Competitive Programming Solutions

Competitive programming problems solutions

Time Spent includes time to read a problem, problem solving, coding and testing 😉.

Platform analytics

No.	Name	Easy	Medium	Hard	Total
1.	Codeforces	3	2	0	5
2.	GeeksforGeeks	1	0	0	1
3.	HackerRank	49	0	1	50
4.	LeetCode	62	104	1	167

Problem Solved

No	Problem	Difficulty	Tags	Platform	Tries	Time Spent (Min)	Programming Language
1.	Fizz Buzz	Easy	Math String	LeetCode	#1	2	Python
2.	Grading Students	Easy	Math Implementation	HackerRank	#1	6	Python
3.	Domino piling	Easy	Math	Codeforces	#1	10	Python
4.	Sorting: Bubble Sort	Easy	Sorting	HackerRank	#1	5	Python
5.	Insertion Sort - Part 1	Easy	Sorting	HackerRank	#1	11	Python
6.	Counting Sort 1	Easy	Sorting	HackerRank	#2	5	Python
7.	Selection Sort	Easy	Sorting	GeeksforGeeks	#1	2	Python
8.	Sorting the Sentence	Easy	Sorting	LeetCode	#1	3	Python
9.	How Many Numbers Are Smaller Than the Current Number	Easy	Sorting	LeetCode	#1	2	Python
10.	Find Target Indices After Sorting Array	Easy	Sorting	LeetCode	#1	2	Python
11.	Sort Colors	Medium	Sorting	LeetCode	#1	5	Python
12.	K Closest Points to Origin	Medium	Sorting	LeetCode	#1	2	Python
13.	Merge Intervals	Medium	Sorting	LeetCode	#2	8	Python
14.	Largest Number	Medium	Sorting	LeetCode	#4	57	Python
15.	Array With Elements Not Equal to Average of Neighbors	Medium	Sorting	LeetCode	#2	22	Python
16.	Find the Kth Largest Integer in the Array	Medium	Sorting	LeetCode	#1	2	Python
17.	Find Original Array From Doubled Array	Medium	Sorting	LeetCode	#1	15	Python
18.	Frequency of the Most Frequent Element	Medium	Sorting	LeetCode	#3	102	Python
19.	Number of Good Pairs	Easy	Math Array	LeetCode	#1	1	Python
20.	Counting Valleys	Easy	Implementation	LeetCode	#1	12	Python
21.	Theatre square	Easy	Math	CodeForces	#1	2	Python
22.	Max Number of K-Sum Pairs	Medium	Sorting	LeetCode	#3	42	Python
23.	Arithmetic Subarrays	Medium	Sorting	LeetCode	#1	6	Python
24.	Maximum Number of Coins You Can Get	Medium	Sorting	LeetCode	#1	9	Python
25.	Minimize Maximum Pair Sum in Array	Medium	Sorting	LeetCode	#1	6	Python
26.	Pancake Sorting	Medium	Sorting	LeetCode	#1	26	Python
27.	Reduce Array Size to The Half	Medium	Sorting	LeetCode	#1	4	Python
28.	Top K Frequent Elements	Medium	Sorting	LeetCode	#1	2	Python
29.	Valid Parentheses	Easy	Stack	LeetCode	#1	2	Python
30.	Implement Queue using Stacks	Easy	Stack	LeetCode	#1	2	Python
31.	Evaluate Reverse Polish Notation	Medium	Stack	LeetCode	#1	5	Python
32.	Min Stack	Medium	Stack	LeetCode	#3	20	Python
33.	Reverse Substrings Between Each Pair of Parentheses	Medium	Stack	LeetCode	#1	5	Python
34.	Design Circular Deque	Medium	Queue	LeetCode	#2	20	Python
35.	Task Scheduler	Medium	Queue	LeetCode	#1	33	Python
36.	Next Greater Element I	Easy	Monotonic Stack	LeetCode	#1	13	Python
37.	Daily Temperatures	Medium	Monotonic Stack	LeetCode	#5	55	Python
