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‎README.md‎

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@@ -55,6 +55,7 @@ implementation 'com.github.javadev:leetcode-in-scala:1.0'
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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/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) | 478 | 97.85
5757
| 0033 |[Search in Rotated Sorted Array](src/main/scala/g0001_0100/s0033_search_in_rotated_sorted_array/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) | 453 | 91.53
58+
| 0074 |[Search a 2D Matrix](src/main/scala/g0001_0100/s0074_search_a_2d_matrix/Solution.scala)| Medium | Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) | 478 | 83.33
5859

5960
#### Day 2 Binary Search
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@@ -97,6 +98,7 @@ implementation 'com.github.javadev:leetcode-in-scala:1.0'
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 0078 |[Subsets](src/main/scala/g0001_0100/s0078_subsets/Solution.scala)| 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
100102

101103
#### Day 10 Recursion Backtracking
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@@ -110,6 +112,7 @@ implementation 'com.github.javadev:leetcode-in-scala:1.0'
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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/Solution.scala)| 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/Solution.scala)| 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/Solution.scala)| 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
113116

114117
#### Day 12 Dynamic Programming
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@@ -149,6 +152,7 @@ implementation 'com.github.javadev:leetcode-in-scala:1.0'
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 0072 |[Edit Distance](src/main/scala/g0001_0100/s0072_edit_distance/Solution.scala)| Hard | Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) | 487 | 100.00
152156

153157
#### Day 19 Bit Manipulation
154158

@@ -208,6 +212,7 @@ implementation 'com.github.javadev:leetcode-in-scala:1.0'
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209213
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 0074 |[Search a 2D Matrix](src/main/scala/g0001_0100/s0074_search_a_2d_matrix/Solution.scala)| Medium | Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) | 478 | 83.33
211216

212217
#### Day 9
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@@ -343,6 +348,7 @@ implementation 'com.github.javadev:leetcode-in-scala:1.0'
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 0070 |[Climbing Stairs](src/main/scala/g0001_0100/s0070_climbing_stairs/Solution.scala)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) | 369 | 98.32
346352

347353
#### Day 3
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@@ -418,6 +424,7 @@ implementation 'com.github.javadev:leetcode-in-scala:1.0'
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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| 0064 |[Minimum Path Sum](src/main/scala/g0001_0100/s0064_minimum_path_sum/Solution.scala)| Medium | Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Big_O_Time_O(m\*n)_Space_O(m\*n) | 521 | 92.86
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422429
#### Day 17
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@@ -434,6 +441,7 @@ implementation 'com.github.javadev:leetcode-in-scala:1.0'
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| 0072 |[Edit Distance](src/main/scala/g0001_0100/s0072_edit_distance/Solution.scala)| Hard | Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) | 487 | 100.00
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438446
#### Day 20
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@@ -788,6 +796,7 @@ implementation 'com.github.javadev:leetcode-in-scala:1.0'
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| 0070 |[Climbing Stairs](src/main/scala/g0001_0100/s0070_climbing_stairs/Solution.scala)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) | 369 | 98.32
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#### Day 11 Dynamic Programming
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@@ -858,6 +867,7 @@ implementation 'com.github.javadev:leetcode-in-scala:1.0'
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| 0074 |[Search a 2D Matrix](src/main/scala/g0001_0100/s0074_search_a_2d_matrix/Solution.scala)| Medium | Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) | 478 | 83.33
861871
| 0033 |[Search in Rotated Sorted Array](src/main/scala/g0001_0100/s0033_search_in_rotated_sorted_array/Solution.scala)| 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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#### Day 9 Binary Search Tree
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| 0003 |[Longest Substring Without Repeating Characters](src/main/scala/g0001_0100/s0003_longest_substring_without_repeating_characters/Solution.scala)| 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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| 0076 |[Minimum Window Substring](src/main/scala/g0001_0100/s0076_minimum_window_substring/Solution.scala)| Hard | Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(s.length())_Space_O(1) | 453 | 100.00
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894905
#### Day 15 Tree
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| 0001 |[Two Sum](src/main/scala/g0001_0100/s0001_two_sum/Solution.scala)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n) | 517 | 86.66
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| 0055 |[Jump Game](src/main/scala/g0001_0100/s0055_jump_game/Solution.scala)| 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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| 0075 |[Sort Colors](src/main/scala/g0001_0100/s0075_sort_colors/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n)_Space_O(1) | 450 | 84.21
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| 0041 |[First Missing Positive](src/main/scala/g0001_0100/s0041_first_missing_positive/Solution.scala)| Hard | Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n) | 650 | 100.00
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#### Udemy Two Pointers
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| 0074 |[Search a 2D Matrix](src/main/scala/g0001_0100/s0074_search_a_2d_matrix/Solution.scala)| 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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| 0048 |[Rotate Image](src/main/scala/g0001_0100/s0048_rotate_image/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Big_O_Time_O(n^2)_Space_O(1) | 472 | 66.67
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| 0073 |[Set Matrix Zeroes](src/main/scala/g0001_0100/s0073_set_matrix_zeroes/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix, Big_O_Time_O(m\*n)_Space_O(1) | 557 | 90.91
980994
| 0056 |[Merge Intervals](src/main/scala/g0001_0100/s0056_merge_intervals/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n) | 583 | 90.91
981995

