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  1. #include <stdio.h>
  2.  
  3. int func(int n,int r){
  4. 	int i,sum=1;
  5. 	for(i=r+1;i<=n;i++){
  6. 		sum=sum*i/(i-r);
  7. 	}
  8. 	return sum;
  9. }
  10.  
  11. int main(void) {
  12. 	int n,r;
  13. 	scanf("%d",&n);
  14. 	scanf("%d",&r);
  15. 	printf("%dC%d=%d",n,r,func(n,r));
  16. 	return 0;
  17. }
Success #stdin #stdout 0s 5328KB
comments (?)
stdin
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7
4
stdout
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7C4=35
https://ideone.com/5DzcA8
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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