DSA

Repository containing all my Leet Code submissions and DSA practice solutions.

LeetCode Topics

Linked List

Problem Name	Difficulty
0021-merge-two-sorted-lists	Easy
0061-rotate-list	Medium
2095-delete-the-middle-node-of-a-linked-list	Medium

Two Pointers

Problem Name	Difficulty
0061-rotate-list	Medium
0455-assign-cookies	Easy
0832-flipping-an-image	Easy
2095-delete-the-middle-node-of-a-linked-list	Medium
2540-minimum-common-value	Easy

Array

Problem Name	Difficulty
0001-two-sum	Easy
0154-find-minimum-in-rotated-sorted-array-ii	Hard
0238-product-of-array-except-self	Medium
0455-assign-cookies	Easy
0503-next-greater-element-ii	Medium
0665-non-decreasing-array	Medium
0682-baseball-game	Easy
0698-partition-to-k-equal-sum-subsets	Medium
0739-daily-temperatures	Medium
0832-flipping-an-image	Easy
0860-lemonade-change	Easy
0931-minimum-falling-path-sum	Medium
1582-special-positions-in-a-binary-matrix	Easy
1752-check-if-array-is-sorted-and-rotated	Easy
2144-minimum-cost-of-buying-candies-with-discount	Easy
2540-minimum-common-value	Easy
2553-separate-the-digits-in-an-array	Easy
2574-left-and-right-sum-differences	Easy
2784-check-if-array-is-good	Easy
3838-weighted-word-mapping	Easy

Simulation

Problem Name	Difficulty
0682-baseball-game	Easy
0832-flipping-an-image	Easy
2553-separate-the-digits-in-an-array	Easy
3612-process-string-with-special-operations-i	Medium
3838-weighted-word-mapping	Easy

Math

Problem Name	Difficulty
0263-ugly-number	Easy
1359-count-all-valid-pickup-and-delivery-options	Hard
2929-distribute-candies-among-children-ii	Medium
3751-total-waviness-of-numbers-in-range-i	Medium

Prefix Sum

Problem Name	Difficulty
0238-product-of-array-except-self	Medium
2574-left-and-right-sum-differences	Easy

Hash Table

Problem Name	Difficulty
0001-two-sum	Easy
0387-first-unique-character-in-a-string	Easy
0865-smallest-subtree-with-all-the-deepest-nodes	Medium
1347-minimum-number-of-steps-to-make-two-strings-anagram	Medium
2540-minimum-common-value	Easy
2784-check-if-array-is-good	Easy
3120-count-the-number-of-special-characters-i	Easy

String

Problem Name	Difficulty
0387-first-unique-character-in-a-string	Easy
0516-longest-palindromic-subsequence	Medium
1347-minimum-number-of-steps-to-make-two-strings-anagram	Medium
3120-count-the-number-of-special-characters-i	Easy
3612-process-string-with-special-operations-i	Medium
3838-weighted-word-mapping	Easy

Queue

Problem Name	Difficulty
0225-implement-stack-using-queues	Easy
0387-first-unique-character-in-a-string	Easy

Counting

Problem Name	Difficulty
0387-first-unique-character-in-a-string	Easy
1347-minimum-number-of-steps-to-make-two-strings-anagram	Medium

Sorting

Problem Name	Difficulty
0455-assign-cookies	Easy
2144-minimum-cost-of-buying-candies-with-discount	Easy
2784-check-if-array-is-good	Easy

Binary Search

Problem Name	Difficulty
0154-find-minimum-in-rotated-sorted-array-ii	Hard
2540-minimum-common-value	Easy

Tree

Problem Name	Difficulty
0865-smallest-subtree-with-all-the-deepest-nodes	Medium

Depth-First Search

Problem Name	Difficulty
0865-smallest-subtree-with-all-the-deepest-nodes	Medium

Breadth-First Search

Problem Name	Difficulty
0865-smallest-subtree-with-all-the-deepest-nodes	Medium

Binary Tree

Problem Name	Difficulty
0865-smallest-subtree-with-all-the-deepest-nodes	Medium

Greedy

Problem Name	Difficulty
0455-assign-cookies	Easy
0860-lemonade-change	Easy
2144-minimum-cost-of-buying-candies-with-discount	Easy

Dynamic Programming

Problem Name	Difficulty
0516-longest-palindromic-subsequence	Medium
0698-partition-to-k-equal-sum-subsets	Medium
0931-minimum-falling-path-sum	Medium
1359-count-all-valid-pickup-and-delivery-options	Hard
3751-total-waviness-of-numbers-in-range-i	Medium

Backtracking

Problem Name	Difficulty
0698-partition-to-k-equal-sum-subsets	Medium

Bit Manipulation

Problem Name	Difficulty
0698-partition-to-k-equal-sum-subsets	Medium
0832-flipping-an-image	Easy

Memoization

Problem Name	Difficulty
0698-partition-to-k-equal-sum-subsets	Medium

Bitmask

Problem Name	Difficulty
0698-partition-to-k-equal-sum-subsets	Medium

Combinatorics

Problem Name	Difficulty
1359-count-all-valid-pickup-and-delivery-options	Hard
2929-distribute-candies-among-children-ii	Medium

Matrix

Problem Name	Difficulty
0832-flipping-an-image	Easy
0931-minimum-falling-path-sum	Medium
1582-special-positions-in-a-binary-matrix	Easy

Enumeration

Problem Name	Difficulty
2929-distribute-candies-among-children-ii	Medium
3751-total-waviness-of-numbers-in-range-i	Medium

Stack

Problem Name	Difficulty
0225-implement-stack-using-queues	Easy
0503-next-greater-element-ii	Medium
0682-baseball-game	Easy
0739-daily-temperatures	Medium

Design

Problem Name	Difficulty
0225-implement-stack-using-queues	Easy

Monotonic Stack

Problem Name	Difficulty
0503-next-greater-element-ii	Medium
0739-daily-temperatures	Medium

Recursion

Problem Name	Difficulty
0021-merge-two-sorted-lists	Easy