LeetSpace

LeetSpace serves as a dedicated workspace and archive for my LeetCode submissions.

Problems

Problem	Difficulty	Solution
1. Two Sum	Easy	C C++
3. Longest Substring Without Repeating Characters	Medium	C++
4. Median of Two Sorted Arrays	Hard	C++
5. Longest Palindromic Substring	Medium	C C++
6. Zigzag Conversion	Medium	C C++
8. String to Integer (atoi)	Medium	C++
9. Palindrome Number	Easy	C++
10. Regular Expression Matching	Hard	C C++
11. Container With Most Water	Medium	C++
12. Integer to Roman	Medium	C C++
13. Roman to Integer	Easy	C C++
15. 3Sum	Medium	C++
16. 3Sum Closest	Medium	C C++
17. Letter Combinations of a Phone Number	Medium	C++
18. 4Sum	Medium	C C++
19. Remove Nth Node From End of List	Medium	C++
22. Generate Parentheses	Medium	C C++
23. Merge k Sorted Lists	Hard	C++
24. Swap Nodes in Pairs	Medium	C++
25. Reverse Nodes in k-Group	Hard	C++
26. Remove Duplicates from Sorted Array	Easy	C++
27. Remove Element	Easy	C++
28. Find the Index of the First Occurrence in a String	Easy	C++
31. Next Permutation	Medium	C++
34. Find First and Last Position of Element in Sorted Array	Medium	C++
35. Search Insert Position	Easy	C++
36. Valid Sudoku	Medium	C C++
39. Combination Sum	Medium	C++
40. Combination Sum II	Medium	C C++
41. First Missing Positive	Hard	C C++
46. Permutations	Medium	C C++
49. Group Anagrams	Medium	C++
53. Maximum Subarray	Medium	C C++
55. Jump Game	Medium	C++
57. Insert Interval	Medium	C C++
58. Length of Last Word	Easy	C C++
59. Spiral Matrix II	Medium	C C++
66. Plus One	Easy	C++
67. Add Binary	Easy	C C++
70. Climbing Stairs	Easy	C C++
75. Sort Colors	Medium	C++
78. Subsets	Medium	C++
79. Word Search	Medium	C C++
88. Merge Sorted Array	Easy	C++
91. Decode Ways	Medium	C C++
94. Binary Tree Inorder Traversal	Easy	C++
100. Same Tree	Easy	C++
119. Pascal's Triangle II	Easy	C++
120. Triangle	Medium	C C++
121. Best Time to Buy and Sell Stock	Easy	C C++
125. Valid Palindrome	Easy	C C++
129. Sum Root to Leaf Numbers	Medium	C++
131. Palindrome Partitioning	Medium	C++
136. Single Number	Easy	C C++
137. Single Number II	Medium	C C++
140. Word Break II	Hard	C++
141. Linked List Cycle	Easy	C++
143. Reorder List	Medium	C++
150. Evaluate Reverse Polish Notation	Medium	C C++
151. Reverse Words in a String	Medium	C C++
165. Compare Version Numbers	Medium	C C++
169. Majority Element	Easy	C C++
191. Number of 1 Bits	Easy	C C++
198. House Robber	Medium	C C++
200. Number of Islands	Medium	C C++
201. Bitwise AND of Numbers Range	Medium	C C++
204. Count Primes	Medium	C C++
205. Isomorphic Strings	Easy	C C++
206. Reverse Linked List	Easy	C++
228. Summary Ranges	Easy	C C++
229. Majority Element II	Medium	C++
231. Power of Two	Easy	C C++
232. Implement Queue using Stacks	Easy	C++
234. Palindrome Linked List	Easy	C++
237. Delete Node in a Linked List	Medium	C++
238. Product of Array Except Self	Medium	C C++
242. Valid Anagram	Easy	C C++
258. Add Digits	Easy	C C++
260. Single Number III	Medium	C C++
263. Ugly Number	Easy	C C++
264. Ugly Number II	Medium	C C++
268. Missing Number	Easy	C C++
273. Integer to English Words	Hard	C C++
275. H-Index II	Medium	C C++
278. First Bad Version	Easy	C++
279. Perfect Squares	Medium	C C++
287. Find the Duplicate Number	Medium	C C++
299. Bulls and Cows	Medium	C C++
300. Longest Increasing Subsequence	Medium	C C++
303. Range Sum Query - Immutable	Easy	C++
310. Minimum Height Trees	Medium	C C++
