My-Leetcode-Solutions

A collection of LeetCode questions to ace the increase my DSA Understandings

LeetCode Topics

Array

Problem Name	Difficulty
0004-median-of-two-sorted-arrays	Hard
0015-3sum	Medium
0018-4sum	Medium
0033-search-in-rotated-sorted-array	Medium
0034-find-first-and-last-position-of-element-in-sorted-array	Medium
0035-search-insert-position
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0048-rotate-image	Medium
0051-n-queens
0054-spiral-matrix	Medium
0056-merge-intervals	Medium
0063-unique-paths-ii
0064-minimum-path-sum
0079-word-search
0081-search-in-rotated-sorted-array-ii	Medium
0090-subsets-ii
0120-triangle
0122-best-time-to-buy-and-sell-stock-ii
0123-best-time-to-buy-and-sell-stock-iii
0128-longest-consecutive-sequence	Medium
0139-word-break
0152-maximum-product-subarray	Medium
0153-find-minimum-in-rotated-sorted-array	Medium
0162-find-peak-element	Medium
0188-best-time-to-buy-and-sell-stock-iv
0198-house-robber
0213-house-robber-ii
0216-combination-sum-iii
0229-majority-element-ii	Medium
0240-search-a-2d-matrix-ii	Medium
0300-longest-increasing-subsequence
0309-best-time-to-buy-and-sell-stock-with-cooldown
0312-burst-balloons
0322-coin-change
0368-largest-divisible-subset
0410-split-array-largest-sum	Hard
0416-partition-equal-subset-sum
0455-assign-cookies
0493-reverse-pairs	Hard
0494-target-sum
0518-coin-change-ii
0540-single-element-in-a-sorted-array	Medium
0673-number-of-longest-increasing-subsequence
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0792-binary-search
0875-koko-eating-bananas	Medium
0904-fruit-into-baskets	Medium
0967-minimum-falling-path-sum
1004-max-consecutive-ones-iii	Medium
1011-capacity-to-ship-packages-within-d-days	Medium
1129-longest-string-chain
1283-find-the-smallest-divisor-given-a-threshold	Medium
1482-minimum-number-of-days-to-make-m-bouquets	Medium
1539-kth-missing-positive-number	Easy
1559-cherry-pickup-ii
1669-minimum-cost-to-cut-a-stick
1901-find-a-peak-element-ii	Medium
2149-rearrange-array-elements-by-sign	Medium
3799-unique-3-digit-even-numbers

Backtracking

Problem Name	Difficulty
0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0051-n-queens
0079-word-search
0090-subsets-ii
0131-palindrome-partitioning
0216-combination-sum-iii
0282-expression-add-operators
0494-target-sum
3453-generate-binary-strings-without-adjacent-zeros

String

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters
0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0044-wildcard-matching
0058-length-of-last-word
0072-edit-distance
0079-word-search
0115-distinct-subsequences
0131-palindrome-partitioning
0139-word-break
0282-expression-add-operators
0516-longest-palindromic-subsequence
0583-delete-operation-for-two-strings
1129-longest-string-chain
1170-shortest-common-supersequence
1197-parsing-a-boolean-expression
1250-longest-common-subsequence
1437-minimum-insertion-steps-to-make-a-string-palindrome
3453-generate-binary-strings-without-adjacent-zeros

Bit Manipulation

Problem Name	Difficulty
0090-subsets-ii
3453-generate-binary-strings-without-adjacent-zeros
3600-find-the-k-th-character-in-string-game-i

Hash Table

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters
0017-letter-combinations-of-a-phone-number
0037-sudoku-solver
0128-longest-consecutive-sequence	Medium
0139-word-break
0229-majority-element-ii	Medium
0904-fruit-into-baskets	Medium
1129-longest-string-chain
3799-unique-3-digit-even-numbers

Dynamic Programming

Problem Name	Difficulty
0022-generate-parentheses
0044-wildcard-matching
0062-unique-paths
0063-unique-paths-ii
0064-minimum-path-sum
0070-climbing-stairs
0072-edit-distance
0115-distinct-subsequences
0120-triangle
0122-best-time-to-buy-and-sell-stock-ii
0123-best-time-to-buy-and-sell-stock-iii
0131-palindrome-partitioning
0139-word-break
0152-maximum-product-subarray	Medium
0188-best-time-to-buy-and-sell-stock-iv
0198-house-robber
0213-house-robber-ii
0300-longest-increasing-subsequence
0309-best-time-to-buy-and-sell-stock-with-cooldown
0312-burst-balloons
0322-coin-change
0368-largest-divisible-subset
0410-split-array-largest-sum	Hard
0416-partition-equal-subset-sum
0494-target-sum
0516-longest-palindromic-subsequence
0518-coin-change-ii
0583-delete-operation-for-two-strings
0673-number-of-longest-increasing-subsequence
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0967-minimum-falling-path-sum
1129-longest-string-chain
1170-shortest-common-supersequence
1250-longest-common-subsequence
1437-minimum-insertion-steps-to-make-a-string-palindrome
1559-cherry-pickup-ii
1669-minimum-cost-to-cut-a-stick

