const int ledGanjil[] = {3, 5};
const int ledGenap[] = {6, 9};
const int arrSize = sizeof(ledGanjil) / sizeof(int);

void setup() {
  for (int i = 0; i < arrSize; i++) {
    pinMode(ledGanjil[i], OUTPUT);
    pinMode(ledGenap[i], OUTPUT);
  }
}

void loop() {
  for (int i = 0; i < arrSize; i++) {
    digitalWrite(ledGenap[i], LOW);
    digitalWrite(ledGanjil[i], HIGH);
  }
  delay(1000);
  for (int i = 0; i < arrSize; i++) {
    digitalWrite(ledGanjil[i], LOW);
    digitalWrite(ledGenap[i], HIGH);
  }
  delay(1000);
}