View Compilation Error

0_0_39755770_27096.cpp: In function 'int lca(int, int)':
0_0_39755770_27096.cpp:50:40: error: 'pow' was not declared in this scope
   50 |             while (fa[y][step] == 0 || pow(2, step) > tmp)
      |                                        ^~~
0_0_39755770_27096.cpp:54:20: error: 'pow' was not declared in this scope
   54 |             tmp -= pow(2, step);
      |                    ^~~