🚀 Daily LeetCode Solutions

A curated collection of 158+ daily LeetCode problem solutions implemented cleanly and efficiently with optimal time & space complexity in Python.

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📊 Summary & Progress

Difficulty	Count	Badge
Easy	38	
Medium	87	
Hard	33	
Total Solved	158	

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📂 Repository Structure

Each problem is organized in its own dedicated directory containing:

• README.md: Problem statement, constraints, and LeetCode link.
• Solution file(s): Clean source code (e.g. .py) with optimized algorithmic approaches.

daily-leetcode/
├── 1-two-sum/
│   ├── README.md
│   └── two-sum.py
├── 121-best-time-to-buy-and-sell-stock/
│   ├── README.md
│   └── best-time-to-buy-and-sell-stock.py
...

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📝 Problems Solved

#	Problem Title	Difficulty	Language	Solution
1	Two Sum		Python	two-sum.py
2	Add Two Numbers		Python	add-two-numbers.py
3	Longest Substring Without Repeating Characters		Python	longest-substring-without-repeating-characters.py
4	Median of Two Sorted Arrays		Python	median-of-two-sorted-arrays.py
5	Longest Palindromic Substring		Python	longest-palindromic-substring.py
6	Zigzag Conversion		Python	zigzag-conversion.py
7	Reverse Integer		Python	reverse-integer.py
9	Palindrome Number		Python	palindrome-number.py
10	Regular Expression Matching		Python	regular-expression-matching.py
11	Container With Most Water		Python	README.md
12	Integer to Roman		Python	integer-to-roman.py
13	Roman to Integer		Python	roman-to-integer.py
14	Longest Common Prefix		Python	longest-common-prefix.py
15	3Sum		Python	3sum.py
16	3Sum Closest		Python	3sum-closest.py
17	Letter Combinations of a Phone Number		Python	letter-combinations-of-a-phone-number.py
18	4Sum		Python	4sum.py
19	Remove Nth Node From End of List		Python	remove-nth-node-from-end-of-list.py
20	Valid Parentheses		Python	valid-parentheses.py
21	Merge Two Sorted Lists		Python	merge-two-sorted-lists.py
22	Generate Parentheses		Python	generate-parentheses.py
23	Merge k Sorted Lists		Python	merge-k-sorted-lists.py
24	Swap Nodes in Pairs		Python	swap-nodes-in-pairs.py
25	Reverse Nodes in k-Group		Python	reverse-nodes-in-k-group.py
26	Remove Duplicates from Sorted Array		Python	remove-duplicates-from-sorted-array.py
27	Remove Element		Python	remove-element.py
28	Find the Index of the First Occurrence in a String		Python	find-the-index-of-the-first-occurrence-in-a-string.py
29	Divide Two Integers		Python	divide-two-integers.py
30	Substring with Concatenation of All Words		Python	substring-with-concatenation-of-all-words.py
31	Next Permutation		Python	next-permutation.py
32	Longest Valid Parentheses		Python	longest-valid-parentheses.py
33	Search in Rotated Sorted Array		Python	search-in-rotated-sorted-array.py
34	Find First and Last Position of Element in Sorted Array		Python	find-first-and-last-position-of-element-in-sorted-array.py
35	Search Insert Position		Python	search-insert-position.py
36	Valid Sudoku		Python	valid-sudoku.py
37	Sudoku Solver		Python	sudoku-solver.py
38	Count and Say		Python	count-and-say.py
39	Combination Sum		Python	combination-sum.py
40	Combination Sum II		Python	combination-sum-ii.py
41	First Missing Positive		Python	first-missing-positive.py
42	Trapping Rain Water		Python	trapping-rain-water.py
43	Multiply Strings		Python	multiply-strings.py
44	Wildcard Matching		Python	wildcard-matching.py
45	Jump Game II		Python	jump-game-ii.py
46	Permutations		Python	README.md
47	Permutations II		Python	permutations-ii.py
48	Rotate Image		Python	rotate-image.py
49	Group Anagrams		Python	group-anagrams.py
50	Pow(x, n)		Python	powx-n.py
51	N-Queens		Python	n-queens.py
52	N-Queens II		Python	n-queens-ii.py
53	Maximum Subarray		Python	maximum-subarray.py
54	Spiral Matrix		Python	spiral-matrix.py
55	Jump Game		Python	jump-game.py
