Ch 4. Trees and Graphs/4.4_Check_Balanced.cpp... wrong wrapper function

[michaelzeng96]

int checkHeight(TreeNode* root) {
if (root == nullptr) {
return 0;
}
int leftHeight = checkHeight(root->left);
if (leftHeight == -1) {
return -1;
}
int rightHeight = checkHeight(root->right);
if (rightHeight == -1) {
return -1;
}

if (abs(leftHeight - rightHeight) > 1) {
	return -1;
}
else {
	return max(leftHeight, rightHeight) + 1;
}

}

//wrapper function should be checkHeight != -1 ... not checkHeight == -1
bool isBalanced(TreeNode* root) {
//return (checkHeight == -1);
return (checkHeight != -1);
}