Aaj ka Code

🚀 DSA, GFG POTD & coding interview prep with intuition-first explanations. Learn to think, optimize & solve problems. Code se zyada, Soch Samjho! 💻

[Aaj ka Code @AajKaCode]

🚀 Solved today's GFG POTD: Count Pairs Divisible By K

💡 Trick:
Forget the numbers.

Just count the frequency of every remainder and pair complementary remainders.

🎥https://t.co/9dHN0ZaBMx

#GFGPOTD #Hashing #Math #AajKaCode

[Aaj ka Code @AajKaCode]

🚀 Solved today's GFG POTD: Towers Reaching Both Stations

💡 Trick:
Don't start DFS from every tower.

Start from both stations and traverse in reverse.

🎥 https://t.co/8IpFQZawVj

#GFGPOTD #DFS #Graphs #AajKaCode

[Aaj ka Code @AajKaCode]

🚀 Solved today's GFG POTD: Largest Unblocked Submatrix

💡 Trick:
Ignore the matrix.

Find the largest gap between blocked rows and blocked columns, then multiply them.

🎥 https://t.co/zVR1W6vgkL

#GFGPOTD #Sorting #Arrays #AajKaCode

[Aaj ka Code @AajKaCode]

🚀 Solved today's GFG POTD: Max Sum Path in Two Arrays

💡 Trick:
At every common element, choose the path with the larger accumulated sum.

🎥 https://t.co/2p2FZfmf8J

#GFGPOTD #Greedy #TwoPointers #AajKaCode

[Aaj ka Code @AajKaCode]

🚀 GFG POTD: Max Gap Between Two Same

💡 One observation:
First occurrence is all you need!

🎥 https://t.co/hiELm85TKR

#GFGPOTD #AajKaCode

[Aaj ka Code @AajKaCode]

🚀 Solved today's GFG POTD: Substrings with More 1's than 0's

💡 Key Observation:
Convert

1 → +1
0 → -1

Then use Prefix Sum + HashMap to count all valid substrings in O(N).

🎥 Watch here: https://t.co/LlEhqTvQzE

#GFGPOTD #PrefixSum #HashMap #AajKaCode

[Aaj ka Code @AajKaCode]

🚀 Solved today's GFG POTD: Ways to Increase LCS by One

💡 Key Observation:
Split the answer into:
➡️ Prefix LCS
➡️ Inserted Character
➡️ Suffix LCS

This avoids recomputing LCS for every insertion.

🎥 Watch here: https://t.co/SrF0KdkNGc

#GFGPOTD #LCS #DP #AajKaCode

[Aaj ka Code @AajKaCode]

🚀 Solved today's GFG POTD: Check Subset Sum Divisible by K

💡 Key Observation:
Never store the complete sum.
Store only:

➡️ Sum % K

This reduces the DP state space from exponential to O(N × K).

🎥 Watch here: https://t.co/q8ZWm3J4xL

#GFGPOTD #DP #Modulo #AajKaCode

[Aaj ka Code @AajKaCode]

🚀 Solved today's GFG POTD: Max Subarray Sum by Removing At Most One

💡 Key Idea:
Delete one element and combine:
➡️ Best Left Subarray
➡️ Best Right Subarray

🎥 Watch here: https://t.co/2Zxqnsvey8

#GFGPOTD #Kadane #AajKaCode

[Aaj ka Code @AajKaCode]

🚀 Solved today's GFG POTD: Minimum Insert and Delete to Convert

💡 The key observation:
Since array b is sorted and distinct, the problem transforms from LCS to LIS!

Complexity:
O(N×M) ➜ O(N log N)

🎥 Watch here: https://t.co/JwrOOWlZZr

#GFGPOTD #LIS #DSA #AajKaCode

[Aaj ka Code @AajKaCode]

🚀 Solved today's GFG POTD: k Times Appearing Adjacent Two 1's

The key DP insight:
👉 The current decision depends on the previous bit.

State:
dp[i][prev][k]

🎥 Watch here: https://t.co/q17oUFeeO3

#GFGPOTD #DP #BinaryStrings #AajKaCode

[Aaj ka Code @AajKaCode]

🚀 Solved today's GFG POTD: Ways to Tile the Floor

💡 Just 2 choices lead to the DP recurrence:
➡️ Horizontal tile
➡️ m Vertical tiles
dp[n] = dp[n−1] + dp[n−m]

🎥Watch here: https://t.co/awBwfdxOpn

#AajKaCode #GFGPOTD #DP

[Aaj ka Code @AajKaCode]

🚀 Solved today's GFG POTD: Count Matching Subsequences

Learn the Take/Not Take intuition and how Memoization optimizes the solution from exponential recursion to O(N × M).

🎥 Watch here: [https://t.co/7X4GxK5yIj]

#GFGPOTD #GeeksforGeeks #DP #DSA #CP #AajKaCode

[Aaj ka Code @AajKaCode]

🌟 Day 60/60 – Geekstreak Solved: Flip to Maximize 1s

#geekstreak60 #npci #GfG #POTD #DSA #100DaysOfCode

@geeksforgeeks

@NPCI_NPCI

[Aaj ka Code @AajKaCode]

🌟 Day 59/60 – Geekstreak Solved: Anagram Palindrome

#geekstreak60 #npci #GfG #POTD #DSA #100DaysOfCode

@geeksforgeeks

@NPCI_NPCI

[Aaj ka Code @AajKaCode]

🌟 Day 58/60 – Geekstreak Solved: Implement Atoi

#geekstreak60 #npci #GfG #POTD #DSA #100DaysOfCode

@geeksforgeeks

@NPCI_NPCI

[Aaj ka Code @AajKaCode]

🌟 Day 57/60 – Geekstreak Solved: URLify a given string

#geekstreak60 #npci #GfG #POTD #DSA #100DaysOfCode

@geeksforgeeks

@NPCI_NPCI

[Aaj ka Code @AajKaCode]

🌟 Day 56/60 – Geekstreak Solved: Remove Spaces

#geekstreak60 #npci #GfG #POTD #DSA #100DaysOfCode

@geeksforgeeks

@NPCI_NPCI

[Aaj ka Code @AajKaCode]

🌟 Day 55/60 – Geekstreak Solved: Next Smallest Palindrome

#geekstreak60 #npci #GfG #POTD #DSA #100DaysOfCode

@geeksforgeeks

@NPCI_NPCI

[Aaj ka Code @AajKaCode]

🌟 Day 54/60 – Geekstreak Solved: Toeplitz matrix

#geekstreak60 #npci #GfG #POTD #DSA #100DaysOfCode

@geeksforgeeks

@NPCI_NPCI