View Compilation Error

0_0_38684536_29604.cpp: In function 'int main()':
0_0_38684536_29604.cpp:219:30: error: 'C' was not declared in this scope
  219 |                 ans = (ans + C(cnt, 4) * C(cnt_i - 4, 2) + C(cnt, 4) * C(cnt_j - 4, 2)) % mod;
      |                              ^