40分求tiao!!!闭关

#include<bits/stdc++.h>
using namespace std;
#define int long long
int n,m,sx,sy;
pair<int,int> a[1100][1100];
signed main(){
	ios::sync_with_stdio(false);
	cin.tie(0);cout.tie(0);
	cin>>n>>m>>sx>>sy;
	for(int i=1;i<=n;i++){
		for(int j=1;j<=m;j++){
			cin>>a[i][j].first>>a[i][j].second;
		}
	}
	
    pair<int,int> b;
    b.first=sx,b.second=sy;
	while(b.first&&b.second){
		cout<<b.first<<" "<<b.second<<"\n";
        int x=b.first,y=b.second;
        b=a[x][y];
	}
    return 0;
}