DSA Important LeetCode Problems

Arrays/Strings-1 Easy

https://leetcode.com/problems/remove-element/

https://leetcode.com/problems/find-the-index-of-the-first-occurrence-in-a-string

https://leetcode.com/problems/longest-common-prefix

https://leetcode.com/problems/length-of-last-word/

https://leetcode.com/problems/roman-to-integer/

https://leetcode.com/problems/merge-sorted-array/

https://leetcode.com/problems/best-time-to-buy-and-sell-stock/

Medium

https://leetcode.com/problems/remove-duplicates-from-sorted-array-ii

https://leetcode.com/problems/rotate-array/

https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/

https://leetcode.com/problems/jump-game

https://leetcode.com/problems/reverse-words-in-a-string

Hard

https://leetcode.com/problems/trapping-rain-water

https://leetcode.com/problems/candy

Arrays/Strings-2 Easy

https://leetcode.com/problems/defanging-an-ip-address

https://leetcode.com/problems/maximum-number-of-words-found-in-sentences

https://leetcode.com/problems/check-if-two-string-arrays-are-equivalent

https://leetcode.com/problems/number-of-senior-citizens

Medium

https://leetcode.com/problems/minimum-amount-of-time-to-collect-garbage

https://leetcode.com/problems/find-and-replace-pattern

https://leetcode.com/problems/number-of-pairs-of-strings-with-concatenation-equal-to-target

Hard

https://leetcode.com/problems/valid-number

Matrix Medium

https://leetcode.com/problems/valid-sudoku/

https://leetcode.com/problems/spiral-matrix

https://leetcode.com/problems/rotate-image

https://leetcode.com/problems/set-matrix-zeroes

https://leetcode.com/problems/game-of-life

2 Pointer Easy

https://leetcode.com/problems/valid-palindrome

https://leetcode.com/problems/is-subsequence

Medium

https://leetcode.com/problems/two-sum-ii-input-array-is-sorted

https://leetcode.com/problems/container-with-most-water

https://leetcode.com/problems/3sum

Sliding Window Medium

https://leetcode.com/problems/minimum-size-subarray-sum

https://leetcode.com/problems/longest-substring-without-repeating-characters

Hard

https://leetcode.com/problems/substring-with-concatenation-of-all-words

https://leetcode.com/problems/minimum-window-substring

Hashmap Easy

https://leetcode.com/problems/ransom-note

https://leetcode.com/problems/isomorphic-strings

https://leetcode.com/problems/word-pattern

https://leetcode.com/problems/valid-anagram

https://leetcode.com/problems/two-sum

https://unhealthyirreparable.com/cit2c8ca?key=7566cfdb82de49ba4912160b26b7621f

Medium

https://leetcode.com/problems/group-anagrams

https://leetcode.com/problems/longest-consecutive-sequence

Stack Easy

https://leetcode.com/problems/valid-parentheses

https://leetcode.com/problems/next-greater-element-i/

Medium

https://leetcode.com/problems/min-stack

https://leetcode.com/problems/simplify-path

Linked List Easy

https://leetcode.com/problems/linked-list-cycle

https://leetcode.com/problems/merge-two-sorted-lists

Medium

https://leetcode.com/problems/add-two-numbers

https://leetcode.com/problems/reverse-linked-list-ii

https://leetcode.com/problems/rotate-list

https://leetcode.com/problems/remove-nth-node-from-end-of-list

Hard

https://leetcode.com/problems/reverse-nodes-in-k-group

Binary Search Easy

https://leetcode.com/problems/search-insert-position

Medium

https://leetcode.com/problems/search-a-2d-matrix

https://leetcode.com/problems/find-peak-element

https://leetcode.com/problems/search-in-rotated-sorted-array

Hard

https://leetcode.com/problems/median-of-two-sorted-arrays

Kadane's Algo

Medium 

https://leetcode.com/problems/maximum-subarray

https://leetcode.com/problems/maximum-sum-circular-subarray

Bit Manipulation

Easy

https://leetcode.com/problems/add-binary

https://leetcode.com/problems/reverse-bits

https://leetcode.com/problems/number-of-1-bits

https://leetcode.com/problems/single-number

Math Easy

https://leetcode.com/problems/palindrome-number

https://leetcode.com/problems/sqrtx

Medium

https://leetcode.com/problems/powx-n

Backtracking 

Medium

https://leetcode.com/problems/combinations

https://leetcode.com/problems/permutations

https://leetcode.com/problems/combination-sum

https://leetcode.com/problems/n-queens-ii

https://leetcode.com/problems/letter-combinations-of-a-phone-number

Binary Tree

Easy

https://leetcode.com/problems/maximum-depth-of-binary-tree

https://leetcode.com/problems/symmetric-tree

https://leetcode.com/problems/path-sum

Medium

https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree

https://leetcode.com/problems/count-complete-tree-nodes

Binary Tree BFS 

Easy

https://leetcode.com/problems/average-of-levels-in-binary-tree

Medium

https://leetcode.com/problems/binary-tree-level-order-traversal

https://leetcode.com/problems/binary-tree-right-side-view

Binary Search Tree

Medium

https://leetcode.com/problems/validate-binary-search-tree

https://leetcode.com/problems/kth-smallest-element-in-a-bst

https://leetcode.com/problems/minimum-absolute-difference-in-bst

Graph General

Medium

https://leetcode.com/problems/number-of-islands

https://leetcode.com/problems/surrounded-regions

https://leetcode.com/problems/clone-graph

https://leetcode.com/problems/course-schedule/

Heap

Medium

https://leetcode.com/problems/kth-largest-element-in-an-array

Hard

https://leetcode.com/problems/find-median-from-data-stream

1D DP

Easy

https://leetcode.com/problems/climbing-stairs

Medium

https://leetcode.com/problems/coin-change

https://leetcode.com/problems/house-robber

https://leetcode.com/problems/longest-increasing-subsequence

https://leetcode.com/problems/word-break

Multi Dimensional DP

Medium

https://leetcode.com/problems/longest-palindromic-substring

https://leetcode.com/problems/minimum-path-sum

https://leetcode.com/problems/triangle

Hard

https://leetcode.com/problems/best-time-to-buy-and-sell-stock-iii

https://leetcode.com/problems/best-time-to-buy-and-sell-stock-iv

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