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.idea
.idea
 
 
JavaSyntaxPractice
JavaSyntaxPractice
 
 
LeetCodeNotes
LeetCodeNotes
 
 
1.two-sum.java
1.two-sum.java
 
 
100.same-tree.java
100.same-tree.java
 
 
101.symmetric-tree.java
101.symmetric-tree.java
 
 
102.binary-tree-level-order-traversal.java
102.binary-tree-level-order-traversal.java
 
 
103.binary-tree-zigzag-level-order-traversal.java
103.binary-tree-zigzag-level-order-traversal.java
 
 
104.maximum-depth-of-binary-tree.java
104.maximum-depth-of-binary-tree.java
 
 
1047.Remove All Adjacent Duplicates In String.java
1047.Remove All Adjacent Duplicates In String.java
 
 
105.construct-binary-tree-from-preorder-and-inorder-traversal.java
105.construct-binary-tree-from-preorder-and-inorder-traversal.java
 
 
106.construct-binary-tree-from-inorder-and-postorder-traversal.java
106.construct-binary-tree-from-inorder-and-postorder-traversal.java
 
 
107.binary-tree-level-order-traversal-ii.java
107.binary-tree-level-order-traversal-ii.java
 
 
108.convert-sorted-array-to-binary-search-tree.java
108.convert-sorted-array-to-binary-search-tree.java
 
 
11.container-with-most-water.java
11.container-with-most-water.java
 
 
110.balanced-binary-tree.java
110.balanced-binary-tree.java
 
 
111.minimum-depth-of-binary-tree.java
111.minimum-depth-of-binary-tree.java
 
 
112.path-sum.java
112.path-sum.java
 
 
113.path-sum-ii.java
113.path-sum-ii.java
 
 
114.flatten-binary-tree-to-linked-list.java
114.flatten-binary-tree-to-linked-list.java
 
 
116.populating-next-right-pointers-in-each-node.java
116.populating-next-right-pointers-in-each-node.java
 
 
117.populating-next-right-pointers-in-each-node-ii.java
117.populating-next-right-pointers-in-each-node-ii.java
 
 
1175.prime-arrangements.java
1175.prime-arrangements.java
 
 
12.integer-to-roman.java
12.integer-to-roman.java
 
 
121.best-time-to-buy-and-sell-stock.java
121.best-time-to-buy-and-sell-stock.java
 
 
122.best-time-to-buy-and-sell-stock-ii.java
122.best-time-to-buy-and-sell-stock-ii.java
 
 
1229.meeting-scheduler.java
1229.meeting-scheduler.java
 
 
1249.Minimum Remove to Make Valid Parentheses.java
1249.Minimum Remove to Make Valid Parentheses.java
 
 
125.valid-palindrome.java
125.valid-palindrome.java
 
 
128.longest-consecutive-sequence.java
128.longest-consecutive-sequence.java
 
 
129.sum-root-to-leaf-numbers.java
129.sum-root-to-leaf-numbers.java
 
 
13.roman-to-integer.java
13.roman-to-integer.java
 
 
131.palindrome-partitioning.java
131.palindrome-partitioning.java
 
 
138.copy-list-with-random-pointer.java
138.copy-list-with-random-pointer.java
 
 
14.longest-common-prefix.java
14.longest-common-prefix.java
 
 
141.linked-list-cycle.java
141.linked-list-cycle.java
 
 
142.linked-list-cycle-ii.java
142.linked-list-cycle-ii.java
 
 
144.binary-tree-preorder-traversal.java
144.binary-tree-preorder-traversal.java
 
 
1445.apples-oranges.java
1445.apples-oranges.java
 
 
145.binary-tree-postorder-traversal.java
145.binary-tree-postorder-traversal.java
 
 
146.lru-cache.java
146.lru-cache.java
 
 
148.sort-list.java
148.sort-list.java
 
 
15.3-sum.java
15.3-sum.java
 
 
150.evaluate-reverse-polish-notation.java
150.evaluate-reverse-polish-notation.java
 
 
151.reverse-words-in-a-string.java
151.reverse-words-in-a-string.java
 
 
155.min-stack.java
155.min-stack.java
 
 
160.intersection-of-two-linked-lists.java
160.intersection-of-two-linked-lists.java
 
 
1652.defuse-the-bomb.java
1652.defuse-the-bomb.java
 
 
167.two-sum-ii-input-array-is-sorted.java
167.two-sum-ii-input-array-is-sorted.java
 
 
169.majority-element.java
169.majority-element.java
 
 
17.letter-combinations-of-a-phone-number.java
17.letter-combinations-of-a-phone-number.java
 
 
173.binary-search-tree-iterator.java
173.binary-search-tree-iterator.java
 
 
1768.merge-strings-alternately.java
1768.merge-strings-alternately.java
 
 
18.4-sum.java
18.4-sum.java
 
 
189.rotate-array.java
189.rotate-array.java
 
 
19.remove-nth-node-from-end-of-list.java
19.remove-nth-node-from-end-of-list.java
 
