题解 100% AC

#include<iostream>
using namespace std;
int dx[4]={0,1,0,-1},dy[4]={1,0,-1,0};
int main() {
    int n,m,x,y;cin>>n>>m>>x>>y;
    for(int i=0;i<4;i++){
        if(x+dx[i]>0&&y+dy[i]>0&&x+dx[i]<=n&&y+dy[i]<=m) cout<<x+dx[i]<<" "<<y+dy[i]<<endl;
        else cout<<"NA"<<endl;
    }
	return 0;
}