QnAPe

QnAPe is a platform to ask questions and connect with people who contribute unique insights and quality answers. Let's learn to lead.

[Ur Next Door @withurnextdoor]

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[QnAPe @QnA_Pe]

SignuponBingXandreceiveanairdrop https://t.co/KjiNwDTdh9

[Mayank @MayankQnAPe]

#pakistan = #roguenation
#pakistani = #terrorist
#isi = #terrorist

#IndiaPakistanWar #IndiaPakistanWar2025

[Mayank @MayankQnAPe]

Can you partition a string into all palindromic substrings?

Example: "aab" ➡️ [["a","a","b"],["aa","b"]]
Use recursion + backtracking to crack this!

#CrackCodingWithMayank #100DaysOfCode #Backtracking #DSA #CodingChallenge #LeetCode #TechTwitter

[Mayank @MayankQnAPe]

Can you restore valid IPs from a string of digits?
E.g. Input: "25525511135"
Output: ["255.255.11.135", "255.255.111.35"]

Rules:
4 parts
0–255 range
No leading 0s
No digit reordering

#CrackCodingWithMayank #CodingChallenge #100DaysOfCode #LeetCode #DevLife #Backtracking #Tech

[Mayank @MayankQnAPe]

💡 Coding Tip:
Next Permutation Problem
Given: [1,2,3]
➡️ Output: [1,3,2]

Rearrange to next lexicographical order in-place with constant space!
Perfect for tech interviews 🔥

#TechTwitter #CodeNewbie #InterviewPrep #LeetCode #DSA #CrackCodingWithMayank

[Mayank @MayankQnAPe]

📌 Given the head of a linked list, delete the node that's n-th from the end, and return the updated head.

Input: [1, 2, 3, 4, 5], n = 2
Output: [1, 2, 3, 5]

#LinkedList #DSA #CodingChallenge #TechInterview #ProblemSolving #CrackCodingWithMayank #100DaysOfCode #DataStructures

[Mayank @MayankQnAPe]

📢 Coding Challenge Alert: Convert Integers to Roman Numerals! 🔢➡️🏛️

#CrackCodingWithMayank #RomanNumerals #CodingChallenge #DailyCoding #ProblemSolving #Algorithms #LeetCode #CodeNewbie #SoftwareEngineering #100DaysOfCode #DevCommunity #BuildInPublic #JavaScript #Python #Tech

[Mayank @MayankQnAPe]

💧Coding Tip: Max Water Container Problem!💧

Input: [1,8,6,2,5,4,8,3,7]
Max Area: 49
✅ Use Two Pointers ✅ Move the pointer with smaller height ✅ Optimize space and time!

#100DaysOfCode #leetcode #TechTwitter #CodingLife

[Mayank @MayankQnAPe]

Zigzag String Conversion 🧵

Write a function to convert a string into zigzag form across rows and read line by line.

Example:
Input: "PAYPALISHIRING", numRows=3
Output: "PAHNAPLSIIGYIR"

#CrackCodingWithMayank #Coding #Cplusplus

[Mayank @MayankQnAPe]

Implemented SummaryRanges for real-time integer streams.

➕ addNum(1) → [[1,1]]
➕ addNum(3) → [[1,1],[3,3]]
➕ addNum(2) → [[1,3]]
➕ addNum(7) → [[1,3],[7,7]]
➕ addNum(6) → [[1,3],[6,7]]
🔥 Efficient merge on-the-fly!
#LeetCode #100DaysOfCode #DevLog #AlgoDaily #Tech

[Mayank @MayankQnAPe]

🧠 Palindrome Pairs
Find all (i, j) where words[i] + words[j] is a palindrome.
📈 Must run in O(sum of word lengths)!
Eg:
Input ➡️["abcd","dcba","lls","s","sssll"]
Output ➡️[[0,1],[1,0],[3,2],[2,4]]

#LeetCode #100DaysOfCode #Palindrome #DevCommunity #CodeNewbie #JavaScript #DSA

[Mayank @MayankQnAPe]

🧠 Can your path cross itself?

Start at (0,0).
Move: North, West, South, East... (repeat ⤴️ counter-clockwise).

Input: distance = [2,1,1,2]
➡️ Output: true (Crosses at (0, 1))

#100DaysOfCode #CodingChallenge #LeetCode #DSA #Algorithms #DevLife #CrackCodingWithMayank

[Mayank @MayankQnAPe]

Itinerary problem!
Reconstruct the path from JFK using all tickets, lex smallest order.
Inp: [["JFK","SFO"],["JFK","ATL"],["SFO","ATL"],["ATL","JFK"],["ATL","SFO"]]
Opt: ["JFK","ATL","JFK","SFO","ATL","SFO"]

#100DaysOfCode #GraphAlgorithms #DevCommunity #JavaScript #MayankCodes

[Mayank @MayankQnAPe]

🧠 Coding Challenge: Given nums = [1,3], n = 6, how many numbers do we need to add so that we can form every sum in [1, 6]?

Answer: 1 ➝ Add 2 🔥

Try more: [1,5,10], n=20 ➝ 2 patches
[1,2,2], n=5 ➝ 0 patches
#Coding #Greedy #TechTwitter

[Mayank @MayankQnAPe]

🧠 Longest Increasing Path in a Matrix:Move only: ⬅️ ➡️ ⬆️ ⬇️ (no diagonal!) Path must be strictly increasing.

Input: [[9,9,4],[6,6,8],[2,1,1]]
Output: 4 ➡️ [1 → 2 → 6 → 9]

#Leetcode #DSA #CodeNewbie #100DaysOfCode

[Mayank @MayankQnAPe]

🚀 DSA Challenge Time!
How many range sums in nums fall within [lower, upper]?
Example:
Input: [-2,5,-1], Range: [-2,2]
✅ Output: 3

Master prefix sums & level up 💪
More at 👉 Crack Coding with Mayank
#100DaysOfCode #DSA #CodingChallenge #CrackCodingWithMayank

[Mayank @MayankQnAPe]

🧠 Can you form the largest number of length k from two arrays of digits?
Keep the order in each array! 🔁
Example:
nums1 = [3,4,6,5]
nums2 = [9,1,2,5,8,3]
k = 5
✅ Output: [9,8,6,5,3]

👨‍💻 Comment your approach ⬇️
#LeetCode #CodingChallenge #100DaysOfCode #DevTwitter

[Mayank @MayankQnAPe]

🚀 Challenge: Count Smaller Numbers After Self

Given nums = [5,2,6,1], return [2,1,1,0].

Efficient solutions? ✅ Merge Sort + BIT, ✅ Balanced BST, ✅ Segment Tree (O(n log n) complexity).

How would you solve it? Drop your approach! 👇
#LeetCode #Coding #DSA #Algorithms #Tech

[Mayank @MayankQnAPe]

💡 Bursting Balloons – DP Challenge! 🎈

Given an array of balloons 🎯, burst them wisely to maximize coins! 💰

🔹 nums = [3,1,5,8]
🔹 Max Coins = 167
👨‍💻 Used Memoization + Interval DP to optimize!

#LeetCode #Coding #DynamicProgramming #InterviewPrep #100DaysOfCode