Depth-First Search

Problem Name	Difficulty
0079-word-search

Matrix

Problem Name	Difficulty
0037-sudoku-solver
0048-rotate-image	Medium
0054-spiral-matrix	Medium
0063-unique-paths-ii
0064-minimum-path-sum
0079-word-search
0240-search-a-2d-matrix-ii	Medium
0967-minimum-falling-path-sum
1559-cherry-pickup-ii
1901-find-a-peak-element-ii	Medium

Trie

Problem Name	Difficulty
0139-word-break

Memoization

Problem Name	Difficulty
0070-climbing-stairs
0139-word-break

Math

Problem Name	Difficulty
0002-add-two-numbers
0048-rotate-image	Medium
0062-unique-paths
0069-sqrtx	Easy
0070-climbing-stairs
0282-expression-add-operators
0368-largest-divisible-subset
3600-find-the-k-th-character-in-string-game-i

Recursion

Problem Name	Difficulty
0002-add-two-numbers
0044-wildcard-matching
1197-parsing-a-boolean-expression
3600-find-the-k-th-character-in-string-game-i
3799-unique-3-digit-even-numbers

Simulation

Problem Name	Difficulty
0054-spiral-matrix	Medium
2149-rearrange-array-elements-by-sign	Medium
3600-find-the-k-th-character-in-string-game-i

Enumeration

Problem Name	Difficulty
3799-unique-3-digit-even-numbers

Linked List

Problem Name	Difficulty
0002-add-two-numbers

Combinatorics

Problem Name	Difficulty
0062-unique-paths

Two Pointers

Problem Name	Difficulty
0015-3sum	Medium
0018-4sum	Medium
0455-assign-cookies
1129-longest-string-chain
2149-rearrange-array-elements-by-sign	Medium

Greedy

Problem Name	Difficulty
0044-wildcard-matching
0122-best-time-to-buy-and-sell-stock-ii
0410-split-array-largest-sum	Hard
0455-assign-cookies
0714-best-time-to-buy-and-sell-stock-with-transaction-fee

Sorting

Problem Name	Difficulty
0015-3sum	Medium
0018-4sum	Medium
0056-merge-intervals	Medium
0229-majority-element-ii	Medium
0368-largest-divisible-subset
0455-assign-cookies
1129-longest-string-chain
1669-minimum-cost-to-cut-a-stick

Breadth-First Search

Problem Name	Difficulty
0322-coin-change

Binary Search

Problem Name	Difficulty
0004-median-of-two-sorted-arrays	Hard
0033-search-in-rotated-sorted-array	Medium
0034-find-first-and-last-position-of-element-in-sorted-array	Medium
0035-search-insert-position
0069-sqrtx	Easy
0081-search-in-rotated-sorted-array-ii	Medium
0153-find-minimum-in-rotated-sorted-array	Medium
0162-find-peak-element	Medium
0240-search-a-2d-matrix-ii	Medium
0300-longest-increasing-subsequence
0410-split-array-largest-sum	Hard
0493-reverse-pairs	Hard
0540-single-element-in-a-sorted-array	Medium
0792-binary-search
0875-koko-eating-bananas	Medium
1004-max-consecutive-ones-iii	Medium
1011-capacity-to-ship-packages-within-d-days	Medium
1283-find-the-smallest-divisor-given-a-threshold	Medium
1482-minimum-number-of-days-to-make-m-bouquets	Medium
1539-kth-missing-positive-number	Easy
1901-find-a-peak-element-ii	Medium

Binary Indexed Tree

Problem Name	Difficulty
0493-reverse-pairs	Hard
0673-number-of-longest-increasing-subsequence

Segment Tree

Problem Name	Difficulty
0493-reverse-pairs	Hard
0673-number-of-longest-increasing-subsequence

Stack

Problem Name	Difficulty
0901-online-stock-span	Medium
1197-parsing-a-boolean-expression

Sliding Window

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters
0904-fruit-into-baskets	Medium
1004-max-consecutive-ones-iii	Medium

Design

Problem Name	Difficulty
0901-online-stock-span	Medium

Monotonic Stack

Problem Name	Difficulty
0901-online-stock-span	Medium

Data Stream

Problem Name	Difficulty
0901-online-stock-span	Medium

Prefix Sum

Problem Name	Difficulty
0410-split-array-largest-sum	Hard
1004-max-consecutive-ones-iii	Medium

Union-Find

Problem Name	Difficulty
0128-longest-consecutive-sequence	Medium

Counting

Problem Name	Difficulty
0229-majority-element-ii	Medium

Divide and Conquer

Problem Name	Difficulty
0004-median-of-two-sorted-arrays	Hard
0240-search-a-2d-matrix-ii	Medium
0493-reverse-pairs	Hard

Merge Sort

Problem Name	Difficulty
0493-reverse-pairs	Hard

Ordered Set

Problem Name	Difficulty
0493-reverse-pairs	Hard

Newton's Method

Problem Name	Difficulty
0069-sqrtx	Easy