LeetCodePython

How to practice?

• Understand the data structure (Binary Tree)
• Understand the algorithms of this structure (DFS)
• Repeat the exercises in LeetCode (About the chosen algorithm)
• Identify patterns

Repeat this for each topic

How to start? (Plan)

1. We can start with the "Top100 Liked Questions"

2. Then focus on the questions by topic => String, Two Pointers, Sliding Window, Binary Search, Recursion, Binary Tree, Backtracking, DFS, BFS, Graph, Linkedi List, Sort, Trie, Slack/Queue, Piority Queue, Dynamic Programming

Important => Array, String, Sorting, Counting

3. Sort by acceptance rate rather than difficulty

4. IMPORTANT NOTE: maximum 45 minutes per exercise! If you can't do it in that time, look at the solution. After learning the solution, look for a similar exercise and put the learning into practice.

5. Revisit the problems

6. Further ahead: Solve company-specific questions

#	Title	Solution	Acceptance	Difficulty	Summary
1	Two Sum	Python	53.5%	Easy	Description
4	Median of Two Sorted Arrays	Python	41.3%	Hard	Description
11	Container With Most Water	Python	56.0%	Medium	Description
13	Roman to Integer	Python	62.5%	Easy	Description
20	Valid Parentheses	Python	41.0%	Easy	Description
48	Rotate Image	Python	77.1%	Medium	Description
75	Sort Colors	Python	65.4%	Medium	Description
344	Reverse String	Python	79.0%	Easy	Description
349	Intersection of Two Arrays	Python	75.4%	Easy	Description
419	Battleships in a Board	Python	76.2%	Medium	Description
442	Find All Duplicates in an Array	Python	76.2%	Medium	Description
461	Hamming Distance	Python	75.9%	Easy	Description
509	Fibonacci Number	Python	72.6%	Easy	Description
557	Reverse Words in a String III	Python	83.3%	Easy	Description
561	Array Partition	Python	79.9%	Easy	Description
647	Palindromic Substrings	Python	70.8%	Medium	Description
657	Robot Return to Origin	Python	76.1%	Easy	Description
682	Baseball Game	Python	78.1%	Easy	Description
696	Count Binary Substrings	Python	65.7%	Easy	Description
709	To Lower Case	Python	83.6%	Easy	Description
728	Self Dividing Numbers	Python	79.3%	Easy	Description
771	Jewels and Stones	Python	88.8%	Easy	Description
786	K-th Smallest Prime Fraction	Python	68.3%	Medium	Description
804	Unique Morse Code Words	Python	83.0%	Easy	Description
821	Shortest Distance to a Character	Python	71.9%	Easy	Description
884	Uncommon Words from Two Sentences	Python	75.3%	Easy	Description
890	Find and Replace Pattern	Python	76.8%	Medium	Description
905	Sort Array By Parity	Python	76.3%	Easy	Description
917	Reverse Only Letters	Python	65.8%	Easy	Description
921	Minimum Add to Make Parentheses Valid	Python	74.7%	Medium	Description
922	Sort Array By Parity II	Python	70.9%	Easy	Description
942	DI String Match	Python	79.6%	Easy	Description
961	N-Repeated Element in Size 2N Array	Python	77.3%	Easy	Description
977	Squares of a Sorted Array	Python	73.0%	Easy	Description
986	Interval List Intersections	Python	72.0%	Medium	Description
1002	Find Common Characters	Python	74.5%	Easy	Description
1021	Remove Outermost Parentheses	Python	84.4%	Easy	Description
1051	Height Checker	Python	81.0%	Easy	Description
1108	Defanging an IP Address	Python	89.3%	Easy	Description
1207	Unique Number of Occurrences	Python	78.0%	Easy	Description
1221	Split a String in Balanced Strings	Python	86.4%	Easy	Description
1281	Subtract the Product and Sum of Digits of an Integer	Python	86.6%	Easy	Description
1282	Group the People Given the Group Size They Belong To	Python	87.4%	Medium	Description
1295	Find Numbers with Even Number of Digits	Python	77.7%	Easy	Description
1304	Find N Unique Integers Sum up to Zero	Python	76.2%	Easy	Description
1309	Decrypt String from Alphabet to Integer	Python	79.9%	Easy	Description
1310	XOR Queries of a Subarray	Python	78.5%	Medium	Description
1313	Decompress Run-Length Encoded List	Python	85.9%	Easy	Description
1323	Maximum 69 Number	Python	82.6%	Easy	Description
1332	Remove Palindromic Subsequences	Python	76.6%	Easy	Description
1342	Number of Steps to Reduce a Number to Zero	Python	85.4%	Easy	Description