38.	Car Fleet	Medium	Monotonic Stack	LeetCode	#2	75	Python
39.	Valid Palindrome	Easy	String	LeetCode	#1	2	Python
40.	Python Lists	Easy	List	HackerRank	#1	9	Python
41.	Text Wrap	Easy	Implemenation	HackerRank	#1	2	Python
42.	Python Print	Easy	Implemenation	HackerRank	#1	1	Python
43.	Swap Case	Easy	Implemenation	HackerRank	#1	1	Python
44.	Missing Number	Easy	Hash Table	LeetCode	#1	2	Python
45.	Valid Anagram	Easy	Hash Table	LeetCode	#1	5	Python
46.	Two Sum	Easy	Hash Table	LeetCode	#1	3	Python
47.	Reverse Integer	Medium	Math	LeetCode	#3	9	Python
48.	Multiply Strings	Medium	String	LeetCode	#1	9	Python
49.	Find Duplicate File in System	Medium	Hash Table	LeetCode	#1	6	Python
50.	Adding Spaces to a String	Medium	String	LeetCode	#1	4	Python
51.	Subdomain Visit Count	Medium	Hash Table	LeetCode	#2	14	Python
52.	Replace Elements in an Array	Medium	Hash Table	LeetCode	#1	4	Python
53.	Remove Smallest	Easy	Sorting	Codeforces	#1	7	Python
54.	Less or Equal	Medium	Sorting	Codeforces	#3	16	Python
55.	Ehab Is an Odd Person	Medium	Sorting	Codeforces	#2	12	Python
56.	Arithmetic Operators	Easy	Math	HackerRank	#1	1	Python
57.	Python: Division	Easy	Math	HackerRank	#1	1	Python
58.	Convert the Temperature	Easy	Math	LeetCode	#1	1	Python
59.	Find Three Consecutive Integers That Sum to a Given Number	Medium	Math	LeetCode	#1	4	Python
60.	Max Consecutive Ones	Easy	Implementation	LeetCode	#1	3	Python
61.	String Split and Join	Easy	String	HackerRank	#1	1	Python
62.	What's Your Name?	Easy	String	HackerRank	#1	1	Python
63.	Smallest Even Multiple	Easy	Math	LeetCode	#1	1	Python
64.	Python If-Else	Easy	Math	HackerRank	#1	1	Python
65.	Loops	Easy	Math	HackerRank	#1	1	Python
66.	Power - Mod Power	Easy	Math	HackerRank	#1	1	Python
67.	Longest Common Prefix	Easy	String	LeetCode	#1	7	Python
68.	Merge Strings Alternately	Easy	String	LeetCode	#1	2	Python
69.	Defanging an IP Address	Easy	String	LeetCode	#1	1	Python
70.	Find the Difference	Easy	String	LeetCode	#1	2	Python
71.	Reverse Words in a String	Medium	String	LeetCode	#1	1	Python
72.	Array Manipulation	Hard	Data Structures	HackerRank	#1	1	Python
73.	Day 8: Dictionaries and Maps	Easy	Tutorials	HackerRank	#1	1	Python
74.	Nested Lists	Easy	Python	HackerRank	#2	3	Python
75.	List Comprehensions	Easy	Python	HackerRank	#1	1	Python
76.	Find the Runner-Up Score!	Easy	Python	HackerRank	#2	2	Python
77.	Day 2: Operators	Easy	Tutorials	HackerRank	#1	1	C++
78.	Day 1: Data Types	Easy	Tutorials	HackerRank	#1	1	C++
79.	Sorting: Bubble Sort	Easy	Implementation	HackerRank	#2	1	C++
80.	Find the Point	Easy	Mathematics	HackerRank	#1	1	C++
81.	Vector-Erase	Easy	C++	HackerRank	#1	1	C++
82.	Vector-Sort	Easy	C++	HackerRank	#1	1	C++
83.	Classes and Objects	Easy	C++	HackerRank	#1	1	C++
84.	Structs	Easy	C++	HackerRank	#1	1	C++
85.	Strings	Easy	C++	HackerRank	#1	1	C++
86.	StringStream	Easy	C++	HackerRank	#1	1	C++
87.	Variable Sized Arrays	Easy	C++	HackerRank	#1	1	C++
