Compiler feedback and the BLIS DGEMM We’re going to look at how to interact with the compiler to obtain the so that it vectorise a loop the way we want it to. As our starting point we will use a C...

You are given an array of integers nums, there is a sliding window of size k which is moving from the very left of the array to the very right. You can only see the k numbers in the window. Each ti...

You are given a string s consisting of lowercase English letters. A duplicate removal consists of choosing two adjacent and equal letters and removing them. We repeatedly make duplicate removals o...

You are given an array of strings tokens that represents an arithmetic expression in a Reverse Polish Notation. Evaluate the expression. Return an integer that represents the value of the expressi...

1.Introduction collections.deque（双端队列）是 Python 提供的一个 高效 的 双端队列，相比 list 在 头部操作（插入/删除） 速度更快，适用于 队列（queue） 和 栈（stack） 场景。 2.Use 2.1 导入 from collections import deque 2.2 创建deque # 创建一个空的 deque dq = ...

Given a string s containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[’ and ‘]’, determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type...

Implement a last-in-first-out (LIFO) stack using only two queues. The implemented stack should support all the functions of a normal stack (push, top, pop, and empty). Implement the MyStack class:...

Implement a first in first out (FIFO) queue using only two stacks. The implemented queue should support all the functions of a normal queue (push, peek, pop, and empty). Implement the MyQueue clas...

Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. Example 1: Input: haystack = “sadbutsad”, needle = ...

Given an input string s, reverse the order of the words. A word is defined as a sequence of non-space characters. The words in s will be separated by at least one space. Return a string of the wo...