1347	Minimum Number of Steps to Make Two Strings Anagram	Python	82.1%	Medium	Description
1351	Count Negative Numbers in a Sorted Matrix	Python	77.6%	Easy	Description
1356	Sort Integers by The Number of 1 Bits	Python	78.6%	Easy	Description
1365	How Many Numbers Are Smaller Than the Current Number	Python	87.0%	Easy	Description
1374	Generate a String With Characters That Have Odd Counts	Python	78.1%	Easy	Description
1389	Create Target Array in the Given Order	Python	86.1%	Easy	Description
1402	Reducing Dishes	Python	76.3%	Hard	Description
1409	Queries on a Permutation With Key	Python	84.4%	Medium	Description
1431	Kids With the Greatest Number of Candies	Python	87.8%	Easy	Description
1436	Destination City	Python	79.5%	Easy	Description
1450	Number of Students Doing Homework at a Given Time	Python	75.7%	Easy	Description
1455	Check If a Word Occurs As a Prefix of Any Word in a Sentence	Python	64.6%	Easy	Description
1460	Make Two Arrays Equal by Reversing Subarrays	Python	75.8%	Easy	Description
1464	Maximum Product of Two Elements in an Array	Python	83.0%	Easy	Description
1470	Shuffle the Array	Python	88.7%	Easy	Description
1475	Final Prices With a Special Discount in a Shop	Python	83.1%	Easy	Description
1480	Running Sum of 1d Array	Python	86.9%	Easy	Description
1486	XOR Operation in an Array	Python	86.3%	Easy	Description
1512	Number of Good Pairs	Python	89.3%	Easy	Description
1528	Shuffle String	Python	84.9%	Easy	Description
1534	Count Good Triplets	Python	81.6%	Easy	Description
1551	Minimum Operations to Make Array Equal	Python	82.3%	Medium	Description
1561	Maximum Number of Coins You Can Get	Python	84.4%	Medium	Description
1572	Matrix Diagonal Sum	Python	83.4%	Easy	Description
1588	Sum of All Odd Length Subarrays	Python	83.3%	Easy	Description
1603	Design Parking System	Python	88.0%	Easy	Description
1614	Maximum Nesting Depth of the Parentheses	Python	83.9%	Easy	Description
1636	Sort Array by Increasing Frequency	Python	80.0%	Easy	Description
1641	Count Sorted Vowel Strings	Python	78.7%	Medium	Description
1652	Defuse the Bomb	Python	79.3%	Easy	Description
1662	Check If Two String Arrays are Equivalent	Python	85.6%	Easy	Description
1672	Richest Customer Wealth	Python	88.3%	Easy	Description
1678	Goal Parser Interpretation	Python	87.4%	Easy	Description
1684	Count the Number of Consistent Strings	Python	83.6%	Easy	Description
1688	Count of Matches in Tournament	Python	85.8%	Easy	Description
1689	Partitioning Into Minimum Number Of Deci-Binary Numbers	Python	88.7%	Medium	Description
1700	Number of Students Unable to Eat Lunch	Python	78.5%	Easy	Description
1704	Determine if String Halves Are Alike	Python	78.7%	Easy	Description
1716	Calculate Money in Leetcode Bank	Python	78.5%	Easy	Description
1720	Decode XORed Array	Python	86.7%	Easy	Description
1725	Number Of Rectangles That Can Form The Largest Square	Python	78.9%	Easy	Description
1732	Find the Highest Altitude	Python	83.7%	Easy	Description
1748	Sum of Unique Elements	Python	78.7%	Easy	Description
1768	Merge Strings Alternately	Python	80.8%	Easy	Description
1769	Minimum Number of Operations to Move All Balls to Each Box	Python	86.0%	Medium	Description
1773	Count Items Matching a Rule	Python	84.7%	Easy	Description
1812	Determine Color of a Chessboard Square	Python	78.8%	Easy	Description
1816	Truncate Sentence	Python	85.6%	Easy	Description
1827	Minimum Operations to Make the Array Increasing	Python	80.6%	Easy	Description
1832	Check if the Sentence Is Pangram	Python	83.6%	Easy	Description
1837	Sum of Digits in Base K	Python	77.7%	Easy	Description
1844	Replace All Digits with Characters	Python	81.7%	Easy	Description
1859	Sorting the Sentence	Python	83.5%	Easy	Description
1877	Minimize Maximum Pair Sum in Array	Python	81.4%	Medium	Description
1880	Check if Word Equals Summation of Two Words	Python	74.6%	Easy	Description
1910	Remove All Occurrences of a Substring	Python	78.0%	Medium	Description
1913	Maximum Product Difference Between Two Pairs	Python	82.9%	Easy	Description
1920	Build Array from Permutation	Python	90.1%	Easy	Description
1929	Concatenation of Array	Python	90.2%	Easy	Description
