foo.cc:6:20: error: ‘INT32_MAX’ was not declared in this scope
    6 | const int MAXINT = INT32_MAX / 4;
      |                    ^~~~~~~~~
foo.cc:5:1: note: ‘INT32_MAX’ is defined in header ‘<cstdint>’; this is probably fixable by adding ‘#include <cstdint>’
    4 | #include <algorithm>
  +++ |+#include <cstdint>
    5 | using namespace std;