xj老师正版题解

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