,c=0;
    cin>>n>>s>>a>>b;
    int j=a+b;
    int x[n],y[n];
    for(int i=0;i<n;i++){
        cin>>x[i]>>y[i];
        if(a+b>=x[i]&&b-y[i]>=0)
            c++;
    }
    cout<<c;
}