[Chatbot] 微信訊息的 Reply 與 Push

微信 vs. WeChat

[.NET] new 與 override 關鍵字的差異

當不能覆寫 (override) 方法

[LeetCode] #5 Longest Palindromic Substring

Problem

Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000.

Example 1:

Input: "babad"
Output: "bab"
Note…

[LeetCode] #4 Median of Two Sorted Arrays

Problem

There are two sorted arrays nums1 and nums2 of size m and n respectively.

Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)).

[LeetCode] #15 3Sum

Problem

Given an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero.

Note:

[LeetCode] #11 Container With Most Water

Problem

[LeetCode] #3 Longest Substring Without Repeating Characters

Problem

Given a string, find the length of the longest substring without repeating characters.

Example 1:

Input: "abcabcbb"
Output: 3…

[LeetCode] #1 Two Sum

Problem

Given an array of integers, return indices of the two numbers such that they add up to a specific target.

You may assume that each input would have exactly one solution, and you may not use the same element twice.

[LeetCode] #2 Add Two Numbers

Problem

You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.