982996
#### Udemy Linked List
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| 0070 |[Climbing Stairs](src/main/scala/g0001_0100/s0070_climbing_stairs/Solution.scala)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) | 369 | 98.32
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| 0064 |[Minimum Path Sum](src/main/scala/g0001_0100/s0064_minimum_path_sum/Solution.scala)| Medium | Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Big_O_Time_O(m\*n)_Space_O(m\*n) | 521 | 92.86
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| 0072 |[Edit Distance](src/main/scala/g0001_0100/s0072_edit_distance/Solution.scala)| Hard | Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) | 487 | 100.00
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| 0010 |[Regular Expression Matching](src/main/scala/g0001_0100/s0010_regular_expression_matching/Solution.scala)| Hard | Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Recursion, Big_O_Time_O(m\*n)_Space_O(m\*n) | 459 | 75.00
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#### Udemy Backtracking/Recursion
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| 0022 |[Generate Parentheses](src/main/scala/g0001_0100/s0022_generate_parentheses/Solution.scala)| 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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| 0039 |[Combination Sum](src/main/scala/g0001_0100/s0039_combination_sum/Solution.scala)| 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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| 0078 |[Subsets](src/main/scala/g0001_0100/s0078_subsets/Solution.scala)| 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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| 0017 |[Letter Combinations of a Phone Number](src/main/scala/g0001_0100/s0017_letter_combinations_of_a_phone_number/Solution.scala)| 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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| 0046 |[Permutations](src/main/scala/g0001_0100/s0046_permutations/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Big_O_Time_O(n\*n!)_Space_O(n+n!) | 470 | 92.31
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| 0074 |[Search a 2D Matrix](src/main/scala/g0001_0100/s0074_search_a_2d_matrix/Solution.scala)| 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 6 String
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| 0075 |[Sort Colors](src/main/scala/g0001_0100/s0075_sort_colors/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n)_Space_O(1) | 450 | 84.21
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| 0056 |[Merge Intervals](src/main/scala/g0001_0100/s0056_merge_intervals/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n) | 583 | 90.91
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#### Day 3 Array
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| 0070 |[Climbing Stairs](src/main/scala/g0001_0100/s0070_climbing_stairs/Solution.scala)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) | 369 | 98.32
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#### Day 13 Bit Manipulation
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| # | Title | Difficulty | Tag | Time, ms | Time, %
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|------|----------------|-------------|-------------|----------|---------
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| 0084 |[Largest Rectangle in Histogram](src/main/scala/g0001_0100/s0084_largest_rectangle_in_histogram/Solution.scala)| Hard | Top_100_Liked_Questions, Top_Interview_Questions, Array, Stack, Monotonic_Stack, Big_O_Time_O(n_log_n)_Space_O(log_n) | 904 | 71.43
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| 0079 |[Word Search](src/main/scala/g0001_0100/s0079_word_search/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Big_O_Time_O(4^(m\*n))_Space_O(m\*n) | 783 | 94.87
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| 0078 |[Subsets](src/main/scala/g0001_0100/s0078_subsets/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(2^n)_Space_O(n\*2^n) | 452 | 87.50
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| 0076 |[Minimum Window Substring](src/main/scala/g0001_0100/s0076_minimum_window_substring/Solution.scala)| Hard | Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Level_2_Day_14_Sliding_Window/Two_Pointer, Big_O_Time_O(s.length())_Space_O(1) | 453 | 100.00
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| 0075 |[Sort Colors](src/main/scala/g0001_0100/s0075_sort_colors/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_2_Array, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1) | 450 | 84.21
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| 0074 |[Search a 2D Matrix](src/main/scala/g0001_0100/s0074_search_a_2d_matrix/Solution.scala)| Medium | Top_100_Liked_Questions, Array, Binary_Search, Matrix, Data_Structure_I_Day_5_Array, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_8, Level_2_Day_8_Binary_Search, Udemy_2D_Arrays/Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) | 478 | 83.33
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| 0073 |[Set Matrix Zeroes](src/main/scala/g0001_0100/s0073_set_matrix_zeroes/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix, Udemy_2D_Arrays/Matrix, Big_O_Time_O(m\*n)_Space_O(1) | 557 | 90.91
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| 0072 |[Edit Distance](src/main/scala/g0001_0100/s0072_edit_distance/Solution.scala)| Hard | Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_19, Udemy_Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) | 487 | 100.00
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| 0070 |[Climbing Stairs](src/main/scala/g0001_0100/s0070_climbing_stairs/Solution.scala)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_2, Level_1_Day_10_Dynamic_Programming, Udemy_Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) | 369 | 98.32
1332+
| 0064 |[Minimum Path Sum](src/main/scala/g0001_0100/s0064_minimum_path_sum/Solution.scala)| Medium | Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16, Udemy_Dynamic_Programming, Big_O_Time_O(m\*n)_Space_O(m\*n) | 521 | 92.86
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| 0062 |[Unique Paths](src/main/scala/g0001_0100/s0062_unique_paths/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_15, Level_1_Day_11_Dynamic_Programming, Big_O_Time_O(m\*n)_Space_O(m\*n) | 405 | 70.18
13031334
| 0056 |[Merge Intervals](src/main/scala/g0001_0100/s0056_merge_intervals/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Data_Structure_II_Day_2_Array, Level_2_Day_17_Interval, Udemy_2D_Arrays/Matrix, Big_O_Time_O(n_log_n)_Space_O(n) | 583 | 90.91
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| 0055 |[Jump Game](src/main/scala/g0001_0100/s0055_jump_game/Solution.scala)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_4, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1) | 622 | 88.31

