B2100

#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,a,b;
	cin >> n >> a >> b;
	for(int i=1;i<=n;i++){
		cout << "(" << a << "," << i << ") ";
	}
	cout << endl;
	for(int i=1;i<=n;i++){
		cout << "(" << i << "," << b << ") ";
	}
	int a1=a,b1=b,t=min(a,b)-1;
	cout << endl;
	a1-=t,b1-=t;
	for(int i=a1,j=b1;i<=n&&j<=n;j++,i++){
		cout << "(" << i << "," << j << ") ";
	}
	cout << endl;
	t=a+b;
	b=1;
	a=t-b;
	for(int i=a,j=b;i>=1&&j<=n;i--,j++){
		cout << "(" << i << "," << j << ") ";
	}
	return 0;
}

求助