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3 | 3 |
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4 | 4 | | # | Problem Statement| Solution (Java) | Related Topics | Difficulty | |
5 | 5 | | ----- | ------------- | ------------- |------------- | ------------- | |
6 | | -| Day 1 | [Invert Binary Tree](https://leetcode.com/problems/invert-binary-tree/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/1.%20Invert%20Binary%20Tree/Solution.java) | Tree |  | |
7 | | -| Day 2 | [Delete Node in a Linked List](https://leetcode.com/problems/delete-node-in-a-linked-list/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/2.%20Delete%20Node%20in%20a%20Linked%20List/Solution.java) | Linked List |  | |
8 | | -| Day 3 | [Two City Scheduling](https://leetcode.com/problems/two-city-scheduling/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/3.%20Two%20City%20Scheduling/Solution.java) | Greedy |  | |
9 | | -| Day 4 | [Reverse String](https://leetcode.com/problems/reverse-string/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/4.%20Reverse%20String/Solution.java) | Two Pointers, String |  | |
10 | | -| Day 5 | [Random Pick with Weight](https://leetcode.com/problems/random-pick-with-weight/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/5.%20Random%20Pick%20by%20Weight/Solution.java) | Binary Search, Random |  | |
11 | | -| Day 6 | [Queue Reconstruction by Height](https://leetcode.com/problems/queue-reconstruction-by-height/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/6.%20Queue%20Reconstuction%20by%20Height/Solution.java) | Greedy |  | |
12 | | -| Day 7 | [Coin Change 2](https://leetcode.com/problems/coin-change-2/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/7.%20Coin%20Change%202/Solution.java) | DP |  | |
13 | | -| Day 8 | [Power of Two](https://leetcode.com/problems/power-of-two/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/8.%20Power%20of%202/Solution.java) | Math, Bit Manipulation |  | |
14 | | -| Day 9 | [Is Subsequence](https://leetcode.com/problems/is-subsequence/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/9.%20Is%20Subsequence/Solution.java) | Binary Search, DP, Greedy |  | |
15 | | -| Day 10 | [Search Insert Position](https://leetcode.com/problems/search-insert-position/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/10.%20Search%20Insert%20at%20Position/Solution.java) | Array, Binary Search |  | |
16 | | -| Day 11 | [Sort Colors](https://leetcode.com/problems/sort-colors/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/11.%20Sort%20Colors/Solution.java) | Array, Two Pointers, Sort |  | |
17 | | -| Day 12 | [Insert Delete GetRandom O(1)](https://leetcode.com/problems/insert-delete-getrandom-o1/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/12.%20Insert%20Delete%20GetRandom%20O(1)/Solution.java) | Array, HashTable |  | |
18 | | -| Day 13 | [Largest Divisible Subset](https://leetcode.com/problems/largest-divisible-subset/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/13.%20Largest%20Divisible%20Subset/Solution.java) | Math, DP |  | |
19 | | -| Day 14 | [Cheapest Flights Within K Stops](https://leetcode.com/problems/cheapest-flights-within-k-stops/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/14.%20Cheapest%20Flights%20Within%20K%20Stops/Solution.java) | DP, Heap, BFS |  | |
20 | | -| Day 15 | [Search in a Binary Search Tree](https://leetcode.com/problems/search-in-a-binary-search-tree/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/15.%20Search%20in%20a%20Binary%20Search%20Tree/Solution.java) | Tree |  | |
21 | | -| Day 16 | [Validate IP Address](https://leetcode.com/problems/validate-ip-address/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/16.%20Validate%20IP%20Address/Solution.java) | String |  | |
22 | | -| Day 17 | [Surrounded Regions](https://leetcode.com/problems/surrounded-regions/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/17.%20Surrounded%20Regions/Solution.java) | BFS, DFS |  | |
23 | | -| Day 18 | [H-Index II](https://leetcode.com/problems/h-index-ii/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/18.%20H%20Index%20-%20II/Solution.java) | Binary Search |  | |
