꿈꾸는공학도

https://leetcode.com/problems/subtree-of-another-tree/description/Given the roots of two binary trees root and subRoot, return true if there is a subtree of root with the same structure and node values of subRoot and false otherwise.A subtree of a binary tree tree is a tree that consists of a node in tree and all of this node's descendants. The tree tree could also be considered as a subtree of ..

https://leetcode.com/problems/next-permutation/description/A permutation of an array of integers is an arrangement of its members into a sequence or linear order.For example, for arr = [1,2,3], the following are all the permutations of arr: [1,2,3], [1,3,2], [2, 1, 3], [2, 3, 1], [3,1,2], [3,2,1].The next permutation of an array of integers is the next lexicographically greater permutation of it..

https://leetcode.com/problems/minesweeper/description/Let's play the minesweeper game (Wikipedia, online game)!You are given an m x n char matrix board representing the game board where:'M' represents an unrevealed mine,'E' represents an unrevealed empty square,'B' represents a revealed blank square that has no adjacent mines (i.e., above, below, left, right, and all 4 diagonals),digit ('1' to '..

https://leetcode.com/problems/swap-nodes-in-pairs/description/Given a linked list, swap every two adjacent nodes and return its head. You must solve the problem without modifying the values in the list's nodes (i.e., only nodes themselves may be changed.) Example 1:Input: head = [1,2,3,4]Output: [2,1,4,3]Explanation:Example 2:Input: head = []Output: []Example 3:Input: head = [1]Output: [1]Exampl..

https://leetcode.com/problems/integer-to-roman/description/Seven different symbols represent Roman numerals with the following values:SymbolValueI1V5X10L50C100D500M1000Roman numerals are formed by appending the conversions of decimal place values from highest to lowest. Converting a decimal place value into a Roman numeral has the following rules:If the value does not start with 4 or 9, select t..

https://leetcode.com/problems/largest-number/description/Given a list of non-negative integers nums, arrange them such that they form the largest number and return it.Since the result may be very large, so you need to return a string instead of an integer. Example 1:Input: nums = [10,2]Output: "210"Example 2:Input: nums = [3,30,34,5,9]Output: "9534330" Constraints:1 0 문제 자체는 일단 설명이 짧아서 좋다. 한 번 D..

https://leetcode.com/problems/stone-game-ix/description/Alice and Bob continue their games with stones. There is a row of n stones, and each stone has an associated value. You are given an integer array stones, where stones[i] is the value of the ith stone.Alice and Bob take turns, with Alice starting first. On each turn, the player may remove any stone from stones. The player who removes a ston..

https://leetcode.com/problems/maximum-depth-of-n-ary-tree/description/?envType=problem-list-v2&envId=treeGiven a n-ary tree, find its maximum depth.The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.Nary-Tree input serialization is represented in their level order traversal, each group of children is separated by the null value (See ..

https://leetcode.com/problems/my-calendar-ii/description/You are implementing a program to use as your calendar. We can add a new event if adding the event will not cause a triple booking.A triple booking happens when three events have some non-empty intersection (i.e., some moment is common to all the three events.).The event can be represented as a pair of integers start and end that represent..

https://leetcode.com/problems/search-a-2d-matrix-ii/description/Write an efficient algorithm that searches for a value target in an m x n integer matrix matrix. This matrix has the following properties:Integers in each row are sorted in ascending from left to right.Integers in each column are sorted in ascending from top to bottom. Example 1:Input: matrix = [[1,4,7,11,15],[2,5,8,12,19],[3,6,9,16..