Replace repeating elements with greater that greatest values
Given an integer array, if an integer is repeating then replace it with a number greater than that number that has not been inserted yet in the array.
Examples:
Input : arr = {1, 3, 4, 5, 3}
Output : 1 3 4 5 6
Explanation: Here 3 is repeating so it is replaced with 6Input : arr = {1, 3, 4, 4, 5, 3}
Output : 1 3 4 6 5 7
We need to replace repeating numbers with a number that does not appear in the array and is one greater than the largest present in the array.
Calculate the maximum element in the array and replace the repeated elements with the maxx+1 and update the maxx element as visited. In the implementation, basic concept of hashing is used.
Implementation:
C++
// CPP program to replace repeating elements // with greater than the greatest. #include <bits/stdc++.h> using namespace std; void replaceElements( int arr[], int n) { // Maximum element in an array int maxx = *max_element(arr, arr+n); unordered_set< int > s; for ( int i = 0; i < n; i++) { // check whether the element is // repeated or not if (s.find(arr[i]) == s.end()) s.insert(arr[i]); else { // update the repeated element with the // maxx element arr[i] = maxx + 1; maxx++; // update the max // mark the maximum element as visited s.insert(maxx); } } } // Driver code int main() { int arr[] = { 1, 3, 4, 5, 3 }; int n = sizeof (arr)/ sizeof (arr[0]); replaceElements(arr, n); for ( int i = 0; i < n; i++) cout << arr[i] << " " ; return 0; } |
Java
// Java program to replace repeating elements // with greater than the greatest. import java.util.*; class Solution { //returns the maximum element static int max_element( int arr[]) { int max=arr[ 0 ]; for ( int i= 1 ;i<arr.length;i++) { if (max<arr[i]) max=arr[i]; } return max; } static void replaceElements( int arr[], int n) { // Maximum element in an array int maxx = max_element(arr); Vector<Integer> s= new Vector<Integer>(); for ( int i = 0 ; i < n; i++) { // check whether the element is // repeated or not if (!s.contains(arr[i])) s.add(arr[i]); else { // update the repeated element with the // maxx element arr[i] = maxx + 1 ; maxx++; // update the max // mark the maximum element as visited s.add(maxx); } } } // Driver code public static void main(String args[]) { int arr[] = { 1 , 3 , 4 , 5 , 3 }; int n = arr.length; replaceElements(arr, n); for ( int i = 0 ; i < n; i++) System.out.print( arr[i] + " " ); } } //contributed by Arnab Kundu |
Python3
# Python 3 program to replace repeating # elements with greater than the greatest. def replaceElements( arr, n): # Maximum element in an array maxx = max (arr) s = [] for i in range (n) : # check whether the element is # repeated or not if arr[i] not in s: s.append(arr[i]) else : # update the repeated element # with the maxx element arr[i] = maxx + 1 maxx + = 1 # update the max # mark the maximum element # as visited s.append(maxx) # Driver code if __name__ = = "__main__" : arr = [ 1 , 3 , 4 , 5 , 3 ] n = len (arr) replaceElements(arr, n) for i in range ( n): print (arr[i], end = " " ) # This code is contributed by ita_c |
C#
// C# program to replace repeating elements // with greater than the greatest. using System; using System.Collections.Generic; class GFG { //returns the maximum element static int max_element( int []arr) { int max = arr[0]; for ( int i = 1; i < arr.Length; i++) { if (max < arr[i]) max = arr[i]; } return max; } static void replaceElements( int []arr, int n) { // Maximum element in an array int maxx = max_element(arr); List< int > s = new List< int >(); for ( int i = 0; i < n; i++) { // check whether the element is // repeated or not if (!s.Contains(arr[i])) s.Add(arr[i]); else { // update the repeated element with the // maxx element arr[i] = maxx + 1; maxx++; // update the max // mark the maximum element as visited s.Add(maxx); } } } // Driver code public static void Main() { int []arr = { 1, 3, 4, 5, 3 }; int n = arr.Length; replaceElements(arr, n); for ( int i = 0; i < n; i++) Console.Write( arr[i] + " " ); } } // This code is contributed by PrinciRaj1992 |
Javascript
<script> // JavaScript program to replace repeating elements // with greater than the greatest. //returns the maximum element function max_element(arr) { let max=arr[0]; for (let i=1;i<arr.length;i++) { if (max<arr[i]) max=arr[i]; } return max; } function replaceElements(arr,n) { // Maximum element in an array let maxx = max_element(arr); let s=[]; for (let i = 0; i < n; i++) { // check whether the element is // repeated or not if (!s.includes(arr[i])) s.push(arr[i]); else { // update the repeated element with the // maxx element arr[i] = maxx + 1; maxx++; // update the max // mark the maximum element as visited s.push(maxx); } } } // Driver code let arr=[1, 3, 4, 5, 3]; let n = arr.length; replaceElements(arr, n); for (let i = 0; i < n; i++) document.write( arr[i] + " " ); // This code is contributed by rag2127 </script> |
1 3 4 5 6
Time complexity: O(n) where n is the number of elements in the given array
Auxiliary space: O(n) for storing elements in the HashSet.
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