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Code solutions

This repository is for all the codes i practice on different coding sites.

Codewars

Package: com.ankitech.codewars

Sl No. Challenge Points Solution
1. Duplicate Encoder 2 DuplicateEncoder.java, DuplicateEncoderTest.java
2. Get the Middle Character 2 MiddleCharacter.java, MiddleCharacterTest.java
3. Money, Money, Money 2 Money.java, MoneyTest.java
4. Disemvowel Trolls 2 Troll.java, TrollTest.java
5. Shortest Word 2 ShortestWord.java, ShortestWordTest.java
6. Decode the Morse code 2 MorseCodeDecoder.java, MorseCodeDecoderTest.java
7. Help the bookseller ! 2 StockList.java, StockListTest.java
8. Mexican Wave 2 MexicanWave.java, MexicanWaveTest.java
9. Valid Braces 2 BraceChecker.java, BraceCheckerTest.java

HackerRank

Package: com.ankitech.hackerrank

Sl No. Challenge Points Solution
1. Valid Username Regular Expression 20 UsernameValidator.java, UsernameValidatorTest.java
2. Java Regex 20 IPaddressValidation.java, IPaddressValidationTest.java
3. Left Rotation 20 LeftRotation.java, LeftRotationTest.java
4. Java Primality Test 20 PrimeCheck.java, PrimeCheckTest.java
5. Arrays - Reverse string 20 ReverseArray.java, ReverseArrayTest.java
6. Sock Merchant 10 SockMerchant.java, SockMerchantTest.java
7. Compare the Triplets 20 Triplet.java, TripletTest.java
8. Diagonal Difference 10 DiagonalDifference.java, DiagonalDifferenceTest.java
9. Plus Minus 10 PlusMinus.java, PlusMinusTest.java
10. Staircase 10 Staircase.java, StaircaseTest.java
11. Mini-Max Sum 10 MinMaxSum.java, MinMaxSumTest.java
12. Birthday Cake Candles 10 BirthdayCandles.java, BirthdayCandlesTest.java
13. Time Conversion 10 TimeCoversion.java, TimeCoversionTest.java
14. Grading Students 10 GradingStudent.java, GradingStudentTest.java
15. Flatland Space Stations 10 FlatlandSpaceStation.java, FlatlandSpaceStationTest.java
16. Apple and Orange 10 AppleAndOrange.java, AppleAndOrangeTest.java
17. Kangaroo 10 Kangaroo.java, KangarooTest.java
18. ElectronicShop 10 ElectronicShop.java, ElectronicShopTest.java
19. Cats and a Mouse 10 CatAndMouse.java, CatAndMouseTest.java
19. FizzBuzz 10 FizzBuzz.java, FizzBuzzTest.java

