Q-10 PepCoding | Longest Substring With Non Repeating Characters

PHOTO

Tue Jan 24 2023 13:42:58 GMT+0000 (Coordinated Universal Time)

Saved by @Ayush_dabas07

class Solution {
    public int lengthOfLongestSubstring(String s) {
        
        //2 HM to keep track of characters & answer string
        HashMap<Character,Integer> map1 = new HashMap<>();
        
        int ans = 0 ;

        //pointers to keep track of window
        int i = 0 , j = 0;


        //acquiring and releasing while traversing the array
        for(i = 0 ; i< s.length(); i++){
            //storing in map and updating ccc
            char ch = s.charAt(i);
            map1.put(ch,map1.getOrDefault(ch,0)+1);

            //now that we have valid substring we will store this and check for smaller
            //substring by removing character from behind one by one
            while(map1.get(ch)==2){
                
                //removing character & updating ccc
                char temp = s.charAt(j);
                
                //updating ccc

                if(map1.get(temp) == 1)
                map1.remove(temp);
                else
                map1.put(temp , map1.get(temp)-1);

                j++;
            }
            String pans = s.substring(j , i+1);
            System.out.println(pans);

            ans = Math.max(ans , pans.length());
        }

        return ans;
    }
}

https://www.pepcoding.com/resources/data-structures-and-algorithms-in-java-levelup/hashmap-and-heaps/longest-substring-with-unique-characters-official/ojquestion

Save snippets that work from anywhere online with our extensions

Available in the Chrome Web Store

Get Firefox Add-on

Get VS Code extension

Comments

More like this

HashMap And Heaps

@Ayush_dabas07

Q64 Snapshot Array - LeetCode Q63 Reorganize String - LeetCode Q62 Tricky Sorting Cost | Practice | GeeksforGeeks Q62 Minimum Cost To Connect Sticks Q60 PepCoding | Longest Substring With At Most Two Distinct Characters Q59 PepCoding | Line Reflection Q58 Pairs of Non Coinciding Points | Practice | GeeksforGeeks Q57 Avoid Flood in The City - LeetCode Q56 Random Pick with Blacklist - LeetCode Q55 Insert Delete GetRandom O(1) - Duplicates allowed - LeetCode Q55 Insert Delete GetRandom O(1) - Duplicates allowed - LeetCode Q54 Insert Delete GetRandom O(1) - LeetCode Q53 The Skyline Problem - LeetCode Q52 Encode and Decode TinyURL - LeetCode Q51 Maximum Frequency Stack - LeetCode Q50 Brick Wall - LeetCode Q50 Brick Wall - LeetCode Q49 X of a Kind in a Deck of Cards - LeetCode Q48 First Unique Character in a String - LeetCode Q47 Subdomain Visit Count - LeetCode Q46 Powerful Integers - LeetCode Q45 4Sum II - LeetCode Q44 PepCoding | Quadruplet Sum QFind K Pairs with Smallest Sums - LeetCode Q43 PepCoding | Pairs With Given Sum In Two Sorted Matrices Q42 Completing tasks | Practice | GeeksforGeeks Q41 Degree of an Array - LeetCode Q-40 Can Make Arithmetic Progression From Sequence - LeetCode Q39 PepCoding | Double Pair Array Q38 Rabbits in Forest - LeetCode Q-37* Fraction to Recurring Decimal - LeetCode Q36 PepCoding | Pairs With Equal Sum Q35 PepCoding | Count Of Subarrays With Equal Number Of 0s 1s And 2s Q34 PepCoding | Longest Subarray With Equal Number Of 0s 1s And 2s Q-34PepCoding | Pairs With Equal Sum Q33 PepCoding | Count Of Subarrays With Equal Number Of Zeroes And Ones Q32 Contiguous Array - LeetCode Q31 Subarray Sums Divisible by K - LeetCode Q30 PepCoding | Longest Subarray With Sum Divisible By K Q29 Subarray Sum Equals K - LeetCode Q27 Word Pattern - LeetCode Q-26 Isomorphic Strings - LeetCode Q-25 PepCoding | Group Shifted String Q24 Group Anagrams - LeetCode Q23 Valid Anagram - LeetCode Q22 PepCoding | Find Anagram Mappings Q21 PepCoding | K Anagrams Q20 Find All Anagrams in a String - LeetCode Q-19 Binary String With Substrings Representing 1 To N - LeetCode Q-18 PepCoding | Count Of Substrings Having At Most K Unique Characters Q-17 PepCoding | Longest Substring With At Most K Unique Characters Q-16 PepCoding | Maximum Consecutive Ones - 2 Q15 PepCoding | Maximum Consecutive Ones - 1 Q-14 PepCoding | Equivalent Subarrays Q13 PepCoding | Count Of Substrings With Exactly K Unique Characters Q-12 PepCoding | Longest Substring With Exactly K Unique Characters Q-11 PepCoding | Count Of Substrings Having All Unique Characters Q-10 PepCoding | Longest Substring With Non Repeating Characters Q-9 PepCoding | Smallest Substring Of A String Containing All Unique Characters Of Itself Q8 PepCoding | Smallest Substring Of A String Containing All Characters Of Another String | leetcode76 Q-7 PepCoding | Largest Subarray With Contiguous Elements Q-6 PepCoding | Count Of All Subarrays With Zero Sum Q5 PepCoding | Largest Subarray With Zero Sum Q4 PepCoding | Count Distinct Elements In Every Window Of Size K Q-3 PepCoding | Check If An Array Can Be Divided Into Pairs Whose Sum Is Divisible By K Q2 PepCoding | Find Itinerary From Tickets Q1 PepCoding | Number Of Employees Under Every Manager 2653. Sliding Subarray Beauty

Browse more snippets >>