| 001 |
001.Two_Sum |
Python Java C++ |
Notes |
| 002 |
002.Add_Two_Numbers |
Python Java C++ |
Notes |
| 003 |
003.Longest_Substring_Without_Repeat... |
Python Java C++ |
Notes |
| 004 |
004.Median_of_Two_Sorted_Arrays |
Python Java C++ |
Notes |
| 005 |
005.Longest_Palindromic_Substring |
Python Java C++ |
Notes |
| 006 |
006.ZigZag_Conversion |
Python Java C++ |
Notes |
| 007 |
007.Reverse_Integer |
Python Java C++ |
Notes |
| 008 |
008.String_to_Integer |
Python Java C++ |
Notes |
| 009 |
009.Palindrome_Number |
Python Java C++ |
Notes |
| 010 |
010.Regular_Expression_Matching |
Python Java C++ |
Notes |
| 011 |
011.Container_With_Most_Water |
Python Java C++ |
Notes |
| 012 |
012.Integer_to_Roman |
Python Java C++ |
Notes |
| 013 |
013.Roman_to_Integer |
Python Java C++ |
Notes |
| 014 |
014.Longest_Common_Prefix |
Python Java C++ |
Notes |
| 015 |
015.3Sum |
Python Java C++ |
Notes |
| 016 |
016.3Sum_Closest |
Python Java C++ |
Notes |
| 017 |
017.Letter_Combinations_of_a_Phone_Number |
Python Java C++ |
Notes |
| 018 |
018.4Sum |
Python Java C++ |
Notes |
| 019 |
019.Remove_Nth_Node_From_End_of_List |
Python C++ |
Notes |
| 020 |
020.Valid_Parentheses |
Python Java C++ |
Notes |
| 021 |
021.Merge_Two_Sorted_Lists |
Python C++ |
Notes |
| 022 |
022.Generate_Parentheses |
Python Java C++ |
Notes |
| 023 |
023.Merge_k_Sorted_Lists |
Python Java C++ |
Notes |
| 024 |
024.Swap_Nodes_in_Pairs |
Python C++ |
Notes |
| 025 |
025.Reverse_Nodes_in_k-Group |
Java C++ |
Notes |
| 026 |
026.Remove_Duplicates_from_Sorted_Array |
C++ |
Notes |
| 027 |
027.Remove_Element |
C++ |
Notes |
| 028 |
028.Implement_strStr() |
Python C++ |
Notes |
| 029 |
029.Divide_Two_Integers |
Python C++ |
Notes |
| 030 |
030.Substring_with_Concatenation_of_... |
Java C++ |
Notes |
| 031 |
031.Next_Permutation |
Python C++ |
Notes |
| 032 |
032.Longest_Valid_Parentheses |
C++ |
Notes |
| 033 |
033.Search_in_Rotated_Sorted_Array |
C++ |
Notes |
| 034 |
034.Search_for_a_Range |
Java C++ |
Notes |
| 035 |
035.Search_Insert_Position |
C++ |
Notes |
| 036 |
036.Valid_Sudoku |
C++ |
Notes |
| 037 |
037.Sudoku_Solver |
C++ |
Notes |
| 038 |
038.Count_and_Say |
Python C++ |
Notes |
| 039 |
039.Combination_Sum |
C++ |
Notes |
| 040 |
040.Combination_Sum_II |
C++ |
Notes |
| 041 |
041.First_Missing_Positive |
C++ |
Coming soon |
| 042 |
042.Trapping_Rain_Water |
C++ |
Coming soon |
| 043 |
043.Multiply_Strings |
C++ |
Coming soon |
| 044 |
044.Wildcard_Matching |
C++ |
Coming soon |
| 045 |
045.Jump_Game_II |
C++ |
Coming soon |
| 046 |
046.Permutations |
C++ |
Coming soon |
| 047 |
047.Permutations_II |
C++ |
Coming soon |
| 048 |
048.Rotate_Image |
C++ |
Coming soon |
| 049 |
049.Anagrams |
C++ |
Coming soon |
| 050 |
050.Pow(x,_n) |
C++ |
Coming soon |
| 051 |
051.N-Queens |
Python Java C++ |
Coming soon |
| 052 |
052.N-Queens_II |
Python Java C++ |
Coming soon |
| 053 |
053.Maximum_Subarray |
C++ |
Coming soon |
| 054 |
054.Spiral_Matrix |
C++ |
Coming soon |
| 055 |