316. Remove Duplicate Letters	Medium	C++
330. Patching Array	Hard	C C++
342. Power of Four	Easy	C C++
343. Integer Break	Medium	C++
344. Reverse String	Easy	C++
345. Reverse Vowels of a String	Easy	C C++
349. Intersection of Two Arrays	Easy	C C++
350. Intersection of Two Arrays II	Easy	C C++
355. Design Twitter	Medium	C++
368. Largest Divisible Subset	Medium	C++
380. Insert Delete GetRandom O(1)	Medium	C++
387. First Unique Character in a String	Easy	C C++
389. Find the Difference	Easy	C++
392. Is Subsequence	Easy	C++
404. Sum of Left Leaves	Easy	C++
409. Longest Palindrome	Easy	C C++
412. Fizz Buzz	Easy	C C++
441. Arranging Coins	Easy	C C++
442. Find All Duplicates in an Array	Medium	C C++
446. Arithmetic Slices II - Subsequence	Hard	C++
451. Sort Characters By Frequency	Medium	C++
452. Minimum Number of Arrows to Burst Balloons	Medium	C C++
454. 4Sum II	Medium	C++
455. Assign Cookies	Easy	C C++
456. 132 Pattern	Medium	C C++
458. Poor Pigs	Hard	C C++
463. Island Perimeter	Easy	C C++
485. Max Consecutive Ones	Easy	C++
502. IPO	Hard	C C++
506. Relative Ranks	Easy	C C++
513. Find Bottom Left Tree Value	Medium	C++
514. Freedom Trail	Hard	C C++
523. Continuous Subarray Sum	Medium	C C++
525. Contiguous Array	Medium	C++
541. Reverse String II	Easy	C C++
543. Diameter of Binary Tree	Easy	C++
557. Reverse Words in a String III	Easy	C C++
576. Out of Boundary Paths	Medium	C++
587. Erect the Fence	Hard	C++
606. Construct String from Binary Tree	Easy	C++
611. Valid Triangle Number	Medium	C C++
621. Task Scheduler	Medium	C C++
623. Add One Row to Tree	Medium	C++
624. Maximum Distance in Arrays	Medium	C C++
628. Maximum Product of Three Numbers	Easy	C++
633. Sum of Square Numbers	Medium	C C++
645. Set Mismatch	Easy	C C++
647. Palindromic Substrings	Medium	C C++
648. Replace Words	Medium	C++
650. 2 Keys Keyboard	Medium	C C++
657. Robot Return to Origin	Easy	C C++
661. Image Smoother	Easy	C++
664. Strange Printer	Hard	C++
678. Valid Parenthesis String	Medium	C C++
680. Valid Palindrome II	Easy	C C++
703. Kth Largest Element in a Stream	Easy	C++
713. Subarray Product Less Than K	Medium	C C++
719. Find K-th Smallest Pair Distance	Hard	C C++
726. Number of Atoms	Hard	C++
739. Daily Temperatures	Medium	C C++
746. Min Cost Climbing Stairs	Easy	C++
752. Open the Lock	Medium	C C++
779. K-th Symbol in Grammar	Medium	C C++
786. K-th Smallest Prime Fraction	Medium	C C++
791. Custom Sort String	Medium	C C++
796. Rotate String	Easy	C C++
812. Largest Triangle Area	Easy	C C++
815. Bus Routes	Hard	C++
823. Binary Trees With Factors	Medium	C++
826. Most Profit Assigning Work	Medium	C C++
834. Sum of Distances in Tree	Hard	C C++
840. Magic Squares In Grid	Medium	C C++
844. Backspace String Compare	Easy	C++
846. Hand of Straights	medium	C C++
857. Minimum Cost to Hire K Workers	Hard	C++
860. Lemonade Change	Easy	C C++
861. Score After Flipping Matrix	Medium	C C++
867. Transpose Matrix	Easy	C C++
872. Leaf-Similar Trees	Easy	C++
875. Koko Eating Bananas	Medium	C C++
876. Middle of the Linked List	Easy	C++
880. Decoded String at Index	Medium	C++
881. Boats to Save People	Medium	C C++
885. Spiral Matrix III	Medium	C C++
888. Fair Candy Swap	Easy	C C++
905. Sort Array By Parity	Easy	C++
908. Smallest Range I	Easy	C C++
909. Snakes and Ladders	Medium	C C++
912. Sort an Array	Medium	C C++
925. Long Pressed Name	Easy	C C++
929. Unique Email Addresses	Easy	C C++
930. Binary Subarrays With Sum	Medium	C++
