[Leetcode] Leetcode 추천 75문제 정리

해외 어느 구직 커뮤니티에 올라온 ‘새해 선물 - 당신의 시간을 아껴줄 Leetcode Top 75문제 선별해봄.’글에 나열된 75문제의 문제 번호와 난이도를 찾아서 정리해보았다. 부지런히 풀어야지🤓

문제 풀이 모음집

• Difficulty: 🟢(Easy), 🟡(Medium), 🔴(Hard)

Array

Status	Nr.	Title	Difficulty	My Solution
✅	1	Two Sum	🟢
✅	121	Best Time to Buy and Sell Stock	🟢
✅	217	Contains Duplicate	🟢
✅	238	Product of Array Except Self	🟡
✅	53	Maximum Subarray	🟡	🗝
✅	152	Maximum Product Subarray	🟡	🗝
✅	153	Find Minimum in Rotated Sorted Array	🟡	🗝
	33	Search in Rotated Sorted Array	🟡
	15	3Sum	🟡
	11	Container With Most Water	🟡

Binary

Status	No.	Title	Difficulty
	371	Sum of Two Integers	🟡
	191	Number of 1 Bits	🟢
	338	Counting Bits	🟢
	268	Missing Number	🟢
	190	Reverse Bits	🟢

Dynamic Programming

Status	No.	Title	Difficulty
	70	Climbing Stairs	🟢
	322	Coin Change	🟡
	300	Longest Increasing Subsequence	🟡
	1143	Longest Common Subsequence	🟡
	139	Word Break	🟡
	377	Combination Sum 4	🟡
	198	House Robber	🟡
	213	House Robber 2	🟡
	91	Decode Ways	🟡
	62	Unique Paths	🟡
	55	Jump Game	🟡

Graph

Status	No.	Title	Difficulty
	133	Clone Graph	🟡
	207	Course Schedule	🟡
	417	Pacific Atlantic Water Flow	🟡
	200	Number of Islands	🟡
	128	Longest Consecutive Sequence	🟡
	269	Alien Dictionary (Leetcode Premium)	🟡
	261	Graph Valid Tree (Leetcode Premium)	🟡
	323	Number of Connected Components in an Undirected Graph (Leetcode Premium)	🟡

Interval

Status	No.	Title	Difficulty
	57	Insert Interval	🟡
	56	Merge Intervals	🟡
	435	Non-overlapping Intervals	🟡
	252	Meeting Rooms (Leetcode Premium)	🟢
	253	Meeting Rooms 2 (Leetcode Premium)	🟡

Linked List

Status	No.	Title	Difficulty	My Solution
✅	206	Reverse Linked List	🟢	🗝
✅	141	Linked List Cycle	🟢
✅	21	Merge Two Sorted Lists	🟢	🗝
	23	Merge K Sorted Lists	🔴
	19	Remove Nth Node From End Of List	🟡
	143	Reorder List	🟡

Matrix

Status	No.	Title	Difficulty
	73	Set Matrix Zeroes	🟡
	54	Spiral Matrix	🟡
	48	Rotate Image	🟡
	79	Word Search	🟡

String

Status	No.	Title	Difficulty
✅	3	Longest Substring Without Repeating Characters	🟡
	424	Longest Repeating Character Replacement	🟡
	76	Minimum Window Substring	🔴
	242	Valid Anagram	🟢
	49	Group Anagrams	🟡
	20	Valid Parentheses	🟢
	125	Valid Palindrome	🟢
	5	Longest Palindromic Substring	🟡
	647	Palindromic Substrings	🟡
	271	Encode and Decode Strings (Leetcode Premium)	🟡

Tree

No.	Title	Difficulty
	104	Maximum Depth of Binary Tree	🟢
	100	Same Tree	🟢
	226	Invert Binary Tree	🟢
	124	Binary Tree Maximum Path Sum	🔴
	102	Binary Tree Level Order Traversal	🟡
	297	Serialize and Deserialize Binary Tree	🔴
	572	Subtree of Another Tree	🟢
	105	Construct Binary Tree from Preorder and Inorder Traversal	🟡
	98	Validate Binary Search Tree	🟡
	230	Kth Smallest Element in a BST	🟡
	235	Lowest Common Ancestor of BST	🟢
	208	Implement Trie (Prefix Tree)	🟡
	211	Design Add and Search Words Data Structure	🟡
	212	Word Search 2	🔴

Heap

Status	No.	Title	Difficulty
	23	Merge K Sorted Lists	🔴
	347	Top K Frequent Elements	🟡
	295	Find Median from Data Stream	🔴