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  1. // Level 3
  2. #include <stdio.h>
  3.  
  4. int combi(int n, int r)
  5. {
  6.     int i, s = 1;
  7.     for (i = n; i >= r + 1; i--) {
  8.         s *= i;
  9.     }
  10.     for (i = n - r; i >= 2; i--) {
  11.         s /= i;
  12.     }
  13.     return s;
  14. }
  15.  
  16. int main()
  17. {
  18.     int n, r;
  19.  
  20.     for (n = 0; n <= 5; n++) {
  21.         for (r = 0; r <= n; r++) {
  22.             printf("%dC%d= %-3d", n, r, combi(n, r));
  23.         }
  24.         printf("\n");
  25.     }
  26.     return 0;
  27. }
  28.  
Success #stdin #stdout 0.02s 1676KB
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stdin
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Standard input is empty
stdout
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0C0= 1  
1C0= 1  1C1= 1  
2C0= 1  2C1= 2  2C2= 1  
3C0= 1  3C1= 3  3C2= 3  3C3= 1  
4C0= 1  4C1= 4  4C2= 6  4C3= 4  4C4= 1  
5C0= 1  5C1= 5  5C2= 10 5C3= 10 5C4= 5  5C5= 1
https://ideone.com/Xdjq1q
language:
C (gcc 8.3)
created:
11 years ago
visibility:
secret

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