Java Solutions for Leetcode Questions

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Problems & Solutiuons

#	Problem	Category	Difficulty	Solution
2235	Add Two Integers	Math	Easy	Solution
1281	Subtract the Product and Sum of Digits of an Integer	Loops, Math	Easy	Solution
338	Counting Bits	Bit Manipulation	Easy	Solution
9	Palindrome Number	Math, Loops	Easy	Solution
1	Two-Sum	Array	Easy	Solution
561	Array Partition	Array	Easy	Solution
1295	Find Numbers with Even Number of Digits	Array	Easy	Solution
1672	Richest Customer Wealth	Array	Easy	Solution
1920	Build Array from Permutation	Array	Easy	Solution
1929	Concatenation of Array	Array	Easy	Solution
1480	Running Sum of 1d Array	Array	Easy	Solution
387	First Unique Character in a String	Array	Easy	Solution
1470	Shuffle the Array	Array	Easy	Solution
804	Unique Morse Code Words	Array	Easy	Solution
1512	Number of Good Pairs	Array	Easy	Solution
485	Max Consecutive Ones	Array	Easy	Solution
1365	How Many Numbers Are Smaller Than the Current Number	Array	Easy	Solution
1389	Create Target Array in the Given Order	Array	Easy	Solution
1832	Check if the Sentence Is Pangram	Array	Easy	Solution
1773	Count Items Matching a Rule	Array, String	Easy	Solution
1732	Find the Highest Altitude	Array, Prfix Sum	Easy	Solution
832	Flipping an Image	Array, Matrix	Easy	Solution
234	Palindrome Linked List	LinkedList, Two Pointer, Recursion, Stack	Easy	Solution
342	Power of Four	Math, Bit Manipulation, Recursion	Easy	Solution
383	Ransom Note	Hash Table, Counting, String	Easy	Solution
326	Power of Three	Math, Recursion	Easy	Solution
1252	Cells with Odd Values in a Matrix	Array, Math	Easy	Solution
1572	Matrix Diagonal Sum	Array, Matrix	Easy	Solution
867	Transpose Matrix	Array, Matrix, Simulation	Easy	Solution
989	Add to Array-Form of Integer	Array, Math	Easy	Solution
1854	Maximum Population Year	Array, Counting	Easy	Solution
1886	Determine Whether Matrix Can Be Obtained By Rotation	Array, Matrix	Easy	Solution
26	Remove Duplicate from Sorted Array	Array, Two Pointers	Easy	Solution
66	Plus One	Math, Array	Easy	Solution
724	Find Pivot Index	Array, Prefix Sum	Easy	Solution
463	Island Perimeter	Array, Matrix	Easy	Solution
136	Single Number	Array, Bit Manipulation	Easy	Solution
27	Remove Element	Array, Two Pointers	Easy	Solution
217	Contains Duplicate	Array, Hash Table, Sorting	Easy	Solution
219	Contains Duplicate II	Array, Hash Table, Sliding Window	Easy	Solution
977	Squares of a Sorted Array	Array, Two Pointers, Sorting	Easy	Solution
121	Best Time to Buy and Sell Stock	Array (Without DP)	Easy	Solution
448	Find All Numbers Disappeared in an Array	Array, Hash Table	Easy	Solution
645	Set Mismatch	Array, Hash Table, Bit Manipulation, Sorting	Easy	Solution
704	Binary Search	Array, Binary Search	Easy	Solution
69	Sqrt(x)	Math, Binary Search	Easy	Solution
374	Guess Number Higher or Lower	Binary Search	Easy	Solution
278	First Bad Version	Binary Search	Easy	Solution
744	Find Smallest Letter Greater Than Target	Array, Binary Search	Easy	Solution
1351	Count Negative Numbers in a Sorted Matrix	Array, Binary Search, Matrix	Easy	Solution
349	Intersection of Two Array	Array, Binary Search,Two Pointers, Hash Table, Sorting	Easy	Solution
