- Saimon398/leetcode-solutions: A tiny collection of all my leetcode solutions in JS, Python and SQL

Here you can find solutions in JavaScript, Python and SQL languages for some problems from LeetCode. You also can participate in solving these problems by proposing your solution. Don't hesitate to pull your ideas here and enjoy LeetCode.

Number	Question	Hint	JS Solution	Python Solution
1	Two Sum	Use a hash table to keep track of the indices of the numbers you've encountered so far.	JS Solution	Python Solution
3	Longest Substring Without Repeating Chars	What if index of the first occurrence might help?	JS Solution	Python Solution
7	Reverse Integer		JS Solution	Python Solution
9	Palindrome Number	Use two pointers to make it work faster. Beware of overflow.	JS Solution	Python Solution
20	Valid Parentheses	Use a stack of characters. When you encounter a closing bracket, check if the top of the stack was the opening for it. If yes, pop it from the stack. Otherwise, return false.	JS Solution	Python Solution
28	Find the Index of the First Occurrence in a String		JS Solution	Python Solution
32	Longest Valid Parentheses	Use a stack of characters.	JS Solution	Python Solution
34	Find First and Last Position of Element in Sorted Array	Binary Search	JS Solution	Python Solution
35	Search Insert Position	Use binary search	JS Solution	Python Solution
42	Trapping Rain Water		JS Solution	Python Solution
58	Length of Last Word	Filter out the words and empty strings in the words array. Don't forget about removing spaces.	JS Solution	Python Solution
62	Unique Paths	Dynamic programming is one of the effective ways to solve it. Just find recurrent formula.	JS Solution	Python Solution
63	Unique Paths II	Use dynamic programming since, from each cell, you can move to the right or down.	JS Solution	Python Solution
64	Minimum Path Sum	Remember that from the second cell, the value of the current cell is the price of the current cell plus the minimum value of the previous ones	JS Solution	Python Solution
66	Plus One	Try iterating through each digit backwards. What do you do when the digit is a 9?	JS Solution	Python Solution
69	Sqrt	Use binary search to make algorithm work faster	JS Solution	Python Solution
70	Climbing Stairs	To reach nth step, what could have been your previous steps?	JS Solution	Python Solution
75	Sort Colors	Overwrite array with the total number of 0's, then 1's and followed by 2's. Any sort might be appropriate solution.	JS Solution	Python Solution
88	Merge Sorted Array	You can easily solve this problem if you simply think about two elements at a time rather than two arrays. We know that each of the individual arrays is sorted. What we don't know is how they will intertwine. Can we take a local decision and arrive at an optimal solution?	JS Solution	Python Solution
122	Best Time to Buy and Sell Stock II	What should we do every time there is a valley followed by a peak in price?	JS Solution	Python Solution
125	Valid Palindrome	Use Two Pointers	JS Solutions	Python Solution
136	Single Number	Use Bit Manipulations (XOR)	JS Solution	Python Solution
151	Reverse Words in a String		JS Solution	Python Solution
155	Min Stack		JS Solution	Python Solution
169	Majority Element		JS Solution	Python Solution
191	Number of 1 Bits	Use Bit Manipulations	JS Solution	Python Solution
197	Rising Temperature		SQL Solution	Pandas Solution
202	Happy Number		JS Solution	Python Solution
204	Count Primes	Use Sieve of Eratosthenes.	JS Solution	Python Solution
206	Reverse Linked List		JS Solution	Python Solution
217	Contains Duplicate		JS Solution	Python Solution
231	Power Of Two	Think of Bit Manipulations	JS Solution	Python Solution
232	Implement Queue using Stacks		JS Solution	Python Solution
242	Valid Anagram		JS Solution	Python Solution
263	Ugly Number		JS Solution	Python Solution
264	Ugly Number II	Dynamic Programming	JS Solution	Python Solution
268	Missing Number	Bit Manipulation is One of the Options	JS Solution	Python Solution
300	Longest Increasing Subsequence	Compare two last nums in sequence and subsequence. If both are equal, length of LIS is increased by 1	JS Solution	Python Solution
322	Coin Change	Think how to use a knapsack problem	JS Solution	Python Solution
