/in/foo.cc: In function 'int main()':
/in/foo.cc:112:43: error: invalid conversion from 'void*' to 'int*' [-fpermissive]
  112 |                 valid_by_size[c] = realloc(valid_by_size[c],
      |                                    ~~~~~~~^~~~~~~~~~~~~~~~~~
      |                                           |
      |                                           void*
  113 |                     ++cnt_by_size[c]*sizeof(int));
      |                     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:117:50: error: invalid conversion from 'void*' to 'int*' [-fpermissive]
  117 |                     valid_containing[i] = realloc(valid_containing[i],
      |                                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
      |                                                  |
      |                                                  void*
  118 |                         ++cnt_contain[i]*sizeof(int));
      |                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~