JAVA & SQL Solutions for Leetcode

This repository contains solutions, tests and descriptions to LeetCode problems, implemented in Java and MySQL

What is LeetCode?

LeetCode is an online platform where you can practice coding and prepare for technical interviews. It features a vast collection of algorithm and data structure problems, ranging from easy to hard, that you can solve using your preferred programming language.

How to Use This Repository?

The solutions to LeetCode problems are organized by problem number, level and type: java or sql. Each directory contains a README file with a brief description of the problem and a solution file with the corresponding code. In directory test you can find tests for problem`s solutions.

Java Solutions

#	Title	Solution	Test
404	Sum of Left Leaves	Java	Test
459	Repeated Substring Pattern	Java	Test
922	Sort Array By Parity II	Java	Test
1089	Duplicate Zeros	Java	Test
1431	Kids With the Greatest Number of Candies	Java	Test
1436	Destination City	Java	Test
1636	Sort Array by Increasing Frequency	Java	Test
1725	Number Of Rectangles That Can Form The Largest Square	Java	Test
1945	Sum of Digits of String After Convert	Java	Test
2042	Check if Numbers Are Ascending in a Sentence	Java	Test
2351	First Letter to Appear Twice	Java	Test
58	Length of Last Word	Java	Test
203	Remove Linked List Elements	Java	Test
415	Add Strings	Java	Test
748	Shortest Completing Word	Java	Test
1385	Find the Distance Value Between Two Arrays	Java	Test
1796	Second Largest Digit in a String	Java	Test
1909	Remove One Element to Make the Array Strictly Increasing	Java	Test
2309	Greatest English Letter in Upper and Lower Case	Java	Test
2432	The Employee That Worked on the Longest Task	Java	Test
326	Power of Three	Java	Test
766	Toeplitz Matrix	Java	Test
2405	Optimal Partition of String	Java	Test
2605	Form Smallest Number From Two Digit Arrays	Java	Test
179	Largest Number	Java	Test
1768	Merge Strings Alternately	Java	Test
470	Shuffle the Array	Java	Test
2099	Find Subsequence of Length K With the Largest Sum	Java	Test
2341	Maximum Number of Pairs in Array	Java	Test
2287	Rearrange Characters to Make Target String	Java	Test
1502	Can Make Arithmetic Progression From Sequence	Java	Test
1502	Is Subsequence	Java	Test
2150	Find All Lonely Numbers in the Array	Java	Test
2409	Count Days Spent Together	Java	Test
2315	Count Asterisks	Java	Test
2037	Minimum Number of Moves to Seat Everyone	Java	Test
1078	Occurrences After Bigram	Java	Test
1668	Maximum Repeating Substring	Java	Test
2652	Sum Multiples	Java	Test
884	Uncommon Words from Two Sentences	Java	Test
1399	Count Largest Group	Java	Test
2515	Shortest Distance to Target String in a Circular Array	Java	Test
2057	Smallest Index With Equal Value	Java	Test
1886	Determine Whether Matrix Can Be Obtained By Rotation	Java	Test
1185	Day of the Week	Java	Test
993	Cousins in Binary Tree	Java	Test
1566	Detect Pattern of Length M Repeated K or More Times	Java	Test
13	Roman to Integer	Java	Test
2278	Percentage of Letter in String	Java	Test
338	Counting Bits	Java	Test
1221	Split a String in Balanced Strings	Java	Test
1287	Element Appearing More Than 25% In Sorted Array	Java	Test
144	Binary Tree Preorder Traversal	Java	Test
2566	Maximum Difference by Remapping a Digit	Java	Test
1984	Minimum Difference Between Highest and Lowest of K Scores	Java	Test
2224	Minimum Number of Operations to Convert Time	Java	Test
1854	Maximum Population Year	Java	Test
231	Power of Two	Java	Test
401	Binary Watch	Java	Test
623	Add One Row to Tree	Java	Test
2027	Minimum Moves to Convert String	Java	Test
2079	Watering Plants	Java	Test
763	Partition Labels	Java	Test
169	Majority Element	Java	Test
234	Palindrome Linked List	Java	Test
2606	Find the Substring With Maximum Cost	Java	Test
2154	Keep Multiplying Found Values by Two	Java	Test
2389	Longest Subsequence With Limited Sum	Java	Test
1232	Check If It Is a Straight Line	Java	Test
2418	Sort the People	Java	Test
219	Contains Duplicate II	Java	Test
2748	Number of Beautiful Pairs	Java	Test
2192	All Ancestors of a Node in a Directed Acyclic Graph	Java	Test
1882	Process Tasks Using Servers	Java	Test
897	Increasing Order Search Tree	Java	Test
1895	Sorting the Sentence	Java	Test
387	First Unique Character in a String	Java	Test
412	Fizz Buzz	Java	Test
977	Squares of a Sorted Array	Java	Test
2144	Minimum Cost of Buying Candies With Discount	Java	Test
2744	Find Maximum Number of String Pairs	Java	Test
35	Search Insert Position	Java	Test
1403	Minimum Subsequence in Non-Increasing Order	Java	Test
111	Minimum Depth of Binary Tree	Java	Test
