View Compilation Error

0_0_26039860_285.cpp: In function 'long long int dfs(int)':
0_0_26039860_285.cpp:15:47: error: 'pow' was not declared in this scope
  long long result = (long long)(pow(p[i], q[i])*dfs(i + 1) + pow(p[i], q[i] - 1)*(p[i] - 1)*q[i] * dfs(i + 1)) % 998244353;
                                               ^