foo.cc: In instantiation of 'int Treap<T, MAXN>::build(int*, int, int) [with T = int; int MAXN = 500005]':
foo.cc:135:26:   required from 'void Treap<T, MAXN>::insert(int, int*, int, int) [with T = int; int MAXN = 500005]'
foo.cc:187:17:   required from here
foo.cc:124:37: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  124 |                         int mid = l + r >> 1;
      |                                   ~~^~~

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