055.Jump_Game |
C++ |
Coming soon |
| 056 |
056.Merge_Intervals |
C++ |
Coming soon |
| 057 |
057.Insert_Interval |
C++ |
Coming soon |
| 058 |
058.Length_of_Last_Word |
C++ |
Coming soon |
| 059 |
059.Spiral_Matrix_II |
C++ |
Coming soon |
| 060 |
060.Permutation_Sequence |
C++ |
Coming soon |
| 061 |
061.Rotate_List |
C++ |
Coming soon |
| 062 |
062.Unique_Paths |
C++ |
Coming soon |
| 063 |
063.Unique_Paths_II |
C++ |
Coming soon |
| 064 |
064.Minimum_Path_Sum |
C++ |
Coming soon |
| 065 |
065.Valid_Number |
Python Java C++ |
Coming soon |
| 066 |
066.Plus_One |
C++ |
Coming soon |
| 067 |
067.Add_Binary |
C++ |
Coming soon |
| 068 |
068.Text_Justification |
Python Java C++ |
Notes |
| 069 |
069.Sqrt(x) |
Python Java C++ |
Coming soon |
| 070 |
070.Climbing_Stairs |
C++ |
Coming soon |
| 071 |
071.Simplify_Path |
Python Java C++ |
Coming soon |
| 072 |
072.Edit_Distance |
C++ |
Coming soon |
| 073 |
073.Set_Matrix_Zeroes |
C++ |
Coming soon |
| 074 |
074.Search_a_2D_Matrix |
C++ |
Coming soon |
| 075 |
075.Sort_Colors |
C++ |
Coming soon |
| 076 |
076.Minimum_Window_Substring |
C++ |
Notes |
| 077 |
077.Combinations |
C++ |
Coming soon |
| 078 |
078.Subsets |
Python Java C++ |
Coming soon |
| 079 |
079.Word_Search |
C++ |
Coming soon |
| 080 |
080.Remove_Duplicates_from_Sorted_Array_II |
C++ |
Coming soon |
| 081 |
081.Search_in_Rotated_Sorted_Array_II |
C++ |
Coming soon |
| 082 |
082.Remove_Duplicates_from_Sorted_List_II |
C++ |
Coming soon |
| 083 |
083.Remove_Duplicates_from_Sorted_List |
C++ |
Coming soon |
| 084 |
084.Largest_Rectangle_in_Histogram |
Java C++ |
Notes |
| 085 |
085.Maximal_Rectangle |
Java C++ |
Notes |
| 086 |
086.Partition_List |
Python Java C++ |
Coming soon |
| 087 |
087.Scramble_String |
Python Java C++ |
Notes |
| 088 |
088.Merge_Sorted_Array |
C++ |
Coming soon |
| 089 |
089.Gray_Code |
Python Java C++ |
Coming soon |
| 090 |
090.Subsets_II |
Python Java C++ |
Coming soon |
| 091 |
091.Decode_Ways |
Python Java C++ |
Coming soon |
| 092 |
092.Reverse_Linked_List_II |
C++ |
Coming soon |
| 093 |
093.Restore_IP_Addresses |
Python Java C++ |
Notes |
| 094 |
094.Binary_Tree_Inorder_Traversal |
C++ |
Coming soon |
| 095 |
095.Unique_Binary_Search_Trees |
C++ |
Notes |
| 096 |
096.Unique_Binary_Search_Trees_II |
C++ |
Notes |
| 097 |
097.Interleaving_String |
Java C++ |
Notes |
| 098 |
098.Validate_Binary_Search_Tree |
Python Java C++ |
Notes |
| 099 |
099.Recover_Binary_Search_Tree |
Python C++ |
Notes |
| 100 |
100.Same_Tree |
C++ |
Coming soon |
| 101 |
101.Symmetric_Tree |
C++ |
Coming soon |
| 102 |
102.Binary_Tree_Level_Order_Traversal |
Python C++ |
Notes |
| 103 |
103.Binary_Tree_Zigzag_Level_Order_Traversal |
Python C++ |
Notes |
| 104 |
104.Maximum_Depth_of_Binary_Tree |
C++ |
Coming soon |
| 105 |
105.Construct_Binary_Tree_from_Preor... |
C++ |
Notes |
| 106 |
106.Construct_Binary_Tree_from_Inord... |
C++ |
Notes |
| 107 |
107.Binary_Tree_Level_Order_Traversal_II |
Python C++ |
Notes |
| 108 |
