原创 [Leetcode] Convert Sorted List to Binary Search Tree Solution
Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. Ideas: F
2020-06-16 05:02:46
原创 [LeetCode] Linked List Cycle II Solution
Given a linked list, return the node where the cycle begins, if there is no cycle, return null. Follow up: could you so
2020-06-16 05:02:46
原创 [LeetCode] Reverse Linked List II Solution
Reverse a linked list from position m to n, Do it in-place and in one-pass. For example: Given 1->2->3->4->5->NULL, m
2020-02-21 09:34:11
原创 [LeetCode] Remove Duplicates from Sorted Array II
Follow up for "Remove Duplicates". What if duplicates are allowed at most twice? For example, Given sorted array A=[1,
2020-02-21 09:34:11
原创 [LeetCode] 4Sum Solution
Given an array S of n integers, are there elements a, b, c and d in S such that a + b + c + d = target? Find all unique
2020-02-21 09:34:11
原创 [LeetCode] Remove Duplicates from Sorted Array
Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.
2020-02-21 09:34:11
原创 [LeetCode] 3Sum Solution
Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in t
2020-02-21 09:34:11
原创 [LeetCode] Linked List Cycle
Given a linked list, deter if it has cycle in it. Follow up: can you solve it without using extra space? Idea: use slo
2020-02-21 09:34:11
原创 【LeetCode】Linked List 類題目列表
明確了目標： (2015年1月1日前完成 leetcode). 我們就要有計劃，有安排，最終實現我們的目標。 LeetCode：共154題 時間： 11.2 to 12. 31 共計 29 + 31 = 60 天 平均154/6
2020-02-21 09:34:11
原创 [LeetCode] 計劃和安排 之二
2014-11-9 到 2014-11-15類別：【Two Pointers】https://oj.leetcode.com/tag/two-pointers/[2014-11-9][LeetCode] Valid Palindrome[
2020-02-21 09:34:11
原创 [LeetCode Solution] Merge k sorted Lists
Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. Idea: 1. we know how
2020-02-21 09:34:11
原创 [LeetCode] Two Sum
Given an array of integers, find two numbers such that they add up to a specific target number. The function twoSum sho
2020-02-21 09:34:11
原创 Catalan Number (卡特蘭數)
1. 什麼是卡特蘭數（Catalan Number）？ Catalan Number 是一組有規律的數列，由比利時叫什麼什麼卡特蘭的數學家的名字命名的。它是怎樣的一組數列呢？ 1， 2， 5， 14， 132， 429。。。。。。 2.
2020-02-21 09:34:11
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原创 [LeetCode] 3Sum Closest
Given an array of S of n integers, find three integers in S such that the sum is closest to a given number, target. Ret
2020-02-21 09:34:11
原创 [LeetCode] Valid Palindrome
Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. Note:Have
2020-02-21 09:34:11