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‎README.md‎

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[![](https://img.shields.io/github/forks/javadev/LeetCode-in-Kotlin?label=Fork%20me%20on%20GitHub%20&style=flat-square)](https://github.com/javadev/LeetCode-in-Kotlin/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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9-
* [Programming Skills I](#programming-skills-i)
109
* [Programming Skills II](#programming-skills-ii)
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* [Graph Theory I](#graph-theory-i)
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* [SQL I](#sql-i)
@@ -21,102 +20,7 @@
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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)
24-
25-
### Programming Skills I
26-
27-
#### Day 1 Basic Data Type
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29-
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
30-
|-|-|-|-|-|-
31-
| 1523 |[Count Odd Numbers in an Interval Range](src/main/kotlin/g1501_1600/s1523_count_odd_numbers_in_an_interval_range)| Easy | Math | 114 | 97.22
32-
| 1491 |[Average Salary Excluding the Minimum and Maximum Salary](src/main/kotlin/g1401_1500/s1491_average_salary_excluding_the_minimum_and_maximum_salary)| Easy | Array, Sorting | 137 | 91.67
33-
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#### Day 2 Operator
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
38-
| 0191 |[Number of 1 Bits](src/main/kotlin/g0101_0200/s0191_number_of_1_bits)| Easy | Top_Interview_Questions, Bit_Manipulation | 237 | 68.44
39-
| 1281 |[Subtract the Product and Sum of Digits of an Integer](src/main/kotlin/g1201_1300/s1281_subtract_the_product_and_sum_of_digits_of_an_integer)| Easy | Math | 128 | 61.82
40-
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#### Day 3 Conditional Statements
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 0976 |[Largest Perimeter Triangle](src/main/kotlin/g0901_1000/s0976_largest_perimeter_triangle)| Easy | Array, Math, Sorting, Greedy | 304 | 33.33
46-
| 1779 |[Find Nearest Point That Has the Same X or Y Coordinate](src/main/kotlin/g1701_1800/s1779_find_nearest_point_that_has_the_same_x_or_y_coordinate)| Easy | Array | 364 | 100.00
47-
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#### Day 4 Loop
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
52-
| 1822 |[Sign of the Product of an Array](src/main/kotlin/g1801_1900/s1822_sign_of_the_product_of_an_array)| Easy | Array, Math | 170 | 92.51
53-
| 1502 |[Can Make Arithmetic Progression From Sequence](src/main/kotlin/g1501_1600/s1502_can_make_arithmetic_progression_from_sequence)| Easy | Array, Sorting | 156 | 94.82
54-
| 0202 |[Happy Number](src/main/kotlin/g0201_0300/s0202_happy_number)| Easy | Top_Interview_Questions, Hash_Table, Math, Two_Pointers | 261 | 45.08
55-
| 1790 |[Check if One String Swap Can Make Strings Equal](src/main/kotlin/g1701_1800/s1790_check_if_one_string_swap_can_make_strings_equal)| Easy | String, Hash_Table, Counting | 138 | 100.00
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#### Day 5 Function
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
61-
| 0589 |[N-ary Tree Preorder Traversal](src/main/kotlin/g0501_0600/s0589_n_ary_tree_preorder_traversal)| Easy | Depth_First_Search, Tree, Stack | 233 | 84.02
62-
| 0496 |[Next Greater Element I](src/main/kotlin/g0401_0500/s0496_next_greater_element_i)| Easy | Array, Hash_Table, Stack, Monotonic_Stack | 171 | 100.00
63-
| 1232 |[Check If It Is a Straight Line](src/main/kotlin/g1201_1300/s1232_check_if_it_is_a_straight_line)| Easy | Array, Math, Geometry | 152 | 95.38
64-
65-
#### Day 6 Array
66-
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
68-
|-|-|-|-|-|-
69-
| 1588 |[Sum of All Odd Length Subarrays](src/main/kotlin/g1501_1600/s1588_sum_of_all_odd_length_subarrays)| Easy | Array, Math, Prefix_Sum | 157 | 64.00
70-
