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  1. #include <stdio.h>
  2.  
  3. int comb(int n, int r){
  4. 	int i, j=0, ans=1;
  5. 	for(i=0;i<r;i++){
  6. 		j=n-i;
  7. 		ans=ans*j;
  8. 	}
  9. 	for(i=0;i<r;i++){
  10. 		j=r-i;
  11. 		ans=ans/j;
  12. 	}
  13. 	return ans;
  14. }
  15. int main(void) {
  16. 	printf("%d\n", comb(5,2));
  17. 	printf("%d\n", comb(6,3));
  18. 	printf("%d\n", comb(7,4));
  19.  
  20. 	return 0;
  21. }
  22.  
Success #stdin #stdout 0s 5312KB
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https://ideone.com/h9XFpl
2-1
language:
C (gcc 8.3)
created:
9 days ago
visibility:
public

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