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[![](https://img.shields.io/github/forks/LeetCode-in-Scala/LeetCode-in-Scala?label=Fork%20me%20on%20GitHub%20&style=flat-square)](https://github.com/LeetCode-in-Scala/LeetCode-in-Scala/fork)
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> ["For coding interview preparation, LeetCode is one of the best online resource providing a rich library of more than 300 real coding interview questions for you to practice from using one of the 7 supported languages - C, C++, Java, Python, C#, JavaScript, Ruby."](https://www.quora.com/How-effective-is-Leetcode-for-preparing-for-technical-interviews)
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* [Algorithm II](#algorithm-ii)
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* [Binary Search I](#binary-search-i)
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* [Binary Search II](#binary-search-ii)
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* [Dynamic Programming I](#dynamic-programming-i)
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* [Data Structure I](#data-structure-i)
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* [Data Structure II](#data-structure-ii)
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* [Algorithm I](#algorithm-i)
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### Algorithm II
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#### Day 1 Binary Search
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 0034 |[Find First and Last Position of Element in Sorted Array](src/main/scala/g0001_0100/s0034_find_first_and_last_position_of_element_in_sorted_array)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) | 478 | 97.85
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| 0033 |[Search in Rotated Sorted Array](src/main/scala/g0001_0100/s0033_search_in_rotated_sorted_array)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) | 453 | 91.53
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| 0074 |[Search a 2D Matrix](src/main/scala/g0001_0100/s0074_search_a_2d_matrix)| Medium | Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) | 478 | 83.33
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#### Day 2 Binary Search
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 0153 |[Find Minimum in Rotated Sorted Array](src/main/scala/g0101_0200/s0153_find_minimum_in_rotated_sorted_array)| Medium | Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_N)_Space_O(log_N) | 457 | 78.79
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#### Day 3 Two Pointers
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 0015 |[3Sum](src/main/scala/g0001_0100/s0015_3sum)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n\*log(n))_Space_O(n^2) | 721 | 95.24
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#### Day 4 Two Pointers
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 0011 |[Container With Most Water](src/main/scala/g0001_0100/s0011_container_with_most_water)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Big_O_Time_O(n)_Space_O(1) | 683 | 99.13
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#### Day 5 Sliding Window
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 0438 |[Find All Anagrams in a String](src/main/scala/g0401_0500/s0438_find_all_anagrams_in_a_string)| Medium | Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1) | 576 | 100.00
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#### Day 6 Breadth First Search Depth First Search
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 0200 |[Number of Islands](src/main/scala/g0101_0200/s0200_number_of_islands)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M\*N)_Space_O(M\*N) | 537 | 93.18
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#### Day 7 Breadth First Search Depth First Search
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|-|-|-|-|-|-
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#### Day 8 Breadth First Search Depth First Search
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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#### Day 9 Recursion Backtracking
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|-|-|-|-|-|-
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| 0078 |[Subsets](src/main/scala/g0001_0100/s0078_subsets)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Big_O_Time_O(2^n)_Space_O(n\*2^n) | 452 | 87.50
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#### Day 10 Recursion Backtracking
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 0039 |[Combination Sum](src/main/scala/g0001_0100/s0039_combination_sum)| Medium | Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(2^n)_Space_O(n+2^n) | 488 | 97.50
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#### Day 11 Recursion Backtracking
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 0017 |[Letter Combinations of a Phone Number](src/main/scala/g0001_0100/s0017_letter_combinations_of_a_phone_number)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Big_O_Time_O(4^n)_Space_O(n) | 459 | 58.54
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| 0022 |[Generate Parentheses](src/main/scala/g0001_0100/s0022_generate_parentheses)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Big_O_Time_O(2^n)_Space_O(n) | 380 | 100.00
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| 0079 |[Word Search](src/main/scala/g0001_0100/s0079_word_search)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Big_O_Time_O(4^(m\*n))_Space_O(m\*n) | 783 | 94.87
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#### Day 12 Dynamic Programming
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| 0055 |[Jump Game](src/main/scala/g0001_0100/s0055_jump_game)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1) | 622 | 88.31
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#### Day 13 Dynamic Programming
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| 0045 |[Jump Game II](src/main/scala/g0001_0100/s0045_jump_game_ii)| Medium | Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1) | 510 | 88.52
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| 0062 |[Unique Paths](src/main/scala/g0001_0100/s0062_unique_paths)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Big_O_Time_O(m\*n)_Space_O(m\*n) | 405 | 70.18
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#### Day 14 Dynamic Programming
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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| 0005 |[Longest Palindromic Substring](src/main/scala/g0001_0100/s0005_longest_palindromic_substring)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) | 502 | 87.65
