[leetcode]669. Trim a Binary Search Tree尋找範圍內的二叉搜索樹
根據BST的特點,如果小於L就判斷右子樹,如果大於R就判斷左子樹
遞歸地建立樹
public TreeNode trimBST(TreeNode root, int L, int R) { if (root==null) return null; if (root.val<L) return trimBST(root.right,L,R); if (root.val>R) return trimBST(root.left,L,R); TreeNode res = new TreeNode(root.val); res.left= trimBST(root.left,L,R); res.right = trimBST(root.right,L,R); return res; }
[leetcode]669. Trim a Binary Search Tree尋找範圍內的二叉搜索樹
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