🌊 LeetCode Java Streams

A curated collection of LeetCode algorithm and data structure solutions built with Java Streams and functional programming patterns.

Designed to explore clean code, immutability, and fluent APIs for technical interview prep and advanced Java problem-solving.

I have solved these LeetCode problems using Java Streams.

LeetCode #	Question Header	Difficulty	Stream Used
4	Median of Two Sorted Arrays	Medium	sort, special
9	Palindrome Number	Easy	special
14	Longest Common Prefix	Medium	min, max, mapTo, special
26	Remove Duplicates from Sorted Array	Medium	special
27	Remove Element	Easy	special
49	Group Anagrams	Medium	special
136	Single Number	Easy	reduce, special
137	Single Number II	Easy	special
169	Majority Element	Easy	max, special
190	Reverse Bits	Easy	special
191	Number of 1 Bits	Easy	special
231	Power of Two	Easy	special
260	Single Number III	Easy	mapTo, special
283	Move Zeroes	Easy	sort, mapTo, special
326	Power of Three	Easy	special
342	Power of Four	Easy	special
347	Top K Frequent Elements	Medium	sort, mapTo, special
349	Intersection of Two Arrays	Easy	special
350	Intersection of Two Arrays II	Easy	special
387	First Unique Character in a String	Medium	mapTo, special
389	Find the Difference	Medium	reduce
412	Fizz Buzz	Easy	mapTo, special
434	Number of Segments in a String	Medium	special
451	Sort Characters By Frequency	Medium	sort, mapTo, special
459	Repeated Substring Pattern	Medium	special
500	Keyboard Row	Easy	special
520	Detect Capital	Easy	special
541	Reverse String II	Medium	min, mapTo, special
557	Reverse Words in a String III	Medium	special
677	Map Sum Pairs	Medium	reduce
692	Top K Frequent Words	Medium	sort, special
709	To Lower Case	Easy	mapTo, special
744	Find Smallest Letter Greater Than Target	Medium	min, special
747	Largest Number At Least Twice of Others	Medium	max, special
748	Shortest Completing Word	Easy	min, special
771	Jewels and Stones	Easy	special
791	Custom Sort String	Medium	sort, special
804	Unique Morse Code Words	Easy	mapTo, special
824	Goat Latin	Easy	mapTo, special
896	Monotonic Array	Easy	mapTo, special
905	Sort Array By Parity	Medium	sort, mapTo, special
1002	Find Common Characters	Medium	min, reduce, special
1122	Relative Sort Array	Medium	sort, mapTo, special
1128	Number of Equivalent Domino Pairs	Medium	min, reduce, mapTo, special
1207	Unique Number of Occurrences	Easy	max, special
1295	Find Numbers with Even Number of Digits	Medium	special
1309	Decrypt String from Alphabet to Integer Mapping	Medium	special
1331	Rank Transform of an Array	Easy	sort, mapTo, special
1337	The K Weakest Rows in a Matrix	Medium	sort, mapTo, special
1346	Check If N and Its Double Exist	Easy	special
1351	Count Negative Numbers in a Sorted Matrix	Medium	mapTo, special
1356	Sort Integers by The Number of 1 Bits	Medium	sort, mapTo, special
1403	Minimum Subsequence in Non-Increasing Order	Easy	special
1422	Maximum Score After Splitting a String	Medium	max, mapTo, special
1431	Kids With the Greatest Number of Candies	Easy	max, mapTo, special
1450	Number of Students Doing Homework at a Given Time	Easy	special
1455	Check If a Word Occurs As a Prefix of Any Word in a Sentence	Medium	special
1460	Make Two Arrays Equal by Reversing Subarrays	Easy	special
1480	Running Sum of 1d Array	Medium	special
1486	XOR Operation in an Array	Easy	reduce, mapTo, special
1491	Average Salary Excluding the Minimum and Maximum Salary	Medium	min, max, special
1512	Number of Good Pairs	Medium	mapTo, special
1550	Three Consecutive Odds	Easy	special
1598	Crawler Log Folder	Easy	max, reduce, mapTo, special