350	Intersection of Two Arrays II	Array, Hash Table, Two Pointers, Binary Search, Sorting	Easy	Solution
268	Missing Number	Array, Binary Search, Math, Hash Table, Sorting, Bit Manipulation	Easy	Solution
441	Arranging Coins	Array, Binary Search	Easy	Solution
35	Search Insert Position	Array, Binary Search	Easy	Solution
169	Majority Element	Array, Moore Voting Algorithm	Easy	Solution
1108	Defanging an IP Address	String	Easy	Solution
520	Detect Capital	Strings	Easy	Solution
344	Reverse String	Two Pointers, String	Easy	Solution
412	Fizz Buzz	String, Math, Simulation	Easy	Solution
859	Buddy Strings	Strings, Hash Table	Easy	Solution
13	Roman to Integer	String, Hash Table, Math	Easy	Solution
1768	Merge Strings Alternately	String, Two Pointers	Easy	Solution
1528	Shuffle String	Array, String	Easy	Solution
7	Reverse Integer	Math, Loops	Medium	Solution
172	Factorial Trailing Zeroes	Math, Loops	Medium	Solution
50	Pow(x,n)	Math, Loops (Without Recursion)	Medium	Solution
869	Reordered Power of 2	Math, Sorting	Medium	Solution
1338	Reduce Array Size to The Half	Array	Medium	Solution
659	Split Array into Consecutive Subsequences	Array	Medium	Solution
1329	Sort the Matrix Diagonally	Array, Sorting, Matrix	Medium	Solution
48	Rotate Image	Array, Math, Matrix	Medium	Solution
55	Jump Game	Array, DP, Greedy	Medium	Solution
75	Sort Colors	Array, Two Pointers, Sorting	Medium	Solution
137	Single Number II	Array, Bit Manipulation	Medium	Solution
1493	Longest Subarray of 1's After Deleting One Element	Array (Without DP)	Medium	Solution
442	Find All Duplicate in an Array	Array, Hash Table	Medium	Solution
189	Rotate Array	Array, Math, Two Pointers	Medium	Solution
34	Find First and Last Position of Element in Sorted Array	Array, Binary Search	Medium	Solution
852	Peak Index in a Mountain Array	Array, Binary Search	Medium	Solution
162	Find Peak Element	Array, Binary Search	Medium	Solution
33	Search in Rotated Sorted Array	Array, Binary Search	Medium	Solution
81	Search in Rotated Sorted Array II	Array, Binary Search	Medium	Solution
153	Find Minimum in Rotated Sorted Array	Array, Binary Search	Medium	Solution
754	Reach a Number	Math, Binary Search	Medium	Solution
74	Search a 2D Matrix	Array, Binary Search, Matrix	Medium	Solution
436	Find Right Interval	Array, Binary Search, Sorting	Medium	Solution
209	Minimum Size Subarray Sum	Array, Binary Search, Prefix Sum, SW	Medium	Solution
2300	Successful Pairs of Spells and Potions	Array, Binary Search, Sorting, Two Pointers	Medium	Solution
287	Find the Duplicate Number	Array, Binary Search, Two Pointers, Bit Manipulation	Medium	Solution
707	Design Linked List	Linked List, Design	Medium	Solution
363	Max Sum of Rectangle No Larger Than K	Array, Binary Search, Matrix, Prefix Sum, Ordered Set	Hard	Solution
871	Minimum Number of Refueling Stops	Array, DP	Hard	Solution
41	First Missing Number	Array, Hash Table	Hard	Solution
1095	Find in Mountain Array	Array, Binary Search	Hard	Solution
410	Split Array Largest Sum	Array, Binary Search, Prefix Sum	Hard	Solution
4	Median of Two Sorted Arrays	Array, Binary Search	Hard	Solution
295	Find Median from Data Stream	Two Pointers, Sorting, Heap(PQ), Data Stream	Hard	Solution