Lexicographically Largest String After Deleting K Characters | GfG POTD | 24-06-2025 | GeeksforGeeks

Today’s GfG POTD: Lexicographically Largest String After Deleting K Characters
Problem link → https://www.geeksforgeeks.org/problems/lexicographically-largest-string-after-deleting-k-characters/1
Code → https://github.com/imnilesh18/GfG-POTD/blob/master/06_June/24_Lexicographically%20Largest%20String%20After%20Deleting%20K%20Characters.cpp

⏱ Video Chapters
00:00 Introduction
00:28 Problem Statement Understanding
02:41 Greedy Stack-Based Approach
03:57 Full Dry Run on “cadbzf”, k=2
09:25 Edge case dry Run on “zrptllivngoi”, k=11
14:19 Code

🔑 Keywords:
Lexicographically Largest String, Delete K Characters, Greedy Algorithm, Stack Technique, GfG POTD, C++ Tutorial, Java Tutorial, LeetGeek, GeekStreak2025, POTDwithGFG, Coding Interview Prep, Competitive Programming, Algorithm Design, Daily Coding Challenge, String Manipulation, Data Structures, Problem Solving, Code Walkthrough, Dry Run, Time Complexity, Space Complexity

🧾 Problem Statement
Given a string s of lowercase English letters and an integer k, remove exactly k characters so that the resulting string is lexicographically largest possible, while preserving the relative order of the remaining characters.

📊 Example Inputs & Outputs
• Input: s = “ritz”, k = 2 → Output: “tz”
All possible deletions: “ri”, “rt”, “rz”, “it”, “iz”, “tz” → “tz” is largest.
• Input: s = “zebra”, k = 3 → Output: “zr”
Remove “e”, “b”, “a” → “zr”.
• Input: s = “cadbzf”, k = 2 → Output: “dbzf”

🧠 What You’ll Learn
• Greedy Stack-Based Method: How to decide which character to pop for maximum lexicographical gain.
• Handling Removals: Trimming the tail when the string never “dips.”
• Edge Cases: All equal chars, k = 0, k = n-1.
• Full Dry Runs: Step-by-step on multiple testcases.
• Code Tours: Line-by-line breakdown of both C++ and Java solutions.
• Complexity Analysis: Why it’s O(n) time and O(n) space.

📂 Resources & Code
• GfG POTD Problem: https://www.geeksforgeeks.org/problems/lexicographically-largest-string-after-deleting-k-characters/1
• GitHub Repo (C++ & Java): https://github.com/imnilesh18/GfG-POTD/blob/master/06_June/24_Lexicographically%20Largest%20String%20After%20Deleting%20K%20Characters.cpp
• Full GfG-POTD Collection: https://github.com/imnilesh18/GfG-POTD

🚀 Why Watch?
• Clear, no-fluff diagrams & dry runs.
• Clean, production-ready code explanations.
• Perfect for your GfG streak, coding interviews, and competitive programming prep.

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🔖 Tags
LexicographicallyLargestString, DeleteKCharacters, GreedyStack, StackAlgorithm, StringManipulation, GFGPOTD, GeeksforGeeks, CPlusPlus, Java, LeetGeek, GeekStreak2025, POTDwithGFG, DailyCodingChallenge, CompetitiveProgramming, CodingInterview, AlgorithmDesign, DataStructures, ProblemSolving, CodeWalkthrough, DryRun, TimeComplexity, SpaceComplexity, EdgeCases, StringAlgorithms, ProgrammingTutorial, SoftwareEngineering, ComputerScience, TechEducation, CodeImplementation, YouTubeTutorial, EducationalContent, InterviewPrep, PracticeCoding, AlgoTutorial, SequenceAlgorithms, GreedyTechnique, RemovalAlgorithm, LexicoOrder, TutorialSeries, CodingCommunity, StudyWithMe, BigOAnalysis, CodeExplanation, StackBasedSolution, CleanCode, ProductionReadyCode, LearningDSA, GfGSeries, RSolution, Javasolution, SDEInterview, TechInterview, @geeksforgeeks, #gfg160, #POTDwithGFG, #geekstreak2025

Видео Lexicographically Largest String After Deleting K Characters | GfG POTD | 24-06-2025 | GeeksforGeeks канала LeetGeek