ROSALIND

Package: com.ankitech.rosalind

Sl No. Challenge Points Solution
1. Dummy challenge 0 Dummy.java, dummy1.java

CoderByte

Package: com.ankitech.coderbyte

Sl No. Challenge Points Solution
1. Dummy challenge 0 Dummy.java, dummy1.java

LeetCode

Package: com.ankitech.leetcode

Sl No. Category Challenge Dificulty Solution status
1 Array / String 88. Merge Sorted Array Easy MergeSortedArray.java,MergeSortedArrayTest.java Done
2 Array / String 27. Remove Element Easy RemoveElement.java,RemoveElementTest.java Done
3 Array / String 26. Remove Duplicates from Sorted Array Easy todo.java,todoTest.java Done
4 Array / String 80. Remove Duplicates from Sorted Array II Medium todo.java,todoTest.java Done
5 Array / String 169. Majority Element Easy todo.java,todoTest.java Done
6 Array / String 189. Rotate Array Medium todo.java,todoTest.java Done
7 Array / String 121. Best Time to Buy and Sell Stock Easy todo.java,todoTest.java Done
8 Array / String 122. Best Time to Buy and Sell Stock II Medium todo.java,todoTest.java Done
9 Array / String 55. Jump Game Medium todo.java,todoTest.java Pending
10 Array / String 45. Jump Game II Medium todo.java,todoTest.java Pending
11 Array / String 274. H-Index Medium todo.java,todoTest.java Pending
12 Array / String 380. Insert Delete GetRandom O(1) Medium todo.java,todoTest.java Pending
13 Array / String 238. Product of Array Except Self Medium todo.java,todoTest.java Pending
14 Array / String 134. Gas Station Medium todo.java,todoTest.java Pending
15 Array / String 135. Candy Hard todo.java,todoTest.java Pending
16 Array / String 42. Trapping Rain Water Hard todo.java,todoTest.java Pending
17 Array / String 13. Roman to Integer Easy todo.java,todoTest.java Pending
18 Array / String 12. Integer to Roman Medium todo.java,todoTest.java Pending
19 Array / String 58. Length of Last Word Easy todo.java,todoTest.java Pending
20 Array / String 14. Longest Common Prefix Easy todo.java,todoTest.java Pending
21 Array / String 151. Reverse Words in a String Medium todo.java,todoTest.java Pending
22 Array / String 6. Zigzag Conversion Medium todo.java,todoTest.java Pending
23 Array / String 28. Find the Index of the First Occurrence in a String Easy todo.java,todoTest.java Pending
24 Array / String 68. Text Justification Hard todo.java,todoTest.java Pending
25 Two Pointers 125. Valid Palindrome Easy todo.java,todoTest.java Done
26 Two Pointers 392. Is Subsequence Easy todo.java,todoTest.java Pending
27 Two Pointers 167. Two Sum II - Input Array Is Sorted Medium todo.java,todoTest.java Pending
28 Two Pointers 11. Container With Most Water Medium todo.java,todoTest.java Pending
29 Two Pointers 15. 3Sum Medium todo.java,todoTest.java Pending
30 Sliding Window 209. Minimum Size Subarray Sum Medium todo.java,todoTest.java Pending
31 Sliding Window 3. Longest Substring Without Repeating Characters Medium todo.java,todoTest.java Pending
32 Sliding Window 30. Substring with Concatenation of All Words Hard todo.java,todoTest.java Pending
33 Sliding Window 76. Minimum Window Substring Hard todo.java,todoTest.java Pending
34 Matrix 36. Valid Sudoku Medium todo.java,todoTest.java Pending
35 Matrix 54. Spiral Matrix Medium todo.java,todoTest.java Pending
36 Matrix 48. Rotate Image Medium todo.java,todoTest.java Pending
37 Matrix 73. Set Matrix Zeroes Medium todo.java,todoTest.java Pending
38 Matrix 289. Game of Life Medium todo.java,todoTest.java Pending
39 Hashmap 383. Ransom Note Easy todo.java,todoTest.java Pending
40 Hashmap 205. Isomorphic Strings Easy todo.java,todoTest.java Pending
41 Hashmap 290. Word Pattern Easy todo.java,todoTest.java Pending
42 Hashmap 242. Valid Anagram Easy todo.java,todoTest.java Pending
43 Hashmap 49. Group Anagrams Medium todo.java,todoTest.java Pending
44 Hashmap 1. Two Sum Easy todo.java,todoTest.java Pending
45 Hashmap 202. Happy Number Easy todo.java,todoTest.java Pending
46 Hashmap 219. Contains Duplicate II Easy todo.java,todoTest.java Pending
47 Hashmap 128. Longest Consecutive Sequence Medium todo.java,todoTest.java Pending
48 Intervals 228. Summary Ranges Easy todo.java,todoTest.java Pending
49 Intervals 56. Merge Intervals Medium todo.java,todoTest.java Pending
50 Intervals 57. Insert Interval Medium todo.java,todoTest.java Pending
51 Intervals 452. Minimum Number of Arrows to Burst Balloons Medium todo.java,todoTest.java Pending
52 Stack 20. Valid Parentheses Easy todo.java,todoTest.java Pending