88.	Arrays Introduction	Easy	C++	HackerRank	#1	1	C++
89.	Pointer	Easy	C++	HackerRank	#1	1	C++
90.	Functions	Easy	C++	HackerRank	#1	1	C++
91.	For Loop	Easy	C++	HackerRank	#1	1	C++
92.	Conditional Statements	Easy	C++	HackerRank	#1	1	C++
93.	Basic Data Types	Easy	C++	HackerRank	#1	1	C++
94.	Say "Hello, World!" With C++	Easy	C++	HackerRank	#1	1	C++
95.	Day 0: Hello, World.	Easy	Tutorials	HackerRank	#1	1	C++
96.	Solve Me First	Easy	Algorithms	HackerRank	#2	1	C++
97.	Grading Students	Easy	Algorithms	HackerRank	#2	1	C++
98.	Time Conversion	Easy	Algorithms	HackerRank	#2	9	Python
99.	Birthday Cake Candles	Easy	Algorithms	HackerRank	#1	1	C++
100.	Mini-Max Sum	Easy	Algorithms	HackerRank	#8	23	Python
101.	Staircase	Easy	Algorithms	HackerRank	#1	1	C++
102.	Plus Minus	Easy	Algorithms	HackerRank	#1	1	C++
103.	Diagonal Difference	Easy	Algorithms	HackerRank	#1	1	C++
104.	Compare the Triplets	Easy	Algorithms	HackerRank	#1	1	C++
105.	Simple Array Sum	Easy	Algorithms	HackerRank	#1	1	C++
106.	Find the Pivot Integer	Easy	Math Prefix Sum	LeetCode	#1	1	Python
107.	Can Make Arithmetic Progression From Sequence	Easy	Array Sorting	LeetCode	#1	1	Python
108.	Sum of All Subset XOR Totals	Easy	Array Math Backtracking Bit Manipulation Combinatorics Enumeration	LeetCode	#1	1	Python
109.	Binary Tree Paths	Easy	String Backtracking Tree Depth-First Search Binary Tree	LeetCode	#1	1	Python
110.	Binary Watch	Easy	Backtracking Bit Manipulation	LeetCode	#1	1	Python
111.	Letter Combinations of a Phone Number	Medium	Hash Table String Backtracking	LeetCode	#2	3	Python
112.	Valid Palindrome II	Easy	Two Pointers String Greedy	LeetCode	#2	2	Python
113.	Three Consecutive Odds	Easy	Array	LeetCode	#2	11	Python
114.	Sort the Jumbled Numbers	Medium	Array Sorting	LeetCode	#3	2	Python
115.	Sort Array by Increasing Frequency	Easy	Array Hash Table Sorting	LeetCode	#1	1	Python
116.	Count Good Numbers	Medium	Math Recursion	LeetCode	#2	6	Python
117.	Pow(x, n)	Medium	Math Recursion	LeetCode	#4	19	Python
118.	Find Kth Bit in Nth Binary String	Medium	String Recursion Simulation	LeetCode	#1	1	Python
119.	Power of Three	Easy	Math Recursion	LeetCode	#1	1	Python
120.	Power of Four	Easy	Math Bit Manipulation Recursion	LeetCode	#2	3	Python
121.	Decode String	Medium	String Stack Recursion	LeetCode	#3	29	Python
122.	Find Consecutive Integers from a Data Stream	Medium	Hash Table Design Queue Counting Data Stream	LeetCode	#2	1	Python
123.	Score of Parentheses	Medium	String Stack Bracket Sequences	LeetCode	#1	1	Python
124.	Number of Recent Calls	Easy	Design Queue Data Stream	LeetCode	#1	1	Python
125.	LRU Cache	Medium	Hash Table Linked List Design Doubly-Linked List	LeetCode	#2	2	Python
126.	Crawler Log Folder	Easy	Array String Stack	LeetCode	#2	1	Python
127.	Removing Stars From a String	Medium	String Stack Simulation	LeetCode	#1	1	Python
