foo.cc: In function ‘int mian()’:
foo.cc:12:39: error: ‘pow’ was not declared in this scope
   12 |         double result = round(dp[n] * pow(2, n) % 100007);
      |                                       ^~~
foo.cc:12:25: error: ‘round’ was not declared in this scope
   12 |         double result = round(dp[n] * pow(2, n) % 100007);
      |                         ^~~~~