原创 leetcode 12. Integer to Roman

1.題目 Given an integer, convert it to a roman numeral. Input is guaranteed to be within the range from 1 to 3999

2020-02-23 09:23:54

原创 leetcode 13. Roman to Integer

1.題目 Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 399

2020-02-23 09:23:54

原创 leetcode 16. 3Sum Closest

1.題目 Given an array S of n integers, find three integers in S such that the sum is closest to a given numbe

2020-02-23 09:23:44

原创 leetcode 17. Letter Combinations of a Phone Number

1.題目 Given a digit string, return all possible letter combinations that the number could represent. A mappin

2020-02-23 09:23:44 1

原创 leetcode 24. Swap Nodes in Pairs

1.題目 Given a linked list, swap every two adjacent nodes and return its head. For example, Given 1->

2020-02-23 09:23:44

原创 leetcode 21. Merge Two Sorted Lists

1.題目 Merge two sorted linked lists and return it as a new list. The new list should be made by splicing

2020-02-23 09:23:44

原创 leetcode 14. Longest Common Prefix

1.題目 Write a function to find the longest common prefix string amongst an array of strings. 找出所有字符串的最長公共前綴。

2020-02-23 09:23:44

原创 leetcode 28. Implement strStr()

1.題目 Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if

2020-02-23 09:23:44

原创 leetcode 18.4Sum

1.題目 Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = targ

2020-02-23 09:23:44 1

原创 leetcode 27. Remove Element

1.題目 Given an array and a value, remove all instances of that value in place and return the new leng

2020-02-23 09:23:44

原创 leetcode 31. Next Permutation

1.題目 Implement next permutation, which rearranges numbers into the lexicographically next greate

2020-02-23 09:23:44

原创 leetcode 25. Reverse Nodes in k-Group

1.題目 Given a linked list, reverse the nodes of a linked list k at a time and return its modified list.

2020-02-23 09:23:44

原创 leetcode 29. Divide Two Integers

1.題目 Divide two integers without using multiplication, division and mod operator. If it is overfl

2020-02-23 09:23:44

原创 Swift 3.0 學習筆記-1-基礎語法

Swift 3.0 學習筆記-1-基礎語法 標籤（空格分隔）： iOS Swift 聲明 swift3.0 學習筆記主要參考蘋果開發者官網The Swift Programming Language (Swift 3.1)教程 以及

2018-08-22 15:44:46

原创 Swift 3.0 學習筆記-4-控制流

Swift 3.0 學習筆記-4-控制流 標籤（空格分隔）： iOS Swift 前言： swift3.0 學習筆記主要參考蘋果開發者官網The Swift Programming Language (Swift 3.1)教程 以及

2018-08-22 15:44:46 3