What is the problem of my code?[java]

  • 0
    public boolean isBalanced(TreeNode root) {
        if(root == null)
            return true;
        if(depth(root) != -1)
            return true;
        else return false;
    public int depth(TreeNode root) {
        if(root == null)
            return 0;
        int leftdepth = depth(root.left)+1;;
        int rightdepth = depth(root.right)+1;;
        if(leftdepth == -1 || rightdepth == -1 || (Math.abs(leftdepth - rightdepth) > 1))
            return -1;
            return Math.max(leftdepth,rightdepth);

    My general idea is to calculate the depth of every node. If any subtree is unbalanced, the tree is ubalanced. The test case :[1,2,2,3,null,null,3,4,null,null,4] failed, and I have no I idea how this tree is constructed. Would you tell me what goes wrong in my algorithm?

  • -1

    return Math.max(leftdepth,rightdepth) ,you should add 1, return Math.max(leftdepth,rightdepth)+1;

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