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#### Day 15 Dynamic Programming
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| 0139 |[Word Break](src/main/scala/g0101_0200/s0139_word_break)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Big_O_Time_O(M+max\*N)_Space_O(M+N+max) | 482 | 66.67
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#### Day 16 Dynamic Programming
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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| 0300 |[Longest Increasing Subsequence](src/main/scala/g0201_0300/s0300_longest_increasing_subsequence)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n\*log_n)_Space_O(n) | 522 | 88.89
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#### Day 17 Dynamic Programming
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| 1143 |[Longest Common Subsequence](src/main/scala/g1101_1200/s1143_longest_common_subsequence)| Medium | Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n\*m)_Space_O(n\*m) | 507 | 100.00
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#### Day 18 Dynamic Programming
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| 0072 |[Edit Distance](src/main/scala/g0001_0100/s0072_edit_distance)| Hard | Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) | 487 | 100.00
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| 0322 |[Coin Change](src/main/scala/g0301_0400/s0322_coin_change)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m\*n)_Space_O(amount) | 533 | 84.21
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#### Day 19 Bit Manipulation
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#### Day 20 Others
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#### Day 21 Others
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* [Algorithm II](#algorithm-ii)
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### Binary Search I
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| 0394 |[Decode String](src/main/scala/g0301_0400/s0394_decode_string)| Medium | Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n) | 476 | 10.00
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| 0394 |[Decode String](src/main/scala/g0301_0400/s0394_decode_string)| Medium | Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n) | 449 | 50.00
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#### Day 15 Heap
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| 0003 |[Longest Substring Without Repeating Characters](src/main/scala/g0001_0100/s0003_longest_substring_without_repeating_characters)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1) | 482 | 96.91
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| 0020 |[Valid Parentheses](src/main/scala/g0001_0100/s0020_valid_parentheses)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n) | 449 | 65.58
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| 0005 |[Longest Palindromic Substring](src/main/scala/g0001_0100/s0005_longest_palindromic_substring)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) | 502 | 87.65
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| 0394 |[Decode String](src/main/scala/g0301_0400/s0394_decode_string)| Medium | Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n) | 476 | 10.00
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| 0394 |[Decode String](src/main/scala/g0301_0400/s0394_decode_string)| Medium | Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n) | 449 | 50.00
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| 0049 |[Group Anagrams](src/main/scala/g0001_0100/s0049_group_anagrams)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n\*k_log_k)_Space_O(n) | 618 | 91.67
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#### Udemy Binary Search
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| 0136 |[Single Number](src/main/scala/g0101_0200/s0136_single_number)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Big_O_Time_O(N)_Space_O(1) | 530 | 78.57
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### Algorithm II
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#### Day 1 Binary Search
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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| 0034 |[Find First and Last Position of Element in Sorted Array](src/main/scala/g0001_0100/s0034_find_first_and_last_position_of_element_in_sorted_array)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) | 478 | 97.85
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| 0033 |[Search in Rotated Sorted Array](src/main/scala/g0001_0100/s0033_search_in_rotated_sorted_array)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) | 453 | 91.53
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| 0074 |[Search a 2D Matrix](src/main/scala/g0001_0100/s0074_search_a_2d_matrix)| Medium | Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) | 478 | 83.33
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#### Day 2 Binary Search
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| 0153 |[Find Minimum in Rotated Sorted Array](src/main/scala/g0101_0200/s0153_find_minimum_in_rotated_sorted_array)| Medium | Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_N)_Space_O(log_N) | 457 | 78.79
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#### Day 3 Two Pointers
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| 0015 |[3Sum](src/main/scala/g0001_0100/s0015_3sum)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n\*log(n))_Space_O(n^2) | 721 | 95.24
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#### Day 4 Two Pointers
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| 0011 |[Container With Most Water](src/main/scala/g0001_0100/s0011_container_with_most_water)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Big_O_Time_O(n)_Space_O(1) | 683 | 99.13
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#### Day 5 Sliding Window
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| 0438 |[Find All Anagrams in a String](src/main/scala/g0401_0500/s0438_find_all_anagrams_in_a_string)| Medium | Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1) | 576 | 100.00
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#### Day 6 Breadth First Search Depth First Search
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| 0200 |[Number of Islands](src/main/scala/g0101_0200/s0200_number_of_islands)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M\*N)_Space_O(M\*N) | 537 | 93.18
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#### Day 7 Breadth First Search Depth First Search
