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Rearrange Array such that adjoining distinction is odd
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import java.io.*;
import java.lang.*;
import java.util.*;
class GFG {
static void rearrange(int arr[], int n)
{
ArrayList<Integer> odd_ele = new ArrayList<>();
ArrayList<Integer> even_ele = new ArrayList<>();
int odd = 0;
int even = 0;
for (int i = 0; i < n; i++) {
if ((arr[i] & 1) == 1) {
odd_ele.add(arr[i]);
odd++;
}
else {
even_ele.add(arr[i]);
even++;
}
}
if (n % 2 == 0) {
if (odd == (n / 2) && even == (n / 2)) {
for (int i = 0; i < odd_ele.measurement(); i++) {
System.out.print(odd_ele.get(i) + " "
+ even_ele.get(i)
+ " ");
}
}
else {
System.out.println(-1);
}
}
else if (n % 2 != 0) {
if (even == ((n / 2) + 1)
|| odd == ((n / 2) + 1)) {
if (even == ((n / 2) + 1)) {
System.out.print(
even_ele.get(even_ele.measurement() - 1)
+ " ");
for (int i = 0; i < odd_ele.measurement();
i++) {
System.out.print(
odd_ele.get(i) + " "
+ even_ele.get(i) + " ");
}
}
else {
for (int i = 0; i < even_ele.measurement();
i++) {
System.out.print(
odd_ele.get(i) + " "
+ even_ele.get(i) + " ");
}
System.out.print(
odd_ele.get(odd_ele.measurement() - 1));
}
}
else {
System.out.println(-1);
}
}
System.out.println();
}
public static void most important(String[] args)
throws java.lang.Exception
{
int[] arr = { 6, 1, 3, 4, 5, 2 };
int N = arr.size;
rearrange(arr, N);
}
}
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