CF 402C - Searching for Graph

好奇怪的题目...

#include<stdio.h>

int main(){
	int tt;
	scanf("%d",&tt);
	while(tt--){
		int n,p;
		scanf("%d%d",&n,&p);
		int key=2*n+p;
		for(int i=1;i<=n&&key;i++)
			for(int j=i+1;j<=n&&key;j++){
				printf("%d %d\n",i,j);
				key--;
			}
	}
	return 0;
}