LeetCode 70. Climbing Stairs
题目You 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
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LeetCode 140. Word Break II
题目Given a non-empty string s and a dictionary wordDict containing a list of non-empty words, add spaces in s to construct a sentence where each word i
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LeetCode 309. Best Time to Buy and Sell Stock with Cooldown
题目Say you have an array for which the i^th element is the price of a given stock on day i.
Design an algorithm to find the maximum profit. You may com
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LeetCode 621. Task Scheduler
题目You are given a char array representing tasks CPU need to do. It contains capital letters A to Z where each letter represents a different task. Task
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LeetCode 106. Construct Binary Tree from Inorder and Postorder Traversal
题目Given inorder and postorder traversal of a tree, construct the binary tree.
Note:
You may assume that duplicates do not exist in the tree.
For examp
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LeetCode 258. Add Digits
题目Given a non-negative integer num, repeatedly add all its digits until the result has only one digit.
Example:
1234Input: 38Output: 2 Explanation: Th
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LeetCode 154. Find Minimum in Rotated Sorted Array II
题目Suppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand.
(i.e., [0,1,2,4,5,6,7] might become [4,5,6,7,0,1,2]
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LeetCode 797. All Paths From Source to Target
题目Given a directed, acyclic graph of N nodes. Find all possible paths from node 0 to node N-1, and return them in any order.
The graph is given as fo
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LeetCode 260. Single Number III
题目Given an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two element
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LeetCode 103. Binary Tree Zigzag Level Order Traversal
题目Given a binary tree, return the zigzag level order traversal of its nodes’ values. (ie, from left to right, then right to left for the next level an
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