128.	Non-decreasing Array	Medium	Array	LeetCode	#3	1	Python
129.	Partition Array According to Given Pivot	Medium	Array Two Pointers Simulation	LeetCode	#1	1	Python
130.	Escape The Ghosts	Medium	Array Math	LeetCode	#2	1	Python
131.	Minimum Number of Operations to Move All Balls to Each Box	Medium	Array String Prefix Sum	LeetCode	#1	1	Python
132.	Card Flipping Game	Medium	Array Hash Table	LeetCode	#4	53	Python
133.	Copy List with Random Pointer	Medium	Hash Table Linked List	LeetCode	#4	17	Python
134.	Design Browser History	Medium	Array Linked List Stack Design Doubly-Linked List Data Stream	LeetCode	#1	1	Python
135.	Swapping Nodes in a Linked List	Medium	Linked List Two Pointers	LeetCode	#1	1	Python
136.	Add Two Numbers II	Medium	Linked List Math Stack	LeetCode	#2	1	Python
137.	Remove Duplicates from Sorted List II	Medium	Linked List Two Pointers	LeetCode	#1	1	Python
138.	Linked List Cycle	Easy	Hash Table Linked List Two Pointers Floyd's Cycle Finding Algorithm	LeetCode	#2	1	Python
139.	Remove Duplicates from Sorted List	Easy	Linked List	LeetCode	#1	1	Python
140.	Reverse Nodes in k-Group	Hard	Linked List Recursion	LeetCode	#2	1	Python
141.	Rotate List	Medium	Linked List Two Pointers	LeetCode	#3	14	Python
142.	Insertion Sort List	Medium	Linked List Sorting	LeetCode	#1	1	Python
143.	Remove Nth Node From End of List	Medium	Linked List Two Pointers	LeetCode	#3	8	Python
144.	Linked List Cycle II	Medium	Hash Table Linked List Two Pointers Floyd's Cycle Finding Algorithm	LeetCode	#1	1	Python
145.	Partition List	Medium	Linked List Two Pointers	LeetCode	#3	1	Python
146.	Reverse Linked List II	Medium	Linked List	LeetCode	#2	35	Python
147.	Merge Two Sorted Lists	Easy	Linked List Recursion	LeetCode	#4	4	Python
148.	Delete Node in a Linked List	Medium	Linked List	LeetCode	#2	8	Python
149.	Reverse Linked List	Easy	Linked List Recursion	LeetCode	#1	1	Python
150.	Design Linked List	Medium	Linked List Design	LeetCode	#3	8	Python
151.	Corporate Flight Bookings	Medium	Array Prefix Sum	LeetCode	#1	1	Python
152.	Subarray Sum Equals K	Medium	Array Hash Table Prefix Sum	LeetCode	#1	1	Python
153.	Fruit Into Baskets	Medium	Array Hash Table Sliding Window	LeetCode	#3	4	Python
154.	Split Two Strings to Make Palindrome	Medium	Two Pointers String	LeetCode	#3	7	Python
155.	Interval List Intersections	Medium	Array Two Pointers Sweep Line	LeetCode	#1	1	Python
156.	Partition Labels	Medium	Hash Table Two Pointers String Greedy	LeetCode	#1	1	Python
157.	Find the Student that Will Replace the Chalk	Medium	Array Binary Search Simulation Prefix Sum	LeetCode	#1	1	Python
158.	Subarray Product Less Than K	Medium	Array Binary Search Sliding Window Prefix Sum	LeetCode	#3	24	Python
159.	Longest Subarray of 1's After Deleting One Element	Medium	Array Dynamic Programming Sliding Window	LeetCode	#1	1	Python
160.	Shifting Letters	Medium	Array String Prefix Sum	LeetCode	#1	1	Python
