Algorithms

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시작일: 2025.04 ~ 진행 중

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LeetCode Topics

Array

Problem Name	Difficulty
0001-two-sum	Easy
0004-median-of-two-sorted-arrays	Hard
0011-container-with-most-water	Medium
0014-longest-common-prefix	Easy
0015-3sum	Medium
0016-3sum-closest	Medium
0018-4sum	Medium
0026-remove-duplicates-from-sorted-array	Easy
0027-remove-element	Easy
0036-valid-sudoku	Medium
0066-plus-one	Easy
0088-merge-sorted-array	Easy
0167-two-sum-ii-input-array-is-sorted	Medium
0217-contains-duplicate	Easy
0219-contains-duplicate-ii	Easy
0283-move-zeroes	Easy
0350-intersection-of-two-arrays-ii	Easy
0961-n-repeated-element-in-size-2n-array	Easy
1037-valid-boomerang	Easy
2367-number-of-arithmetic-triplets	Easy

Hash Table

Problem Name	Difficulty
0001-two-sum	Easy
0003-longest-substring-without-repeating-characters	Medium
0012-integer-to-roman	Medium
0013-roman-to-integer	Easy
0017-letter-combinations-of-a-phone-number	Medium
0036-valid-sudoku	Medium
0217-contains-duplicate	Easy
0219-contains-duplicate-ii	Easy
0242-valid-anagram	Easy
0350-intersection-of-two-arrays-ii	Easy
0961-n-repeated-element-in-size-2n-array	Easy
1832-check-if-the-sentence-is-pangram	Easy
2367-number-of-arithmetic-triplets	Easy

Math

Problem Name	Difficulty
0002-add-two-numbers	Medium
0007-reverse-integer	Medium
0009-palindrome-number	Easy
0012-integer-to-roman	Medium
0013-roman-to-integer	Easy
0066-plus-one	Easy
1037-valid-boomerang	Easy

String

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters	Medium
0005-longest-palindromic-substring	Medium
0006-zigzag-conversion	Medium
0008-string-to-integer-atoi	Medium
0012-integer-to-roman	Medium
0013-roman-to-integer	Easy
0014-longest-common-prefix	Easy
0017-letter-combinations-of-a-phone-number	Medium
0020-valid-parentheses	Easy
0022-generate-parentheses	Medium
0028-find-the-index-of-the-first-occurrence-in-a-string	Easy
0058-length-of-last-word	Easy
0125-valid-palindrome	Easy
0242-valid-anagram	Easy
0344-reverse-string	Easy
0541-reverse-string-ii	Easy
1832-check-if-the-sentence-is-pangram	Easy

Trie

Problem Name	Difficulty
0014-longest-common-prefix	Easy

Tree

Problem Name	Difficulty
0101-symmetric-tree	Easy

Depth-First Search

Problem Name	Difficulty
0101-symmetric-tree	Easy

Breadth-First Search

Problem Name	Difficulty
0101-symmetric-tree	Easy

Binary Tree

Problem Name	Difficulty
0101-symmetric-tree	Easy

Linked List

Problem Name	Difficulty
0002-add-two-numbers	Medium
0021-merge-two-sorted-lists	Easy
0206-reverse-linked-list	Easy

Recursion

Problem Name	Difficulty
0002-add-two-numbers	Medium
0021-merge-two-sorted-lists	Easy
0206-reverse-linked-list	Easy

Sorting

Problem Name	Difficulty
0015-3sum	Medium
0016-3sum-closest	Medium
0018-4sum	Medium
0088-merge-sorted-array	Easy
0217-contains-duplicate	Easy
0242-valid-anagram	Easy
0350-intersection-of-two-arrays-ii	Easy

Sliding Window

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters	Medium
0219-contains-duplicate-ii	Easy

Two Pointers

Problem Name	Difficulty
0005-longest-palindromic-substring	Medium
0011-container-with-most-water	Medium
0015-3sum	Medium
0016-3sum-closest	Medium
0018-4sum	Medium
0026-remove-duplicates-from-sorted-array	Easy
0027-remove-element	Easy
0028-find-the-index-of-the-first-occurrence-in-a-string	Easy
0088-merge-sorted-array	Easy
0125-valid-palindrome	Easy
0167-two-sum-ii-input-array-is-sorted	Medium
0283-move-zeroes	Easy
0344-reverse-string	Easy
0350-intersection-of-two-arrays-ii	Easy
0541-reverse-string-ii	Easy
2367-number-of-arithmetic-triplets	Easy

Stack

Problem Name	Difficulty
0020-valid-parentheses	Easy

Geometry

Problem Name	Difficulty
1037-valid-boomerang	Easy

Binary Search

Problem Name	Difficulty
0004-median-of-two-sorted-arrays	Hard
0167-two-sum-ii-input-array-is-sorted	Medium
0350-intersection-of-two-arrays-ii	Easy

Divide and Conquer

Problem Name	Difficulty
0004-median-of-two-sorted-arrays	Hard
0190-reverse-bits	Easy

Bit Manipulation

Problem Name	Difficulty
0190-reverse-bits	Easy

Dynamic Programming

Problem Name	Difficulty
0005-longest-palindromic-substring	Medium
0022-generate-parentheses	Medium

String Matching

Problem Name	Difficulty
0028-find-the-index-of-the-first-occurrence-in-a-string	Easy

Backtracking

Problem Name	Difficulty
0017-letter-combinations-of-a-phone-number	Medium
0022-generate-parentheses	Medium

Matrix

Problem Name	Difficulty
0036-valid-sudoku	Medium

Greedy

Problem Name	Difficulty
0011-container-with-most-water	Medium

Enumeration

Problem Name	Difficulty
2367-number-of-arithmetic-triplets	Easy