LeetCode Problem of the Day Solutions

A collection of daily LeetCode problems with solutions.

Index

January 2025

• [Jan 1] 1422. Maximum_Score_After_Splitting_a_String
• [Jan 2] 2559. Count Vowel Strings in Ranges
• [Jan 3] 2270. Number of Ways to Split Array
• [Jan 4] 1930. Unique Length-3 Palindromic Subsequences
• [Jan 5] 2381. Shifting Letters II
• [Jan 6] 1769. Minimum Number of Operations to Move All Balls to Each Box
• [Jan 7] 1408. String Matching in an Array
• [Jan 8] 3042. Count Prefix and Suffix Pairs I
• [Jan 9] 2185. Counting Words With a Given Prefix
• [Jan 10] 916. Word Subsets
• [Jan 11] 1400. Construct K Palindrome Strings
• [Jan 12] 2116. Check if a Parentheses String Can Be Valid
• [Jan 13] 3223. Minimum Length of String After Operations
• [Jan 14] 2657. Find the Prefix Common Array of Two Arrays
• [Jan 15] 2429. Minimize XOR
• [Jan 16] 2425. Bitwise XOR of All Pairings
• [Jan 17] 2683. Neighboring Bitwise XOR
• [Jan 18] 1368. Minimum Cost to Make at Least One Valid Path in a Grid
• [Jan 19] 407. Trapping Rain Water II
• [Jan 20] 2661. First Completely Painted Row or Column
• [Jan 21] 2017. Grid Game
• [Jan 22] 1765. Map of Highest Peak
• [Jan 23] 1267. Count Servers that Communicate
• [Jan 24] 802. Find Eventual Safe States
• [Jan 25] 2948. Make Lexicographically Smallest Array by Swapping Elements
• [Jan 26] 2127. Maximum Employees to Be Invited to a Meeting
• [Jan 27] 1462. Course Schedule IV
• [Jan 28] 2658. Maximum Number of Fish in a Grid
• [Jan 29] 684. Redundant Connection
• [Jan 30] 2493. Divide Nodes Into the Maximum Number of Groups
• [Jan 31] 827. Making A Large Island

February 2025

• [Feb 1] 3151. Special Array I
• [Feb 2] 1752. Check if Array Is Sorted and Rotated
• [Feb 3] 3105. Longest Strictly Increasing or Strictly Decreasing Subarray
• [Feb 4] 1800. Maximum Ascending Subarray Sum4
• [Feb 5] 1790. Check if One String Swap Can Make Strings Equa
• [Feb 6] 1726. Tuple with Same Product
• [Feb 7] 3160. Find the Number of Distinct Colors Among the Balls
• [Feb 8] 2349. Design a Number Container System
• [Feb 9] 2364. Count Number of Bad Pairs
• [Feb 10] 3174. Clear Digits
• [Feb 11] 1910. Remove All Occurrences of a Substring
• [Feb 12] 2342. Max Sum of a Pair With Equal Sum of Digits
• [Feb 13] 3066. Minimum Operations to Exceed Threshold Value II
• [Feb 14] 1352. Product of the Last K Numbers
• [Feb 15] 2698. Find the Punishment Number of an Integer
• [Feb 16] 1718. Construct the Lexicographically Largest Valid Sequence
• [Feb 17] 1079. Letter Tile Possibilities
• [Feb 18] 2375. Construct Smallest Number From DI String
• [Feb 19] 1415. The k-th Lexicographical String of All Happy Strings of Length n
• [Feb 20] 1980. Find Unique Binary String
• [Feb 21] 1261. Find Elements in a Contaminated Binary Tree
• [Feb 22] 1028. Recover a Tree From Preorder Traversal
• [Feb 23] 889. Construct Binary Tree from Preorder and Postorder Traversal
• [Feb 24] 2467. Most Profitable Path in a Tree
• [Feb 25] 1524. Number of Sub-arrays With Odd Sum
• [Feb 26] 1749. Maximum Absolute Sum of Any Subarray
• [Feb 27] 873. Length of Longest Fibonacci Subsequence
• [Feb 28] 1092. Shortest Common Supersequence

