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  1. /*
  2.  * Description: Finding Comb(n,k)
  3.  * Dynamic Programming Technique
  4.  *
  5.  * DP Based on recursive formula.
  6.  * C(n,k) = 1 if k == 0 or n == k
  7.  * C(n,k) = C(n-1,k-1) + C(n-1,k)
  8.  *
  9.  */
  10.  
  11. #include <bits/stdc++.h>
  12. #define LLI long long int
  13. #define SIZE 101
  14.  
  15. using namespace std;
  16.  
  17. LLI C[SIZE][SIZE], i, j, n, k;
  18.  
  19. int main(int argc, char const *argv[]) {
  20.  
  21.   n = 6;
  22.   k = 4;
  23.  
  24.   C[ 0 ][ 0 ] = 1;
  25.  
  26.   for(i = 1; i <= n; ++i) {
  27.  
  28.       for(j = 0; j <= i; ++j) {
  29.  
  30.         if(0 == j || i == j) C[i][j] = 1; 
  31.  
  32.         else
  33.  
  34.            C[i][j] = C[i-1][j-1] + C[i-1][j];
  35.  
  36.       }
  37.   }
  38.  
  39.   for(i = 0; i <= n; ++i) {
  40.  
  41.       for(j = 0; j <= i; ++j) {
  42.  
  43.         cout<<C[i][j]<<" ";
  44.       }
  45.       cout<<endl;
  46.   }
  47.  
  48.   cout<<C[n][k];
  49.  
  50.   return 0;
  51. }
  52.  
Success #stdin #stdout 0.01s 5548KB
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stdin
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Standard input is empty
stdout
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1 
1 1 
1 2 1 
1 3 3 1 
1 4 6 4 1 
1 5 10 10 5 1 
1 6 15 20 15 6 1 
15
https://ideone.com/ZYjGlM
Finding C(n,k)
language:
C++ (gcc 8.3)
created:
296 days ago
visibility:
secret

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