108.Convert_Sorted_Array_to_Binary_S... |
C++ |
Notes |
| 109 |
109.Convert_Sorted_List_to_Binary_Se... |
Python C++ |
Notes |
| 110 |
110.Balanced_Binary_Tree |
C++ |
Coming soon |
| 111 |
111.Minimum_Depth_of_Binary_Tree |
C++ |
Coming soon |
| 112 |
112.Path_Sum |
C++ |
Coming soon |
| 113 |
113.Path_Sum_II |
Python Java C++ |
Coming soon |
| 114 |
114.Flatten_Binary_Tree_to_Linked_List |
Java C++ |
Notes |
| 115 |
115.Distinct_Subsequences |
Python C++ |
Notes |
| 116 |
116.Populating_Next_Right_Pointers_i... |
Python Java C++ |
Coming soon |
| 117 |
117.Populating_Next_Right_Pointers_i... |
Python Java C++ |
Coming soon |
| 118 |
118.Pascals_Triangle |
C++ |
Coming soon |
| 119 |
119.Pascal's_Triangle_II |
C++ |
Coming soon |
| 120 |
120.Triangle |
Python Java C++ |
Coming soon |
| 121 |
121.Best_Time_to_Buy_and_Sell_Stock |
Python C++ |
Notes |
| 122 |
122.Best_Time_to_Buy_and_Sell_Stock_II |
Python C++ |
Notes |
| 123 |
123.Best_Time_to_Buy_and_Sell_Stock_III |
Python C++ |
Notes |
| 124 |
124.Binary_Tree_Maximum_Path_Sum |
Python C++ |
Notes |
| 125 |
125.Valid_Palindrome |
C++ |
Coming soon |
| 126 |
126.Word_Ladder |
Python C++ |
Notes |
| 127 |
127.Word_Ladder_II |
|
Coming soon |
| 128 |
128.Longest_Consecutive_Sequence |
|
Coming soon |
| 129 |
129.Sum_Root_to_Leaf_Numbers |
C++ |
Coming soon |
| 130 |
130.Surrounded_Regions |
C++ |
Notes |
| 131 |
131.Palindrome_Partitioning |
Python C++ |
Notes |
| 132 |
132.Palindrome_Partitioning_II |
Java C++ |
Notes |
| 133 |
133.Clone_Graph |
C++ |
Coming soon |
| 134 |
134.Gas_Station |
C++ |
Notes |
| 135 |
135.Candy |
|
Coming soon |
| 136 |
136.Single_Number |
C++ |
Notes |
| 137 |
137.Single_Number_II |
C++ |
Coming soon |
| 138 |
138.Copy_List_with_Random_Pointer |
Python Java C++ |
Notes |
| 139 |
139.Word_Break |
Python C++ |
Notes |
| 140 |
140.Word_Break_II |
|
Coming soon |
| 141 |
141.Linked_List_Cycle |
C++ |
Coming soon |
| 142 |
142.Linked_List_Cycle_II |
|
Coming soon |
| 143 |
143.Reorder_List |
C++ |
Coming soon |
| 144 |
144.Binary_Tree_Preorder_Traversal |
C++ |
Coming soon |
| 145 |
145.Binary_Tree_Postorder_Traversal |
C++ |
Coming soon |
| 146 |
146.LRU_Cache |
Python C++ |
Notes |
| 147 |
147.Insertion_Sort_List |
C++ |
Coming soon |
| 148 |
148.Sort_List |
C++ |
Notes |
| 149 |
149.Max_Points_on_a_Line |
|
Coming soon |
| 150 |
150.Evaluate_Reverse_Polish_Notation |
Python Java C++ |
Notes |
| 151 |
151.Reverse_Words_in_a_String |
Python Java C++ |
Notes |
| 152 |
152.Maximum_Product_Subarray |
C++ |
Coming soon |
| 153 |
153.Find_Minimum_in_Rotated_Sorted_Array |
C++ |
Notes |
| 154 |
154.Find_Minimum_in_Rotated_Sorted_Array_II |
Python C++ |
Notes |
| 155 |
155.Min_Stack |
C++ |
Notes |
| 156 |
156.Binary_Tree_Upside_Down $ |
Not Buy |
Not Buy |
| 157 |
157.Read_N_Characters_Given_Read4 $ |
Not Buy |
Not Buy |
| 158 |
158.Read_N_Characters_Given_Read4_II... $ |
Not Buy |
Not Buy |
| 159 |
159.Longest_Substring_with_At_Most_T... $ |
Not Buy |
Not Buy |
| 160 |
