LeetCode

Overview

This repository contains my LeetCode submissions, with entries sorted by:

• Difficulty: Easy, Medium, Hard.
• Question title.

The entries were used to solve challenges listed in my Programming repository.

(Note: Rank is the percentage of submissions that my code outperformed in terms of runtime.)

Easy

Question	Submission	Runtime	Rank
Add Binary	Java	5ms	19%
Add Digits	Java	0ms	100%
Alternating Digit Sum	Java	0ms	100%
Apply Operations to an Array	Java	1ms	95.99%
Base 7	Java	1ms	70.47%
Best Time To Buy And Sell Stock	Java	2ms	72.40%
Binary Number with Alternating Bits	Java	1ms	10.77%
Binary Search	Java	0ms	100%
Check if All Characters Have Equal Number of Occurrences	Java	1ms	100%
Check if Every Row and Column Contains All Numbers	Java	4ms	92.01%
Check if Matrix Is X-Matrix	Java	0ms	100%
Check If N And Its Double Exist	Java	2ms	94.12%
Concatenation of Array	Java	1ms	96.28%
Contains Duplicate	Java	10ms	88.34%
Contains Duplicate II	Java	18ms	82.31%
Convert Binary Number in a Linked List to Integer	Java	0ms	100%
Convert Date to Binary	Java	4ms	66.45%
Convert the Temperature	Java	0ms	100%
Count Integers With Even Digit Sum	Java	1ms	86.87%
Count Negative Numbers In A Sorted Matrix	Java	0ms	100%
Count the Number of Consistent Strings	Java	6ms	86.92%
Counting Bits	Java	10ms	9.36%
Destination City	Java	2ms	100%
Difference Between Element Sum and Digit Sum of an Array	Java	2ms	98.35%
Faulty Keyboard	Java	3ms	98.26%
Fibonacci Number	Java	0ms	100%
Find All Numbers Disappeared In An Array	Java	3ms	99.85%
Find Indices of Stable Mountains	Java	1ms	100%
Find Letter to Appear Twice	Java	0ms	100%
Find Numbers with Even Number of Digits	Java	1ms	98.93%
Find Pivot Index	Java	1ms	94.56%
Find the Difference	Java	2ms	62.27%
Find the Difference of Two Arrays	Java	11ms	45.10%
Find the Distinct Difference Array	Java	5ms	93.20%
Find the Highest Altitude	Java	0ms	100%
Find the Index of the First Occurrence in a String	Java	0ms	100%
Find the Middle Index in Array	Java	0ms	100%
Find the Peaks	Java	1ms	100%
First Bad Version	Java	24ms	98.13%
First Unique Character in a String	Java	5ms	93.93%
FizzBuzz	Java	1ms	99.29%
Happy Number	Java	0ms	100%
How Many Numbers Are Smaller Than the Current Number	Java	5ms	83.20%
Implement Queue Using Stacks	Java	0ms	100%
Implement Stack Using Queues	Java	0ms	100%
Intersection of Multiple Arrays	Java	2ms	100%
Intersection of Two Arrays	Java	1ms	98.70%
Intersection of Two Arrays II	Java	1ms	98.45%
Is Subsequence	Java	1ms	93.37%
Isomorphic Strings	Java	13ms	52.01%
Kth Missing Positive Number	Java	2ms	11.57%
Left and Right Sum Differences	Java	2ms	98.18%
Linked List Cycle	Java	0ms	100%
Longest Common Prefix	Java	1ms	64.40%
Majority Element	Java	2ms	99.80%
Matrix Diagonal Sum	Java	0ms	100%
Maximum Count of Positive Integer and Negative Integer	Java	0ms	100%
Maximum Depth of Binary Tree	Java	0ms	100%
Merge Two Sorted Lists	Java	0ms	100%
Middle of the Linked List	Java	0ms	100%
Minimum Common Value	Java	2ms	86.22%
Missing Number	Java	1ms	36.78%
Most Frequent Even Element	Java	12ms	93.70%
Move Zeroes	Java	1ms	99.85%
Next Greater Element I	Java	3ms	92.50%
Number of 1 Bits	Java	0ms	100%
Number of Common Factors	Java	1ms	44.28%
Palindrome Number	Java	6ms	30.91%
Percentage of Letter in String	Java	0ms	100%
Permutation Difference between Two Strings	Java	1ms	100%
Power of Four	Java	0ms	100%
Power of Three	Java	7ms	100%
Power of Two	Java	0ms	100%
Range Sum Query - Immutable	Java	8ms	65.10%
Ransom Note	Java	1ms	99.52%
Remove Duplicates from Sorted Array	Java	1ms	64.98%
Remove Element	Java	0ms	100%
Remove Linked List Elements	Java	1ms	94%
Reverse Linked List	Java	4ms	98.74%
Reverse String	Java	0ms	100%
Reverse Vowels of a String	Java	4ms	50.91%
Richest Customer Wealth	Java	0ms	100%
Row With Maximum Ones	Java	5ms	27.61%
Running Sum of 1d Array	Java	0ms	100%
Search Insert Position	Java	0ms	100%
Separate the Digits in an Array	Java	5ms	74.92%
Set Mismatch	Java	2ms	95.73%
Smallest Even Multiple	Java	0ms	100%
Smallest Missing Integer Greater Than Sequential Prefix Sum	Java	1ms	92.66%
Sort the People	Java	0ms	94.45%
Sqrt(x)	Java	1ms	87.09%
Squares of a Sorted Array	Java	1ms	100%
Sum of Digits in Base K	Java	0ms	100%
Sum of Digits of String After Convert	Java	1ms	89.59%
Sum of Squares of Special Elements	Java	1ms	100%
Sum of Unique Elements	Java	0ms	100%
Third Maximum Number	Java	6ms	25.57%
Three Divisors	Java	1ms	61.86%
To Lower Case	Java	0ms	100%
Two Sum	Java	1ms	98.25%
Ugly Number	Java	0ms	100%
Valid Anagram	Java	3ms	90.36%
Valid Palindrome	Java	4ms	54.42%
Valid Parentheses	Java	2ms	97.66%
Valid Perfect Square	Java	0ms	100%
Word Pattern	Java	1ms	82.52%
XOR Operation in an Array	Java	0ms	100%
Zigzag Grid Traversal With Skip	Java	1ms	100%
Article Views I	SQL	619ms	51.14%
Big Countries	SQL	461ms	66.33%
Biggest Single Number	SQL	406ms	82.18%
Classes More Than 5 Students	SQL	471ms	96.18%
Combine Two Tables	SQL	629ms	96.12%
Customers Placing The Largest Number Of Orders	SQL	799ms	87.57%
Customers Who Never Order	SQL	908ms	93.29%
Duplicate Emails	SQL	865ms	11.83%
Employee Bonus	SQL	1659ms	64.38%
Employees Earning More Than Their Managers	SQL	1429ms	10.98%
Not Boring Movies	SQL	495ms	47.80%
Product Sales Analysis I	SQL	1896ms	83.84%
Project Employees I	SQL	1032ms	62.20%

