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‎README.md‎

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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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| 0074 |[Search a 2D Matrix](src/main/dart/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) | 321 | 90.28
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#### Day 6 String
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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| 0075 |[Sort Colors](src/main/dart/g0001_0100/s0075_sort_colors)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n)_Space_O(1) | 314 | 79.31
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| 0056 |[Merge Intervals](src/main/dart/g0001_0100/s0056_merge_intervals)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n) | 376 | 100.00
108111

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#### Day 3 Array
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 0070 |[Climbing Stairs](src/main/dart/g0001_0100/s0070_climbing_stairs)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) | 301 | 81.01
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#### Day 13 Bit Manipulation
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|-|-|-|-|-|-
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| 0034 |[Find First and Last Position of Element in Sorted Array](src/main/dart/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) | 321 | 92.86
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| 0033 |[Search in Rotated Sorted Array](src/main/dart/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) | 317 | 91.14
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| 0074 |[Search a 2D Matrix](src/main/dart/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) | 321 | 90.28
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#### Day 2 Binary Search
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 0078 |[Subsets](src/main/dart/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) | 296 | 96.88
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#### Day 10 Recursion Backtracking
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|-|-|-|-|-|-
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| 0045 |[Jump Game II](src/main/dart/g0001_0100/s0045_jump_game_ii)| Medium | Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1) | 335 | 81.58
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| 0062 |[Unique Paths](src/main/dart/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) | 287 | 91.67
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#### Day 14 Dynamic Programming
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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| 0072 |[Edit Distance](src/main/dart/g0001_0100/s0072_edit_distance)| Medium | Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) | 333 | 100.00
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#### Day 19 Bit Manipulation
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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| 0074 |[Search a 2D Matrix](src/main/dart/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) | 321 | 90.28
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#### Day 9
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| 0070 |[Climbing Stairs](src/main/dart/g0001_0100/s0070_climbing_stairs)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) | 301 | 81.01
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#### Day 3
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| 0062 |[Unique Paths](src/main/dart/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) | 287 | 91.67
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#### Day 16
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| 0064 |[Minimum Path Sum](src/main/dart/g0001_0100/s0064_minimum_path_sum)| Medium | Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Big_O_Time_O(m\*n)_Space_O(m\*n) | 328 | 88.89
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#### Day 17
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| 0072 |[Edit Distance](src/main/dart/g0001_0100/s0072_edit_distance)| Medium | Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) | 333 | 100.00
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#### Day 20
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| 0070 |[Climbing Stairs](src/main/dart/g0001_0100/s0070_climbing_stairs)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) | 301 | 81.01
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#### Day 11 Dynamic Programming
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| 0062 |[Unique Paths](src/main/dart/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) | 287 | 91.67
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| 0074 |[Search a 2D Matrix](src/main/dart/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) | 321 | 90.28
10951111
| 0033 |[Search in Rotated Sorted Array](src/main/dart/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) | 317 | 91.14
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#### Day 9 Binary Search Tree
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| 0003 |[Longest Substring Without Repeating Characters](src/main/dart/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) | 336 | 99.68
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| 0076 |[Minimum Window Substring](src/main/dart/g0001_0100/s0076_minimum_window_substring)| Hard | Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(s.length())_Space_O(1) | 337 | 92.86
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| 0056 |[Merge Intervals](src/main/dart/g0001_0100/s0056_merge_intervals)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n) | 376 | 100.00
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| 0001 |[Two Sum](src/main/dart/g0001_0100/s0001_two_sum)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n), AI_can_be_used_to_solve_the_task | 305 | 99.57
11891207
| 0055 |[Jump Game](src/main/dart/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) | 331 | 97.53
