LeetCode-Solutions

LeetCode Topics

Array

Problem Name	Difficulty
0001-two-sum	Easy
0034-find-first-and-last-position-of-element-in-sorted-array	Medium
0035-search-insert-position	Easy
0041-first-missing-positive	Hard
0048-rotate-image	Medium
0051-n-queens	Hard
0055-jump-game	Medium
0066-plus-one	Easy
0073-set-matrix-zeroes	Medium
0118-pascals-triangle	Easy
0152-maximum-product-subarray	Medium
0260-single-number-iii	Medium
0485-max-consecutive-ones	Easy
1365-how-many-numbers-are-smaller-than-the-current-number	Easy
1672-richest-customer-wealth	Easy
1732-find-the-highest-altitude	Easy
1833-maximum-ice-cream-bars	Medium
1846-maximum-element-after-decreasing-and-rearranging	Medium
1929-concatenation-of-array	Easy
2574-left-and-right-sum-differences	Easy
3512-minimum-operations-to-make-array-sum-divisible-by-k	Easy
3925-concatenate-array-with-reverse	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
0041-first-missing-positive	Hard
0073-set-matrix-zeroes	Medium
0202-happy-number	Easy
1189-maximum-number-of-balloons	Easy
1365-how-many-numbers-are-smaller-than-the-current-number	Easy
3760-maximum-substrings-with-distinct-start	Medium

Math

Problem Name	Difficulty
0009-palindrome-number	Easy
0012-integer-to-roman	Medium
0013-roman-to-integer	Easy
0029-divide-two-integers	Medium
0048-rotate-image	Medium
0050-powx-n	Medium
0066-plus-one	Easy
0069-sqrtx	Easy
0070-climbing-stairs	Easy
0202-happy-number	Easy
0258-add-digits	Easy
0509-fibonacci-number	Easy
1281-subtract-the-product-and-sum-of-digits-of-an-integer	Easy
1688-count-of-matches-in-tournament	Easy
2235-add-two-integers	Easy
2413-smallest-even-multiple	Easy
2427-number-of-common-factors	Easy
2469-convert-the-temperature	Easy
2652-sum-multiples	Easy
2769-find-the-maximum-achievable-number	Easy
3512-minimum-operations-to-make-array-sum-divisible-by-k	Easy
3783-mirror-distance-of-an-integer	Easy

String

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters	Medium
0012-integer-to-roman	Medium
0013-roman-to-integer	Easy
0020-valid-parentheses	Easy
0022-generate-parentheses	Medium
0028-find-the-index-of-the-first-occurrence-in-a-string	Easy
0125-valid-palindrome	Easy
0344-reverse-string	Easy
1189-maximum-number-of-balloons	Easy
3760-maximum-substrings-with-distinct-start	Medium

Linked List

Problem Name	Difficulty
0024-swap-nodes-in-pairs	Medium

Recursion

Problem Name	Difficulty
0024-swap-nodes-in-pairs	Medium
0050-powx-n	Medium
0509-fibonacci-number	Easy

Sorting

Problem Name	Difficulty
1365-how-many-numbers-are-smaller-than-the-current-number	Easy
1833-maximum-ice-cream-bars	Medium
1846-maximum-element-after-decreasing-and-rearranging	Medium

Counting Sort

Problem Name	Difficulty
1189-maximum-number-of-balloons	Easy
1365-how-many-numbers-are-smaller-than-the-current-number	Easy
1833-maximum-ice-cream-bars	Medium

Enumeration

Problem Name	Difficulty
2427-number-of-common-factors	Easy

Number Theory

Problem Name	Difficulty
0258-add-digits	Easy
2413-smallest-even-multiple	Easy
2427-number-of-common-factors	Easy

Binary Search

Problem Name	Difficulty
0034-find-first-and-last-position-of-element-in-sorted-array	Medium
0035-search-insert-position	Easy
0069-sqrtx	Easy

Stack

Problem Name	Difficulty
0020-valid-parentheses	Easy

Two Pointers

Problem Name	Difficulty
0028-find-the-index-of-the-first-occurrence-in-a-string	Easy
0125-valid-palindrome	Easy
0202-happy-number	Easy
0344-reverse-string	Easy

String Matching

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

Simulation

Problem Name	Difficulty
0258-add-digits	Easy
1688-count-of-matches-in-tournament	Easy
1929-concatenation-of-array	Easy
3925-concatenate-array-with-reverse	Easy

Dynamic Programming

Problem Name	Difficulty
0022-generate-parentheses	Medium
0055-jump-game	Medium
0070-climbing-stairs	Easy
0118-pascals-triangle	Easy
0152-maximum-product-subarray	Medium
0509-fibonacci-number	Easy

Memoization

Problem Name	Difficulty
0070-climbing-stairs	Easy
0509-fibonacci-number	Easy

Bit Manipulation

Problem Name	Difficulty
0029-divide-two-integers	Medium
0260-single-number-iii	Medium
0476-number-complement	Easy

Matrix

Problem Name	Difficulty
0048-rotate-image	Medium
0073-set-matrix-zeroes	Medium
1672-richest-customer-wealth	Easy

Prefix Sum

Problem Name	Difficulty
1732-find-the-highest-altitude	Easy
2574-left-and-right-sum-differences	Easy

Greedy

Problem Name	Difficulty
0055-jump-game	Medium
1833-maximum-ice-cream-bars	Medium
1846-maximum-element-after-decreasing-and-rearranging	Medium

Backtracking

Problem Name	Difficulty
0022-generate-parentheses	Medium
0051-n-queens	Hard

Database

Problem Name	Difficulty
0175-combine-two-tables	Easy
0178-rank-scores	Medium
0181-employees-earning-more-than-their-managers	Easy
0627-swap-sex-of-employees	Easy

Sliding Window

Problem Name	Difficulty
0003-longest-substring-without-repeating-characters	Medium