24 | | -| Day 19 | [Longest Duplicate Substring](https://leetcode.com/problems/longest-duplicate-substring/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/19.%20Longest%20Duplicate%20Substring/Solution.java) | Hash Table, Binary Search |  | |
25 | | -| Day 20 | [Permutation Sequence](https://leetcode.com/problems/permutation-sequence/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/20.%20Permutation%20Sequence/Solution.java) | Math, Backtracking |  | |
26 | | -| Day 21 | [Dungeon Game](https://leetcode.com/problems/dungeon-game/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/21.%20Dungeon%20Game/Solution.java) | Binary Search, DP |  | |
27 | | -| Day 22 | [Single Numeber II](https://leetcode.com/problems/single-number-ii/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/22.%20Single%20Numeber%20II/Solution.java) | Bit Manipulation |  | |
28 | | -| Day 23 | [Count Complete Tree Nodes](https://leetcode.com/problems/count-complete-tree-nodes/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/23.%20Count%20Complete%20Tree%20Nodes/Solution.java) | Binary Search, Tree |  | |
29 | | -| Day 24 | [Unique Binary Search Trees](https://leetcode.com/problems/unique-binary-search-trees/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode/June%20Challenge/24.%20Unique%20Binary%20Search%20Trees/Solution.java) | DP, Tree |  | |
30 | | -| Day 25 | [Find the Duplicate Number](https://leetcode.com/problems/find-the-duplicate-number/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/25.%20Find%20the%20Duplicate%20Number/Solution.java) | Two Pointers, Binary Search |  | |
31 | | -| Day 26 | [Sum Root to Leaf Numbers](https://leetcode.com/problems/sum-root-to-leaf-numbers/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/26.%20Sum%20Root%20to%20Leaf%20Numbers/Solution.java) | Tree, DFS |  | |
32 | | -| Day 27 | [Perfect Squares](https://leetcode.com/problems/perfect-squares/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/27.%20Perfect%20Squares/Solution.java) | Math, DP, BFS |  | |
33 | | -| Day 28 | [Reconstruct Itinerary](https://leetcode.com/problems/reconstruct-itinerary/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/27.%20Perfect%20Squares/Solution.java) | DFS, Graph |  | |
34 | | -| Day 29 | [Unique Paths](https://leetcode.com/problems/unique-paths/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/29.%20Unique%20Paths/Solution.java) | Array, DP |  | |
35 | | -| Day 30 | [Word Search II](https://leetcode.com/problems/word-search-ii/) | [Solution](https://github.com/rohitkumar-rk/Problem-Solving/blob/master/LeetCode%20June%20Challenge/30.%20Word%20Search%20II/Solution.java) | Backtracking, Trie |  | |
36 | | - |
| 6 | +| Day 1 | [Invert Binary Tree](https://leetcode.com/problems/invert-binary-tree/) | [Solution](./1.%20Invert%20Binary%20Tree/Solution.java) | Tree |  | |
| 7 | +| Day 2 | [Delete Node in a Linked List](https://leetcode.com/problems/delete-node-in-a-linked-list/) | [Solution](./2.%20Delete%20Node%20in%20a%20Linked%20List/Solution.java) | Linked List |  | |
| 8 | +| Day 3 | [Two City Scheduling](https://leetcode.com/problems/two-city-scheduling/) | [Solution](./3.%20Two%20City%20Scheduling/Solution.java) | Greedy |  | |
| 9 | +| Day 4 | [Reverse String](https://leetcode.com/problems/reverse-string/) | [Solution](./4.%20Reverse%20String/Solution.java) | Two Pointers, String |  | |
| 10 | +| Day 5 | [Random Pick with Weight](https://leetcode.com/problems/random-pick-with-weight/) | [Solution](./5.%20Random%20Pick%20by%20Weight/Solution.java) | Binary Search, Random |  | |
| 11 | +| Day 6 | [Queue Reconstruction by Height](https://leetcode.com/problems/queue-reconstruction-by-height/) | [Solution]./6.%20Queue%20Reconstuction%20by%20Height/Solution.java) | Greedy |  | |
| 12 | +| Day 7 | [Coin Change 2](https://leetcode.com/problems/coin-change-2/) | [Solution](./7.%20Coin%20Change%202/Solution.java) | DP |  | |
| 13 | +| Day 8 | [Power of Two](https://leetcode.com/problems/power-of-two/) | [Solution]./8.%20Power%20of%202/Solution.java) | Math, Bit Manipulation |  | |