931. Minimum Falling Path Sum	Medium	C++
933. Number of Recent Calls	Easy	C++
934. Shortest Bridge	Medium	C C++
935. Knight Dialer	Easy	C C++
938. Range Sum of BST	Easy	C++
945. Minimum Increment to Make Array Unique	Medium	C C++
948. Bag of Tokens	Medium	C C++
959. Regions Cut By Slashes	Medium	C C++
974. Subarray Sums Divisible by K	Medium	C C++
976. Largest Perimeter Triangle	Easy	C C++
977. Squares of a Sorted Array	Easy	C C++
979. Distribute Coins in Binary Tree	Medium	C++
988. Smallest String Starting From Leaf	Medium	C++
992. Subarrays with K Different Integers	Hard	C++
995. Minimum Number of K Consecutive Bit Flips	Hard	C C++
997. Find the Town Judge	Easy	C C++
1002. Find Common Characters	Easy	C C++
1025. Divisor Game	Easy	C C++
1026. Maximum Difference Between Node and Ancestor	Medium	C++
1038. Binary Search Tree to Greater Sum Tree	Medium	C++
1043. Partition Array for Maximum Sum	Medium	C C++
1046. Last Stone Weight	Easy	C C++
1047. Remove All Adjacent Duplicates In String	Medium	C C++
1048. Longest String Chain	Medium	C++
1051. Height Checker	Easy	C C++
1052. Grumpy Bookstore Owner	Medium	C C++
1071. Greatest Common Divisor of Strings	Easy	C C++
1081. Smallest Subsequence of Distinct Characters	Medium	C++
1090. Largest Values From Labels	Medium	C C++
1105. Filling Bookcase Shelves	Medium	C C++
1109. Corporate Flight Bookings	Medium	C C++
1110. Delete Nodes And Return Forest	Medium	C++
1122. Relative Sort Array	Easy	C C++
1137. N-th Tribonacci Number	Easy	C C++
1140. Stone Game II	Medium	C C++
1143. Longest Common Subsequence	Medium	C C++
1160. Find Words That Can Be Formed by Characters	Easy	C C++
1170. Compare Strings by Frequency of the Smallest Character	Medium	C++
1175. Prime Arrangements	Easy	C C++
1184. Distance Between Bus Stops	Easy	C C++
1190. Reverse Substrings Between Each Pair of Parentheses	Medium	C C++
1195. Fizz Buzz Multithreaded	Medium	C++
1207. Unique Number of Occurrences	Easy	C++
1208. Get Equal Substrings Within Budget	Medium	C C++
1209. Remove All Adjacent Duplicates in String II	Medium	C C++
1219. Path with Maximum Gold	Medium	C C++
1220. Count Vowels Permutation	Hard	C C++
1232. Check If It Is a Straight Line	Easy	C++
1235. Maximum Profit in Job Scheduling	Hard	C++
1239. Maximum Length of a Concatenated String with Unique Characters	Medium	C C++
1247. Minimum Swaps to Make Strings Equal	Medium	C C++
1248. Count Number of Nice Subarrays	Medium	C C++
1253. Reconstruct a 2-Row Binary Matrix	Medium	C C++
1255. Maximum Score Words Formed by Letters	Hard	C C++
1266. Minimum Time Visiting All Points	Easy	C C++
1269. Number of Ways to Stay in the Same Place After Some Steps	Hard	C++
1275. Find Winner on a Tic Tac Toe Game	Easy	C C++
1287. Element Appearing More Than 25% In Sorted Array	Easy	C C++
1289. Minimum Falling Path Sum II	Hard	C C++
1291. Sequential Digits	Medium	C C++
1299. Replace Elements with Greatest Element on Right Side	Easy	C C++
1309. Decrypt String from Alphabet to Integer Mapping	Easy	C C++
1325. Delete Leaves With a Given Value	Medium	C++
1329. Sort the Matrix Diagonally	Medium	C C++
1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance	Medium	C C++
1337. The K Weakest Rows in a Matrix	Easy	C++
1347. Minimum Number of Steps to Make Two Strings Anagram	Medium	C C++
1348. Tweet Counts Per Frequency	Medium	C++
1353. Maximum Number of Events That Can Be Attended	Medium	C++
