Daily Coding Practice 🧠

Welcome to my daily coding practice repo!

Here, I solve basic to advanced coding problems from various sources like PrepInsta, LeetCode, GeeksforGeeks, etc.

I solve interesting problems regularly to improve my skills in:

Problem Solving
Data Structures and Algorithms (DSA)
Coding for Interviews
Logical Thinking

Structure

Each Day-X folder contains 1 or more problems solved on that day.
Files are named as Q1, Q2, ... based on the number of questions solved.

📚 What you will find here

✅ Daily coding questions
✅ PrepInsta / LeetCode / GFG / Practice sets
✅ Clean and optimized Python solutions
✅ Simple code explanations

My Goal

To build consistency and strong problem-solving skills! 🚀. "Consistency is the key to mastery. Solving problems daily to strengthen my DSA skills and get better every day."

LeetCode Topics

Array


0001-two-sum
0026-remove-duplicates-from-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0053-maximum-subarray
0074-search-a-2d-matrix
0075-sort-colors
0080-remove-duplicates-from-sorted-array-ii
0088-merge-sorted-array
0121-best-time-to-buy-and-sell-stock
0136-single-number
0167-two-sum-ii-input-array-is-sorted
0215-kth-largest-element-in-an-array
0349-intersection-of-two-arrays
0792-binary-search
0882-peak-index-in-a-mountain-array
0941-sort-array-by-parity
0948-sort-an-array
1482-how-many-numbers-are-smaller-than-the-current-number
1580-shuffle-the-array
1603-running-sum-of-1d-array
1791-richest-customer-wealth

Dynamic Programming


0053-maximum-subarray
0121-best-time-to-buy-and-sell-stock
1013-fibonacci-number

Two Pointers


0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0061-rotate-list
0075-sort-colors
0080-remove-duplicates-from-sorted-array-ii
0088-merge-sorted-array
0125-valid-palindrome
0142-linked-list-cycle-ii
0143-reorder-list
0151-reverse-words-in-a-string
0160-intersection-of-two-linked-lists
0167-two-sum-ii-input-array-is-sorted
0234-palindrome-linked-list
0344-reverse-string
0349-intersection-of-two-arrays
0874-backspace-string-compare
0908-middle-of-the-linked-list
0941-sort-array-by-parity

String


0020-valid-parentheses
0058-length-of-last-word
0125-valid-palindrome
0151-reverse-words-in-a-string
0344-reverse-string
0387-first-unique-character-in-a-string
0412-fizz-buzz
0874-backspace-string-compare

Math


0002-add-two-numbers
0009-palindrome-number
0069-sqrtx
0231-power-of-two
0326-power-of-three
0412-fizz-buzz
1013-fibonacci-number
1406-subtract-the-product-and-sum-of-digits-of-an-integer
1630-count-odd-numbers-in-an-interval-range
2608-count-the-digits-that-divide-a-number

Recursion


0002-add-two-numbers
0021-merge-two-sorted-lists
0143-reorder-list
0206-reverse-linked-list
0231-power-of-two
0234-palindrome-linked-list
0326-power-of-three
1013-fibonacci-number

Memoization


1013-fibonacci-number

Simulation


0412-fizz-buzz
0874-backspace-string-compare

Hash Table


0001-two-sum
0142-linked-list-cycle-ii
0160-intersection-of-two-linked-lists
0349-intersection-of-two-arrays
0387-first-unique-character-in-a-string
1482-how-many-numbers-are-smaller-than-the-current-number

Sorting


0075-sort-colors
0088-merge-sorted-array
0215-kth-largest-element-in-an-array
0349-intersection-of-two-arrays
0941-sort-array-by-parity
0948-sort-an-array
1482-how-many-numbers-are-smaller-than-the-current-number

Counting Sort


0387-first-unique-character-in-a-string
0948-sort-an-array
1482-how-many-numbers-are-smaller-than-the-current-number

Bit Manipulation


0136-single-number
0231-power-of-two

Prefix Sum


1603-running-sum-of-1d-array

Divide and Conquer


0053-maximum-subarray
0215-kth-largest-element-in-an-array
0948-sort-an-array

Matrix


0074-search-a-2d-matrix
1791-richest-customer-wealth

Binary Search


0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0069-sqrtx
0074-search-a-2d-matrix
0167-two-sum-ii-input-array-is-sorted
0349-intersection-of-two-arrays
0792-binary-search
0882-peak-index-in-a-mountain-array

