🚀 LeetCode Solutions

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📊 Statistics

Metric	Count
Problems Solved	46
Easy	13
Medium	23
Hard	6
Languages	C, C++, Java, Python3
Last Sync	03 Nov 2026

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📂 Browse by Topic

Array (25)

#	Problem	Difficulty	Solution
0748	Largest Number At Least Twice of Others	🟢 Easy	View
1039	Find the Town Judge	🟢 Easy	View
2301	Count Array Pairs Divisible by K	🔴 Hard	View
0054	Spiral Matrix	🟡 Medium	View
0391	Perfect Rectangle	🔴 Hard	View
1428	Jump Game III	🟡 Medium	View
2418	Minimum Sum of Squared Difference	🟡 Medium	View
2844	Sum of Squares of Special Elements	🟢 Easy	View
0692	Top K Frequent Words	🟡 Medium	View
0169	Majority Element	🟢 Easy	View
3153	Apply Operations on Array to Maximize Sum of Squares	🔴 Hard	View
4078	Maximum Alternating Sum of Squares	🟡 Medium	View
3163	Subarrays Distinct Element Sum of Squares I	🟢 Easy	View
3193	Maximum Strong Pair XOR I	🟢 Easy	View
3139	Subarrays Distinct Element Sum of Squares II	🔴 Hard	View
3847	Minimum Swaps to Sort by Digit Sum	🟡 Medium	View
1692	Number of Ways to Reorder Array to Get Same BST	🔴 Hard	View
2210	Find Target Indices After Sorting Array	🟢 Easy	View
4184	Minimum Operations to Sort a Permutation	🟡 Medium	View
3950	Maximum K to Sort a Permutation	🟡 Medium	View
1380	Number of Closed Islands	🟡 Medium	View
3823	Count Islands With Total Value Divisible by K	🟡 Medium	View
4205	Minimum XOR Path in a Grid	🟡 Medium	View
3938	Twisted Mirror Path Count	🟡 Medium	View
0462	Minimum Moves to Equal Array Elements II	🟡 Medium	View

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Backtracking (1)

#	Problem	Difficulty	Solution
0301	Remove Invalid Parentheses	🔴 Hard	View

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Binary Indexed Tree (1)

#	Problem	Difficulty	Solution
3139	Subarrays Distinct Element Sum of Squares II	🔴 Hard	View

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Binary Search (2)

#	Problem	Difficulty	Solution
2418	Minimum Sum of Squared Difference	🟡 Medium	View
2210	Find Target Indices After Sorting Array	🟢 Easy	View

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Binary Search Tree (1)

#	Problem	Difficulty	Solution
1692	Number of Ways to Reorder Array to Get Same BST	🔴 Hard	View

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Binary Tree (1)

#	Problem	Difficulty	Solution
1692	Number of Ways to Reorder Array to Get Same BST	🔴 Hard	View

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Bit Manipulation (4)

#	Problem	Difficulty	Solution
3153	Apply Operations on Array to Maximize Sum of Squares	🔴 Hard	View
3193	Maximum Strong Pair XOR I	🟢 Easy	View
3950	Maximum K to Sort a Permutation	🟡 Medium	View
4205	Minimum XOR Path in a Grid	🟡 Medium	View

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Boyer–Moore Majority Vote Algorithm (1)

#	Problem	Difficulty	Solution
0169	Majority Element	🟢 Easy	View

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Bracket Sequences (5)

#	Problem	Difficulty	Solution
0678	Valid Parenthesis String	🟡 Medium	View
0886	Score of Parentheses	🟡 Medium	View
0957	Minimum Add to Make Parentheses Valid	🟡 Medium	View
1078	Remove Outermost Parentheses	🟢 Easy	View
1648	Minimum Insertions to Balance a Parentheses String	🟡 Medium	View

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Breadth-First Search (5)

#	Problem	Difficulty	Solution
0301	Remove Invalid Parentheses	🔴 Hard	View
2121	Find if Path Exists in Graph	🟢 Easy	View
1428	Jump Game III	🟡 Medium	View
1380	Number of Closed Islands	🟡 Medium	View
3823	Count Islands With Total Value Divisible by K	🟡 Medium	View

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Bucket Sort (2)

#	Problem	Difficulty	Solution
0451	Sort Characters By Frequency	🟡 Medium	View
0692	Top K Frequent Words	🟡 Medium	View

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Combinatorics (1)

#	Problem	Difficulty	Solution
1692	Number of Ways to Reorder Array to Get Same BST	🔴 Hard	View

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Counting (4)

#	Problem	Difficulty	Solution
2301	Count Array Pairs Divisible by K	🔴 Hard	View
0451	Sort Characters By Frequency	🟡 Medium	View
0692	Top K Frequent Words	🟡 Medium	View
0169	Majority Element	🟢 Easy	View

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Depth-First Search (4)

