/in/foo.cc: In function 'int step2()':
/in/foo.cc:20:25: warning: integer overflow in expression of type 'int' results in '2147483647' [-Woverflow]
   20 |     int ans = (1 << 31) - 1;
      |               ~~~~~~~~~~^~~
In file included from /usr/include/c++/12/algorithm:61,
                 from /in/foo.cc:5:
In function 'void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = int*; _Compare = __gnu_cxx::__ops::_Iter_less_iter]',
    inlined from 'void std::__final_insertion_sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = int*; _Compare = __gnu_cxx::__ops::_Iter_less_iter]' at /usr/include/c++/12/bits/stl_algo.h:1844:5,
    inlined from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = int*; _Compare = __gnu_cxx::__ops::_Iter_less_iter]' at /usr/include/c++/12/bits/stl_algo.h:1940:31,
    inlined from 'void std::__sort(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = int*; _Compare = __gnu_cxx::__ops::_Iter_less_iter]' at /usr/include/c++/12/bits/stl_algo.h:1932:5,
    inlined from 'void std::sort(_RAIter, _RAIter) [with _RAIter = int*]' at /usr/include/c++/12/bits/stl_algo.h:4820:18,
    inlined from 'int main()' at /in/foo.cc:43:13:
/usr/include/c++/12/bits/stl_algo.h:1849:32: warning: array subscript 17 is outside array bounds of 'int [15]' [-Warray-bounds]
 1849 |           std::__insertion_sort(__first, __first + int(_S_threshold), __comp);
      |           ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:7:5: note: at offset 68 into object 'a' of size 60
    7 | int a[15];
      |     ^