1356. Sort Integers by The Number of 1 Bits	Easy	C++
1357. Apply Discount Every n Orders	Medium	C++
1361. Validate Binary Tree Nodes	Medium	C C++
1366. Rank Teams by Votes	Medium	C C++
1380. Lucky Numbers in a Matrix	Easy	C C++
1382. Balance a Binary Search Tree	Medium	C++
1395. Count Number of Teams	Medium	C C++
1404. Number of Steps to Reduce a Number in Binary Representation to One	Medium	C C++
1419. Minimum Number of Frogs Croaking	Medium	C C++
1422. Maximum Score After Splitting a String	Easy	C C++
1424. Diagonal Traverse II	Medium	C++
1425. Constrained Subsequence Sum	Hard	C++
1436. Destination City	Easy	C++
1437. Check If All 1's Are at Least Length K Places Away	Easy	C C++
1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Medium	C C++
1441. Build an Array With Stack Operations	Medium	C++
1442. Count Triplets That Can Form Two Arrays of Equal XOR	Medium	C C++
1457. Pseudo-Palindromic Paths in a Binary Tree	Medium	C++
1458. Max Dot Product of Two Subsequences	Hard	C++
1464. Maximum Product of Two Elements in an Array	Easy	C C++
1481. Least Number of Unique Integers after K Removals	Medium	C++
1482. Minimum Number of Days to Make m Bouquets	Medium	C C++
1496. Path Crossing	Easy	C++
1503. Last Moment Before All Ants Fall Out of a Plank	Medium	C C++
1507. Reformat Date	Easy	C C++
1508. Range Sum of Sorted Subarray Sums	Medium	C C++
1509. Minimum Difference Between Largest and Smallest Value in Three Moves	Medium	C C++
1512. Number of Good Pairs	Easy	C C++
1518. Water Bottles	Easy	C C++
1530. Number of Good Leaf Nodes Pairs	Medium	C++
1534. Count Good Triplets	Easy	C C++
1535. Find the Winner of an Array Game	Medium	C C++
1544. Make The String Great	Easy	C C++
1550. Three Consecutive Odds	Easy	C C++
1552. Magnetic Force Between Two Balls	Medium	C C++
1561. Maximum Number of Coins You Can Get	Medium	C C++
1566. Detect Pattern of Length M Repeated K or More Times	Easy	C C++
1578. Minimum Time to Make Rope Colorful	Medium	C++
1579. Remove Max Number of Edges to Keep Graph Fully Traversable	Hard	C C++
1582. Special Positions in a Binary Matrix	Easy	C C++
1598. Crawler Log Folder	Easy	C C++
1600. Throne Inheritance	Medium	C++
1605. Find Valid Matrix Given Row and Column Sums	Medium	C C++
1608. Special Array With X Elements Greater Than or Equal X	Easy	C C++
1609. Even Odd Tree	Medium	C++
1611. Minimum One Bit Operations to Make Integers Zero	Hard	C C++
1614. Maximum Nesting Depth of the Parentheses	Easy	C++ C
1624. Largest Substring Between Two Equal Characters	Easy	C C++
1630. Arithmetic Subarrays	Medium	C C++
1636. Sort Array by Increasing Frequency	Easy	C C++
1637. Widest Vertical Area Between Two Points Containing No Points	Medium	C C++
1642. Furthest Building You Can Reach	Medium	C++
1652. Defuse the Bomb	Medium	C C++
1653. Minimum Deletions to Make String Balanced	Medium	C C++
1657. Determine if Two Strings Are Close	Medium	C C++
1658. Minimum Operations to Reduce X to Zero	Medium	C++
1662. Check If Two String Arrays are Equivalent	Easy	C C++
1668. Maximum Repeating Substring	Easy	C C++
1669. Merge In Between Linked Lists	Medium	C++
1685. Sum of Absolute Differences in a Sorted Array	Medium	C C++
1688. Count of Matches in Tournament	Easy	C C++
1700. Number of Students Unable to Eat Lunch	Easy	C C++
1701. Average Waiting Time	Medium	C C++
1704. Determine if String Halves Are Alike	Easy	C C++
1716. Calculate Money in Leetcode Bank	Easy	C C++
