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Tag: coding interview

#189 Rotate Array

Posted on January 17, 2022September 19, 2023 By thecodepathshala 3 Comments on #189 Rotate Array

Given an array, rotate the array to the right by k steps, where k is non-negative. Example 1: Input: nums = [1,2,3,4,5,6,7], k = 3 Output: [5,6,7,1,2,3,4] Explanation: rotate 1 steps to the right: [7,1,2,3,4,5,6] rotate 2 steps to the right: [6,7,1,2,3,4,5] rotate 3 steps to the right: [5,6,7,1,2,3,4] Example 2: Input: nums = [-1,-100,3,99], k = 2 Output:…

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Algo, Competitive Programming, DS & Algo, Leetcode Problems

GFG : Cyclically rotate an array by one

Posted on January 16, 2022September 19, 2023 By thecodepathshala 6 Comments on GFG : Cyclically rotate an array by one

Given an array, rotate the array by one position in clock-wise direction.  Example 1: Input: N = 5 A[] = {1, 2, 3, 4, 5} Output: 5 1 2 3 4 Example 2: Input: N = 8 A[] = {9, 8, 7, 6, 4, 2, 1, 3} Output: 3 9 8 7 6 4 2 1 Your…

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Algo, Competitive Programming, DS & Algo, GFG

#4 Median of Two Sorted Arrays

Posted on January 15, 2022June 25, 2023 By thecodepathshala No Comments on #4 Median of Two Sorted Arrays

Given two sorted arrays nums1 and nums2 of size m and n respectively, return the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). Example 1: Input: nums1 = [1,3], nums2 = [2] Output: 2.00000 Explanation: merged array = [1,2,3] and median is 2. Example 2: Input: nums1 = [1,2], nums2 = [3,4] Output: 2.50000 Explanation: merged array = [1,2,3,4]…

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Algo, Competitive Programming, DS & Algo, Leetcode Problems

#2 Add Two Numbers

Posted on January 15, 2022September 19, 2023 By thecodepathshala No Comments on #2 Add Two Numbers

You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order, and each of their nodes contains a single digit. Add the two numbers and return the sum as a linked list. You may assume the two numbers do not contain any leading zero, except the number 0 itself. Example 1: Input:…

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Algo, Competitive Programming, DS & Algo, Leetcode Problems

#1 Two Sum

Posted on January 14, 2022September 19, 2023 By thecodepathshala 1 Comment on #1 Two Sum

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target. You may assume that each input would have exactly one solution, and you may not use the same element twice. You can return the answer in any order. Example 1: Input: nums = [2,7,11,15], target = 9 Output: [0,1] Explanation: Because…

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Algo, Competitive Programming, DS & Algo, Leetcode Problems

#349 Intersection of Two Arrays

Posted on January 14, 2022January 14, 2022 By thecodepathshala No Comments on #349 Intersection of Two Arrays

Given two integer arrays nums1 and nums2, return an array of their intersection. Each element in the result must be unique and you may return the result in any order. Example 1: Input: nums1 = [1,2,2,1], nums2 = [2,2] Output: [2] Example 2: Input: nums1 = [4,9,5], nums2 = [9,4,9,8,4] Output: [9,4] Explanation: [4,9] is also accepted. Constraints: 1 <= nums1.length, nums2.length…

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🔥 C++ STL IN 30 MINUTES — Complete Introduction for DSA & Coding Interviews!

Confused about C++ STL while solving DSA and LeetCode problems? In this video, we’ll understand the Standard Template Library (STL) from scratch and learn the most important concepts you actually need for competitive programming, DSA, placements and coding interviews.

Instead of spending hours learning STL, this 30-minute C++ STL crash course gives you a practical overview of the most important STL components with examples and complexity.

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✅ sort()
✅ reverse()
✅ find()
✅ binary_search()
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🔥 DSA Placements
🔥 Competitive Programming
🔥 Amazon / Microsoft / Google / Meta Interviews
🔥 C++ Programming

then knowing STL can significantly reduce the amount of code you need to write and help you focus on the actual problem-solving logic.

By the end of this video, you should have a clear roadmap of which C++ STL containers, functions and algorithms you need to learn for DSA.

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Important!!
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🚀 LeetCode #1 – Two Sum Explained in Under 2 Minutes!
Learn the most asked coding interview problem using the Hash Map approach and understand why it runs in O(n) time instead of O(n²).
In this Short, you'll learn:
✅ Problem statement
✅ Optimized Hash Map approach
✅ Step-by-step dry run
✅ Time & Space Complexity
✅ Interview tips
If you're preparing for FAANG, Microsoft, Amazon, Google, or any software engineering interview, this series is for you.
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