A linked list of length n is given such that each node contains an additional random pointer, which could point to any node in the list, or null.Construct a deep copy of the list.
1143. Longest Common Subsequence
Given two strings text1 and text2, return *the length of their longest common subsequence. *If there is no common subsequence, return 0.
1335. Minimum Difficulty of a Job Schedule
You want to schedule a list of jobs in d days. Jobs are dependent (i.e To work on the i-th job, you have to finish all the jobs j where 0 <= j < i).
73. Set Matrix Zeroes
Given an m x n matrix. If an element is 0, set its entire row and column to 0. Do it in-place.
重排奇偶有序链表
给定一个链表，其中奇数位是升序的，偶数位是降序的，实现链表的排序。
1496. Path Crossing
Return True if the path crosses itself at any point, that is, if at any time you are on a location you've previously visited. Return False otherwise.
680. Valid Palindrome II
Given a non-empty string s, you may delete at most one character. Judge whether you can make it a palindrome.
String - 71. Simplify Path
Given an absolute path for a file (Unix-style), simplify it. Or in other words, convert it to the canonical path.
String - 67. Add Binary
Given two binary strings, return their sum (also a binary string).
Math - 50. Pow(x, n)
Implement pow(x, n), which calculates x raised to the power n (xn).
String - 44. Wildcard Matching
Given an input string (s) and a pattern (p), implement wildcard pattern matching with support for '?' and '*'.
DFS&BFS - 37. Sudoku Solver
Write a program to solve a Sudoku puzzle by filling the empty cells.
Array - 36. Valid Sudoku
Determine if a 9x9 Sudoku board is valid.
Array - 57. Insert Interval
Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary).
Binary Search - 378. Kth Smallest Element in a Sorted Matrix
Given a n x n matrix where each of the rows and columns are sorted in ascending order, find the kth smallest element in the matrix.
Array - 59. Spiral Matrix II
Given a positive integer n, generate a square matrix filled with elements from 1 to n2 in spiral order.
Array - 54. Spiral Matrix
Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order.
LinkedList - 876. Middle of the Linked List
Given a non-empty, singly linked list with head node head, return a middle node of linked list.
Array - 48. Rotate Image
You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise).
string- 43. Multiply Strings
Given two non-negative integers num1 and num2 represented as strings, return the product of num1 and num2, also represented as a string.