1624	Largest Substring Between Two Equal Characters	Medium	max
1636	Sort Array by Increasing Frequency	Medium	sort, mapTo, special
1748	Sum of Unique Elements	Medium	reduce, special
1780	Check if Number is a Sum of Powers of Three	Medium	special
1859	Sorting the Sentence	Medium	sort, special
1897	Redistribute Characters to Make All Strings Equal	Medium	mapTo, special
1903	Largest Odd Number in String	Medium	mapTo, special
1929	Concatenation of Array	Easy	mapTo, special
1935	Maximum Number of Words You Can Type	Medium	special
1941	Check if All Characters Have Equal Number of Occurrences	Easy	special
2006	Count Number of Pairs With Absolute Difference K	Medium	special
2042	Check if Numbers Are Ascending in a Sentence	Medium	special
2089	Find Target Indices After Sorting Array	Medium	special
2099	Find Subsequence of Length K With the Largest Sum	Medium	sort, mapTo, special
2124	Check if All A's Appears Before All B's	Medium	special
2129	Capitalize the Title	Medium	special
2138	Divide a String Into Groups of Size k	Medium	mapTo, special
2161	Partition Array According to Given Pivot	Medium	sort, mapTo, special
2176	Count Equal and Divisible Pairs in an Array	Medium	mapTo, special
2185	Counting Words With a Given Prefix	Medium	special
2191	Sort the Jumbled Numbers	Medium	sort, mapTo, special
2215	Find the Difference of Two Arrays	Medium	special
2248	Intersection of Multiple Arrays	Medium	sort, special
2255	Count Prefixes of a Given String	Medium	special
2284	Sender With Largest Word Count	Medium	max, special
2351	First Letter to Appear Twice	Medium	sort, min, special
2363	Merge Similar Items	Medium	special
2395	Find Subarrays With Equal Sum	Medium	special
2404	Most Frequent Even Element	Medium	max, special
2418	Sort the People	Medium	sort, special
2455	Average Value of Even Numbers That Are Divisible by Three	Medium	special
2529	Maximum Count of Positive Integer and Negative Integer	Medium	max, special
2540	Minimum Common Value	Medium	min, special
2545	Sort the Students by Their Kth Score	Medium	sort, special
2595	Number of Even and Odd Bits	Medium	special
2644	Find the Maximum Divisibility Score	Medium	max, reduce, special
2710	Remove Trailing Zeros From a String	Medium	mapTo, special
2788	Split Strings by Separator	Medium	special
2810	Faulty Keyboard	Medium	mapTo
2864	Maximum Odd Binary Number	Medium	sort, mapTo, special
2942	Find Words Containing Character	Medium	special
2956	Find Common Elements Between Two Arrays	Medium	special
3005	Count Elements With Maximum Frequency	Medium	max, mapTo, special
3083	Substring Present in a String	Medium	mapTo, special
3158	3158. Find the XOR of Numbers Which Appear Twice	Medium	reduce, mapTo, special
3280	Convert Date to Binary	Medium	special
3536	Maximum Product of Two Digits	Medium	sort, reduce
3541	Find Most Frequent Vowel and Consonant	Medium	max, reduce, special
3692	Majority Frequency Characters	Medium	max, special
3712	Sum Divisible by K	Medium	reduce, mapTo, special
3769	Sort Integers by Binary Reflection	Medium	sort, mapTo, special
3843	First Element with Unique Frequency	Medium	min, special
3852	Smallest Pair With Different Frequencies	Medium	sort, mapTo, special
3931	Check Adjacent Digit Differences	Medium	special
3940	Limit Occurrences in Sorted Array	Medium	special
3945	Digit Frequency Score	Medium	mapTo, special
3950	Exactly One Consecutive Set Bits Pair	Medium	special
3982	Sum of Integers with Maximum Digit Range	Medium	min, max, reduce, special
3992	Rearrange String to Avoid Character Pair	Medium	sort, mapTo, special