Combination-raw

#include <stdio.h>
int N, Q;
int Num[201];
int D[11];
int M[11];
int flag[100];
int flag2[100];
int A[3];
int r = 2;
void print()
{
	int i;
	for (i = 0; i < r; i++)
		printf("%d ", A[i]);
	printf("\n");
}
void solve(int i, int state)
{
	int j;
	if (i == r) {
		print();
		return;
	}
	for (j = state; j < N; j++) {
		A[i] = j;
		solve(i + 1, j + 1);
	}
}
int main()
{
	/*freopen("input.txt", "r", stdin);
	int i, j;
	scanf("%d %d", &N, &Q);
	for (i = 0; i < N; i++) {
		scanf("%d", &Num[i]);
	}
	for (i = 0; i < Q; i++) {
		scanf("%d %d", &D[i], &M[i]);
	}
	*/
	scanf("%d", &N);
	solve(0, 0);
	return 0;
}