Q30 PepCoding | Longest Subarray With Sum Divisible By K

PHOTO

Thu Jan 26 2023 20:11:21 GMT+0000 (Coordinated Universal Time)

Saved by @Ayush_dabas07

import java.util.*;

public class Main {

    public static int solution(int[] arr, int k) {
//make hashmap<PSA,Index> and keep storing PSA , if (PSA - k) exists and is divisible by k store length of i - index of (psa-k)


        
        HashMap<Integer, Integer> map = new HashMap<>();
        int psa = 0 , ans = 0 ;
        map.put(0 , -1);
        
        for(int i =0 ;i < arr.length ; i++){
            int val = arr[i];
            psa += val;
            
            //find remainder
            int rem = psa%k;
            
            //if remainder comes out to be -ve add k
            if(rem < 0) rem += k;
            
            if(map.containsKey(rem))
                ans = Math.max(ans , i - map.get(rem));
            
            else
                map.put(rem , i);
            
        }

        return ans;
    }
    
    public static void main(String[] args) {
        Scanner scn = new Scanner(System.in);
        int n = scn.nextInt();
        int[] arr = new int[n];
        for (int i = 0; i < n; i++) {
            arr[i] = scn.nextInt();
        }
        int k = scn.nextInt();
        System.out.println(solution(arr, k));
    }

}

https://www.pepcoding.com/resources/data-structures-and-algorithms-in-java-levelup/hashmap-and-heaps/longest-subarray-with-sum-divisible-by-k-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 >>