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  1. #include <iostream>
  2.  
  3. #define fromeq(x,y,i) for(LL i=x; i<=y; i++)
  4. #define from(x,y,i) for(LL i=x; i<y; i++)
  5. #define rfrom(x,y,i) for(LL i=x; i>=y; i--)
  6. #define D(x) cout << '>' << #x << ':' << x << endl;
  7. #define LL long long int
  8.  
  9. using namespace std;
  10.  
  11. LL C(LL n, LL r) {
  12.     LL v=1;
  13.     fromeq(n-r+1,n,i) {
  14.         v *= i;
  15.     }
  16.     fromeq(1,r,i) {
  17.         v /= i;
  18.     }
  19.     return v;
  20. }
  21.  
  22. int main() {
  23.     ios::sync_with_stdio(false);
  24.     LL cnt=0;
  25.     from(2,7,i) {
  26.         cnt += C(i+9,i);
  27.     }
  28.     cout<<cnt;
  29.     return 0;
  30. }
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Success #stdin #stdout 0s 16064KB
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7997
https://ideone.com/S6mtnS
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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