#define DELAY_TIME 50
const uint8_t LED_PIN[5]={11,1,9,5,13};

void setup() {
  for (uint8_t i=0;i<5;i++){
    pinMode(LED_PIN[i], OUTPUT);
  }
}

void loop() {
  // digitalWrite(LED_PIN[0],HIGH);
  // delay(1000);
  // digitalWrite(LED_PIN[0],LOW);
  // delay(1000);
  for(uint8_t i=0;i<5;i++){
    digitalWrite(LED_PIN[i],HIGH);
    delay(DELAY_TIME);
    digitalWrite(LED_PIN[i],LOW);
    delay(DELAY_TIME);
  }

  for(uint8_t i=3;i>0;i--){
    digitalWrite(LED_PIN[i],HIGH);
    delay(DELAY_TIME);
    digitalWrite(LED_PIN[i],LOW);
    delay(DELAY_TIME);
  }
}