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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. long long int factorial(long long int a)
  4. {
  5.     long long int ans = 1;
  6.     if(a == 0 || a == 1)
  7.         return 1;
  8.     else
  9.     {
  10.         for(int i=2; i<=a; i++)
  11.         {
  12.             ans=(ans*i)%1000000007;
  13.         }
  14.         return ans;
  15.     }
  16. }
  17. int main()
  18. {
  19.     int t;
  20.     cin>>t;
  21.     while(t--)
  22.     {
  23.         long long int n,m,ans;
  24.         cin>>n>>m;
  25.         n=n%1000000007;
  26.         m=m%1000000007;
  27.         ans = factorial(n+m-1)/(factorial(n)*factorial(m-1))%1000000007;
  28.         cout<<ans<<endl;
  29.  
  30.     }
  31.     return 0;
  32. }
  33.  
Success #stdin #stdout 0s 4520KB
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https://ideone.com/KM9Abi
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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