53 Stack 71. Simplify Path Medium todo.java,todoTest.java Pending
54 Stack 155. Min Stack Medium todo.java,todoTest.java Pending
55 Stack 150. Evaluate Reverse Polish Notation Medium todo.java,todoTest.java Pending
56 Stack 224. Basic Calculator Hard todo.java,todoTest.java Pending
57 Linked List 141. Linked List Cycle Easy todo.java,todoTest.java Pending
58 Linked List 2. Add Two Numbers Medium todo.java,todoTest.java Pending
59 Linked List 21. Merge Two Sorted Lists Easy todo.java,todoTest.java Pending
60 Linked List 138. Copy List with Random Pointer Medium todo.java,todoTest.java Pending
61 Linked List 92. Reverse Linked List II Medium todo.java,todoTest.java Pending
62 Linked List 25. Reverse Nodes in k-Group Hard todo.java,todoTest.java Pending
63 Linked List 19. Remove Nth Node From End of List Medium todo.java,todoTest.java Pending
64 Linked List 82. Remove Duplicates from Sorted List II Medium todo.java,todoTest.java Pending
65 Linked List 61. Rotate List Medium todo.java,todoTest.java Pending
66 Linked List 86. Partition List Medium todo.java,todoTest.java Pending
67 Linked List 146. LRU Cache Medium todo.java,todoTest.java Pending
68 Binary Tree General 104. Maximum Depth of Binary Tree Easy todo.java,todoTest.java Pending
69 Binary Tree General 100. Same Tree Easy todo.java,todoTest.java Pending
70 Binary Tree General 226. Invert Binary Tree Easy todo.java,todoTest.java Pending
71 Binary Tree General 101. Symmetric Tree Easy todo.java,todoTest.java Pending
72 Binary Tree General 105. Construct Binary Tree from Preorder and Inorder Traversal Medium todo.java,todoTest.java Pending
73 Binary Tree General 106. Construct Binary Tree from Inorder and Postorder Traversal Medium todo.java,todoTest.java Pending
74 Binary Tree General 117. Populating Next Right Pointers in Each Node II Medium todo.java,todoTest.java Pending
75 Binary Tree General 114. Flatten Binary Tree to Linked List Medium todo.java,todoTest.java Pending
76 Binary Tree General 112. Path Sum Easy todo.java,todoTest.java Pending
77 Binary Tree General 129. Sum Root to Leaf Numbers Medium todo.java,todoTest.java Pending
78 Binary Tree General 124. Binary Tree Maximum Path Sum Hard todo.java,todoTest.java Pending
79 Binary Tree General 173. Binary Search Tree Iterator Medium todo.java,todoTest.java Pending
80 Binary Tree General 222. Count Complete Tree Nodes Easy todo.java,todoTest.java Pending
81 Binary Tree General 236. Lowest Common Ancestor of a Binary Tree Medium todo.java,todoTest.java Pending
82 Binary Tree BFS 199. Binary Tree Right Side View Medium todo.java,todoTest.java Pending
83 Binary Tree BFS 637. Average of Levels in Binary Tree Easy todo.java,todoTest.java Pending
84 Binary Tree BFS 102. Binary Tree Level Order Traversal Medium todo.java,todoTest.java Pending
85 Binary Tree BFS 103. Binary Tree Zigzag Level Order Traversal Medium todo.java,todoTest.java Pending
86 Binary Search Tree 530. Minimum Absolute Difference in BST Easy todo.java,todoTest.java Pending
87 Binary Search Tree 230. Kth Smallest Element in a BST Medium todo.java,todoTest.java Pending
88 Binary Search Tree 98. Validate Binary Search Tree Medium todo.java,todoTest.java Pending
89 Graph General 200. Number of Islands Medium todo.java,todoTest.java Pending
90 Graph General 130. Surrounded Regions Medium todo.java,todoTest.java Pending
91 Graph General 133. Clone Graph Medium todo.java,todoTest.java Pending
92 Graph General 399. Evaluate Division Medium todo.java,todoTest.java Pending
93 Graph General 207. Course Schedule Medium todo.java,todoTest.java Pending
94 Graph General 210. Course Schedule II Medium todo.java,todoTest.java Pending
95 Graph BFS 909. Snakes and Ladders Medium todo.java,todoTest.java Pending
96 Graph BFS 433. Minimum Genetic Mutation Medium todo.java,todoTest.java Pending
97 Graph BFS 127. Word Ladder Hard todo.java,todoTest.java Pending
98 Trie 208. Implement Trie (Prefix Tree) Medium todo.java,todoTest.java Pending
99 Trie 211. Design Add and Search Words Data Structure Medium todo.java,todoTest.java Pending
100 Trie 212. Word Search II Hard todo.java,todoTest.java Pending
101 Backtracking 17. Letter Combinations of a Phone Number Medium todo.java,todoTest.java Pending
102 Backtracking 77. Combinations Medium todo.java,todoTest.java Pending
103 Backtracking 46. Permutations Medium todo.java,todoTest.java Pending
104 Backtracking 39. Combination Sum Medium todo.java,todoTest.java Pending
105 Backtracking 52. N-Queens II Hard todo.java,todoTest.java Pending