Queue


0225-implement-stack-using-queues
0232-implement-queue-using-stacks
0387-first-unique-character-in-a-string

Heap (Priority Queue)


0215-kth-largest-element-in-an-array
0948-sort-an-array

Merge Sort


0948-sort-an-array

Bucket Sort


0948-sort-an-array

Radix Sort


0948-sort-an-array

Linked List


0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0061-rotate-list
0083-remove-duplicates-from-sorted-list
0142-linked-list-cycle-ii
0143-reorder-list
0160-intersection-of-two-linked-lists
0206-reverse-linked-list
0234-palindrome-linked-list
0237-delete-node-in-a-linked-list
0328-odd-even-linked-list
0908-middle-of-the-linked-list

Stack


0020-valid-parentheses
0143-reorder-list
0144-binary-tree-preorder-traversal
0225-implement-stack-using-queues
0232-implement-queue-using-stacks
0234-palindrome-linked-list
0874-backspace-string-compare

Design


0225-implement-stack-using-queues
0232-implement-queue-using-stacks

Tree


0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0107-binary-tree-level-order-traversal-ii
0144-binary-tree-preorder-traversal
0199-binary-tree-right-side-view
0637-average-of-levels-in-binary-tree
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree

Depth-First Search


0104-maximum-depth-of-binary-tree
0144-binary-tree-preorder-traversal
0199-binary-tree-right-side-view
0637-average-of-levels-in-binary-tree

Binary Tree


0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0107-binary-tree-level-order-traversal-ii
0144-binary-tree-preorder-traversal
0199-binary-tree-right-side-view
0637-average-of-levels-in-binary-tree
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree

Breadth-First Search


0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0107-binary-tree-level-order-traversal-ii
0199-binary-tree-right-side-view
0637-average-of-levels-in-binary-tree