161.	Find Pivot Index	Easy	Array Prefix Sum	LeetCode	#2	8	Python
162.	Range Sum Query - Immutable	Easy	Array Design Prefix Sum	LeetCode	#1	1	Python
163.	Next Permutation	Medium	Array Two Pointers	LeetCode	#2	1	Python
164.	4Sum	Medium	Array Two Pointers Sorting	LeetCode	#2	1	Python
165.	3Sum	Medium	Array Two Pointers Sorting	LeetCode	#5	35	Python
166.	Longest Mountain in Array	Medium	Array Two Pointers Dynamic Programming Enumeration	LeetCode	#6	39	Python
167.	Longest Substring Of All Vowels in Order	Medium	String Sliding Window	LeetCode	#1	1	Python
168.	Minimum Size Subarray Sum	Medium	Array Binary Search Sliding Window Prefix Sum	LeetCode	#1	1	Python
169.	Longest Substring Without Repeating Characters	Medium	Hash Table String Sliding Window	LeetCode	#9	24	Python
170.	Find All Anagrams in a String	Medium	Hash Table String Sliding Window	LeetCode	#3	2	Python
171.	Maximum Average Subarray I	Easy	Array Sliding Window	LeetCode	#1	1	Python
172.	Search Insert Position	Easy	Array Binary Search	LeetCode	#4	1	Python
173.	Find Smallest Letter Greater Than Target	Easy	Array Binary Search	LeetCode	#1	1	Python
174.	Guess Number Higher or Lower	Easy	Binary Search Interactive	LeetCode	#1	1	Python
175.	Sqrt(x)	Easy	Math Binary Search Newton's Method	LeetCode	#1	1	Python
176.	Two Sum II - Input Array Is Sorted	Medium	Array Two Pointers Binary Search	LeetCode	#2	1	Python
177.	Maximum Matching of Players With Trainers	Medium	Array Two Pointers Greedy Sorting	LeetCode	#1	1	Python
178.	Find Indices With Index and Value Difference II	Medium	Array Two Pointers	LeetCode	#2	1	Python
179.	String Compression	Medium	Two Pointers String	LeetCode	#1	1	Python
180.	Boats to Save People	Medium	Array Two Pointers Greedy Sorting Timsort	LeetCode	#3	3	Python
181.	Find the Duplicate Number	Medium	Array Two Pointers Binary Search Bit Manipulation Pigeonhole Principle Floyd's Cycle Finding Algorithm	LeetCode	#1	1	Python
182.	Count Number of Distinct Integers After Reverse Operations	Medium	Array Hash Table Math Counting	LeetCode	#1	1	Python
183.	Remove Duplicates from Sorted Array II	Medium	Array Two Pointers	LeetCode	#1	1	Python
184.	Divide Players Into Teams of Equal Skill	Medium	Array Hash Table Two Pointers Sorting	LeetCode	#1	1	Python
185.	Container With Most Water	Medium	Array Two Pointers Greedy	LeetCode	#1	1	Python
186.	Sum of Square Numbers	Medium	Math Two Pointers Binary Search	LeetCode	#2	1	Python
187.	Majority Element II	Medium	Array Hash Table Sorting Counting Boyer–Moore Majority Vote Algorithm	LeetCode	#1	1	Python
188.	Design Authentication Manager	Medium	Hash Table Linked List Design Doubly-Linked List	LeetCode	#1	1	Python
189.	Design Underground System	Medium	Hash Table String Design	LeetCode	#1	1	Python
190.	Watering Plants	Medium	Array Simulation	LeetCode	#1	1	Python
191.	Largest Perimeter Triangle	Easy	Array Math Greedy Sorting Quicksort Polygons	LeetCode	#2	1	Python
