/in/foo.cc:12:16: warning: overflow in conversion from 'long int' to 'int' changes value from '9223372036854775807' to '-1' [-Woverflow]
   12 | const int INF =INT_FAST32_MAX;
      |                ^~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:35:5: error: 'memset' was not declared in this scope
   35 |     memset(tree, -1, sizeof(tree));
      |     ^~~~~~
/in/foo.cc:6:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    5 | #include <cmath>
  +++ |+#include <cstring>
    6 | using namespace std;