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  1. #include <stdio.h>
  2.  
  3. int func(int n,int r){
  4. 	int sum=1;
  5. 	printf("%d %d\n",n,r);
  6. 	if(n>r){
  7. 		sum=n*func(n-1,r);
  8. 	}
  9. 	return sum;
  10. }
  11.  
  12. int func1(int n,int r){
  13. 	return func(n,n-r)/func(r,1);
  14. }
  15.  
  16. int main(void) {
  17. 	int n,r;
  18. 	scanf("%d",&n);
  19. 	scanf("%d",&r);
  20. 	printf("%dC%d=%d",n,r,func1(n,r));
  21. 	return 0;
  22. }
  23.  
Success #stdin #stdout 0s 5312KB
comments (?)
stdin
copy 
7
4
stdout
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7 3
6 3
5 3
4 3
3 3
4 1
3 1
2 1
1 1
7C4=35
https://ideone.com/pg7iIG
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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