View Compilation Error

0_0_35719061_25169.cpp: In function 'void solve(long long int, long long int)':
0_0_35719061_25169.cpp:16:18: error: 'N' was not declared in this scope
  cout << ans * C[N - ((r - 1) * (k - 1) + r) + r + 1 - 1][r] % MOD << endl;
                  ^