1717. Maximum Score From Removing Substrings	Medium	C C++
1723. Find Minimum Time to Finish All Jobs	Hard	C++
1727. Largest Submatrix With Rearrangements	Medium	C C++
1743. Restore the Array From Adjacent Pairs	Medium	C++
1749. Maximum Absolute Sum of Any Subarray	Medium	C C++
1750. Minimum Length of String After Deleting Similar Ends	Medium	C C++
1758. Minimum Changes To Make Alternating Binary String	Easy	C C++
1759. Count Number of Homogenous Substrings	Medium	C C++
1770. Maximum Score from Performing Multiplication Operations	Hard	C++
1791. Find Center of Star Graph	Easy	C C++
1793. Maximum Score of a Good Subarray	Hard	C C++
1814. Count Nice Pairs in an Array	Medium	C++
1823. Find the Winner of the Circular Game	Medium	C C++
1838. Frequency of the Most Frequent Element	Medium	C++
1846. Maximum Element After Decreasing and Rearranging	Medium	C C++
1863. Sum of All Subset XOR Totals	Easy	C C++
1876. Substrings of Size Three with Distinct Characters	Easy	C C++
1877. Minimize Maximum Pair Sum in Array	Medium	C++ C++
1887. Reduction Operations to Make the Array Elements Equal	Medium	C C++
1895. Largest Magic Square	Medium	C C++
1897. Redistribute Characters to Make All Strings Equal	Easy	C C++
1903. Largest Odd Number in String	Easy	C C++
1913. Maximum Product Difference Between Two Pairs	Easy	C C++
1915. Number of Wonderful Substrings	Medium	C C++
1921. Eliminate Maximum Number of Monsters	Medium	C C++
1930. Unique Length-3 Palindromic Subsequences	Medium	C C++
1936. Add Minimum Number of Rungs	Medium	C C++
1937. Maximum Number of Points with Cost	Medium	C C++
1971. Find if Path Exists in Graph	Easy	C C++
1980. Find Unique Binary String	Medium	C++
1992. Find All Groups of Farmland	Medium	C C++
1995. Count Special Quadruplets	Easy	C C++
2000. Reverse Prefix of Word	Easy	C C++
2009. Minimum Number of Operations to Make Array Continuous	Hard	C++
2018. Check if Word Can Be Placed In Crossword	Medium	C C++
2037. Minimum Number of Moves to Seat Everyone	Easy	C C++
2038. Remove Colored Pieces if Both Neighbors are the Same Color	Medium	C C++
2050. Parallel Courses III	Hard	C++
2053. Kth Distinct String in an Array	Easy	C++
2058. Find the Minimum and Maximum Number of Nodes Between Critical Points	Medium	C++
2073. Time Needed to Buy Tickets	Easy	C C++
2096. Step-By-Step Directions From a Binary Tree Node to Another	Medium	C++
2108. Find First Palindromic String in the Array	Easy	C C++
2124. Check if All A's Appears Before All B's	Easy	C C++
2125. Number of Laser Beams in a Bank	Medium	C C++
2134. Minimum Swaps to Group All 1's Together II	Medium	C C++
2135. Count Words Obtained After Adding a Letter	Medium	C C++
2144. Minimum Cost of Buying Candies With Discount	Easy	C C++
2147. Number of Ways to Divide a Long Corridor	Hard	C C++
2149. Rearrange Array Elements by Sign	Medium	C C++
2181. Merge Nodes in Between Zeros	Medium	C++
2192. All Ancestors of a Node in a Directed Acyclic Graph	Medium	C++
2196. Create Binary Tree From Descriptions	Medium	C++
2197. Replace Non-Coprime Numbers in Array	Hard	C++
2211. Count Collisions on a Road	Medium	C++
2225. Find Players With Zero or One Losses	Medium	C++
2235. Add Two Integers	Easy	C C++
2251. Number of Flowers in Full Bloom	Hard	C++
2264. Largest 3-Same-Digit Number in String	Easy	C C++
2285. Maximum Total Importance of Roads	Medium	C C++
2326. Spiral Matrix IV	Medium	C++