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| 0075 |[Sort Colors](src/main/dart/g0001_0100/s0075_sort_colors)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n)_Space_O(1) | 314 | 79.31
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| 0041 |[First Missing Positive](src/main/dart/g0001_0100/s0041_first_missing_positive)| Hard | Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n) | 355 | 85.19
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#### Udemy Two Pointers
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| 0074 |[Search a 2D Matrix](src/main/dart/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) | 321 | 90.28
12141234
| 0048 |[Rotate Image](src/main/dart/g0001_0100/s0048_rotate_image)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Big_O_Time_O(n^2)_Space_O(1) | 311 | 90.24
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| 0073 |[Set Matrix Zeroes](src/main/dart/g0001_0100/s0073_set_matrix_zeroes)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix, Big_O_Time_O(m\*n)_Space_O(1) | 350 | 91.30
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| 0056 |[Merge Intervals](src/main/dart/g0001_0100/s0056_merge_intervals)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n) | 376 | 100.00
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| 0070 |[Climbing Stairs](src/main/dart/g0001_0100/s0070_climbing_stairs)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) | 301 | 81.01
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| 0064 |[Minimum Path Sum](src/main/dart/g0001_0100/s0064_minimum_path_sum)| Medium | Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Big_O_Time_O(m\*n)_Space_O(m\*n) | 328 | 88.89
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| 0072 |[Edit Distance](src/main/dart/g0001_0100/s0072_edit_distance)| Medium | Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) | 333 | 100.00
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| 0010 |[Regular Expression Matching](src/main/dart/g0001_0100/s0010_regular_expression_matching)| Hard | Top_Interview_Questions, String, Dynamic_Programming, Recursion, Big_O_Time_O(m\*n)_Space_O(m\*n) | 341 | 81.82
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| 0022 |[Generate Parentheses](src/main/dart/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) | 312 | 79.37
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| 0039 |[Combination Sum](src/main/dart/g0001_0100/s0039_combination_sum)| Medium | Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(2^n)_Space_O(n+2^n) | 316 | 96.88
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| 0078 |[Subsets](src/main/dart/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) | 296 | 96.88
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| 0017 |[Letter Combinations of a Phone Number](src/main/dart/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) | 293 | 92.50
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| 0046 |[Permutations](src/main/dart/g0001_0100/s0046_permutations)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Big_O_Time_O(n\*n!)_Space_O(n+n!) | 319 | 80.00
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| # | Title | Difficulty | Tag | Time, ms | Time, %
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|------|----------------|-------------|-------------|----------|--------
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| 0078 |[Subsets](src/main/dart/g0001_0100/s0078_subsets)| 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) | 296 | 96.88
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| 0076 |[Minimum Window Substring](src/main/dart/g0001_0100/s0076_minimum_window_substring)| 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) | 337 | 92.86
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| 0075 |[Sort Colors](src/main/dart/g0001_0100/s0075_sort_colors)| 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) | 314 | 79.31
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| 0074 |[Search a 2D Matrix](src/main/dart/g0001_0100/s0074_search_a_2d_matrix)| 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) | 321 | 90.28
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| 0073 |[Set Matrix Zeroes](src/main/dart/g0001_0100/s0073_set_matrix_zeroes)| 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) | 350 | 91.30
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| 0072 |[Edit Distance](src/main/dart/g0001_0100/s0072_edit_distance)| Medium | 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) | 333 | 100.00
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| 0070 |[Climbing Stairs](src/main/dart/g0001_0100/s0070_climbing_stairs)| 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) | 301 | 81.01
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| 0064 |[Minimum Path Sum](src/main/dart/g0001_0100/s0064_minimum_path_sum)| 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) | 328 | 88.89
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| 0062 |[Unique Paths](src/main/dart/g0001_0100/s0062_unique_paths)| 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) | 287 | 91.67
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| 0056 |[Merge Intervals](src/main/dart/g0001_0100/s0056_merge_intervals)| 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) | 376 | 100.00
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| 0055 |[Jump Game](src/main/dart/g0001_0100/s0055_jump_game)| 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) | 331 | 97.53
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| 0053 |[Maximum Subarray](src/main/dart/g0001_0100/s0053_maximum_subarray)| Medium | Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Data_Structure_I_Day_1_Array, Dynamic_Programming_I_Day_5, Udemy_Famous_Algorithm, Big_O_Time_O(n)_Space_O(1) | 361 | 88.89
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| 0051 |[N-Queens](src/main/dart/g0001_0100/s0051_n_queens)| Hard | Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(N!)_Space_O(N) | 328 | 86.67

