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Given two listsA andB, andBis an anagram ofA.Bis an anagram ofAmeansBis made by randomizing theorder of the elements inA. We want to find anindex mappingP, fromAtoB. A mappingP[i] =...

You're given stringsJrepresenting the types of stones that are jewels, andSrepresenting the stones you have. Each character inSis a type of stone you have. You want to know how many of the sto...

Description: Given an array of integers, returnindicesof the two numbers such that they add up to a specific target. You may assume that each input would haveexactlyone solution, and you may no...

International Morse Code defines a standard encoding where each letter is mapped to a series of dots and dashes, as follows:"a"maps to".-","b"maps to"-...","c"maps to"-.-.", and so on. For c...

Suppose we have a class: public class Foo { public void first() { print("first"); } public void second() { print("second"); } public void third() { print("third"); } } The same instance ofFo...

Given therootnode of a binary search tree, return the sum of values of all nodes with value betweenLandR(inclusive). The binary search tree is guaranteed to have unique values. Example 1: ...

第一次挑战Medium的题： Suppose you are given the following code: class ZeroEvenOdd { public ZeroEvenOdd(int n) { ... } // constructor public void zero(printNumber) { ... } // only output 0's pu...

Given the root node of a binary search tree (BST) and a value. You need to find the node in the BST that the node's value equals the given value. Return the subtree rooted with that node. If such node...

very email consists of a local name and a domain name, separated by the @ sign. For example, inalice@leetcode.com,aliceis the local name, andleetcode.comis the domain name. Besides lowercase le...

Given an array of integersAsorted in non-decreasing order,return an array of the squares of each number,also in sorted non-decreasing order. Example 1: Input: [-4,-1,0,3,10] Output: [0,1,9,16,1...

Given a non-empty, singlylinked list with head nodehead, returnamiddle node of linked list. If there are two middle nodes, return the second middle node. Example 1: Input: [1,2,3,4,5] Outpu...