160.Intersection_of_Two_Linked_Lists |
C++ |
Coming soon |
| 161 |
161.One_Edit_Distance $ |
Not Buy |
Not Buy |
| 162 |
162.Find_Peak_Element |
Python Java C++ |
Coming soon |
| 163 |
163.Missing_Ranges $ |
Not Buy |
Not Buy |
| 164 |
164.Maximum_Gap |
C++ |
Notes |
| 165 |
165.Compare_Version_Numbers |
C++ |
Coming soon |
| 166 |
166.Fraction_to_Recurring_Decimal |
C++ |
Notes |
| 167 |
167.Two_Sum_II_-_Input_array_is_sorted $ |
Not Buy |
Not Buy |
| 168 |
168.Excel_Sheet_Column_Title |
Python Java C++ |
Coming soon |
| 169 |
169.Majority_Element |
Python Java C++ |
Coming soon |
| 170 |
170.Two_Sum_III_-_Data_structure_design $ |
Not Buy |
Not Buy |
| 171 |
171.Excel_Sheet_Column_Number |
Python Java C++ |
Coming soon |
| 172 |
172.Factorial_Trailing_Zeroes |
Python Java C++ |
Coming soon |
| 173 |
173.Binary_Search_Tree_Iterator |
Python C++ |
Notes |
| 174 |
174.Dungeon_Game |
|
Coming soon |
| 175 |
175.Combine_Two_Tables |
Sql |
Coming soon |
| 176 |
176.Second_Highest_Salary |
Sql |
Coming soon |
| 177 |
177.Nth_Highest_Salary |
Sql |
Notes |
| 178 |
178.Rank_Scores |
Sql |
Notes |
| 179 |
179.Largest_Number |
Python Java C++ |
Coming soon |
| 180 |
180.Consecutive_Numbers |
Sql |
Notes |
| 181 |
181.Employees_Earning_More_Than_Thei... |
Sql |
Coming soon |
| 182 |
182.Duplicate_Emails |
Sql |
Coming soon |
| 183 |
183.Customers_Who_Never_Order |
Sql |
Notes |
| 184 |
184.Department_Highest_Salary |
Sql |
Notes |
| 185 |
185.Department_Top_Three_Salaries |
|
Coming soon |
| 186 |
186.Reverse_Words_in_a_String_II $ |
Not Buy |
Not Buy |
| 187 |
187.Repeated_DNA_Sequences |
Python Java C++ |
Coming soon |
| 188 |
188.Best_Time_to_Buy_and_Sell_Stock_IV |
C++ |
Notes |
| 189 |
189.Rotate_Array |
C++ |
Notes |
| 190 |
190.Reverse_Bits |
Python Java C++ |
Notes |
| 191 |
191.Number_of_1_Bits |
Java C++ |
Notes |
| 192 |
192.Word_Frequency |
Shell |
Notes |
| 193 |
193.Valid_Phone_Numbers |
Shell |
Notes |
| 194 |
194.Transpose_File |
Shell |
Notes |
| 195 |
195.Tenth_Line |
Shell |
Notes |
| 196 |
196.Delete_Duplicate_Emails |
Sql |
Coming soon |
| 197 |
197.Rising_Temperature |
Sql |
Notes |
| 198 |
198.House_Robber |
C++ |
Notes |
| 199 |
199.Binary_Tree_Right_Side_View |
Python C++ |
Notes |
| 200 |
200.Number_of_Islands |
C++ |
Notes |
| 201 |
201.Bitwise_AND_of_Numbers_Range |
Python C++ |
Notes |
| 202 |
202.Happy_Number |
Python C++ |
Notes |
| 203 |
203.Remove_Linked_List_Elements |
Python Java C++ |
Notes |
| 204 |
204.Count_Primes |
C++ |
Coming soon |
| 205 |
205.Isomorphic_Strings |
Python C++ |
Notes |
| 206 |
206.Reverse_Linked_List |
C++ |
Coming soon |
| 207 |
207.Course_Schedule |
Python C++ |
Notes |
| 208 |
208.Implement_Trie_(Prefix_Tree) |
C++ |
Notes |
| 209 |
209.Minimum_Size_Subarray_Sum |
C++ |
Coming soon |
| 210 |
210.Course_Schedule_II |
|
Coming soon |
| 211 |
211.Add_and_Search_Word_-_Data_struc... |
|
Coming soon |
| 212 |
212.Word_Search_II |
|
Coming soon |
| 213 |
213.House_Robber_II |
|
Coming soon |