1971	Find if Path Exists in Graph	Java	Test
863	All Nodes Distance K in Binary Tree	Java	Test
1189	Maximum Number of Balloons	Java	Test
594	Longest Harmonious Subsequence	Java	Test
2194	Cells in a Range on an Excel Sheet	Java	Test
802	Find Eventual Safe States	Java	Test
965	Univalued Binary Tree	Java	Test
1491	Average Salary Excluding the Minimum and Maximum Salary	Java	Test
2670	Find the Distinct Difference Array	Java	Test
872	Leaf-Similar Trees	Java	Test
697	Degree of an Array	Java	Test
1893	Check if All the Integers in a Range Are Covered	Java	Test
2160	Minimum Sum of Four Digit Number After Splitting Digits	Java	Test
136	Single Number	Java	Test
207	Course Schedule	Java	Test
836	Rectangle Overlap	Java	Test
1218	Longest Arithmetic Subsequence of Given Difference	Java	Test
1560	Most Visited Sector in a Circular Track	Java	Test
507	Perfect Number	Java	Test
735	Asteroid Collision	Java	Test
953	Verifying an Alien Dictionary	Java	Test
1672	Richest Customer Wealth	Java	Test
867	Transpose Matrix	Java	Test
2769	Find the Maximum Achievable Number	Java	Test
674	Longest Continuous Increasing Subsequence	Java	Test
1422	Maximum Score After Splitting a String	Java	Test
2798	Number of Employees Who Met the Target	Java	Test
598	Range Addition II	Java	Test
495	Teemo Attacking	Java	Test
605	Can Place Flowers	Java	Test
2660	Determine the Winner of a Bowling Game	Java	Test
783	Minimum Distance Between BST Nodes	Java	Test
1812	Determine Color of a Chessboard Square	Java	Test
1619	Mean of Array After Removing Some Elements	Java	Test
671	Second Minimum Node In a Binary Tree	Java	Test
2586	Count the Number of Vowel Strings in Range	Java	Test
1346	Check If N and Its Double Exist	Java	Test
1805	Number of Different Integers in a String	Java	Test
2220	Minimum Bit Flips to Convert Number	Java	Test
9	Palindrome Number	Java	Test
530	Minimum Absolute Difference in BST	Java	Test
1662	Check If Two String Arrays are Equivalent	Java	Test
2928	Distribute Candies Among Children I	Java	Test
1816	Truncate Sentence	Java	Test
463	Island Perimeter	Java	Test
461	Hamming Distance	Java	Test
1859	Sorting the Sentence	Java	Test
2399	Check Distances Between Same Letters	Java	Test
1309	Decrypt String from Alphabet to Integer Mapping	Java	Test
777	Swap Adjacent in LR String	Java	Test
2937	Make Three Strings Equal	Java	Test
2259	Remove Digit From Number to Maximize Result	Java	Test
70	Climbing Stairs	Java	Test
1455	Check If a Word Occurs As a Prefix of Any Word in a Sentence	Java	Test
2558	Take Gifts From the Richest Pile	Java	Test
1281	Subtract the Product and Sum of Digits of an Integer	Java	Test
21	Merge Two Sorted Lists	Java	Test
1304	Find N Unique Integers Sum up to Zero	Java	Test
925	Long Pressed Name	Java	Test
1822	Sign of the Product of an Array	Java	Test
2022	Convert 1D Array Into 2D Array	Java	Test
118	Pascal's Triangle	Java	Test
69	Sqrt(x)	Java	Test
2032	Two Out of Three	Java	Test
509	Fibonacci Number	Java	Test
2185	Counting Words With a Given Prefix	Java	Test
2441	Largest Positive Integer That Exists With Its Negative	Java	Test
2600	K Items With the Maximum Sum	Java	Test
1002	Find Common Characters	Java	Test
1773	Count Items Matching a Rule	Java	Test
2006	Count Number of Pairs With Absolute Difference K	Java	Test
1791	Find Center of Star Graph	Java	Test
1629	Slowest Key	Java	Test
226	Invert Binary Tree	Java	Test
389	Find the Difference	Java	Test
1637	Widest Vertical Area Between Two Points Containing No Points	Java	Test
1342	Number of Steps to Reduce a Number to Zero	Java	Test
171	Excel Sheet Column Number	Java	Test
3079	Find the Sum of Encrypted Integers	Java	Test
1356	Sort Integers by The Number of 1 Bits	Java	Test
1652	Defuse the Bomb	Java	Test
2788	Split Strings by Separator	Java	Test
504	Base 7	Java	Test
2824	Count Pairs Whose Sum is Less than Target	Java	Test
2347	Best Poker Hand	Java	Test
1748	Sum of Unique Elements	Java	Test
1624	Largest Substring Between Two Equal Characters	Java	Test
1995	Count Special Quadruplets	Java	Test
383	Ransom Note	Java	Test
2525	Categorize Box According to Criteria	Java	Test
3099	Harshad Number	Java	Test

SQL Solutions

#	Title	Solution
1211	Queries Quality and Percentage	SQL
1280	Students and Examinations	SQL
1327	List the Products Ordered in a Period	SQL
1873	Customers Who Never Order	SQL
627	Swap Salary	SQL
1978	Employees Whose Manager Left the Company	SQL
596	Classes More Than 5 Students	SQL
610	Triangle Judgement	SQL
196	Delete Duplicate Emails	SQL
1517	Find Users With Valid E-Mails	SQL
182	Duplicate Emails	SQL
620	Not Boring Movies	SQL
586	Customer Placing the Largest Number of Orders	SQL