March 2025

• [Mar 1] 2460. Apply Operations to an Array
• [Mar 2] 2570. Merge Two 2D Arrays by Summing Values
• [Mar 3] 2161. Partition Array According to Given Pivot
• [Mar 4] 1780. Check if Number is a Sum of Powers of Three
• [Mar 5] 2579. Count Total Number of Colored Cells
• [Mar 6] 2965. Find Missing and Repeated Values
• [Mar 7] 2523. Closest Prime Numbers in Range
• [Mar 8] 2379. Minimum Recolors to Get K Consecutive Black Blocks
• [Mar 9] 3208. Alternating Groups II
• [Mar 10] 3306. Count of Substrings Containing Every Vowel and K Consonants II
• [Mar 11] 1358. Number of Substrings Containing All Three Characters
• [Mar 12] 2529. Maximum Count of Positive Integer and Negative Integer
• [Mar 13] 3356. Zero Array Transformation II
• [Mar 14] 2226. Maximum Candies Allocated to K Children
• [Mar 15] 2560. House Robber IV
• [Mar 16] 2594. Minimum Time to Repair Cars
• [Mar 17] 2206. Divide Array Into Equal Pairs
• [Mar 18] 2401. Longest Nice Subarray
• [Mar 19] 3191. Minimum Operations to Make Binary Array Elements Equal to One I
• [Mar 20] 3108. Minimum Cost Walk in Weighted Graph
• [Mar 21] 2115. Find All Possible Recipes from Given Supplies
• [Mar 22] 2685. Count the Number of Complete Components
• [Mar 23] 1976. Number of Ways to Arrive at Destination
• [Mar 24] 3169. Count Days Without Meetings
• [Mar 25] 3394. Check if Grid can be Cut into Sections
• [Mar 26] 2033. Minimum Operations to Make a Uni-Value Grid
• [Mar 27] 2780. Minimum Index of a Valid Split
• [Mar 28] 2503. Maximum Number of Points From Grid Queries
• [Mar 29] 2818. Apply Operations to Maximize Score
• [Mar 30] 763. Partition Labels
• [Mar 31] 2551. Put Marbles in Bags

April 2025

• [Apr 1] 2140. Solving Questions With Brainpower
• [Apr 2] 2873. Maximum Value of an Ordered Triplet I
• [Apr 3] 2874. Maximum Value of an Ordered Triplet II
• [Apr 4] 1123. Lowest Common Ancestor of Deepest Leaves
• [Apr 5] 1863. Sum of All Subset XOR Totals
• [Apr 6] 368. Largest Divisible Subset
• [Apr 7] 416. Partition Equal Subset Sum
• [Apr 8] 3396. Minimum Number of Operations to Make Elements in Array Distinct
• [Apr 9] 3375. Minimum Operations to Make Array Values Equal to K
• [Apr 10] 2999. Count the Number of Powerful Integers
• [Apr 11] 2843. Count Symmetric Integers
• [Apr 12] 3272. Find the Count of Good Integers
• [Apr 13] 1922. Count Good Numbers
• [Apr 14] 1534. Count Good Triplets
• [Apr 15] 2179. Count Good Triplets in an Array
• [Apr 16] 2537. Count the Number of Good Subarrays
• [apr 17] 2176. Count Equal and Divisible Pairs in an Array
• [Apr 18] 38. Count and Say
• [Apr 19] 2563. Count the Number of Fair Pairs
• [Apr 20] 781. Rabbits in Forest
• [Apr 21] 2145. Count the Hidden Sequences
• [Apr 22] 2338. Count the Number of Ideal Arrays
• [Apr 23] 1399. Count Largest Group
• [Apr 24] 2799. Count Complete Subarrays in an Array
• [Apr 25] 2845. Count of Interesting Subarrays
• [Apr 26] 2444. Count Subarrays With Fixed Bounds
• [Apr 27] 3392. Count Subarrays of Length Three With a Condition
• [Apr 28] 2302. Count Subarrays With Score Less Than K
• [Apr 29] 2962. Count Subarrays Where Max Element Appears at Least K Times
• [Apr 30] 1295. Find Numbers with Even Number of Digits

May 2025

• [May 1] 2071. Maximum Number of Tasks You Can Assign
• [May 2] 838. Push Dominoes
• [May 3] 1007. Minimum Domino Rotations For Equal Row
• [May 4] 1128. Number of Equivalent Domino Pairs
• [May 5] 790. Domino and Tromino Tiling
• [May 6] 1920. Build Array from Permutation
• [May 7] 3341. Find Minimum Time to Reach Last Room I
• [May 8] 3342. Find Minimum Time to Reach Last Room II
• [May 9] 3343. Count Number of Balanced Permutations
• [May 10] 2918. Minimum Equal Sum of Two Arrays After Replacing Zeros
• [May 11] 1550. Three Consecutive Odds
• [May 12] 2094. Finding 3-Digit Even Numbers
• [May 13] 3335. Total Characters in String After Transformations I
• [May 14] 3337. Total Characters in String After Transformations II
• [May 15] 2900. Longest Unequal Adjacent Groups Subsequence I
• [May 16] 2901. Longest Unequal Adjacent Groups Subsequence II
• [May 17] 75. Sort Colors
• [May 18] 1931. Painting a Grid With Three Different Colors
• [May 19] 3024. Type of Triangle
• [May 20] 3355. Zero Array Transformation I
• [May 21] 73. Set Matrix Zeroes
• [May 22] 3362. Zero Array Transformation III
• [May 23] 3068. Find the Maximum Sum of Node Values
• [May 24] 2942. Find Words Containing Character
• [May 25] 2131. Longest Palindrome by Concatenating Two Letter Words
• [May 26] 1857. Largest Color Value in a Directed Graph
• [May 27] 2894. Divisible and Non-divisible Sums Difference
• [May 28] 3372. Maximize the Number of Target Nodes After Connecting Trees I
• [May 29] 3373. Maximize the Number of Target Nodes After Connecting Trees II
• [May 30] 2359. Find Closest Node to Given Two Nodes
• [May 31] 909. Snakes and Ladders

