806. Number of Lines To Write StringWe are to write the letters of a given string S, from left to right into lines. Each line has maximum width 100 units, and if writing a letter would cause the width...

804. Unique Morse Code Wordshttps://leetcode.com/problems/unique-morse-code-words/description/International Morse Code defines a standard encoding where each letter is mapped to a series of dots and d...

771. Jewels and StonesYou're given strings J representing the types of stones that are jewels, and S representing the stones you have.  Each character in S is a type of stone you have.  You want to kn...

617. Merge Two Binary TreesGiven two binary trees and imagine that when you put one of them to cover the other, some nodes of the two trees are overlapped while the others are not.You need to merge th...

461. Hamming Distancehttps://leetcode.com/problems/hamming-distance/description/The Hamming distance between two integers is the number of positions at which the corresponding bits are different.Given...

leecode 地址：https://leetcode.com/problems/remove-duplicates-from-sorted-list/description/Given a sorted linked list, delete all duplicates such that each element appear only once.For example,Given 1-&g...

Two sum class Solution: def twoSum(self, nums, target): dict={} for i in range(len(nums)): if target -nums[i] in dict: return [dict[target -nums[i]],i] ...