LeetCode: 451-Sort Characters By Frequency 解題紀錄
題目
Given a string s, sort it in decreasing order based on the frequency of the characters. The frequency of a character is the number of times it appears in the string.
C++
[C++] vector 中使用 push_back() 和 emplace_back() 的差別
今天在刷題的時候，看到一位分享自己解題思路的網友，他的程式碼中所有宣告的 vector 陣列，全部都使用 emplace_back()。那時候我可看不明白了，從我在大學上課開始寫時，老師都是教寫 push_back() 的啊？
LeetCode: 2225-Find Players With Zero or One Losses 解題紀錄
題目
You are given an integer array matches where matches[i] = [winneri, loseri] indicates that the player winneri defeated player loseri in a match.
LeetCode: 446-Arithmetic Slices II – Subsequence 解題紀錄
題目
Given an integer array nums, return the number of all the arithmetic subsequences of nums.
LeetCode: 2486-Append Characters to String to Make Subsequence 解題紀錄
題目
ou are given two strings s and t consisting of only lowercase English letters.
Return the minimum number of characters that need to be appended to the end of s so that t becomes a subsequence of s.
LeetCode: 2485-Find the Pivot Integer 解題紀錄
題目
Given a positive integer n, find the pivot integer x such that:
- The sum of all elements between
1andxinclusively equals the sum of all elements betweenxandninclusively.
LeetCode: 79-Word Search 解題紀錄
題目
Given an m x n grid of characters board and a string word, return true if word exists in the grid.
LeetCode: 1926-Nearest Exit from Entrance in Maze 解題紀錄
題目
You are given an m x n matrix maze (0-indexed) with empty cells (represented as '.') and walls (represented as '+'). You are also given the entrance of the maze, where entrance = [entrancerow, entrancecol] denotes the row and column of the cell you are initially standing at.