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Dutch National Flag #1

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Dutch National Flag #1

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59 changes: 59 additions & 0 deletions 01.Array/24.Dutch_National_Flag.txt
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Original file line number Diff line number Diff line change
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#include<iostream>
#include<climits>
#include<algorithm>
using namespace std;
//========================

dutchNationalAlgo(int a[], int n){
int low = 0 ;
int mid = 0 ;
int high = n-1;
int temp;
while(mid<=high){
switch(a[mid]){
case 0:{
temp = a[low];
a[low] = a[mid];
a[mid] = temp;
low++;
mid++;
break;
}
case 1:{
mid++;
break;
}
case 2:{
temp = a[mid];
a[mid] = a[high];
a[high] = temp;
high--;
break;
}
}
}
}

//========================

int main(){

//===========MAIN STARTS================

cout<<"DPP's Notebook : Dutch National Flag Algorithm"<<endl;
int n ;
cin>>n;
int a[n];
for(int i= 0; i<n ;i++){
cin>>a[i];
}
dutchNationalAlgo(a,n);
for(int i= 0; i<n ;i++){
cout<<a[i]<<" ";
}


//===========MAIN ENDS=================
return 0;
}