#	Problem	Difficulty	Solution
2121	Find if Path Exists in Graph	🟢 Easy	View
1428	Jump Game III	🟡 Medium	View
1380	Number of Closed Islands	🟡 Medium	View
3823	Count Islands With Total Value Divisible by K	🟡 Medium	View

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Divide and Conquer (2)

#	Problem	Difficulty	Solution
0169	Majority Element	🟢 Easy	View
1692	Number of Ways to Reorder Array to Get Same BST	🔴 Hard	View

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Dynamic Programming (4)

#	Problem	Difficulty	Solution
0678	Valid Parenthesis String	🟡 Medium	View
1692	Number of Ways to Reorder Array to Get Same BST	🔴 Hard	View
4205	Minimum XOR Path in a Grid	🟡 Medium	View
3938	Twisted Mirror Path Count	🟡 Medium	View

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Enumeration (1)

#	Problem	Difficulty	Solution
2844	Sum of Squares of Special Elements	🟢 Easy	View

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Euclidean Algorithm (1)

#	Problem	Difficulty	Solution
2301	Count Array Pairs Divisible by K	🔴 Hard	View

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Fermat's Little Theorem (1)

#	Problem	Difficulty	Solution
1692	Number of Ways to Reorder Array to Get Same BST	🔴 Hard	View

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Geometry (1)

#	Problem	Difficulty	Solution
0391	Perfect Rectangle	🔴 Hard	View

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Graph Theory (4)

#	Problem	Difficulty	Solution
1039	Find the Town Judge	🟢 Easy	View
1916	Find Center of Star Graph	🟢 Easy	View
2121	Find if Path Exists in Graph	🟢 Easy	View
4104	Shortest Path With At Most K Consecutive Identical Characters	🟡 Medium	View

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Greatest Common Divisor (1)

#	Problem	Difficulty	Solution
2301	Count Array Pairs Divisible by K	🔴 Hard	View

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Greedy (7)

#	Problem	Difficulty	Solution
0678	Valid Parenthesis String	🟡 Medium	View
0957	Minimum Add to Make Parentheses Valid	🟡 Medium	View
1648	Minimum Insertions to Balance a Parentheses String	🟡 Medium	View
2418	Minimum Sum of Squared Difference	🟡 Medium	View
3153	Apply Operations on Array to Maximize Sum of Squares	🔴 Hard	View
4078	Maximum Alternating Sum of Squares	🟡 Medium	View
4084	Maximize Sum of Squares of Digits	🟡 Medium	View

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Hash Table (11)

#	Problem	Difficulty	Solution
1039	Find the Town Judge	🟢 Easy	View
2301	Count Array Pairs Divisible by K	🔴 Hard	View
0391	Perfect Rectangle	🔴 Hard	View
0451	Sort Characters By Frequency	🟡 Medium	View
0692	Top K Frequent Words	🟡 Medium	View
0169	Majority Element	🟢 Easy	View
3153	Apply Operations on Array to Maximize Sum of Squares	🔴 Hard	View
3163	Subarrays Distinct Element Sum of Squares I	🟢 Easy	View
3193	Maximum Strong Pair XOR I	🟢 Easy	View
3139	Subarrays Distinct Element Sum of Squares II	🔴 Hard	View
3847	Minimum Swaps to Sort by Digit Sum	🟡 Medium	View

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Heap (Priority Queue) (4)

#	Problem	Difficulty	Solution
2418	Minimum Sum of Squared Difference	🟡 Medium	View
0451	Sort Characters By Frequency	🟡 Medium	View
0692	Top K Frequent Words	🟡 Medium	View
4104	Shortest Path With At Most K Consecutive Identical Characters	🟡 Medium	View

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Linked List (1)

#	Problem	Difficulty	Solution
0061	Rotate List	🟡 Medium	View

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Math (7)

#	Problem	Difficulty	Solution
2301	Count Array Pairs Divisible by K	🔴 Hard	View
0391	Perfect Rectangle	🔴 Hard	View
4084	Maximize Sum of Squares of Digits	🟡 Medium	View
1692	Number of Ways to Reorder Array to Get Same BST	🔴 Hard	View
0507	Perfect Number	🟢 Easy	View
2496	Count Days Spent Together	🟢 Easy	View
0462	Minimum Moves to Equal Array Elements II	🟡 Medium	View

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Matrix (5)

#	Problem	Difficulty	Solution
0054	Spiral Matrix	🟡 Medium	View
1380	Number of Closed Islands	🟡 Medium	View
3823	Count Islands With Total Value Divisible by K	🟡 Medium	View
4205	Minimum XOR Path in a Grid	🟡 Medium	View
3938	Twisted Mirror Path Count	🟡 Medium	View

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Memoization (1)

#	Problem	Difficulty	Solution
1692	Number of Ways to Reorder Array to Get Same BST	🔴 Hard	View

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Number Theory (1)

