题解 | #对称的二叉树#
对称的二叉树
https://www.nowcoder.com/practice/ff05d44dfdb04e1d83bdbdab320efbcb
/* function TreeNode(x) { this.val = x; this.left = null; this.right = null; } */ function isSymmetrical(pRoot) { // write code here if (pRoot === null) return true if (pRoot.left === null && pRoot.right === null) { return true } else { const nodeArray = [pRoot.left, pRoot.right] while (nodeArray.length > 0) { const head = nodeArray.shift() const tail = nodeArray.pop() if (head === null && tail === null) { continue } else if (head !== null && tail !== null && head.val === tail.val) { nodeArray.unshift(head.right) nodeArray.unshift(head.left) nodeArray.push(tail.left) nodeArray.push(tail.right) } else { return false } } return true } } module.exports = { isSymmetrical : isSymmetrical };