| 14 | +| Day 9 | [Is Subsequence](https://leetcode.com/problems/is-subsequence/) | [Solution](./9.%20Is%20Subsequence/Solution.java) | Binary Search, DP, Greedy |  | |
| 15 | +| Day 10 | [Search Insert Position](https://leetcode.com/problems/search-insert-position/) | [Solution](./10.%20Search%20Insert%20at%20Position/Solution.java) | Array, Binary Search |  | |
| 16 | +| Day 11 | [Sort Colors](https://leetcode.com/problems/sort-colors/) | [Solution](./11.%20Sort%20Colors/Solution.java) | Array, Two Pointers, Sort |  | |
| 17 | +| Day 12 | [Insert Delete GetRandom O(1)](https://leetcode.com/problems/insert-delete-getrandom-o1/) | [Solution](./12.%20Insert%20Delete%20GetRandom%20O(1)/Solution.java) | Array, HashTable |  | |
| 18 | +| Day 13 | [Largest Divisible Subset](https://leetcode.com/problems/largest-divisible-subset/) | [Solution](./13.%20Largest%20Divisible%20Subset/Solution.java) | Math, DP |  | |
| 19 | +| Day 14 | [Cheapest Flights Within K Stops](https://leetcode.com/problems/cheapest-flights-within-k-stops/) | [Solution](./14.%20Cheapest%20Flights%20Within%20K%20Stops/Solution.java) | DP, Heap, BFS |  | |
| 20 | +| Day 15 | [Search in a Binary Search Tree](https://leetcode.com/problems/search-in-a-binary-search-tree/) | [Solution](./15.%20Search%20in%20a%20Binary%20Search%20Tree/Solution.java) | Tree |  | |
| 21 | +| Day 16 | [Validate IP Address](https://leetcode.com/problems/validate-ip-address/) | [Solution](./16.%20Validate%20IP%20Address/Solution.java) | String |  | |
| 22 | +| Day 17 | [Surrounded Regions](https://leetcode.com/problems/surrounded-regions/) | [Solution](./17.%20Surrounded%20Regions/Solution.java) | BFS, DFS |  | |
| 23 | +| Day 18 | [H-Index II](https://leetcode.com/problems/h-index-ii/) | [Solution](./18.%20H%20Index%20-%20II/Solution.java) | Binary Search |  | |
| 24 | +| Day 19 | [Longest Duplicate Substring](https://leetcode.com/problems/longest-duplicate-substring/) | [Solution]./19.%20Longest%20Duplicate%20Substring/Solution.java) | Hash Table, Binary Search |  | |
| 25 | +| Day 20 | [Permutation Sequence](https://leetcode.com/problems/permutation-sequence/) | [Solution](./20.%20Permutation%20Sequence/Solution.java) | Math, Backtracking |  | |
| 26 | +| Day 21 | [Dungeon Game](https://leetcode.com/problems/dungeon-game/) | [Solution](./21.%20Dungeon%20Game/Solution.java) | Binary Search, DP |  | |
| 27 | +| Day 22 | [Single Numeber II](https://leetcode.com/problems/single-number-ii/) | [Solution](./22.%20Single%20Numeber%20II/Solution.java) | Bit Manipulation |  | |
| 28 | +| Day 23 | [Count Complete Tree Nodes](https://leetcode.com/problems/count-complete-tree-nodes/) | [Solution](./23.%20Count%20Complete%20Tree%20Nodes/Solution.java) | Binary Search, Tree |  | |
| 29 | +| Day 24 | [Unique Binary Search Trees](https://leetcode.com/problems/unique-binary-search-trees/) | [Solution](./24.%20Unique%20Binary%20Search%20Trees/Solution.java) | DP, Tree |  | |
| 30 | +| Day 25 | [Find the Duplicate Number](https://leetcode.com/problems/find-the-duplicate-number/) | [Solution](./25.%20Find%20the%20Duplicate%20Number/Solution.java) | Two Pointers, Binary Search |  | |
| 31 | +| Day 26 | [Sum Root to Leaf Numbers](https://leetcode.com/problems/sum-root-to-leaf-numbers/) | [Solution](./26.%20Sum%20Root%20to%20Leaf%20Numbers/Solution.java) | Tree, DFS |  | |
| 32 | +| Day 27 | [Perfect Squares](https://leetcode.com/problems/perfect-squares/) | [Solution](./27.%20Perfect%20Squares/Solution.java) | Math, DP, BFS |  | |
| 33 | +| Day 28 | [Reconstruct Itinerary](https://leetcode.com/problems/reconstruct-itinerary/) | [Solution](./27.%20Perfect%20Squares/Solution.java) | DFS, Graph |  | |
| 34 | +| Day 29 | [Unique Paths](https://leetcode.com/problems/unique-paths/) | [Solution](h./29.%20Unique%20Paths/Solution.java) | Array, DP |  | |
| 35 | +| Day 30 | [Word Search II](https://leetcode.com/problems/word-search-ii/) | [Solution](./30.%20Word%20Search%20II/Solution.java) | Backtracking, Trie |  | |
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