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Majority Element

Majority ElementGiven an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times. You may assume that the array is non-empty and the major

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Excel Sheet Column Title

Excel Sheet Column TitleGiven a positive integer, return its corresponding column title as appear in an Excel sheet. For Example:12345671 -> A2 -> B3 -> C...26 -> Z27 -> AA28 -> AB

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Single Number

Single NumberGiven an array of integers, every element appears twice except for one. Find that single one. Note: Your algorithm should have a linear runtime complexity. Could you implement it without

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Min Stack

Min StackDesign a stack that supports push, pop, top, and retrieving the minimum element in constant time. push(x) – Push element x onto stack. pop() – Removes the element on top of the stack. top()

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Valid Palindrome

Valid PalindromeGiven a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example:12"A man, a plan, a canal: Panama" is a palindrome.

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Best Time to Buy and Sell Stock

Best Time to Buy and Sell StockSay you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to complete at most one transaction (ie, buy one and

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Pascal's Triangle II

Pascal’s Triangle IIGiven an index k, return the kth row of the Pascal’s triangle. For example, given k = 3,Return [1,3,3,1]. Note: Could you optimize your algorithm to use only O(k) extra space?

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Pascal's Triangle

Pascal’s TriangleGiven numRows, generate the first numRows of Pascal’s triangle. For example:Given numRows = 5, Return 1234567[ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1]] 提示 解題應用 A

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Path Sum

Path SumGiven a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. For example:Given the below binary tree an

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Minimum Depth of Binary Tree

Minimum Depth of Binary TreeGiven a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node. 提示 解題應用

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Balanced Binary Tree

Balanced Binary TreeGiven a binary tree, determine if it is height-balanced. For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees of ever

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Binary Tree Level Order Traversal II

Binary Tree Level Order Traversal IIGiven a binary tree, return the bottom-up level order traversal of its nodes’ values. (ie, from left to right, level by level from leaf to root). For example:Given

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Maximum Depth of Binary Tree

Maximum Depth of Binary TreeGiven a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. 提示 解題應用

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Binary Tree Level Order Traversal

Binary Tree Level Order TraversalGiven a binary tree, return the level order traversal of its nodes’ values. (ie, from left to right, level by level). For example:Given binary tree [3,9,20,null,null,

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Symmetric Tree

Symmetric TreeGiven a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this binary tree [1,2,2,3,4,4,3] is symmetric: 12345 1 / \ 2 2 / \ /

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Same Tree

Same TreeGiven two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. 提示

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Merge Sorted Array

Merge Sorted ArrayGGiven two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note: You may assume that nums1 has enough space (size that is greater or equal to m +

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Remove Duplicates from Sorted List

Remove Duplicates from Sorted ListGiven a sorted linked list, delete all duplicates such that each element appear only once. For example:12Given 1->1->2, return 1->2.Given 1->1->2->

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Climbing Stairs

Climbing StairsYou are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top? 提示 解題應用 Dyn

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Add Binary

Add BinaryGiven two binary strings, return their sum (also a binary string). For Example:123a = "11"b = "1"Return "100". 提示 解題應用 String 觀查規律 Math 觀查規律 Defaul

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Plus One

Plus OneGiven a non-negative number represented as an array of digits, plus one to the number. The digits are stored such that the most significant digit is at the head of the list. 提示 解題應用 Ar

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Length of Last Word

Length of Last WordGiven a string s consists of upper/lower-case alphabets and empty space characters ‘ ‘, return the length of last word in the string. If the last word does not exist, return 0. Not