message: Update binary-tree-coloring-game.cpp
diff: @@ -29,8 +29,7 @@ private:
  const auto& left = count(root->left, x, left_right);
  const auto& right = count(root->right, x, left_right);
  if (root->val == x) {
  - left_right->first = left;
  - left_right->second = right;
  + *left_right = make_pair(left, right);
  }
  return left + right + 1;
  }
  