【LeetCode】【222】【Count Complete Tree Nodes】
class TreeNode { int val; TreeNode left; TreeNode right; TreeNode(int x) { val = x; } } public int countNodes(TreeNode root) { if(root == null) return 0; int h = height(root); if(height(root.left ) == height(root.right)) return (h-1>0?1<<h-1:1) + countNodes(root.right); else return (h-2>0?1<<h-2:1) + countNodes(root.left); } public int height(TreeNode root){ return root == null?0:1+height(root.left); }
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【LeetCode】【222】【Count Complete Tree Nodes】
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