Binary Search Tree


0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree

Quickselect


0215-kth-largest-element-in-an-array

Name		Name	Last commit message	Last commit date
Latest commit History 476 Commits
0001-two-sum		0001-two-sum
0002-add-two-numbers		0002-add-two-numbers
0009-palindrome-number		0009-palindrome-number
0019-remove-nth-node-from-end-of-list		0019-remove-nth-node-from-end-of-list
0020-valid-parentheses		0020-valid-parentheses
0021-merge-two-sorted-lists		0021-merge-two-sorted-lists
0026-remove-duplicates-from-sorted-array		0026-remove-duplicates-from-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array		0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position		0035-search-insert-position
0050-powx-n		0050-powx-n
0053-maximum-subarray		0053-maximum-subarray
0058-length-of-last-word		0058-length-of-last-word
0061-rotate-list		0061-rotate-list
0069-sqrtx		0069-sqrtx
0074-search-a-2d-matrix		0074-search-a-2d-matrix
0075-sort-colors		0075-sort-colors
0080-remove-duplicates-from-sorted-array-ii		0080-remove-duplicates-from-sorted-array-ii
0083-remove-duplicates-from-sorted-list		0083-remove-duplicates-from-sorted-list
0088-merge-sorted-array		0088-merge-sorted-array
0102-binary-tree-level-order-traversal		0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal		0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree		0104-maximum-depth-of-binary-tree
0107-binary-tree-level-order-traversal-ii		0107-binary-tree-level-order-traversal-ii
0121-best-time-to-buy-and-sell-stock		0121-best-time-to-buy-and-sell-stock
0125-valid-palindrome		0125-valid-palindrome
0136-single-number		0136-single-number
0142-linked-list-cycle-ii		0142-linked-list-cycle-ii
0143-reorder-list		0143-reorder-list
0144-binary-tree-preorder-traversal		0144-binary-tree-preorder-traversal
0151-reverse-words-in-a-string		0151-reverse-words-in-a-string
0160-intersection-of-two-linked-lists		0160-intersection-of-two-linked-lists
0167-two-sum-ii-input-array-is-sorted		0167-two-sum-ii-input-array-is-sorted
0199-binary-tree-right-side-view		0199-binary-tree-right-side-view
0206-reverse-linked-list		0206-reverse-linked-list
0215-kth-largest-element-in-an-array		0215-kth-largest-element-in-an-array
0225-implement-stack-using-queues		0225-implement-stack-using-queues
0231-power-of-two		0231-power-of-two
0232-implement-queue-using-stacks		0232-implement-queue-using-stacks
0234-palindrome-linked-list		0234-palindrome-linked-list
0237-delete-node-in-a-linked-list		0237-delete-node-in-a-linked-list
0326-power-of-three		0326-power-of-three
0328-odd-even-linked-list		0328-odd-even-linked-list
0344-reverse-string		0344-reverse-string
0349-intersection-of-two-arrays		0349-intersection-of-two-arrays
0387-first-unique-character-in-a-string		0387-first-unique-character-in-a-string
0412-fizz-buzz		0412-fizz-buzz
0637-average-of-levels-in-binary-tree		0637-average-of-levels-in-binary-tree
0783-search-in-a-binary-search-tree		0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree		0784-insert-into-a-binary-search-tree
0792-binary-search		0792-binary-search
0874-backspace-string-compare		0874-backspace-string-compare
0882-peak-index-in-a-mountain-array		0882-peak-index-in-a-mountain-array
0908-middle-of-the-linked-list		0908-middle-of-the-linked-list
0941-sort-array-by-parity		0941-sort-array-by-parity
0948-sort-an-array		0948-sort-an-array
1013-fibonacci-number		1013-fibonacci-number
1406-subtract-the-product-and-sum-of-digits-of-an-integer		1406-subtract-the-product-and-sum-of-digits-of-an-integer
1482-how-many-numbers-are-smaller-than-the-current-number		1482-how-many-numbers-are-smaller-than-the-current-number
1528-kids-with-the-greatest-number-of-candies		1528-kids-with-the-greatest-number-of-candies
1580-shuffle-the-array		1580-shuffle-the-array
1603-running-sum-of-1d-array		1603-running-sum-of-1d-array
1630-count-odd-numbers-in-an-interval-range		1630-count-odd-numbers-in-an-interval-range
1791-richest-customer-wealth		1791-richest-customer-wealth
2608-count-the-digits-that-divide-a-number		2608-count-the-digits-that-divide-a-number
3194-find-words-containing-character		3194-find-words-containing-character
Difficulty: Basic		Difficulty: Basic
Difficulty: Easy		Difficulty: Easy
Difficulty: Medium/Kth Smallest		Difficulty: Medium/Kth Smallest
Occurrence of Digit.py		Occurrence of Digit.py
Abundant Number.py		Abundant Number.py
Add of 2 factors.py		Add of 2 factors.py
Adjacency List and Adjacency Matrix.py		Adjacency List and Adjacency Matrix.py
Arrange 1st half in ascending and 2nd half in decending of an array.py		Arrange 1st half in ascending and 2nd half in decending of an array.py
Automorphic Numbers.py		Automorphic Numbers.py
Binary To Decimal.py		Binary To Decimal.py
Coordinate lie.py		Coordinate lie.py
Count of vowels in input .py		Count of vowels in input .py
Counting Distinct Elements in an Array.py		Counting Distinct Elements in an Array.py
Days in a month.py		Days in a month.py
Defanging an IP Address.py		Defanging an IP Address.py
Digits in int input.py		Digits in int input.py
Final Value of Variable After Performing Operations.py		Final Value of Variable After Performing Operations.py
Finding Repeating elements in an Array .py		Finding Repeating elements in an Array .py
Frequency of element in an array .py		Frequency of element in an array .py
Friendly Pair .py		Friendly Pair .py
GDC.py		GDC.py
HCF.py		HCF.py
Harshad Number .py		Harshad Number .py
HashMap (Dictionary).py		HashMap (Dictionary).py
LCM.py		LCM.py
Largest element in an array .py		Largest element in an array .py
Last Second in an array .py		Last Second in an array .py
Leap year.py		Leap year.py
Linked-List implementation of Queue.py		Linked-List implementation of Queue.py
Linked-List implimentation of stack.py		Linked-List implimentation of stack.py
List implementation of queue.py		List implementation of queue.py
Longest palindrome in an array .py		Longest palindrome in an array .py
Max Handshakes.py		Max Handshakes.py
MaxHeap(manually).py		MaxHeap(manually).py
MinHeap(manually).py		MinHeap(manually).py

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