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  1. #include <stdio.h>
  2. int factorial(int n) {
  3. 	int i,result;
  4. 	result=1;
  5. 	for(i=n;i>1;i--){
  6. 		result *= i;
  7. 	}
  8. 	return result;
  9. }
  10. int comb(int m,int k){
  11. 	int x;
  12. 	x=factorial(m)/(factorial(k)*factorial(m-k));
  13. 	return x;
  14. }
  15. int main(void) {
  16. 	int m,k;
  17. 	scanf("%d",&m);
  18. 	scanf("%d",&k);
  19. 	printf("%d個の中から%d個を取り出す組み合わせは%d通りです。",m,k,comb(m,k));
  20. 	return 0;
  21. }
  22.  
Success #stdin #stdout 0s 5288KB
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stdin
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10 2
stdout
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10個の中から2個を取り出す組み合わせは45通りです。
https://ideone.com/lXsMld
language:
C (gcc 8.3)
created:
134 days ago
visibility:
public

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