Two Strings Are Close? | The Sorted-Frequency Trick | LeetCode 75 #22

Determine if Two Strings Are Close — LeetCode 1657 (LeetCode 75 #22) explained in Hindi, from zero. Two strings are "close" if you can turn one into the other using just two operations: swap any two characters, or transform ALL occurrences of one character into another (and vice versa). The trick: forget the order, count the inventory. If both strings have the SAME letter set and the SAME sorted frequency pattern, they are close. O(n) time, O(1) space. In this video: why simulating operations is exponential and fails, both operations animated on real letters, the letter-blocks analogy, the two checks with counterexamples that pass one check but fail the other, a full C++ walkthrough (why every line exists, what breaks without it), a plain-words correctness proof, edge cases, common interview mistakes, and follow-up questions. Problem: https://leetcode.com/problems/determi... Chapters: 00:00 Introduction and examples 03:09 Why brute force fails 05:32 The two operations (animated) 10:06 The core idea: forget order, count inventory 14:30 Full dry run with bar charts 19:26 C++ code walkthrough (WHY-first) 25:43 Edge cases 28:04 Common mistakes and interview follow-ups 30:10 Correctness proof in plain words 33:28 Recap #LeetCode75 #LeetCode #DSA #HindiCoding #Placements #CodingInterview #CPP #Strings