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  1. #include <stdio.h>
  2.  
  3. int factorial(int n);
  4. int comb(int m, int k);
  5.  
  6. int main(void){
  7. 	int m, k;
  8. 	scanf("%d",&m);
  9. 	scanf("%d",&k);
  10. 	printf("%d個の中から%d個を取り出す組み合わせは、%d個です。\n",m,k,comb(m,k));
  11. 	return 0;
  12. }
  13.  
  14. int factorial(int n){
  15. 	int i, result = 1;
  16. 	for(i=n;i>1;i--){
  17. 		result *= i;
  18. 	}
  19. 	return result;
  20. }
  21.  
  22. int comb(int m, int k){
  23. 	return factorial(m)/(factorial(k) * factorial(m - k));
  24. }
  25.  
Success #stdin #stdout 0s 5276KB
comments (?)
stdin
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10 3
stdout
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10個の中から3個を取り出す組み合わせは、120個です。
https://ideone.com/hZzw2V
language:
C (gcc 8.3)
created:
6 days ago
visibility:
public

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