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  1. #include<stdio.h>
  2.  
  3. int combination (int n,int r){
  4.     int bunshi=1;
  5.     int bunbo=1;
  6.     for(int i=r;i>=1;i--){
  7.         bunshi=bunshi*i;
  8.     }
  9.     for(int i=0;i<r;i++){
  10.         bunbo=bunbo*(n-i);
  11.     }
  12.     return bunbo/bunshi;
  13. }
  14. int main(){
  15.     printf("%d",combination(5,2));
  16.     printf("%d",combination(6,3));
  17.     printf("%d",combination(7,4));
  18. }
  19.  
  20.  
Success #stdin #stdout 0s 5320KB
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Standard input is empty
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102035
https://ideone.com/PspmeC
language:
C (gcc 8.3)
created:
11 hours ago
visibility:
public

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