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138. Copy List with Random Pointer

138. Copy List with Random Pointer

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

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

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

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

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

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

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

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

String - 67. Add Binary

Given two binary strings, return their sum (also a binary string).

Math - 50. Pow(x, n)

Math - 50. Pow(x, n)

Implement pow(x, n), which calculates x raised to the power n (xn).

String - 44. Wildcard Matching

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

DFS&BFS - 37. Sudoku Solver

Write a program to solve a Sudoku puzzle by filling the empty cells.

Array - 36. Valid Sudoku

Array - 36. Valid Sudoku

Determine if a 9x9 Sudoku board is valid.

Array - 57. Insert Interval

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

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

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

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

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

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

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.

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