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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define max3(a,b,c) max(max(a,b),c)
  4. #define min3(a,b,c) min(min(a,b),c)
  5. #define PI acos(-1.0)
  6. #define LL long long
  7. #define INF_MAX 2147483647
  8. #define INF_MIN -2147483647
  9. #define MX 1000005
  10. #define MOD 1000000007
  11. int main()
  12. {
  13.    //freopen("a.in", "r", stdin);
  14.     //freopen("a.out", "w", stdout);
  15.     LL n,r,temp1,temp2,res;
  16.     while(scanf("%lld%lld",&n,&r))
  17.     {
  18.         if(n==0 && r==0) break;
  19.         temp1=n;
  20.         temp2=r;
  21.         if(n-r<r) r=n-r;
  22.         res=1;
  23.         for(int i=1;i<=r;i++)
  24.         {
  25.             res=res*n;
  26.             res=res/i;
  27.             n--;
  28.         }
  29.         printf("%lld things taken %lld at a time is %lld exactly.\n",temp1,temp2,res);
  30.     }
  31. }
  32.  
Success #stdin #stdout 0s 3416KB
comments (?)
stdin
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100  6
      20  5
      18  6
       0  0
stdout
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100 things taken 6 at a time is 1192052400 exactly.
20 things taken 5 at a time is 15504 exactly.
18 things taken 6 at a time is 18564 exactly.
https://ideone.com/PgZ6Mu
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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