192.	Keyboard Row	Easy	Array Hash Table String	LeetCode	#2	4	Python
193.	Minimum Index Sum of Two Lists	Easy	Array Hash Table String	LeetCode	#2	7	Python
194.	Widest Vertical Area Between Two Points Containing No Points	Easy	Array Sorting	LeetCode	#1	1	Python
195.	Smallest Value of the Rearranged Number	Medium	Math Sorting	LeetCode	#4	7	Python
196.	Minimum Processing Time	Medium	Array Greedy Sorting	LeetCode	#1	1	Python
197.	Backspace String Compare	Easy	Two Pointers String Stack Simulation	LeetCode	#1	1	Python
198.	Find Greatest Common Divisor of Array	Easy	Array Math Number Theory Euclidean Algorithm Greatest Common Divisor	LeetCode	#1	1	Python
199.	Reduction Operations to Make the Array Elements Equal	Medium	Array Sorting	LeetCode	#1	1	Python
200.	Relative Sort Array	Easy	Array Hash Table Sorting Counting Sort Quicksort Bubble Sort	LeetCode	#1	1	Python
201.	Return Length of Arguments Passed	Easy	Implementation	LeetCode	#1	1	JavaScript
202.	Sort the People	Easy	Array Hash Table String Sorting	LeetCode	#2	27	Python
203.	Diagonal Traverse	Medium	Array Matrix Simulation	LeetCode	#3	10	Python
204.	Maximum Sum of an Hourglass	Medium	Array Matrix Prefix Sum	LeetCode	#1	1	Python
205.	Image Smoother	Easy	Array Matrix	LeetCode	#1	1	Python
206.	Plus One	Easy	Array Math	LeetCode	#1	1	Python
207.	Delete Columns to Make Sorted	Easy	Array String Longest Increasing Subsequence	LeetCode	#1	1	Python
208.	All Divisions With the Highest Score of a Binary Array	Medium	Array	LeetCode	#1	1	Python
209.	Transpose Matrix	Easy	Array Matrix Simulation	LeetCode	#1	1	Python
210.	Find the Winner of the Circular Game	Medium	Array Math Recursion Queue Simulation	LeetCode	#1	1	Python
211.	Reverse String	Easy	Two Pointers String	LeetCode	#1	1	Python
212.	Apply Operations to an Array	Easy	Array Two Pointers Simulation	LeetCode	#1	1	Python
213.	Find Players With Zero or One Losses	Medium	Array Hash Table Sorting Counting	LeetCode	#2	2	Python
214.	Insert Delete GetRandom O(1)	Medium	Array Hash Table Math Design Randomized	LeetCode	#1	1	Python
215.	Frequency Tracker	Medium	Hash Table Design	LeetCode	#4	31	Python
216.	Rearrange Array Elements by Sign	Medium	Array Two Pointers Simulation	LeetCode	#1	1	Python
217.	Decrypt String from Alphabet to Integer Mapping	Easy	String	LeetCode	#2	18	Python
218.	Self Dividing Numbers	Easy	Math	LeetCode	#1	1	Python
219.	Count Primes	Medium	Array Math Enumeration Number Theory Primality Test Sieve Theory Prime Number Sieve	LeetCode	#1	1	Python
220.	Final Value of Variable After Performing Operations	Easy	Array String Simulation	LeetCode	#2	2	Python
221.	Daily Temperatures	Medium	Array Stack Monotonic Stack	LeetCode	#7	34	C++
222.	Average Salary Excluding the Minimum and Maximum Salary	Easy	Array Sorting	LeetCode	#5	10	C++
223.	Two Sum	Easy	Array Hash Table	LeetCode	#4	29	C++