long waktumulai;
long waktuakhir;

void swap(int* a, int* b) {
    int t = *a;
    *a = *b;
    *b = t;
}

int partition(int arr[], int low, int high) {
    int pivot = arr[high]; // pivot
    int i = (low - 1); // Index of smaller element

    for (int j = low; j <= high - 1; j++) {
        // If current element is smaller than the pivot
        if (arr[j] < pivot) {
            i++; // increment index of smaller element
            swap(&arr[i], &arr[j]);
        }
    }
    swap(&arr[i + 1], &arr[high]);
    return (i + 1);
}

void quickSort(int arr[], int low, int high) {
    if (low < high) {
        // pi is partitioning index, arr[pi] is now at right place
        int pi = partition(arr, low, high);

        // Separately sort elements before partition and after partition
        quickSort(arr, low, pi - 1);
        quickSort(arr, pi + 1, high);
    }
}

void printArray(int arr[], int size) {
    int i;
    for (i = 0; i < size; i++) {
        Serial.print(arr[i]);
        Serial.print(",");
    }
    Serial.println();
}

void setup() {
    Serial.begin(9600);
  int arr[] = {64, 25, 12, 22, 11, 13, 14, 161, 671, 537, 4, 56, 79, 80, 15};
  int n = sizeof(arr)/sizeof(arr[0]);
   Serial.print("Jumlah angka dalam array : ");
  Serial.println(n);
  Serial.println("Original array:");
  printArray(arr, n);
  
    waktumulai = micros();
    quickSort(arr, 0, n - 1);
    waktuakhir = micros();

    Serial.println("Sorted array:");
    printArray(arr, n);

    
    Serial.println();
    Serial.print("Waktu: ");
    Serial.print(waktuakhir-waktumulai);
    Serial.println(" micro/s");
}

void loop() {
    // nothing here
}