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#### Day 8 Breadth First Search Depth First Search
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#### Day 9 Recursion Backtracking
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| 0078 |[Subsets](src/main/scala/g0001_0100/s0078_subsets)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Big_O_Time_O(2^n)_Space_O(n\*2^n) | 452 | 87.50
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#### Day 10 Recursion Backtracking
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| 0039 |[Combination Sum](src/main/scala/g0001_0100/s0039_combination_sum)| Medium | Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(2^n)_Space_O(n+2^n) | 488 | 97.50
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#### Day 11 Recursion Backtracking
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| 0017 |[Letter Combinations of a Phone Number](src/main/scala/g0001_0100/s0017_letter_combinations_of_a_phone_number)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Big_O_Time_O(4^n)_Space_O(n) | 459 | 58.54
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| 0022 |[Generate Parentheses](src/main/scala/g0001_0100/s0022_generate_parentheses)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Big_O_Time_O(2^n)_Space_O(n) | 380 | 100.00
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| 0079 |[Word Search](src/main/scala/g0001_0100/s0079_word_search)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Big_O_Time_O(4^(m\*n))_Space_O(m\*n) | 783 | 94.87
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#### Day 12 Dynamic Programming
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| 0055 |[Jump Game](src/main/scala/g0001_0100/s0055_jump_game)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1) | 622 | 88.31
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#### Day 13 Dynamic Programming
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| 0045 |[Jump Game II](src/main/scala/g0001_0100/s0045_jump_game_ii)| Medium | Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1) | 510 | 88.52
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| 0062 |[Unique Paths](src/main/scala/g0001_0100/s0062_unique_paths)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Big_O_Time_O(m\*n)_Space_O(m\*n) | 405 | 70.18
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#### Day 14 Dynamic Programming
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| 0005 |[Longest Palindromic Substring](src/main/scala/g0001_0100/s0005_longest_palindromic_substring)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) | 502 | 87.65
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#### Day 15 Dynamic Programming
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| 0139 |[Word Break](src/main/scala/g0101_0200/s0139_word_break)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Big_O_Time_O(M+max\*N)_Space_O(M+N+max) | 482 | 66.67
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#### Day 16 Dynamic Programming
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| 0300 |[Longest Increasing Subsequence](src/main/scala/g0201_0300/s0300_longest_increasing_subsequence)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n\*log_n)_Space_O(n) | 522 | 88.89
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#### Day 17 Dynamic Programming
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| 1143 |[Longest Common Subsequence](src/main/scala/g1101_1200/s1143_longest_common_subsequence)| Medium | Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n\*m)_Space_O(n\*m) | 507 | 100.00
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#### Day 18 Dynamic Programming
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| 0072 |[Edit Distance](src/main/scala/g0001_0100/s0072_edit_distance)| Hard | Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) | 487 | 100.00
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| 0322 |[Coin Change](src/main/scala/g0301_0400/s0322_coin_change)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m\*n)_Space_O(amount) | 533 | 84.21
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#### Day 19 Bit Manipulation
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#### Day 20 Others
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#### Day 21 Others
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## Algorithms
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| # | Title | Difficulty | Tag | Time, ms | Time, %
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| 0438 |[Find All Anagrams in a String](src/main/scala/g0401_0500/s0438_find_all_anagrams_in_a_string)| Medium | Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Programming_Skills_II_Day_12, Level_1_Day_12_Sliding_Window/Two_Pointer, Big_O_Time_O(n+m)_Space_O(1) | 576 | 100.00
14131413
| 0437 |[Path Sum III](src/main/scala/g0401_0500/s0437_path_sum_iii)| Medium | Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree, Big_O_Time_O(n)_Space_O(n) | 498 | 90.91
14141414
| 0416 |[Partition Equal Subset Sum](src/main/scala/g0401_0500/s0416_partition_equal_subset_sum)| Medium | Top_100_Liked_Questions, Array, Dynamic_Programming, Level_2_Day_13_Dynamic_Programming, Big_O_Time_O(n\*sums)_Space_O(n\*sums) | 577 | 100.00
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| 0394 |[Decode String](src/main/scala/g0301_0400/s0394_decode_string)| Medium | Top_100_Liked_Questions, String, Stack, Recursion, Level_1_Day_14_Stack, Udemy_Strings, Big_O_Time_O(n)_Space_O(n) | 476 | 10.00
1415+
| 0394 |[Decode String](src/main/scala/g0301_0400/s0394_decode_string)| Medium | Top_100_Liked_Questions, String, Stack, Recursion, Level_1_Day_14_Stack, Udemy_Strings, Big_O_Time_O(n)_Space_O(n) | 449 | 50.00
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| 0347 |[Top K Frequent Elements](src/main/scala/g0301_0400/s0347_top_k_frequent_elements)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort, Data_Structure_II_Day_20_Heap_Priority_Queue, Big_O_Time_O(n\*log(n))_Space_O(k) | 589 | 93.24
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| 0338 |[Counting Bits](src/main/scala/g0301_0400/s0338_counting_bits)| Easy | Top_100_Liked_Questions, Dynamic_Programming, Bit_Manipulation, Udemy_Bit_Manipulation, Big_O_Time_O(num)_Space_O(num) | 447 | 92.68
14181418
| 0322 |[Coin Change](src/main/scala/g0301_0400/s0322_coin_change)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_20, Level_2_Day_12_Dynamic_Programming, Big_O_Time_O(m\*n)_Space_O(amount) | 533 | 84.21

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