56	Merge Intervals		Python	merge-intervals.py
57	Insert Interval		Python	insert-interval.py
58	Length of Last Word		Python	length-of-last-word.py
59	Spiral Matrix II		Python	spiral-matrix-ii.py
60	Permutation Sequence		Python	permutation-sequence.py
61	Rotate List		Python	rotate-list.py
62	Unique Paths		Python	unique-paths.py
63	Unique Paths II		Python	unique-paths-ii.py
64	Minimum Path Sum		Python	minimum-path-sum.py
65	Valid Number		Python	valid-number.py
66	Plus One		Python	plus-one.py
67	Add Binary		Python	add-binary.py
68	Text Justification		Python	text-justification.py
69	Sqrt(x)		Python	sqrtx.py
70	Climbing Stairs		Python	climbing-stairs.py
71	Simplify Path		Python	simplify-path.py
72	Edit Distance		Python	edit-distance.py
73	Set Matrix Zeroes		Python	set-matrix-zeroes.py
74	Search a 2D Matrix		Python	search-a-2d-matrix.py
75	Sort Colors		Python	sort-colors.py
76	Minimum Window Substring		Python	minimum-window-substring.py
77	Combinations		Python	combinations.py
78	Subsets		Python	subsets.py
79	Word Search		Python	word-search.py
80	Remove Duplicates from Sorted Array II		Python	remove-duplicates-from-sorted-array-ii.py
81	Search in Rotated Sorted Array II		Python	search-in-rotated-sorted-array-ii.py
82	Remove Duplicates from Sorted List II		Python	remove-duplicates-from-sorted-list-ii.py
83	Remove Duplicates from Sorted List		Python	remove-duplicates-from-sorted-list.py
115	Distinct Subsequences		Python	distinct-subsequences.py
121	Best Time to Buy and Sell Stock		Python	best-time-to-buy-and-sell-stock.py
287	Find the Duplicate Number		Python	find-the-duplicate-number.py
628	Maximum Product of Three Numbers		Python	maximum-product-of-three-numbers.py
864	Image Overlap		Python	image-overlap.py
909	Stone Game		Python	stone-game.py
977	Distinct Subsequences II		Python	distinct-subsequences-ii.py
1159	Smallest Subsequence of Distinct Characters		Python	smallest-subsequence-of-distinct-characters.py
1212	Sequential Digits		Python	sequential-digits.py
1240	Stone Game II		Python	stone-game-ii.py
1256	Rank Transform of an Array		Python	rank-transform-of-an-array.py
1386	Shift 2D Grid		Python	shift-2d-grid.py
1487	Cinema Seat Allocation		Python	cinema-seat-allocation.py
1522	Stone Game III		Python	stone-game-iii.py
1574	Maximum Product of Two Elements in an Array		Python	maximum-product-of-two-elements-in-an-array.py
1617	Stone Game IV		Python	stone-game-iv.py
1685	Stone Game V		Python	stone-game-v.py
2002	Stone Game VIII		Python	stone-game-viii.py
2039	Sum Game		Python	sum-game.py
2106	Find Greatest Common Divisor of Array		Python	find-greatest-common-divisor-of-array.py
2156	Stone Game IX		Python	stone-game-ix.py
2182	Find the Minimum and Maximum Number of Nodes Between Critical Points		Python	find-the-minimum-and-maximum-number-of-nodes-between-critical-points.py
2212	Removing Minimum and Maximum From Array		Python	removing-minimum-and-maximum-from-array.py
2319	Longest Substring of One Repeating Character		Python	longest-substring-of-one-repeating-character.py
2347	Count Nodes Equal to Average of Subtree		Python	count-nodes-equal-to-average-of-subtree.py
2582	Minimum Score of a Path Between Two Cities		Python	minimum-score-of-a-path-between-two-cities.py
2793	Count the Number of Complete Components		Python	count-the-number-of-complete-components.py
2914	Find the Safest Path in a Grid		Python	find-the-safest-path-in-a-grid.py
3150	Shortest and Lexicographically Smallest Beautiful String		Python	shortest-and-lexicographically-smallest-beautiful-string.py
3219	Make Lexicographically Smallest Array by Swapping Elements		Python	make-lexicographically-smallest-array-by-swapping-elements.py
3225	Length of Longest Subarray With at Most K Frequency		Python	length-of-longest-subarray-with-at-most-k-frequency.py
3236	Smallest Missing Integer Greater Than Sequential Prefix Sum		Python	README.md
3275	Minimum Number of Pushes to Type Word I		Python	minimum-number-of-pushes-to-type-word-i.py