| 214 |
214.Shortest_Palindrome |
|
Coming soon |
| 215 |
215.Kth_Largest_Element_in_an_Array |
Python Java C++ |
Notes |
| 216 |
216.Combination_Sum_III |
C++ |
Notes |
| 217 |
217.Contains_Duplicate |
Python C++ |
Notes |
| 218 |
218.The_Skyline_Problem |
|
Coming soon |
| 219 |
219.Contains_Duplicate_II |
C++ |
Notes |
| 220 |
220.Contains_Duplicate_III |
Java C++ |
Notes |
| 221 |
221.Maximal_Square |
Python C++ |
Notes |
| 222 |
222.Count_Complete_Tree_Nodes |
Python C++ |
Notes |
| 223 |
223.Rectangle_Area |
C++ |
Notes |
| 224 |
224.Basic_Calculator |
Java C++ |
Notes |
| 225 |
225.Implement_Stack_using_Queues |
Java C++ |
Notes |
| 226 |
226.Invert_Binary_Tree |
Python C++ |
Notes |
| 227 |
227.Basic_Calculator_II |
|
Coming soon |
| 228 |
228.Summary_Ranges |
Python C++ |
Notes |
| 229 |
229.Majority_Element_II |
|
Coming soon |
| 230 |
230.Kth_Smallest_Element_in_a_BST |
C++ |
Notes |
| 231 |
231.Power_of_Two |
Python C++ |
Notes |
| 232 |
232.Implement_Queue_using_Stacks |
Python C++ |
Notes |
| 233 |
233.Number_of_Digit_One |
|
Coming soon |
| 234 |
234.Palindrome_Linked_List |
Python Java C++ |
Notes |
| 235 |
235.Lowest_Common_Ancestor_of_a_Bina... |
Python C++ |
Notes |
| 236 |
236.Lowest_Common_Ancestor_of_a_Binary_Tree |
|
Coming soon |
| 237 |
237.Delete_Node_in_a_Linked_List |
Python C++ |
Notes |
| 238 |
238.Product_of_Array_Except_Self |
|
Coming soon |
| 239 |
239.Sliding_Window_Maximum |
Python C++ |
Notes |
| 240 |
240.Search_a_2D_Matrix_II |
|
Coming soon |
| 241 |
241.Different_Ways_to_Add_Parentheses |
Python C++ |
Notes |
| 242 |
242.Valid_Anagram |
Python C++ |
Notes |
| 243 |
243.Shortest_Word_Distance $ |
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| 244 |
244.Shortest_Word_Distance_II $ |
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| 245 |
245.Shortest_Word_Distance_III $ |
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| 246 |
246.Strobogrammatic_Number $ |
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| 247 |
247.Strobogrammatic_Number_II $ |
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| 248 |
248.Strobogrammatic_Number_III $ |
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| 249 |
249.Group_Shifted_Strings $ |
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| 250 |
250.Count_Univalue_Subtrees $ |
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| 251 |
251.Flatten_2D_Vector $ |
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| 252 |
252.Meeting_Rooms $ |
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| 253 |
253.Meeting_Rooms_II $ |
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| 254 |
254.Factor_Combinations $ |
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| 255 |
255.Verify_Preorder_Sequence_in_Bina... $ |
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| 256 |
256.Paint_House $ |
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| 257 |
257.Binary_Tree_Paths |
Python C++ |
Notes |
| 258 |
258.Add_Digits |