1941	Check if All Characters Have Equal Number of Occurrences	Python	78.0%	Easy	Description
1963	Minimum Number of Swaps to Make the String Balanced	Python	78.0%	Medium	Description
1967	Number of Strings That Appear as Substrings in Word	Python	81.2%	Easy	Description
1974	Minimum Time to Type Word Using Special Typewriter	Python	76.8%	Easy	Description
1979	Find Greatest Common Divisor of Array	Python	78.5%	Easy	Description
2000	Reverse Prefix of Word	Python	86.3%	Easy	Description
2006	Count Number of Pairs With Absolute Difference K	Python	84.4%	Easy	Description
2011	Final Value of Variable After Performing Operations	Python	89.4%	Easy	Description
2023	Number of Pairs of Strings With Concatenation Equal to Target	Python	75.1%	Medium	Description
2037	Minimum Number of Moves to Seat Everyone	Python	87.4%	Easy	Description
2053	Kth Distinct String in an Array	Python	82.0%	Easy	Description
2089	Find Target Indices After Sorting Array	Python	77.1%	Easy	Description
2103	Rings and Rods	Python	80.9%	Easy	Description
2108	Find First Palindromic String in the Array	Python	83.9%	Easy	Description
2114	Maximum Number of Words Found in Sentences	Python	86.6%	Easy	Description
2119	A Number After a Double Reversal	Python	80.9%	Easy	Description
2125	Number of Laser Beams in a Bank	Python	85.6%	Medium	Description
2149	Rearrange Array Elements by Sign	Python	84.1%	Medium	Description
2160	Minimum Sum of Four Digit Number After Splitting Digits	Python	86.2%	Easy	Description
2161	Partition Array According to Given Pivot	Python	85.2%	Medium	Description
2169	Count Operations to Obtain Zero	Python	74.7%	Easy	Description
2176	Count Equal and Divisible Pairs in an Array	Python	79.5%	Easy	Description
2185	Counting Words With a Given Prefix	Python	78.4%	Easy	Description
2194	Cells in a Range on an Excel Sheet	Python	83.9%	Easy	Description
2215	Find the Difference of Two Arrays	Python	80.2%	Easy	Description
2220	Minimum Bit Flips to Convert Number	Python	87.4%	Easy	Description
2221	Find Triangular Sum of an Array	Python	78.8%	Medium	Description
2235	Add Two Integers	Python	88.0%	Easy	Description
2315	Count Asterisks	Python	82.4%	Easy	Description
2317	Maximum XOR After Operations	Python	79.3%	Medium	Description
2325	Decode the Message	Python	84.7%	Easy	Description
2341	Maximum Number of Pairs in Array	Python	75.5%	Easy	Description
2363	Merge Similar Items	Python	76.6%	Easy	Description
2367	Number of Arithmetic Triplets	Python	84.5%	Easy	Description
2390	Removing Stars From a String	Python	77.3%	Medium	Description
2391	Minimum Amount of Time to Collect Garbage	Python	85.2%	Medium	Description
2410	Maximum Matching of Players With Trainers	Python	64.5%	Medium	Description
2413	Smallest Even Multiple	Python	88.0%	Easy	Description
2418	Sort the People	Python	84.9%	Easy	Description
2427	Number of Common Factors	Python	79.4%	Easy	Description
2433	Find The Original Array of Prefix Xor	Python	88.0%	Medium	Description
2441	Largest Positive Integer That Exists With Its Negative	Python	75.0%	Easy	Description
2442	Count Number of Distinct Integers After Reverse Operations	Python	80.0%	Medium	Description
2460	Apply Operations to an Array	Python	68.2%	Easy	Description
2469	Convert the Temperature	Python	89.9%	Easy	Description
2485	Find the Pivot Integer	Python	83.8%	Easy	Description
2486	Append Characters to String to Make Subsequence	Python	73.0%	Medium	Description
2500	Delete Greatest Value in Each Row	Python	78.7%	Easy	Description
2520	Count the Digits That Divide a Number	Python	85.2%	Easy	Description
2529	Maximum Count of Positive Integer and Negative Integer	Python	74.5%	Easy	Description
2535	Difference Between Element Sum and Digit Sum of an Array	Python	84.8%	Easy	Description
2553	Separate the Digits in an Array	Python	80.0%	Easy	Description
2562	Find the Array Concatenation Value	Python	70.4%	Easy	Description
2570	Merge Two 2D Arrays by Summing Values	Python	74.0%	Easy	Description
2574	Left and Right Sum Differences	Python	87.1%	Easy	Description
2651	Calculate Delayed Arrival Time	Python	77.5%	Easy	Description