2331. Evaluate Boolean Binary Tree	Easy	C++
2353. Design a Food Rating System	Medium	C++
2370. Longest Ideal Subsequence	Medium	C C++
2373. Largest Local Values in a Matrix	Easy	C C++
2380. Time Needed to Rearrange a Binary String	Medium	C C++
2385. Amount of Time for Binary Tree to Be Infected	Medium	C++
2391. Minimum Amount of Time to Collect Garbage	Medium	C C++
2418. Sort the People	Easy	C C++
2423. Remove Letter To Equalize Frequency	Easy	C C++
2424. Longest Uploaded Prefix	Medium	C++
2425. Bitwise XOR of All Pairings	Medium	C C++
2427. Number of Common Factors	Medium	C++
2433. Find The Original Array of Prefix Xor	Medium	C++
2441. Largest Positive Integer That Exists With Its Negative	Easy	C C++
2444. Count Subarrays With Fixed Bounds	Hard	C C++
2467. Most Profitable Path in a Tree	Medium	C C++
2482. Difference Between Ones and Zeros in Row and Column	Medium	C C++
2485. Find the Pivot Integer	Easy	C C++
2486. Append Characters to String to Make Subsequence	Medium	C C++
2487. Remove Nodes From Linked List	Medium	C++
2490. Circular Sentence	Easy	C C++
2497. Maximum Star Sum of a Graph	Medium	C++
2511. Maximum Enemy Forts That Can Be Captured	Easy	C C++
2525. Categorize Box According to Criteria	Easy	C C++
2531. Make Number of Distinct Characters Equal	Medium	C C++
2535. Difference Between Element Sum and Digit Sum of an Array	Easy	C C++
2540. Minimum Common Value	Easy	C C++
2544. Alternating Digit Sum	Easy	C C++
2545. Sort the Students by Their Kth Score	Medium	C C++
2582. Pass the Pillow	Easy	C C++
2597. The Number of Beautiful Subsets	Medium	C C++
2605. Form Smallest Number From Two Digit Arrays	Easy	C C++
2610. Convert an Array Into a 2D Array With Conditions	Medium	C++
2642. Design Graph With Shortest Path Calculator	Hard	C++
2678. Number of Senior Citizens	Easy	C C++
2698. Find the Punishment Number of an Integer	Medium	C C++
2706. Buy Two Chocolates	Easy	C C++
2742. Painting the Walls	Hard	C++
2751. Robot Collisions	Hard	C++
2770. Maximum Number of Jumps to Reach the Last Index	Medium	C C++
2785. Sort Vowels in a String	Medium	C C++
2810. Faulty Keyboard	Easy	C C++
2812. Find the Safest Path in a Grid	Medium	C++
2816. Double a Number Represented as a Linked List	Medium	C++
2849. Determine if a Cell Is Reachable at a Given Time	Medium	C C++
2864. Maximum Odd Binary Number	Easy	C C++
2870. Minimum Number of Operations to Make Array Empty	Medium	C++
2958. Length of Longest Subarray With at Most K Frequency	Medium	C++
2962. Count Subarrays Where Max Element Appears at Least K Times	Medium	C C++
2966. Divide Array Into Arrays With Max Difference	Medium	C C++
2971. Find Polygon With the Largest Perimeter	Medium	C C++
2997. Minimum Number of Operations to Make Array XOR Equal to K	Medium	C C++
2998. Minimum Number of Operations to Make X and Y Equal	Medium	C C++
3005. Count Elements With Maximum Frequency	Easy	C++
3007. Maximum Number That Sum of the Prices Is Less Than or Equal to K	Medium	C C++
3016. Minimum Number of Pushes to Type Word II	Medium	C C++
3065. Minimum Operations to Exceed Threshold Value I	Easy	C C++
3068. Find the Maximum Sum of Node Values	Hard	C C++
3075. Maximize Happiness of Selected Children	Medium	C C++
3110. Score of a String	Easy	C C++
3137. Minimum Number of Operations to Make Word K-Periodic	Medium	C++

License

This project is licensed under the terms of the MIT License.

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