Leetcode 255: Verify Preorder Sequence in Binary Search Tree
Question
Given an array of numbers, verify whether it is the correct preorder traversal sequence of a binary search tree.
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Leetcode 254: Factor Combinations
Question Numbers can be regarded as product of its factors. For example, 8 = 2 x 2 x 2; = 2 x 4. [Read More] -
Leetcode 253: Meeting Rooms II
Question Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), find the minimum number of conference rooms required. [Read More] -
Leetcode 252: Meeting Rooms
Question Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...] (si < ei), determine if a person could attend all meetings. [Read More] -
Leetcode 251: Flatten 2D Vector
Question Implement an iterator to flatten a 2d vector. [Read More] -
Leetcode 250: Count Univalue Subtrees
Question Given a binary tree, count the number of uni-value subtrees. [Read More] -
Leetcode 249: Group Shifted Strings
Question [Read More] -
Leetcode 247: Strobogrammatic Number II
Question A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). [Read More] -
Leetcode 246: Strobogrammatic Number
Question A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). [Read More] -
Leetcode 238: Product of Array Except Self
Question Given an array nums of n integers where n > 1, return an array output such that output[i] is equal to the product of all the elements of nums except nums[i]. [Read More] -
Leetcode 236: Lowest Common Ancestor of a Binary Tree
Question Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. [Read More] -
Leetcode 229: Majority Element II
Question Given an integer array of size n, find all elements that appear more than ⌊ n/3 ⌋ times. [Read More] -
Leetcode 234: Palindrome Linked List
Question Given a singly linked list, determine if it is a palindrome. [Read More] -
Leetcode 228: Summary Ranges
Question Given a sorted integer array without duplicates, return the summary of its ranges. [Read More] -
Leetcode 227: Basic Calculator II
Question Implement a basic calculator to evaluate a simple expression string. [Read More]