| 0283 |[Move Zeroes](src/main/kotlin/g0201_0300/s0283_move_zeroes)| Easy | Top_100_Liked_Questions, Array, Two_Pointers, LeetCode_75_Two_Pointers, Big_O_Time_O(n)_Space_O(1) | 516 | 79.07
71-
| 1672 |[Richest Customer Wealth](src/main/kotlin/g1601_1700/s1672_richest_customer_wealth)| Easy | Array, Matrix | 155 | 94.54
72-
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#### Day 7 Array
74-
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
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|-|-|-|-|-|-
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| 1572 |[Matrix Diagonal Sum](src/main/kotlin/g1501_1600/s1572_matrix_diagonal_sum)| Easy | Array, Matrix | 221 | 67.61
78-
| 0566 |[Reshape the Matrix](src/main/kotlin/g0501_0600/s0566_reshape_the_matrix)| Easy | Array, Matrix, Simulation | 239 | 99.05
79-
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#### Day 8 String
81-
82-
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
83-
|-|-|-|-|-|-
84-
| 1768 |[Merge Strings Alternately](src/main/kotlin/g1701_1800/s1768_merge_strings_alternately)| Easy | String, Two_Pointers, LeetCode_75_Array/String | 138 | 93.81
85-
| 1678 |[Goal Parser Interpretation](src/main/kotlin/g1601_1700/s1678_goal_parser_interpretation)| Easy | String | 136 | 88.24
86-
| 0389 |[Find the Difference](src/main/kotlin/g0301_0400/s0389_find_the_difference)| Easy | String, Hash_Table, Sorting, Bit_Manipulation | 256 | 64.81
87-
88-
#### Day 9 String
89-
90-
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
91-
|-|-|-|-|-|-
92-
| 0709 |[To Lower Case](src/main/kotlin/g0701_0800/s0709_to_lower_case)| Easy | String | 142 | 98.68
93-
| 1309 |[Decrypt String from Alphabet to Integer Mapping](src/main/kotlin/g1301_1400/s1309_decrypt_string_from_alphabet_to_integer_mapping)| Easy | String | 0 | 100.00
94-
| 0953 |[Verifying an Alien Dictionary](src/main/kotlin/g0901_1000/s0953_verifying_an_alien_dictionary)| Easy | Array, String, Hash_Table | 137 | 100.00
95-
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#### Day 10 Linked List and Tree
97-
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| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
99-
|-|-|-|-|-|-
100-
| 1290 |[Convert Binary Number in a Linked List to Integer](src/main/kotlin/g1201_1300/s1290_convert_binary_number_in_a_linked_list_to_integer)| Easy | Math, Linked_List | 138 | 65.79
101-
| 0876 |[Middle of the Linked List](src/main/kotlin/g0801_0900/s0876_middle_of_the_linked_list)| Easy | Two_Pointers, Linked_List | 136 | 76.52
102-
| 0104 |[Maximum Depth of Binary Tree](src/main/kotlin/g0101_0200/s0104_maximum_depth_of_binary_tree)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, LeetCode_75_Binary_Tree/DFS, Big_O_Time_O(N)_Space_O(H) | 166 | 83.53
103-
| 0404 |[Sum of Left Leaves](src/main/kotlin/g0401_0500/s0404_sum_of_left_leaves)| Easy | Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree | 173 | 86.05
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#### Day 11 Containers and Libraries
106-
107-
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
108-
|-|-|-|-|-|-
109-
| 1356 |[Sort Integers by The Number of 1 Bits](src/main/kotlin/g1301_1400/s1356_sort_integers_by_the_number_of_1_bits)| Easy | Array, Sorting, Bit_Manipulation, Counting | 236 | 92.31
110-
| 0232 |[Implement Queue using Stacks](src/main/kotlin/g0201_0300/s0232_implement_queue_using_stacks)| Easy | Stack, Design, Queue | 258 | 70.86
111-
| 0242 |[Valid Anagram](src/main/kotlin/g0201_0300/s0242_valid_anagram)| Easy | String, Hash_Table, Sorting | 251 | 87.65
112-
| 0217 |[Contains Duplicate](src/main/kotlin/g0201_0300/s0217_contains_duplicate)| Easy | Top_Interview_Questions, Array, Hash_Table, Sorting | 719 | 73.49
113-
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#### Day 12 Class and Object
115-
116-
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
117-
|-|-|-|-|-|-
118-
