Q-3 PepCoding | Check If An Array Can Be Divided Into Pairs Whose Sum Is Divisible By K

PHOTO

Mon Jan 23 2023 06:50:14 GMT+0000 (Coordinated Universal Time)

Saved by @Ayush_dabas07

class Solution {
    public boolean canArrange(int[] arr, int k) {
        //HashMap and heap Q-3
        int frequency[] = new int[k];

        //find remainders
        for(int val : arr){
            int rem = val%k;
            
            //if -ve add k to it
            if(rem < 0) rem +=k;

            frequency[rem]++;
        }

        //check all rem and [k-rem]
        if(frequency[0] %2 != 0) return false;

        for(int i = 1 ; i <= k/2 ; i++){
            if(frequency[i] != frequency[k-i])
            return false;
        }

        return true;
    }
}

https://www.pepcoding.com/resources/data-structures-and-algorithms-in-java-levelup/hashmap-and-heaps/check-if-an-array-cab-be-divided-into-pairs-whose-sum-is-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 >>