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sort-an-array-of-0s-1s-2s.cpp
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#include<bits/stdc++.h>
using namespace std;
class Solution
{
public:
void sort012(int arr[], int n)
{
//using dutch flag method
int low = 0;
int mid = 0 ;
int high = n-1;
while(mid <= high)
{
if(arr[mid] == 0)
{
swap(arr[mid], arr[low]);
mid++;
low++;
}
else if(arr[mid] == 1)
{
mid++;
}
else
{
swap(arr[mid], arr[high]);
high--;
}
}
//using count
// int zero = 0;
// int one = 0;
// int two = 0;
// // Count the number of 0s, 1s and 2s in the array
// for (int i = 0; i < n; i++) {
// switch (a[i]) {
// case 0:
// zero++;
// break;
// case 1:
// one++;
// break;
// case 2:
// two++;
// break;
// }
// }
// // Update the array
// int i = 0;
// // Store all the 0s in the beginning
// while (zero > 0) {
// a[i++] = 0;
// zero--;
// }
// // Then all the 1s
// while (one > 0) {
// a[i++] = 1;
// one--;
// }
// // Finally all the 2s
// while (two > 0)
// {
// a[i++] = 2;
// two--;
// }
// using sort function
// return sort(a, a+n+1);
}
};
int main() {
int t;
cin >> t;
while(t--){
int n;
cin >>n;
int a[n];
for(int i=0;i<n;i++){
cin >> a[i];
}
Solution ob;
ob.sort012(a, n);
for(int i=0;i<n;i++){
cout << a[i] << " ";
}
cout << endl;
}
return 0;
}