‎src/main/dart/g0001_0100/s0056_merge_intervals/readme.md‎

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[![](https://img.shields.io/github/stars/LeetCode-in-Dart/LeetCode-in-Dart?label=Stars&style=flat-square)](https://github.com/LeetCode-in-Dart/LeetCode-in-Dart)
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[![](https://img.shields.io/github/forks/LeetCode-in-Dart/LeetCode-in-Dart?label=Fork%20me%20on%20GitHub%20&style=flat-square)](https://github.com/LeetCode-in-Dart/LeetCode-in-Dart/fork)
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## 56\. Merge Intervals
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Medium
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Given an array of `intervals` where <code>intervals[i] = [start<sub>i</sub>, end<sub>i</sub>]</code>, merge all overlapping intervals, and return _an array of the non-overlapping intervals that cover all the intervals in the input_.
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**Example 1:**
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**Input:** intervals = \[\[1,3],[2,6],[8,10],[15,18]]
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**Output:** [[1,6],[8,10],[15,18]]
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**Explanation:** Since intervals [1,3] and [2,6] overlap, merge them into [1,6].
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**Example 2:**
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**Input:** intervals = \[\[1,4],[4,5]]
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**Output:** [[1,5]]
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**Explanation:** Intervals [1,4] and [4,5] are considered overlapping.
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**Constraints:**
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* <code>1 <= intervals.length <= 10<sup>4</sup></code>
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* `intervals[i].length == 2`
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* <code>0 <= start<sub>i</sub> <= end<sub>i</sub> <= 10<sup>4</sup></code>
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## Solution
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```dart
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class Solution {
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List<List<int>> merge(List<List<int>> intervals) {
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// Sort the intervals based on the start time
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intervals.sort((a, b) =>a[0].compareTo(b[0]));
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List<List<int>> merged = [];
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List<int> current = intervals[0];
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merged.add(current);
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for (List<int> next in intervals){
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if (current[1] >= next[0]) {
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// If the intervals overlap, merge them
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current[1] = current[1] > next[1] ? current[1] : next[1];
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} else {
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// Otherwise, move to the next interval
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current = next;
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merged.add(current);
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}
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}
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return merged;
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}
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}
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```

‎src/main/dart/g0001_0100/s0062_unique_paths/readme.md‎

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[![](https://img.shields.io/github/stars/LeetCode-in-Dart/LeetCode-in-Dart?label=Stars&style=flat-square)](https://github.com/LeetCode-in-Dart/LeetCode-in-Dart)
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[![](https://img.shields.io/github/forks/LeetCode-in-Dart/LeetCode-in-Dart?label=Fork%20me%20on%20GitHub%20&style=flat-square)](https://github.com/LeetCode-in-Dart/LeetCode-in-Dart/fork)
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## 62\. Unique Paths
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Medium
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There is a robot on an `m x n` grid. The robot is initially located at the **top-left corner** (i.e., `grid[0][0]`). The robot tries to move to the **bottom-right corner** (i.e., `grid[m - 1][n - 1]`). The robot can only move either down or right at any point in time.
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Given the two integers `m` and `n`, return _the number of possible unique paths that the robot can take to reach the bottom-right corner_.
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The test cases are generated so that the answer will be less than or equal to <code>2 * 10<sup>9</sup></code>.
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**Example 1:**
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![](https://assets.leetcode.com/uploads/2018/10/22/robot_maze.png)
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**Input:** m = 3, n = 7
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**Output:** 28
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**Example 2:**
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**Input:** m = 3, n = 2
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**Output:** 3
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**Explanation:** From the top-left corner, there are a total of 3 ways to reach the bottom-right corner:
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1. Right -> Down -> Down
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2. Down -> Down -> Right
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3. Down -> Right -> Down
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**Constraints:**
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* `1 <= m, n <= 100`
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## Solution
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```dart
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class Solution {
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int uniquePaths(int m, int n) {
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List<List<int>> dp = List.generate(m, (_) => List.filled(n, 0));
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// Initialize the first column to 1
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for (int i = 0; i < m; i++) {
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dp[i][0] = 1;
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}
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// Initialize the first row to 1
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for (int j = 0; j < n; j++) {
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dp[0][j] = 1;
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}
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// Fill the dp table
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for (int i = 1; i < m; i++) {
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for (int j = 1; j < n; j++) {
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dp[i][j] = dp[i - 1][j] + dp[i][j - 1];
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}
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}
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return dp[m - 1][n - 1];
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}
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}
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```

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

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[![](https://img.shields.io/github/stars/LeetCode-in-Dart/LeetCode-in-Dart?label=Stars&style=flat-square)](https://github.com/LeetCode-in-Dart/LeetCode-in-Dart)
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[![](https://img.shields.io/github/forks/LeetCode-in-Dart/LeetCode-in-Dart?label=Fork%20me%20on%20GitHub%20&style=flat-square)](https://github.com/LeetCode-in-Dart/LeetCode-in-Dart/fork)
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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`
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## Solution
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```dart
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class Solution {
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int minPathSum(List<List<int>> grid) {
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int m = grid.length;
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int n = grid[0].length;
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List<int> pathSum = List.filled(n, 100000);
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pathSum[0] = 0;
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for (int y = 0; y < m; y++) {
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for (int x = 0; x < n; x++) {
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pathSum[x] =
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(x > 0 ? min(pathSum[x], pathSum[x - 1]) : pathSum[x]) + grid[y][x];
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}
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}
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return pathSum[n - 1];
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}
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}
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int min(int a, int b) {
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if (a < b) {
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return a;
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}
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return b;
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}
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```

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