#	Problem	Difficulty	Solution
2301	Count Array Pairs Divisible by K	🔴 Hard	View

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Segment Tree (2)

#	Problem	Difficulty	Solution
3163	Subarrays Distinct Element Sum of Squares I	🟢 Easy	View
3139	Subarrays Distinct Element Sum of Squares II	🔴 Hard	View

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Shortest Path (1)

#	Problem	Difficulty	Solution
4104	Shortest Path With At Most K Consecutive Identical Characters	🟡 Medium	View

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Simulation (1)

#	Problem	Difficulty	Solution
0054	Spiral Matrix	🟡 Medium	View

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Sliding Window (1)

#	Problem	Difficulty	Solution
3193	Maximum Strong Pair XOR I	🟢 Easy	View

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Sorting (9)

#	Problem	Difficulty	Solution
0748	Largest Number At Least Twice of Others	🟢 Easy	View
2418	Minimum Sum of Squared Difference	🟡 Medium	View
0451	Sort Characters By Frequency	🟡 Medium	View
0692	Top K Frequent Words	🟡 Medium	View
0169	Majority Element	🟢 Easy	View
4078	Maximum Alternating Sum of Squares	🟡 Medium	View
3847	Minimum Swaps to Sort by Digit Sum	🟡 Medium	View
2210	Find Target Indices After Sorting Array	🟢 Easy	View
0462	Minimum Moves to Equal Array Elements II	🟡 Medium	View

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Stack (5)

#	Problem	Difficulty	Solution
0678	Valid Parenthesis String	🟡 Medium	View
0886	Score of Parentheses	🟡 Medium	View
0957	Minimum Add to Make Parentheses Valid	🟡 Medium	View
1078	Remove Outermost Parentheses	🟢 Easy	View
1648	Minimum Insertions to Balance a Parentheses String	🟡 Medium	View

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String (12)

#	Problem	Difficulty	Solution
0678	Valid Parenthesis String	🟡 Medium	View
0886	Score of Parentheses	🟡 Medium	View
0957	Minimum Add to Make Parentheses Valid	🟡 Medium	View
0301	Remove Invalid Parentheses	🔴 Hard	View
1078	Remove Outermost Parentheses	🟢 Easy	View
1648	Minimum Insertions to Balance a Parentheses String	🟡 Medium	View
0451	Sort Characters By Frequency	🟡 Medium	View
0692	Top K Frequent Words	🟡 Medium	View
4220	Minimum Operations to Sort a String	🟡 Medium	View
0006	Zigzag Conversion	🟡 Medium	View
2496	Count Days Spent Together	🟢 Easy	View
4104	Shortest Path With At Most K Consecutive Identical Characters	🟡 Medium	View

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Sweep Line (1)

#	Problem	Difficulty	Solution
0391	Perfect Rectangle	🔴 Hard	View

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Tree (1)

#	Problem	Difficulty	Solution
1692	Number of Ways to Reorder Array to Get Same BST	🔴 Hard	View

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Trie (2)

#	Problem	Difficulty	Solution
0692	Top K Frequent Words	🟡 Medium	View
3193	Maximum Strong Pair XOR I	🟢 Easy	View

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Two Pointers (1)

#	Problem	Difficulty	Solution
0061	Rotate List	🟡 Medium	View

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Uncategorized (5)

#	Problem	Difficulty	Solution
4070	Minimum Rotations to Dial a Number I	⚪ Unknown	View
4073	Count Good Strings	⚪ Unknown	View
101198	Longest Resilient Subarray I	⚪ Unknown	View
4086	Minimum Interval Selection to Cover Target Intervals	⚪ Unknown	View
4342	Create Grid With Exactly One Path	🟢 Easy	View

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Union-Find (4)

#	Problem	Difficulty	Solution
2121	Find if Path Exists in Graph	🟢 Easy	View
1692	Number of Ways to Reorder Array to Get Same BST	🔴 Hard	View
1380	Number of Closed Islands	🟡 Medium	View
3823	Count Islands With Total Value Divisible by K	🟡 Medium	View

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🔥 Recently Solved

Date	Problem	Difficulty	Language
03 Nov 2026	Minimum Moves to Equal Array Elements II	🟡 Medium	C++
01 Nov 2026	Twisted Mirror Path Count	🟡 Medium	C++
30 Oct 2026	Shortest Path With At Most K Consecutive Identical Characters	🟡 Medium	C++
29 Oct 2026	Minimum XOR Path in a Grid	🟡 Medium	C++
28 Oct 2026	Create Grid With Exactly One Path	🟢 Easy	C++
27 Oct 2026	Count Islands With Total Value Divisible by K	🟡 Medium	C++
26 Oct 2026	Number of Closed Islands	🟡 Medium	C++
24 Oct 2026	Count Days Spent Together	🟢 Easy	C++
23 Oct 2026	Perfect Number	🟢 Easy	Python3
23 Oct 2026	Zigzag Conversion	🟡 Medium	C++

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