‎src/main/scala/g0001_0100/s0064_minimum_path_sum/Solution.scala‎

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package g0001_0100.s0064_minimum_path_sum
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// #Medium #Top_100_Liked_Questions #Array #Dynamic_Programming #Matrix
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// #Dynamic_Programming_I_Day_16 #Udemy_Dynamic_Programming #Big_O_Time_O(m*n)_Space_O(m*n)
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// #2023_11_02_Time_521_ms_(92.86%)_Space_59.9_MB_(21.43%)
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object Solution {
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def minPathSum(grid: Array[Array[Int]]): Int = {
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val numRows = grid.length
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val numCols = grid(0).length
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val dp = Array.ofDim[Int](numRows, numCols)
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for (r <- numRows - 1 to 0 by -1) {
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for (c <- numCols - 1 to 0 by -1) {
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if (r == numRows - 1 && c == numCols - 1) {
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dp(r)(c) = grid(r)(c)
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} else if (r == numRows - 1) {
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dp(r)(c) = grid(r)(c) + dp(r)(c + 1)
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} else if (c == numCols - 1) {
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dp(r)(c) = grid(r)(c) + dp(r + 1)(c)
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} else {
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dp(r)(c) = grid(r)(c) + Math.min(dp(r + 1)(c), dp(r)(c + 1))
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}
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}
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}
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dp(0)(0)
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}
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}

