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  1. #include<bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. long min(long a, long b) {
  6.     return a<b ? a : b;
  7. }
  8.  
  9. unsigned long long binomialCoeff(long n, long k) 
  10. { 
  11.     if(k==0) {
  12.         return 1;
  13.     }
  14.     if(n==k) {
  15.         return 1;
  16.     }
  17.     if(k==1) {
  18.         return (long long)n;
  19.     }
  20.     unsigned long long C[n + 1][k + 1]; 
  21.     long i, j;
  22.     for (i = 0; i <= n; i++) 
  23.     { 
  24.         for (j = 0; j <= min(i, k); j++) 
  25.         { 
  26.  
  27.             if (j == 0 || j == i) 
  28.                 C[i][j] = 1; 
  29.  
  30.             else
  31.                 C[i][j] = C[i - 1][j - 1] + 
  32.                           C[i - 1][j]; 
  33.         } 
  34.     } 
  35.  
  36.     return C[n][k]; 
  37. } 
  38.  
  39. int main() {
  40.     int t;
  41.     scanf("%d",&t);
  42.     while(t--) {
  43.         long n,k;
  44.         cin >> n >> k;
  45.         cout << binomialCoeff(n-1,k-1) << endl;
  46.     }
  47. 	return 0;
  48. }
Success #stdin #stdout 0s 4496KB
comments (?)
stdin 
2
10 10
30 7
stdout 
1
475020
https://ideone.com/j3wxQw
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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