21. Merge Two Sorted Lists
Question:
Merge two sorted linked lists and return it as a new sorted list. The new list should be made by splicing together the nodes of the first two lists.
[LeetCode Road] Length of Last Word - Solution/C++
8. Length of Last Word
Question:
Given a string s consists of some words separated by spaces, return the length of the last word in the string. If the last word does not exist, return 0.
A word is a maximal substring consisting of non-space characters only.
[LeetCode Road] Valid Parentheses - Solution/C++
20. Valid Parentheses
Question:
Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
An input string is valid if: 1. Open brackets must be closed by the same type of brackets. 2. Open brackets must be closed in the correct order.
[LeetCode Road] Longest Common Prefix - Solution/C++
14. Longest Common Prefix
Question:
Write a function to find the longest common prefix string amongst an array of strings.
If there is no common prefix, return an empty string "".
[LeetCode Road] Roman to Integer - Solution/C++
13. Roman to Integer
Question:
Roman numerals are represented by seven different symbols: \(I\), \(V\), \(X\), \(L\), \(C\), \(D\) and M.
Symbol Value
\(I\) 1
\(V\) 5
\(X\) 10
\(L\) 50
\(C\) 100
\(D\) 500
\(M\) 1000
Error message: Please tell me who you are. Run git config --global...
Command line: "hexo d" and you got error message: Please tell me who you are.
Full error message info:
Please tell me who you are.
Run
git config --global user.email “you@example.com”
git config --global user.name “Your Name”
to set your account’s default identity.
Omit --global to set the identity only in this repository.
error: src refspec HEAD does not match any.
error: failed to push some refs to(your ...github.io)
[LeetCode Road] Palindrome Number - Solution/C++
9. Palindrome Number
Question:
Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward.
Follow up: Could you solve it without converting the integer to a string?
[LeetCode Road] Reverse Integer - Solution/C++
7. Reverse Integer
Question:
Given a 32-bit signed integer, reverse digits of an integer.
Note: Assume we are dealing with an environment that could only store integers within the 32-bit signed integer range: [−2^31, 2^31 − 1]. For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows.
[LeetCode Road] Two Sum - Solution/C++
1. Two Sum
Question:
Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.
You may assume that each input would have exactly one solution, and you may not use the same element twice.
You can return the answer in any order.
How to understand recursive function - Tower of Hanoi
Tower of Hanoi
Let's realize how does tower of hanoi works and how to use recursive function to implement it!!!
The Tower of Hanoi is a mathematical game or puzzle, it's a classical problem during your CSIE studies.
First, the demonstration of process(3 disks and 3 rods) as below[1]: 