Python C++ |
Notes |
| 259 |
259.3Sum_Smaller $ |
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| 260 |
260.Single_Number_III |
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Coming soon |
| 261 |
261.Graph_Valid_Tree $ |
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| 262 |
262_is_missing |
|
Coming soon |
| 263 |
263.Ugly_Number |
Python C++ |
Notes |
| 264 |
264.Ugly_Number_II |
|
Coming soon |
| 265 |
265.Paint_House_II $ |
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| 266 |
266.Palindrome_Permutation $ |
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| 267 |
267.Palindrome_Permutation_II $ |
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| 268 |
268.Missing_Number |
Python Java C++ |
Notes |
| 269 |
269.Alien_Dictionary $ |
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| 270 |
270.Closest_Binary_Search_Tree_Value $ |
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| 271 |
271.Encode_and_Decode_Strings $ |
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| 272 |
272.Closest_Binary_Search_Tree_Value_II $ |
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| 273 |
273.Integer_to_English_Words |
|
Coming soon |
| 274 |
274.H-Index |
|
Coming soon |
| 275 |
275.H-Index_II |
|
Coming soon |
| 276 |
276.Paint_Fence $ |
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| 277 |
277.Find_the_Celebrity $ |
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| 278 |
278.First_Bad_Version |
Python C++ |
Notes |
| 279 |
279.Perfect_Squares |
Python C++ |
Notes |
| 280 |
280.Wiggle_Sort $ |
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| 281 |
281.Zigzag_Iterator $ |
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| 282 |
282.Expression_Add_Operators |
|
Coming soon |
| 283 |
283.Move_Zeroes |
C++ |
Notes |
| 284 |
284.Peeking_Iterator |
|
Coming soon |
| 285 |
285.Inorder_Successor_in_BST $ |
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| 286 |
286.Walls_and_Gates $ |
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| 287 |
287.Find_the_Duplicate_Number |
|
Coming soon |
| 288 |
288.Unique_Word_Abbreviation $ |
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| 289 |
289.Game_of_Life |
Python C++ |
Notes |
| 290 |
290.Word_Pattern |
Python C++ |
Notes |
| 291 |
291.Word_Pattern_II $ |
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| 292 |
292.Nim_Game |
|
Coming soon |
| 293 |
293.Flip_Game $ |
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| 294 |
294.Flip_Game_II $ |
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| 295 |
295.Find_Median_from_Data_Stream |
|
Coming soon |
| 296 |
296.Best_Meeting_Point $ |
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| 297 |
297.Serialize_and_Deserialize_Binary_Tree |
|
Coming soon |
| 298 |
298.Binary_Tree_Longest_Consecutive_Sequence $ |
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| 299 |
299.Bulls_and_Cows |
C++ |
Coming soon |
| 300 |
300.Longest_Increasing_Subsequence |
|
Coming soon |