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.
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.
在正式開始撰寫、設計量子電腦的程式之前,我們有必要在 Python 中安裝 Qiskit 套件,因為 Qiskit 是基於 Python3.7 以後的版本進行開發的。
Read More »[Qiskit] 安裝筆記 - Installation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?
今天我在進行深度學習的資料前處理時,發現有個資料集中的標籤名稱特別的多樣,但是為了可讀性,我需要把這些資料分別使用不同的變數名稱來儲存,不能每次調用時都用 key 值來取值(其實是為了和之前在好的固定模版配合)。
Read More »[Python] 把 Dict 字典中的 key 值解開成變數You are given an integer array matches
where matches[i] = [winneri, loseri]
indicates that the player winneri
defeated player loseri
in a match.
Given an integer array nums
, return the number of all the arithmetic subsequences of nums
.
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
.
Given a positive integer n
, find the pivot integer x
such that:
1
and x
inclusively equals the sum of all elements between x
and n
inclusively.bisect 是一個 Python 的內建模組,其主要功能是維持一個排序後的 List 順序,讓該 List 在進行插入(insert)操作後無需重新排序整個 List。
Read More »[Python] 陣列二分演算法(Array bisection algorithm)bisect 筆記