View Compilation Error

0_0_39699053_32429.cpp: In function 'int main()':
0_0_39699053_32429.cpp:42:26: error: 'lowbit' was not declared in this scope
   42 |                 if (i == lowbit (i)) cnt[i] = log2 (i);
      |                          ^~~~~~
0_0_39699053_32429.cpp:42:47: error: 'log2' was not declared in this scope
   42 |                 if (i == lowbit (i)) cnt[i] = log2 (i);
      |                                               ^~~~