 
1929.concatenation-of-array.java
1929.concatenation-of-array.java
 
 
1957.delete-characters-to-make-fancy-string.java
1957.delete-characters-to-make-fancy-string.java
 
 
199.binary-tree-right-side-view.java
199.binary-tree-right-side-view.java
 
 
20.valid-parentheses.java
20.valid-parentheses.java
 
 
202.happy-number.java
202.happy-number.java
 
 
203.Remove-linked-list-elements.java
203.Remove-linked-list-elements.java
 
 
205.isomorphic-strings.java
205.isomorphic-strings.java
 
 
206.reverse-linked-list.java
206.reverse-linked-list.java
 
 
209.minimum-size-subarray-sum.java
209.minimum-size-subarray-sum.java
 
 
21.merge-two-sorted-lists.java
21.merge-two-sorted-lists.java
 
 
216.combination-sum-iii.java
216.combination-sum-iii.java
 
 
217.contains-duplicate.java
217.contains-duplicate.java
 
 
219.contains-duplicate-ii.java
219.contains-duplicate-ii.java
 
 
22.generate-parentheses.java
22.generate-parentheses.java
 
 
222.count-complete-tree-nodes.java
222.count-complete-tree-nodes.java
 
 
225.implement-stack-using-queues.java
225.implement-stack-using-queues.java
 
 
226.invert-binary-tree.java
226.invert-binary-tree.java
 
 
2266.count-number-of-texts.java
2266.count-number-of-texts.java
 
 
228.summary-ranges.java
228.summary-ranges.java
 
 
229.majority-element-ii.java
229.majority-element-ii.java
 
 
23.merge-k-sorted-lists.java
23.merge-k-sorted-lists.java
 
 
230.kth-smallest-element-in-a-bst.java
230.kth-smallest-element-in-a-bst.java
 
 
232.implement-queue-using-stacks.java
232.implement-queue-using-stacks.java
 
 
235.lowest-common-ancestor-of-a-binary-search-tree.java
235.lowest-common-ancestor-of-a-binary-search-tree.java
 
 
2351.first-letter-to-appear-twice.java
2351.first-letter-to-appear-twice.java
 
 
236.lowest-common-ancestor-of-a-binary-tree.java
236.lowest-common-ancestor-of-a-binary-tree.java
 
 
238.product-of-array-except-self.java
238.product-of-array-except-self.java
 
 
24.swap-nodes-in-pairs.java
24.swap-nodes-in-pairs.java
 
 
242.valid-anagram.java
242.valid-anagram.java
 
 
2486.append-characters-to-string-to-make-subsequence.java
2486.append-characters-to-string-to-make-subsequence.java
 
 
2490.circular-sentence.java
2490.circular-sentence.java
 
 
2515.shortest-distance-to-target-string-in-a-circular-array.java
2515.shortest-distance-to-target-string-in-a-circular-array.java
 
 
257.binary-tree-paths.java
257.binary-tree-paths.java
 
 
26.remove-duplicates-from-sorted-array.java
26.remove-duplicates-from-sorted-array.java
 
 
2645.minimum-additions-to-make-valid-string.java
2645.minimum-additions-to-make-valid-string.java
 
 
27.remove-element.java
27.remove-element.java
 
 
274.h-index.java
274.h-index.java
 
 
278.first-bad-version.java
278.first-bad-version.java
 
 
28.find-the-index-of-the-first-occurrence-in-a-string.java
28.find-the-index-of-the-first-occurrence-in-a-string.java
 
 
283.move-zeroes.java
283.move-zeroes.java
 
 
290.word-pattern.java
290.word-pattern.java
 
 
3.longest-substring-without-repeating-characters.java
3.longest-substring-without-repeating-characters.java
 
 
3014.minimum-number-of-pushes-to-type-word-i.java
3014.minimum-number-of-pushes-to-type-word-i.java
 
 
304.range-sum-query-2-d-immutable.java
304.range-sum-query-2-d-immutable.java
 
 

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🧠Leetcode with Java☕

This repository is a collection of Java solutions to popular Leetcode problems, sourced from:

🔍 Focused Topics

  • Arrays & Strings
  • HashMaps & Sets
  • Trees
  • Backtracking (Recursion + Pruning)

💡 LeetCompare (Live Comparison Tool)

I'm also building a lightweight tool to compare up to four similar Leetcode problems side-by-side, making it easier to identify patterns and see how small changes in constraints can lead to different solutions.

The goal is to make learning more efficient through analogy, not memorization.

🔗 Try the trial version here (currently migrating the backend to AWS for better scalability and performance):
https://emily.brajk.me/leetcode/comparisons

📬 Want to collaborate or give feedback?
Contact me here

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