| 1603 |[Design Parking System](src/main/kotlin/g1601_1700/s1603_design_parking_system)| Easy | Design, Simulation, Counting | 376 | 31.83
119-
| 0303 |[Range Sum Query - Immutable](src/main/kotlin/g0301_0400/s0303_range_sum_query_immutable)| Easy | Array, Design, Prefix_Sum | 472 | 63.64
23+
* [Programming Skills I](#programming-skills-i)
12024

12125
### Programming Skills II
12226

@@ -2084,6 +1988,102 @@
20841988
| 0343 |[Integer Break](src/main/kotlin/g0301_0400/s0343_integer_break)| Medium | Dynamic_Programming, Math | 218 | 63.89
20851989
| 0279 |[Perfect Squares](src/main/kotlin/g0201_0300/s0279_perfect_squares)| Medium | Top_100_Liked_Questions, Dynamic_Programming, Math, Breadth_First_Search | 176 | 98.80
20861990

1991+
### Programming Skills I
1992+
1993+
#### Day 1 Basic Data Type
1994+
1995+
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
1996+
|-|-|-|-|-|-
1997+
| 1523 |[Count Odd Numbers in an Interval Range](src/main/kotlin/g1501_1600/s1523_count_odd_numbers_in_an_interval_range)| Easy | Math | 114 | 97.22
1998+
| 1491 |[Average Salary Excluding the Minimum and Maximum Salary](src/main/kotlin/g1401_1500/s1491_average_salary_excluding_the_minimum_and_maximum_salary)| Easy | Array, Sorting | 137 | 91.67
1999+
2000+
#### Day 2 Operator
2001+
2002+
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
2003+
|-|-|-|-|-|-
2004+
| 0191 |[Number of 1 Bits](src/main/kotlin/g0101_0200/s0191_number_of_1_bits)| Easy | Top_Interview_Questions, Bit_Manipulation | 237 | 68.44
2005+
| 1281 |[Subtract the Product and Sum of Digits of an Integer](src/main/kotlin/g1201_1300/s1281_subtract_the_product_and_sum_of_digits_of_an_integer)| Easy | Math | 128 | 61.82
2006+
2007+
#### Day 3 Conditional Statements
2008+
2009+
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
2010+
|-|-|-|-|-|-
2011+
| 0976 |[Largest Perimeter Triangle](src/main/kotlin/g0901_1000/s0976_largest_perimeter_triangle)| Easy | Array, Math, Sorting, Greedy | 304 | 33.33
2012+
| 1779 |[Find Nearest Point That Has the Same X or Y Coordinate](src/main/kotlin/g1701_1800/s1779_find_nearest_point_that_has_the_same_x_or_y_coordinate)| Easy | Array | 364 | 100.00
2013+
2014+
#### Day 4 Loop
2015+
2016+
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
2017+
|-|-|-|-|-|-
2018+
| 1822 |[Sign of the Product of an Array](src/main/kotlin/g1801_1900/s1822_sign_of_the_product_of_an_array)| Easy | Array, Math | 170 | 92.51
2019+
| 1502 |[Can Make Arithmetic Progression From Sequence](src/main/kotlin/g1501_1600/s1502_can_make_arithmetic_progression_from_sequence)| Easy | Array, Sorting | 156 | 94.82
2020+
| 0202 |[Happy Number](src/main/kotlin/g0201_0300/s0202_happy_number)| Easy | Top_Interview_Questions, Hash_Table, Math, Two_Pointers | 261 | 45.08
2021+
| 1790 |[Check if One String Swap Can Make Strings Equal](src/main/kotlin/g1701_1800/s1790_check_if_one_string_swap_can_make_strings_equal)| Easy | String, Hash_Table, Counting | 138 | 100.00
2022+
2023+
#### Day 5 Function
2024+
2025+
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
2026+
|-|-|-|-|-|-
2027+
| 0589 |[N-ary Tree Preorder Traversal](src/main/kotlin/g0501_0600/s0589_n_ary_tree_preorder_traversal)| Easy | Depth_First_Search, Tree, Stack | 233 | 84.02
2028+
| 0496 |[Next Greater Element I](src/main/kotlin/g0401_0500/s0496_next_greater_element_i)| Easy | Array, Hash_Table, Stack, Monotonic_Stack | 171 | 100.00
2029+
| 1232 |[Check If It Is a Straight Line](src/main/kotlin/g1201_1300/s1232_check_if_it_is_a_straight_line)| Easy | Array, Math, Geometry | 152 | 95.38
2030+
2031+
#### Day 6 Array
2032+
2033+
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
2034+
|-|-|-|-|-|-
2035+
| 1588 |[Sum of All Odd Length Subarrays](src/main/kotlin/g1501_1600/s1588_sum_of_all_odd_length_subarrays)| Easy | Array, Math, Prefix_Sum | 157 | 64.00
2036+
| 0283 |[Move Zeroes](src/main/kotlin/g0201_0300/s0283_move_zeroes)| Easy | Top_100_Liked_Questions, Array, Two_Pointers, LeetCode_75_Two_Pointers, Big_O_Time_O(n)_Space_O(1) | 516 | 79.07