106 Backtracking 22. Generate Parentheses Medium todo.java,todoTest.java Pending
107 Backtracking 79. Word Search Medium todo.java,todoTest.java Pending
108 Divide & Conquer 108. Convert Sorted Array to Binary Search Tree Easy todo.java,todoTest.java Pending
109 Divide & Conquer 148. Sort List Medium todo.java,todoTest.java Pending
110 Divide & Conquer 427. Construct Quad Tree Medium todo.java,todoTest.java Pending
111 Divide & Conquer 23. Merge k Sorted Lists Hard todo.java,todoTest.java Pending
112 Kadane's Algorithm 53. Maximum Subarray Medium todo.java,todoTest.java Pending
113 Kadane's Algorithm 918. Maximum Sum Circular Subarray Medium todo.java,todoTest.java Pending
114 Binary Search 35. Search Insert Position Easy todo.java,todoTest.java Pending
115 Binary Search 74. Search a 2D Matrix Medium todo.java,todoTest.java Pending
116 Binary Search 162. Find Peak Element Medium todo.java,todoTest.java Pending
117 Binary Search 33. Search in Rotated Sorted Array Medium todo.java,todoTest.java Pending
118 Binary Search 34. Find First and Last Position of Element in Sorted Array Medium todo.java,todoTest.java Pending
119 Binary Search 153. Find Minimum in Rotated Sorted Array Medium todo.java,todoTest.java Pending
120 Binary Search 4. Median of Two Sorted Arrays Hard todo.java,todoTest.java Pending
121 Heap 215. Kth Largest Element in an Array Medium todo.java,todoTest.java Pending
122 Heap 502. IPO Hard todo.java,todoTest.java Pending
123 Heap 373. Find K Pairs with Smallest Sums Medium todo.java,todoTest.java Pending
124 Heap 295. Find Median from Data Stream Hard todo.java,todoTest.java Pending
125 Bit Manipulation 67. Add Binary Easy todo.java,todoTest.java Pending
126 Bit Manipulation 190. Reverse Bits Easy todo.java,todoTest.java Pending
127 Bit Manipulation 191. Number of 1 Bits Easy todo.java,todoTest.java Pending
128 Bit Manipulation 136. Single Number Easy todo.java,todoTest.java Pending
129 Bit Manipulation 137. Single Number II Medium todo.java,todoTest.java Pending
130 Bit Manipulation 201. Bitwise AND of Numbers Range Medium todo.java,todoTest.java Pending
131 Math 9. Palindrome Number Easy todo.java,todoTest.java Pending
132 Math 66. Plus One Easy todo.java,todoTest.java Pending
133 Math 172. Factorial Trailing Zeroes Medium todo.java,todoTest.java Pending
134 Math 69. Sqrt(x) Easy todo.java,todoTest.java Pending
135 Math 50. Pow(x, n) Medium todo.java,todoTest.java Pending
136 Math 149. Max Points on a Line Hard todo.java,todoTest.java Pending
137 1D DP 70. Climbing Stairs Easy todo.java,todoTest.java Pending
138 1D DP 198. House Robber Medium todo.java,todoTest.java Pending
139 1D DP 139. Word Break Medium todo.java,todoTest.java Pending
140 1D DP 322. Coin Change Medium todo.java,todoTest.java Pending
141 1D DP 300. Longest Increasing Subsequence Medium todo.java,todoTest.java Pending
142 Multidimensional DP 120. Triangle Medium todo.java,todoTest.java Pending
143 Multidimensional DP 64. Minimum Path Sum Medium todo.java,todoTest.java Pending
144 Multidimensional DP 63. Unique Paths II Medium todo.java,todoTest.java Pending
145 Multidimensional DP 5. Longest Palindromic Substring Medium todo.java,todoTest.java Pending
146 Multidimensional DP 97. Interleaving String Medium todo.java,todoTest.java Pending
147 Multidimensional DP 72. Edit Distance Medium todo.java,todoTest.java Pending
148 Multidimensional DP 123. Best Time to Buy and Sell Stock III Hard todo.java,todoTest.java Pending
149 Multidimensional DP 188. Best Time to Buy and Sell Stock IV Hard todo.java,todoTest.java Pending
150 Multidimensional DP 221. Maximal Square Medium todo.java,todoTest.java Pending

TechGig

Package: com.ankitech.techgig

Sl No. Challenge Points Solution
1. Dummy challenge 0 Dummy.java, dummy1.java

HackerEarth

Package: com.ankitech.hackerearth

Sl No. Challenge Points Solution
1. Dummy challenge 0 Dummy.java, dummy1.java

CodeAbbey

Package: com.ankitech.codeabbey

Sl No. Challenge Points Solution
1. Dummy challenge 0 Dummy.java, dummy1.java

Codility

Package: com.ankitech.codility

Sl No. Challenge Points Solution
1. Dummy challenge 0 Dummy.java, dummy1.java

CodeKata

Package: com.ankitech.codekata

Sl No. Challenge Points Solution
1. Dummy challenge 0 Dummy.java, dummy1.java

ProjectEuler

Package: com.ankitech.projecteuler

Sl No. Challenge Points Solution
1. Dummy challenge 0 Dummy.java, dummy1.java

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