2652	Sum Multiples	Python	85.2%	Easy	Description
2656	Maximum Sum With Exactly K Elements	Python	81.7%	Easy	Description
2670	Find the Distinct Difference Array	Python	77.6%	Easy	Description
2678	Number of Senior Citizens	Python	81.7%	Easy	Description
2696	Minimum String Length After Removing Substrings	Python	77.5%	Easy	Description
2697	Lexicographically Smallest Palindrome	Python	82.3%	Easy	Description
2710	Remove Trailing Zeros From a String	Python	78.9%	Easy	Description
2716	Minimize String Length	Python	76.9%	Easy	Description
2733	Neither Minimum nor Maximum	Python	76.3%	Easy	Description
2744	Find Maximum Number of String Pairs	Python	81.9%	Easy	Description
2769	Find the Maximum Achievable Number	Python	90.9%	Easy	Description
2778	Sum of Squares of Special Elements	Python	81.1%	Easy	Description
2785	Sort Vowels in a String	Python	80.7%	Medium	Description
2788	Split Strings by Separator	Python	75.6%	Easy	Description
2798	Number of Employees Who Met the Target	Python	87.7%	Easy	Description
2810	Faulty Keyboard	Python	84.1%	Easy	Description
2824	Count Pairs Whose Sum is Less than Target	Python	87.5%	Easy	Description
2828	Check if a String Is an Acronym of Words	Python	83.2%	Easy	Description
2859	Sum of Values at Indices With K Set Bits	Python	86.0%	Easy	Description
2864	Maximum Odd Binary Number	Python	83.2%	Easy	Description
2880	Select Data	Python	79.3%	Easy	Description
2894	Divisible and Non-divisible Sums Difference	Python	89.3%	Easy	Description
2913	Subarrays Distinct Element Sum of Squares I	Python	81.8%	Easy	Description
2932	Maximum Strong Pair XOR I	Python	75.4%	Easy	Description
2938	Separate Black and White Balls	Python	64.9%	Medium	Description
2942	Find Words Containing Character	Python	88.7%	Easy	Description
2951	Find the Peaks	Python	75.3%	Easy	Description
2956	Find Common Elements Between Two Arrays	Python	83.8%	Easy	Description
2960	Count Tested Devices After Test Operations	Python	79.6%	Easy	Description
2974	Minimum Number Game	Python	85.5%	Easy	Description
3005	Count Elements With Maximum Frequency	Python	78.3%	Easy	Description
3016	Minimum Number of Pushes to Type Word II	Python	80.7%	Medium	Description
3019	Number of Changing Keys	Python	81.0%	Easy	Description
3042	Count Prefix and Suffix Pairs I	Python	77.8%	Easy	Description
3065	Minimum Operations to Exceed Threshold Value I	Python	85.8%	Easy	Description
3099	Harshad Number	Python	83.0%	Easy	Description
3110	Score of a String	Python	93.1%	Easy	Description
3131	Find the Integer Added to Array I	Python	81.9%	Easy	Description
3146	Permutation Difference between Two Strings	Python	89.2%	Easy	Description
3158	Find the XOR of Numbers Which Appear Twice	Python	81.0%	Easy	Description
3162	Find the Number of Good Pairs I	Python	85.8%	Easy	Description
3168	Minimum Number of Chairs in a Waiting Room	Python	80.6%	Easy	Description
3184	Count Pairs That Form a Complete Day I	Python	78.2%	Easy	Description
3190	Find Minimum Operations to Make All Elements Divisible by Three	Python	89.6%	Easy	Description
3194	Minimum Average of Smallest and Largest Elements	Python	85.4%	Easy	Description
3223	Minimum Length of String After Operations	Python	75.2%	Medium	Description
3232	Find if Digit Game Can Be Won	Python	82.3%	Easy	Description
3239	Minimum Number of Flips to Make Binary Grid Palindromic I	Python	78.3%	Medium	Description
3248	Snake in Matrix	Python	82.1%	Easy	Description
3270	Find the Key of the Numbers	Python	76.9%	Easy	Description
3271	Hash Divided String	Python	84.6%	Medium	Description
3280	Convert Date to Binary	Python	88.2%	Easy	Description
3285	Find Indices of Stable Mountains	Python	86.8%	Easy	Description
3289	The Two Sneaky Numbers of Digitville	Python	88.9%	Easy	Description
3300	Minimum Element After Replacement With Digit Sum	Python	83.8%	Easy	Description
3324	Find the Sequence of Strings Appeared on the Screen	Python	80.4%	Medium	Description
3340	Check Balanced String	Python	83.4%	Easy	Description
3370	Smallest Number With All Set Bits	Python	76.6%	Easy	Description
3432	Count Partitions with Even Sum Difference	Python	79.5%	Easy	Description