‎src/main/scala/g0001_0100/s0064_minimum_path_sum/readme.md‎

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64\. Minimum Path Sum
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Medium
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Given a `m x n` `grid` filled with non-negative numbers, find a path from top left to bottom right, which minimizes the sum of all numbers along its path.
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**Note:** You can only move either down or right at any point in time.
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**Example 1:**
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![](https://assets.leetcode.com/uploads/2020/11/05/minpath.jpg)
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**Input:** grid = [[1,3,1],[1,5,1],[4,2,1]]
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**Output:** 7
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**Explanation:** Because the path 1 → 3 → 1 → 1 → 1 minimizes the sum.
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**Example 2:**
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**Input:** grid = [[1,2,3],[4,5,6]]
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**Output:** 12
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**Constraints:**
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* `m == grid.length`
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* `n == grid[i].length`
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* `1 <= m, n <= 200`
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* `0 <= grid[i][j] <= 100`

‎src/main/scala/g0001_0100/s0070_climbing_stairs/Solution.scala‎

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package g0001_0100.s0070_climbing_stairs
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// #Easy #Top_100_Liked_Questions #Top_Interview_Questions #Dynamic_Programming #Math #Memoization
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// #Algorithm_I_Day_12_Dynamic_Programming #Dynamic_Programming_I_Day_2
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// #Level_1_Day_10_Dynamic_Programming #Udemy_Dynamic_Programming #Big_O_Time_O(n)_Space_O(n)
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// #2023_11_02_Time_369_ms_(98.32%)_Space_52_MB_(32.77%)
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object Solution {
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def climbStairs(n: Int): Int = {
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if (n < 2) {
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return n
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}
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val cache = new Array[Int](n)
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// Initialize the cache for the first two steps
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cache(0) = 1
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cache(1) = 2
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// Fill in the cache using a loop
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for (i <- 2 until n) {
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cache(i) = cache(i - 1) + cache(i - 2)
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}
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cache(n - 1)
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}
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}

‎src/main/scala/g0001_0100/s0070_climbing_stairs/readme.md‎

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70\. Climbing Stairs
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Easy
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You are climbing a staircase. It takes `n` steps to reach the top.
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Each time you can either climb `1` or `2` steps. In how many distinct ways can you climb to the top?
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**Example 1:**
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**Input:** n = 2
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**Output:** 2
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**Explanation:** There are two ways to climb to the top. 1. 1 step + 1 step 2. 2 steps
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**Example 2:**
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**Input:** n = 3
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**Output:** 3
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**Explanation:** There are three ways to climb to the top. 1. 1 step + 1 step + 1 step 2. 1 step + 2 steps 3. 2 steps + 1 step
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**Constraints:**
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* `1 <= n <= 45`

‎src/main/scala/g0001_0100/s0072_edit_distance/Solution.scala‎

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package g0001_0100.s0072_edit_distance
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// #Hard #Top_100_Liked_Questions #String #Dynamic_Programming
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// #Algorithm_II_Day_18_Dynamic_Programming #Dynamic_Programming_I_Day_19
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// #Udemy_Dynamic_Programming #Big_O_Time_O(n^2)_Space_O(n2)
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// #2023_11_02_Time_487_ms_(100.00%)_Space_55.3_MB_(100.00%)
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object Solution {
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def minDistance(w1: String, w2: String): Int = {
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val n1 = w1.length
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val n2 = w2.length
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if (n2 > n1) {
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return minDistance(w2, w1)
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}
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var dp = Array.range(0, n2 + 1)
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for (j <- 0 to n2) {
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dp(j) = j
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}
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for (i <- 1 to n1) {
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var pre = dp(0)
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dp(0) = i
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for (j <- 1 to n2) {
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val tmp = dp(j)
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dp(j) =
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if (w1(i - 1) != w2(j - 1))
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1 + Math.min(pre, Math.min(dp(j), dp(j - 1)))
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else
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pre
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pre = tmp
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}
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}
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dp(n2)
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}
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}

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