力扣算法题

在做CS106B课程作业时，有一个函数是计算第n个完美数，当时就觉得恶心。 经过百度后才知道有个科学家证明了如何快速识别一个数是否是完美数。

Given an array of integers nums which is sorted in ascending order, and an integer target, write a f

A company is planning to interview 2n people. Given the array costs where costs[i] = [aCosti, bCosti

You are given an array people where people[i] is the weight of the ith person, and an infinite numbe

The numeric value of a lowercase character is defined as its position (1-indexed) in the alphabet, s

You are given a string s. We want to partition the string into as many parts as possible so that eac

In a row of dominoes, tops[i] and bottoms[i] represent the top and bottom halves of the ith domino.

Design a stack-like data structure to push elements to the stack and pop the most frequent element f

Given a string s, remove duplicate letters so that every letter appears once and only once. You must

Medium Given a balanced parentheses string s, return the score of the string. The score of a balance

You are given two non-empty linked lists representing two non-negative integers. The digits are stor

Count All Valid Pickup and Delivery Options Hard Given n orders, each order consist in pickup and de

You are given an integer array nums. You want to maximize the number of points you get by performing

We stack glasses in a pyramid, where the first row has 1 glass, the second row has 2 glasses, and so

An integer array is called arithmetic if it consists of at least three elements and if the differenc

Given two strings s and t, return true if s is a subsequence of t , or false otherwise. A subsequenc

Given an integer n, return an array ans of length n + 1 such that for each i **(0 <= i <= n) , ans[i

Summary Ranges Easy You are given a sorted unique integer array nums. Return the smallest sorted lis

Given the root of a binary tree, return the maximum width of the given tree. The maximum width of a

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