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- #include <bits/stdc++.h>
-
- using namespace std ;
-
- long long c[200][20000] ;
-
- main()
- {
- freopen("combination.in","r",stdin) ;
- freopen("combination.out","w",stdout) ;
- int n , k ;
- cin >> n >> k;
- for(int i = 0 ; i <= n ; ++i)
- {
- c[i][0] = 1 ; c[i][i] = 1 ;
- for(int j = 1 ; j < i ; ++j)
- c[i][j] = c[i-1][j-1]+c[i-1][j] ;
- }
- cout << c[n][k] ;
- }
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