題目: A message containing letters from A-Z is being encoded to numbers using the following mapping way: 'A' -> 1
'B' -> 2
...
'Z' -> 26 Beyond that, now the encoded string can also contain the character ‘*’, whic
Sort a linked list using insertion sort. 鏈表的插入排序,其實有2種特殊情況: 1、插入的值插入到已排序的末尾。 leetcode并查集,2、插入的值插入到已排序的最前端。 主要設置了3個指針。 1、pStart是已排序鏈表的開始位置。 2、pInsert是待插入的位置。 LE
原題鏈接在這里:https://leetcode.com/problems/word-ladder/ leetcode70。題目: Given two words (beginWord?and?endWord), and a dictionary's word list, find the length of shortest transformation sequence from?beginWord?to?endWord, such that:
題目連接 https://leetcode.com/problems/course-schedule-ii/?? Course Schedule II Description There are a total of n courses you have to take, labeled from 0 to n - 1. leetcode 課程表?Some courses may have prerequisites, for example to take course 0 you ha
Write a program to find the node at which the intersection of two singly linked lists begins. For example, the following two linked lists: A: a1 → a2 ↘ c1 → c2 → c3 ↗ B: b1 → b2 → b3 begin to intersect at node c1. /*** Definition for singly-linked
原題鏈接在這里:https://leetcode.com/problems/remove-k-digits/description/ 題目: Given a non-negative integer?num?represented as a string, remove?k?digits from the number so that the new number is the smallest possible. Note: The length of?nu
Intersection of Two Linked Lists: Write a program to find the node at which the intersection of two singly linked lists begins. For example, the following two linked lists: A: a1 → a2↘c1 → c2 → c3↗ B: b1 → b2 → b3 leetcode121,begin to intersect at
傳送門 Description Given an integer (signed 32 bits), write a function to check whether it is a power of 4. Example:Given num = 16, return true. Given num = 5, return false. Follow up: Could you solve it without loops/recursion? 思路 題意:不