Idiot-maker

摘要： https://oj.leetcode.com/problems/path-sum-ii/ Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum. F 阅读全文

摘要： https://oj.leetcode.com/problems/path-sum/ Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the va 阅读全文

摘要： https://oj.leetcode.com/problems/validate-binary-search-tree/Given a binary tree, determine if it is a valid binary search tree (BST).Assume a BST is ... 阅读全文

摘要： https://oj.leetcode.com/problems/binary-tree-level-order-traversal-ii/Given a binary tree, return thebottom-up level ordertraversal of its nodes' valu... 阅读全文

摘要： https://oj.leetcode.com/problems/binary-tree-level-order-traversal/Given a binary tree, return thelevel ordertraversal of its nodes' values. (ie, from... 阅读全文