Medium

Question	Submission	Runtime	Rank
Add Two Numbers	Java	11ms	4.35%
Check if Number is a Sum of Powers of Three	Java	0ms	100%
Container With Most Water	Java	5ms	74.40%
Count Primes	Java	94ms	82.87%
Daily Temperatures	Java	77ms	31.05%
Divide Two Integers	Java	4ms	5.66%
Find All Anagrams in a String	Java	9ms	91.31%
Find First and Last Position of Element in Sorted Array	Java	0ms	100%
Find Good Days to Rob the Bank	Java	5ms	88.83%
Find Minimum in Rotated Sorted Array	Java	0ms	100%
Find Peak Element	Java	0ms	100%
Find the Duplicate Number	Java	4ms	88.06%
Kth Largest Element In An Array	Java	39ms	73.11%
Kth Smallest Element In A Sorted Matrix	Java	15ms	55.37%
Longest Substring Without Repeated Characters	Java	6ms	70.02%
Majority Element II	Java	10ms	45.32%
Next Greater Element II	Java	9ms	94.03%
Peak Index in a Mountain Array	Java	0ms	100%
Product of Array Except Self	Java	2ms	89.32%
Reverse Integer	Java	0ms	100%
Search in Rotated Sorted Array	Java	0ms	100%
Search in Rotated Sorted Array II	Java	0ms	100%
Set Matrix Zeroes	Java	1ms	73.86%
Smallest Number in Infinite Set	Java	16ms	33.15%
Sort Characters By Frequency	Java	13ms	74.79%
Sort an Array	Java	41ms	26.79%
Spiral Matrix	Java	0ms	100%
Sum of Square Numbers	Java	3ms	93.35%
Sum of Two Integers	Java	0ms	100%
Top K Frequent Elements	Java	14ms	57.29%
Top K Frequent Words	Java	6ms	98.00%
Two Input Sum II - Input Array Is Sorted	Java	2ms	93.40%
Ugly Number II	Java	2ms	98.25%
Second Highest Salary	SQL	480ms	64.38%

Hard

Question	Submission	Runtime	Rank
Find in Mountain Array	Java	0ms	100%
First Missing Positive	Java	1ms	100%
Merge k Sorted Lists	Java	5ms	35.39%