326	Power of Three		JS Solution	Python Solution
342	Power of Four	Bit Manipulations	JS Solutions	Python Solution
344	Reverse String	The entire logic for reversing a string is based on using the opposite directional two-pointer approach	JS Solution	Python Solution
345	Reverse Vowels of a String		JS Solution	Python Solution
367	Valid Perfect Square		JS Solution	Python Solution
389	Find The Difference		JS Solution	Python Solution
392	Is Subsequence	Use two pointers to iterate through the two strings simultaneously.	JS Solution	Python Solution
412	Fizz Buzz	The first non-standard value must satisfy both conditions.	JS Solution	Python Solution
421	Maximum XOR of Two Numbers in an Array		JS Solution	Python Solution
451	Sort Characters By Frequency		JS Solution	Python Solution
461	Hamming Distance	Bit Manipulation (XOR)	JS Solution	Python Solution
504	Base 7	Gorner's algorithm can help with this problem	JS Solution	Python Solution
516	Longest Palindromic Subsequence		JS Solution	Python Solution
557	Reverse Words in a String III		JS Solution	Python Solution
550	Game Analysis IV		SQL Solution	Pandas Solution
577	Employee Bonus		SQL Solution	Pandas Solution
580	Managers With At Least 5 Direct Reports		SQL Solution	Pandas Solution
584	Find Customer Referee		SQL Solution	Pandas Solution
595	Big Countries		SQL Solution	Pandas Solution
596	Classes More Than 5 Students		SQL Solution	Pandas Solution
610	Triangle Judgement		SQL Solution	Pandas Solution
619	Biggest Single Number		SQL Solution	Pandas Solution
620	Not Boring Movies		SQL Solution	Pandas Solution
704	Binary Search		JS Solution	Python Solution
771	Jewels and Stones		JS Solution	Python Solution
1045	Customers Who Bought All Products		SQL Solution	Pandas Solution
1068	Products Sales Analysis I		SQL Solution	Pandas Solution
1070	Products Sales Analysis III		SQL Solution	Pandas Solution
1075	Project Employees I		SQL Solution	Pandas Solution
1137	N-th Tribonacci Number	Use dynamic programming	JS Solution	Python Solution
1141	User Activity for the Past 30 Days I		SQL Solution	Pandas Solution
1143	Longest Common Subsequence	Try dynamic programming. DP[i][j] represents the longest common subsequence of text1[0 ... i] & text2[0 ... j].	JS Solution	Python Solution
1148	Article Views I		SQL Solution	Pandas Solution
1174	Immediate Food Delivery II		SQL Solution	Pandas Solution
1193	Monthly Transactions I		SQL Solution	Pandas Solution
1207	Unique Number of Occurrences	Find the number of occurrences of each element in the array using a hash map.	JS Solution	Python Solution
1211	Queries Quality And Percentage		SQL Solution	Pandas Solution
1251	Average Selling Price		SQL Solution	Pandas Solution
1280	Students And Examinations		SQL Solution	Pandas Solution
1287	Element Appearing More Than 25% In Sorted Array		JS Solution	Python Solution
1378	Replace Employee ID With The Unique Identifier		SQL Solution	Pandas Solution
1381	Design a Stack With Increment Operation		JS Solution	Python Solution
1523	Count Odd Numbers in an Interval Range		JS Solution	Python Solution
1581	Customer Who Visited But Did Not Make Any Transactions		SQL Solution	Pandas Solution
1633	Percentage Of Users Attended A Contest		SQL Solution	Pandas Solution
1661	Average Time Of Process Per Machine		SQL Solution	Pandas Solution
1683	Invalid Tweets		SQL Solution	Pandas Solution
1729	Find Followers Count		SQL Solution	Pandas Solution
1731	The Number Of Employee Which Report To Each Employee		SQL Solution	Pandas Solution
1757	Recycle And Low Fat Products		SQL Solution	Pandas Solution
1934	Confirmation Rate		SQL Solution	Pandas Solution
1934	Confirmation Rate		SQL Solution	Pandas Solution
2356	Number of Unique Subjects Taught by Each Teacher		SQL Solution	Pandas Solution
2455	Average Value of Even Numbers That Are Divisible by Three		JS Solution	Python Solution

Name		Name	Last commit message	Last commit date
Latest commit History 166 Commits
js_solutions		js_solutions
python_solutions		python_solutions
sql_solutions		sql_solutions
tests		tests
.eslintrc.yml		.eslintrc.yml
.gitignore		.gitignore
Makefile		Makefile
README.md		README.md
package-lock.json		package-lock.json
package.json		package.json

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