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  1. #include <stdio.h>
  2.  
  3.  
  4. int factorial(int n){
  5. 	int i,result;
  6. 	result=1;
  7. 	for(i=n;i>1;i--){
  8. 		result=result*i;
  9. 	}
  10. 		return result;
  11. }
  12. int comb(int m, int k){
  13. 	int ku;
  14. 	ku=factorial(m)/(factorial(k)*factorial(m-k));
  15. 	return ku;
  16. }
  17.  
  18.  
  19. int main(void) {
  20.  
  21. 	int m,k;
  22. 	int ku;
  23.  
  24. 	scanf("%d %d",&m,&k);
  25. 	ku = comb(m,k);
  26.  
  27. 	printf("%d通り",ku);
  28.  
  29. 	return 0;
  30. }
  31.  
Success #stdin #stdout 0s 5308KB
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120通り
https://ideone.com/FsAEXs
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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