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DutchNationalFlag.java
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DutchNationalFlag.java
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package com.aman.data_structures;
public class DutchNationalFlag {
public static void main(String[] args) {
DutchNationalFlag dnf = new DutchNationalFlag();
int[] arr = new int[] {0, 0, 1, 2, 0, 1, 2};
dnf.print(arr);
dnf.threeNumberSort(arr);
dnf.print(arr);
}
public void print(int[] arr){
int n = arr.length;
for(int i = 0; i < n; i++){
System.out.print(arr[i] + " ");
}
System.out.println();
}
public void swap(int[] arr, int i, int j){
int temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
public void threeNumberSort(int[] arr){
int i = 0;
int j = 0;
int k = arr.length - 1;
while(i <= k){
if(arr[i] == 0){
swap(arr, i, j);
i++;
j++;
}
else if(arr[i] == 1){
i++;
}
else if(arr[i] == 2){
swap(arr, i, k);
k--;
}
}
}
}