3276	Minimum Number of Pushes to Type Word II		Python	minimum-number-of-pushes-to-type-word-ii.py
3349	Maximum Length Substring With Two Occurrences		Python	maximum-length-substring-with-two-occurrences.py
3375	Kth Smallest Amount With Single Denomination Combination		Python	kth-smallest-amount-with-single-denomination-combination.py
3558	Find a Safe Walk Through a Grid		Python	find-a-safe-walk-through-a-grid.py
3561	Remove Methods From Project		Python	remove-methods-from-project.py
3562	Maximum Score of Non-overlapping Intervals		Python	maximum-score-of-non-overlapping-intervals.py
3583	Sorted GCD Pair Queries		Python	sorted-gcd-pair-queries.py
3584	Find the Lexicographically Smallest Valid Sequence		Python	find-the-lexicographically-smallest-valid-sequence.py
3608	Find the Number of Subsequences With Equal GCD		Python	find-the-number-of-subsequences-with-equal-gcd.py
3626	Smallest Divisible Digit Product I		Python	smallest-divisible-digit-product-i.py
3635	Smallest Divisible Digit Product II		Python	smallest-divisible-digit-product-ii.py
3705	Find the Largest Almost Missing Integer		Python	find-the-largest-almost-missing-integer.py
3799	Unique 3-Digit Even Numbers		Python	unique-3-digit-even-numbers.py
3804	Maximize Active Section with Trade II		Python	maximize-active-section-with-trade-ii.py
3805	Maximize Active Section with Trade I		Python	maximize-active-section-with-trade-i.py
3812	Smallest Palindromic Rearrangement I		Python	smallest-palindromic-rearrangement-i.py
3813	Smallest Palindromic Rearrangement II		Python	smallest-palindromic-rearrangement-ii.py
3820	Number of Unique XOR Triplets II		Python	number-of-unique-xor-triplets-ii.py
3824	Number of Unique XOR Triplets I		Python	number-of-unique-xor-triplets-i.py
3838	Path Existence Queries in a Graph I		Python	path-existence-queries-in-a-graph-i.py
3852	Path Existence Queries in a Graph II		Python	README.md
3859	Maximum Product of Two Digits		Python	maximum-product-of-two-digits.py
3870	Minimum Moves to Clean the Classroom		Python	minimum-moves-to-clean-the-classroom.py
3918	Check Divisibility by Digit Sum and Product		Python	check-divisibility-by-digit-sum-and-product.py
3995	GCD of Odd and Even Sums		Python	gcd-of-odd-and-even-sums.py
4020	Lexicographically Smallest Permutation Greater Than Target		Python	lexicographically-smallest-permutation-greater-than-target.py
4033	Longest Subsequence With Non-Zero Bitwise XOR		Python	longest-subsequence-with-non-zero-bitwise-xor.py
4037	Lexicographically Smallest Palindromic Permutation Greater Than Target		Python	lexicographically-smallest-palindromic-permutation-greater-than-target.py
4080	Smallest Missing Multiple of K		Python	smallest-missing-multiple-of-k.py
4107	Find Missing Elements		Python	find-missing-elements.py
4135	Concatenate Non-Zero Digits and Multiply by Sum I		Python	concatenate-non-zero-digits-and-multiply-by-sum-i.py
4136	Concatenate Non-Zero Digits and Multiply by Sum II		Python	concatenate-non-zero-digits-and-multiply-by-sum-ii.py
4203	Count of Unfinished Tasks After Each Shift		Python	count-of-unfinished-tasks-after-each-shift.py
4242	Sum of GCD of Formed Pairs		Python	sum-of-gcd-of-formed-pairs.py
4245	Count Commas in Range		Python	count-commas-in-range.py
4248	Count Commas in Range II		Python	README.md
4256	Construct Uniform Parity Array I		Python	construct-uniform-parity-array-i.py
4258	Construct Uniform Parity Array II		Python	construct-uniform-parity-array-ii.py
4284	Smallest Stable Index I		Python	smallest-stable-index-i.py
4285	Smallest Stable Index II		Python	smallest-stable-index-ii.py
4323	Count Subarrays With Even Odd Ratio I		Python	count-subarrays-with-even-odd-ratio-i.py
4324	Count Subarrays With Even Odd Ratio II		Python	count-subarrays-with-even-odd-ratio-ii.py
4371	Maximize Pair Strength Using GCD		Python	maximize-pair-strength-using-gcd.py