代码：

#include<bits/stdc++.h>
using namespace std;
int main()
{
	long long n,m,q,p;
	cin>>m>>n>>p>>q;
	if(q>=m||p>=n)
	{
		if(q!=m+1)
			cout<<"Segmentation fault."<<endl;
		else
			cout<<"Program ends with return value 0."<<endl;
	}
	else
	{
		cout<<"Program ends with return value 0."<<endl;
	}
	return 0;
}

哪里错了啊