Distinct Subsequences Given a string S and a string T, count the number of distinct subsequences of T in S. A …

写在前面：看到很多程序员朋友都在刷LeetCode,刚好最近在学习swift以及数据结构算法，所以用swift刷LeetCode应该是个很好的练习方式。自己会在playground上编写代码及测试，并上传github持续…

  Write a SQL query to get the nth highest salary from the Employee table. +----+----…

  Assume you have an array of length n initialized with all 0‘s and are given k update operations. …

  Given two strings s1, s2, find the lowest ASCII sum of deleted characters to make two strings equa…

  A virus is spreading rapidly, and your task is to quarantine the infected area by installing walls. The…

题目： Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C …

本文首发于我的个人博客：尾尾部落 题目描述 输入一个正整数数组，把数组里所有数字拼接起来排成一个数，打印能拼接出的所有数字中最小的一个。例如输入数组{3，32，321}，则打印出这三个数字能排成的最小数字为321323。…

    今天听室友说去京东面试，面试官出了一道算法题，说是让编程实现将字符串转成整形，室友大意了，跪在了算法上。故为室友写下了此文，希望能帮到同样在找工作的小伙伴们。 题目大意： …

Given a sorted integer array where the range of elements are in the inclusive range [lower, upper], return its…

  Given n non-negative integers a1, a2, …, an, where each represents a point at coordinate (i, ai).…

  A linked list is given such that each node contains an additional random pointer which could point to a…