June 2025

• [Jun 1] 2929. Distribute Candies Among Children II
• [Jun 2] 135. Candy
• [Jun 3] 1298. Maximum Candies You Can Get from Boxes
• [Jun 4] 3403. Find the Lexicographically Largest String From the Box I
• [Jun 5] 1061. Lexicographically Smallest Equivalent String
• [Jun 6] 2434. Using a Robot to Print the Lexicographically Smallest String
• [Jun 7] 3170. Lexicographically Minimum String After Removing Stars
• [Jun 8] 386. Lexicographical Numbers
• [Jun 9] 440. K-th Smallest in Lexicographical Order
• [Jun 10] 3442. Maximum Difference Between Even and Odd Frequency I
• [Jun 11] 3445. Maximum Difference Between Even and Odd Frequency II
• [Jun 12] 3423. Maximum Difference Between Adjacent Elements in a Circular Array
• [Jun 13] 2616. Minimize the Maximum Difference of Pairs
• [Jun 14] 2566. Maximum Difference by Remapping a Digit
• [Jun 15] 1432. Max Difference You Can Get From Changing an Integer
• [Jun 16] 2016. Maximum Difference Between Increasing Elements
• [Jun 17] 3405. Count the Number of Arrays with K Matching Adjacent Elements
• [Jun 18] 2966. Divide Array Into Arrays With Max Difference
• [Jun 19] 2294. Partition Array Such That Maximum Difference Is K
• [Jun 20] 3443. Maximum Manhattan Distance After K Changes
• [Jun 21] 3085. Minimum Deletions to Make String K-Special
• [Jun 22] 2138. Divide a String Into Groups of Size k
• [Jun 23] 2081. Sum of k-Mirror Numbers
• [Jun 24] 2200. Find All K-Distant Indices in an Array
• [Jun 25] 2040. Kth Smallest Product of Two Sorted Arrays
• [Jun 26] 2311. Longest Binary Subsequence Less Than or Equal to K
• [Jun 27] 2014. Longest Subsequence Repeated k Times
• [Jun 28] 2099. Find Subsequence of Length K With the Largest Sum
• [Jun 29] 1498. Number of Subsequences That Satisfy the Given Sum Condition
• [Jun 30] 594. Longest Harmonious Subsequence

July 2025

• [Jul 1] 3330. Find the Original Typed String I
• [Jul 2] 3333. Find the Original Typed String II
• [Jul 3] 3304. Find the K-th Character in String Game I
• [Jul 4] 3307. Find the K-th Character in String Game II
• [Jul 5] 1394. Find Lucky Integer in an Array
• [Jul 6] 1865. Finding Pairs With a Certain Sum
• [Jul 7] 1353. Maximum Number of Events That Can Be Attended
• [Jul 8] 1751. Maximum Number of Events That Can Be Attended II
• [Jul 9] 3439. Reschedule Meetings for Maximum Free Time I
• [Jul 10] 3440. Reschedule Meetings for Maximum Free Time II
• [Jul 11] 2402. Meeting Rooms III
• [Jul 12] 1900. The Earliest and Latest Rounds Where Players Compete
• [Jul 13] 2410. Maximum Matching of Players With Trainers
• [Jul 14] 1290. Convert Binary Number in a Linked List to Integer
• [Jul 15] 3136. Valid Word
• [Jul 16] 3201. Find the Maximum Length of Valid Subsequence I
• [Jul 17] 3202. Find the Maximum Length of Valid Subsequence II
• [Jul 18] 2163. Minimum Difference in Sums After Removal of Elements
• [Jul 19] 1233. Remove Sub-Folders from the Filesystem
• [Jul 20] 1948. Delete Duplicate Folders in System
• [Jul 21] 1957. Delete Characters to Make Fancy String
• [Jul 22] 1695. Maximum Erasure Value
• [Jul 23] 1717. Maximum Score From Removing Substrings
• [Jul 24] 2322. Minimum Score After Removals on a Tree
• [Jul 25] 3487. Maximum Unique Subarray Sum After Deletion
• [Jul 26] 3480. Maximize Subarrays After Removing One Conflicting Pair
• [Jul 27] 2210. Count Hills and Valleys in an Array
• [Jul 28] 2044. Count Number of Maximum Bitwise-OR Subsets
• [Jul 29] 2411. Smallest Subarrays With Maximum Bitwise OR
• [Jul 30] 2419. Longest Subarray With Maximum Bitwise AND
• [Jul 31] 898. Bitwise ORs of Subarrays

