原创 leetcode 36: Valid Sudoku
問題描述： Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules. The Sudoku board could be partially
2020-07-04 14:18:38
原创 leetcode 111: Minimum Depth of Binary Tree
問題描述： Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path
2020-07-04 14:18:27
原创 leetcode 19: Remove Nth Node From End of List
問題描述： Given a linked list, remove the nth node from the end of list and return its head. For example, Given linked
2020-07-04 14:18:25
原创 leetcode 118: Pascal's Triangle
問題描述： Given numRows, generate the first numRows of Pascal’s triangle. For example, given numRows = 5, Return [
2020-07-04 14:18:25
原创 leetcode 290： Word Pattern
問題描述： Given a pattern and a string str, find if str follows the same pattern. Here follow means a full match, such
2020-07-04 14:18:23
原创 leetcode 66: Plus One
問題描述： Given a non-negative number represented as an array of digits, plus one to the number. The digits are stored
2020-02-25 06:48:39
原创 leetcode 160：Intersection of Two Linked Lists
問題描述： Write a program to find the node at which the intersection of two singly linked lists begins. 思路： 題目說O(n)時間解決
2020-02-25 06:48:39
原创 leetcode 328 Odd Even Linked List
問題描述： Given a singly linked list, group all odd nodes together followed by the even nodes. Please note here we are
2020-02-25 06:48:39
原创 leetcode 198: House Robber
問題描述： You are a professional robber planning to rob houses along a street. Each house has a certain amount of money
2020-02-25 06:48:39
原创 leetcode 219： Contains Duplicate II
問題描述： Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the a
2020-02-25 06:48:39
原创 leetcode 38：count and say
問題描述： The count-and-say sequence is the sequence of integers beginning as follows: 1, 11, 21, 1211, 111221, … 1 is
2020-02-25 06:48:39
原创 leetcode 205 ： Isomorphic Strings
問題描述： Given two strings s and t, determine if they are isomorphic. Two strings are isomorphic if the characters in
2020-02-25 06:48:39
原创 leetcode 172: Factorial Trailing Zeroes
問題描述： Given an integer n, return the number of trailing zeroes in n!. Note: Your solution should be in logarithmic
2020-02-25 06:48:39
原创 leetcode 107: Binary Tree Level Order Traversal II
問題描述： Given a binary tree, return the bottom-up level order traversal of its nodes’ values. (ie, from left to right
2020-02-25 06:48:39
原创 leetcode 101: Symmetric Tree
問題描述： Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, t
2020-02-25 06:48:39