Inverse of an array

#1

i know how to reverrse array using for loop but dont know how to do using recursive function please help me out!!

#2

hi @sahilkumar23102003_bbf6ee38349d98a1
Inverse is Simply swapping the value of the array with the value at that index.

Algo

  1. Create a new Array say narr and original array is arr.
  2. now at the arr[i]th index of narr save the ith value.(previously i is the index and arr[i] is the value bt now arr[i] is the index and i is the value.)
  3. return new array.

refer this code ->

#include<iostream>
#include<bits/stdc++.h>
using namespace std;
int main() {
	int N;
	cin>>N;
	int a[N];
	for(int i =0;i<N;i++)
		cin>>a[i];
	int b[N];
	for(int j=0;j<N;j++){
		b[a[j]]=j;
	}
    for(int i=0;i<N;i++){
        cout<<b[i]<<" ";
    }
	return 0;
}
#3

hi @sahilkumar23102003_bbf6ee38349d98a1
For recursive approach, refer this -->

And inverse of array and reverse, both are different…

#4

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#5

@sahilkumar23102003_bbf6ee38349d98a1,
what is the issue is the doubt still not clear?

#6

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