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  1. #include <stdio.h>
  2. int comb(int n, int k) 
  3. {
  4. 	int ans;
  5. 	if(n < k)
  6. 	{
  7. 		printf("error");
  8. 		return 0;
  9. 	}
  10. 	else if(k == 0 || k == n)
  11. 	{
  12. 		return 1;
  13. 	}
  14. 	else
  15. 	{
  16. 		ans = comb(n-1,k-1) + comb(n-1,k);
  17. 		return ans;
  18. 	}
  19. }
  20. int main(void) 
  21. {
  22. 	int n, k;
  23. 	scanf("%d", &n);
  24. 	scanf("%d", &k);
  25. 	printf("%d\n", comb(n, k));
  26. 	return 0;
  27. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
6 2
stdout 
15
https://ideone.com/l5xI0z
language:
C (gcc 8.3)
created:
10 days ago
visibility:
public

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