2037+
| 1672 |[Richest Customer Wealth](src/main/kotlin/g1601_1700/s1672_richest_customer_wealth)| Easy | Array, Matrix | 155 | 94.54
2038+
2039+
#### Day 7 Array
2040+
2041+
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
2042+
|-|-|-|-|-|-
2043+
| 1572 |[Matrix Diagonal Sum](src/main/kotlin/g1501_1600/s1572_matrix_diagonal_sum)| Easy | Array, Matrix | 221 | 67.61
2044+
| 0566 |[Reshape the Matrix](src/main/kotlin/g0501_0600/s0566_reshape_the_matrix)| Easy | Array, Matrix, Simulation | 239 | 99.05
2045+
2046+
#### Day 8 String
2047+
2048+
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
2049+
|-|-|-|-|-|-
2050+
| 1768 |[Merge Strings Alternately](src/main/kotlin/g1701_1800/s1768_merge_strings_alternately)| Easy | String, Two_Pointers, LeetCode_75_Array/String | 138 | 93.81
2051+
| 1678 |[Goal Parser Interpretation](src/main/kotlin/g1601_1700/s1678_goal_parser_interpretation)| Easy | String | 136 | 88.24
2052+
| 0389 |[Find the Difference](src/main/kotlin/g0301_0400/s0389_find_the_difference)| Easy | String, Hash_Table, Sorting, Bit_Manipulation | 256 | 64.81
2053+
2054+
#### Day 9 String
2055+
2056+
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
2057+
|-|-|-|-|-|-
2058+
| 0709 |[To Lower Case](src/main/kotlin/g0701_0800/s0709_to_lower_case)| Easy | String | 142 | 98.68
2059+
| 1309 |[Decrypt String from Alphabet to Integer Mapping](src/main/kotlin/g1301_1400/s1309_decrypt_string_from_alphabet_to_integer_mapping)| Easy | String | 0 | 100.00
2060+
| 0953 |[Verifying an Alien Dictionary](src/main/kotlin/g0901_1000/s0953_verifying_an_alien_dictionary)| Easy | Array, String, Hash_Table | 137 | 100.00
2061+
2062+
#### Day 10 Linked List and Tree
2063+
2064+
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
2065+
|-|-|-|-|-|-
2066+
| 1290 |[Convert Binary Number in a Linked List to Integer](src/main/kotlin/g1201_1300/s1290_convert_binary_number_in_a_linked_list_to_integer)| Easy | Math, Linked_List | 138 | 65.79
2067+
| 0876 |[Middle of the Linked List](src/main/kotlin/g0801_0900/s0876_middle_of_the_linked_list)| Easy | Two_Pointers, Linked_List | 136 | 76.52
2068+
| 0104 |[Maximum Depth of Binary Tree](src/main/kotlin/g0101_0200/s0104_maximum_depth_of_binary_tree)| Easy | Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, LeetCode_75_Binary_Tree/DFS, Big_O_Time_O(N)_Space_O(H) | 166 | 83.53
2069+
| 0404 |[Sum of Left Leaves](src/main/kotlin/g0401_0500/s0404_sum_of_left_leaves)| Easy | Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree | 173 | 86.05
2070+
2071+
#### Day 11 Containers and Libraries
2072+
2073+
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
2074+
|-|-|-|-|-|-
2075+
| 1356 |[Sort Integers by The Number of 1 Bits](src/main/kotlin/g1301_1400/s1356_sort_integers_by_the_number_of_1_bits)| Easy | Array, Sorting, Bit_Manipulation, Counting | 236 | 92.31
2076+
| 0232 |[Implement Queue using Stacks](src/main/kotlin/g0201_0300/s0232_implement_queue_using_stacks)| Easy | Stack, Design, Queue | 258 | 70.86
2077+
| 0242 |[Valid Anagram](src/main/kotlin/g0201_0300/s0242_valid_anagram)| Easy | String, Hash_Table, Sorting | 251 | 87.65
2078+
| 0217 |[Contains Duplicate](src/main/kotlin/g0201_0300/s0217_contains_duplicate)| Easy | Top_Interview_Questions, Array, Hash_Table, Sorting | 719 | 73.49
2079+
2080+
#### Day 12 Class and Object
2081+
2082+
| <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- --> | <!-- -->
2083+
|-|-|-|-|-|-
2084+
| 1603 |[Design Parking System](src/main/kotlin/g1601_1700/s1603_design_parking_system)| Easy | Design, Simulation, Counting | 376 | 31.83
2085+
| 0303 |[Range Sum Query - Immutable](src/main/kotlin/g0301_0400/s0303_range_sum_query_immutable)| Easy | Array, Design, Prefix_Sum | 472 | 63.64
2086+
20872087
## Algorithms
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| # | Title | Difficulty | Tag | Time, ms | Time, %

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