Augest 2025

• [Aug 1] 118. Pascal's Triangle
• [Aug 2] 2561. Rearranging Fruits
• [Aug 3] 2106. Maximum Fruits Harvested After at Most K Steps
• [Aug 4] 904. Fruit Into Baskets
• [Aug 5] 3477. Fruits Into Baskets II
• [Aug 6] 3479. Fruits Into Baskets III
• [Aug 7] 3363. Find the Maximum Number of Fruits Collected
• [Aug 8] 808. Soup Servings
• [Aug 9] 231. Power of Two
• [Aug 10] 869. Reordered Power of 2
• [Aug 11] 2438. Range Product Queries of Powers
• [Aug 12] 2787. Ways to Express an Integer as Sum of Powers
• [Aug 13] 326. Power of Three
• [Aug 14] 2264. Largest 3-Same-Digit Number in String
• [Aug 15] 342. Power of Four
• [Aug 16] 1323. Maximum 69 Number
• [Aug 17] 837. New 21 Game
• [Aug 18] 679. 24 Game
• [Aug 19] 2348. Number of Zero-Filled Subarrays
• [Aug 20] 1277. Count Square Submatrices with All Ones
• [Aug 21] 1504. Count Submatrices With All Ones
• [Aug 22] 3195. Find the Minimum Area to Cover All Ones I
• [Aug 23] 3197. Find the Minimum Area to Cover All Ones II
• [Aug 24] 1493. Longest Subarray of 1's After Deleting One Element
• [Aug 25] 498. Diagonal Traverse
• [Aug 26] 3000. Maximum Area of Longest Diagonal Rectangle
• [Aug 27] 3459. Length of Longest V-Shaped Diagonal Segment
• [Aug 28] 3446. Sort Matrix by Diagonals
• [Aug 29] 3021. Alice and Bob Playing Flower Game
• [Aug 30] 36. Valid Sudoku
• [Aug 31] 37. Sudoku Solver

September 2025

• [Sep 1] 1792. Maximum Average Pass Ratio
• [Sep 2] 3025. Find the Number of Ways to Place People I
• [Sep 3] 3027. Find the Number of Ways to Place People II
• [Sep 4] 3516. Find Closest Person
• [Sep 5] 2749. Minimum Operations to Make the Integer Zero
• [Sep 6] 3495. Minimum Operations to Make Array Elements Zero
• [Sep 7] 1304. Find N Unique Integers Sum up to Zero
• [Sep 8] 1317. Convert Integer to the Sum of Two No-Zero Integers
• [Sep 9] 2327. Number of People Aware of a Secret
• [Sep 10] 1733. Minimum Number of People to Teach
• [Sep 11] 2785. Sort Vowels in a String
• [Sep 12] 3227. Vowels Game in a String
• [Sep 13] 3541. Find Most Frequent Vowel and Consonant
• [Sep 14] 966. Vowel Spellchecker
• [Sep 15] 1935. Maximum Number of Words You Can Type
• [Sep 16] 2197. Replace Non-Coprime Numbers in Array
• [Sep 17] 2353. Design a Food Rating System
• [Sep 18] 3408. Design Task Manager
• [Sep 19] 3484. Design Spreadsheet
• [Sep 20] 3508. Implement Router
• [Sep 21] 1912. Design Movie Rental System
• [Sep 22] 3005. Count Elements With Maximum Frequency
• [Sep 23] 165. Compare Version Numbers
• [Sep 24] 166. Fraction to Recurring Decimal
• [Sep 25] 120. Triangle
• [Sep 26] 611. Valid Triangle Number
• [Sep 27] 812. Largest Triangle Area
• [Sep 28] 976. Largest Perimeter Triangle
• [Sep 29] 1039. Minimum Score Triangulation of Polygon
• [Sep 30] 2221. Find Triangular Sum of an Array

October 2025

• [Oct 1] 1518. Water Bottles
• [Oct 2] 3100. Water Bottles II
• [Oct 3] 407. Trapping Rain Water II
• [Oct 4] 11. Container With Most Water

Structure

Each solution includes:

• Problem description
• Approach explanation
• Time and Space complexity
• Solution code

Language Used

• Primary: C++
• Alternative solutions in other languages are welcome

Resources

• LeetCode Profile

License

This repository is licensed under the MIT License - see the LICENSE file for details.