我有两种

第一种

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,m,x,y;
	cin>>n>>m>>x>>y;
	int nx,ny;
	//右 
	nx=x;
	ny=y+1;
	if(nx>=1&&nx<=n&&ny>=1&&ny<=m){
		cout<<nx<<" "<<ny<<" "<<endl;
	}else{
		cout<<"NA"<<endl;
	}
	//下 
	nx=x+1;
	ny=y;
	if(nx>=1&&nx<=n&&ny>=1&&ny<=m){
		cout<<nx<<" "<<ny<<" "<<endl;
	}else{
		cout<<"NA"<<endl;
	}
	//左 
	nx=x;
	ny=y-1;
	if(nx>=1&&nx<=n&&ny>=1&&ny<=m){
		cout<<nx<<" "<<ny<<" "<<endl;
	}else{
		cout<<"NA"<<endl;
	}
	//上 
	nx=x-1;
	ny=y;
	if(nx>=1&&nx<=n&&ny>=1&&ny<=m){
		cout<<nx<<" "<<ny<<" "<<endl;
	}else{
		cout<<"NA"<<endl;
	}
    return 0;
}

第二种

#include<bits/stdc++.h>
using namespace std;
int main(){
	//初升的东曦 
	int dx[4]={0,1,0,-1};
	int dy[4]={1,0,-1,0}; 
	int n,m,x,y;
	cin>>n>>m>>x>>y;
	int nx,ny;
	for(int i=0;i<4;i++){
		nx=x+dx[i];
		ny=y+dy[i];
		if(nx>=1&&nx<=n&&ny>=1&&ny<=m){
			cout<<nx<<" "<<ny<<" "<<endl;
		}else{
			cout<<"NA"<<endl;
		}
	}
    return 0;
}