const uint8_t LED_PINS[] = {13, 12, 11};
const uint8_t BTN_PINS[] = {5, 4, 3};


enum { FIRST, SECOND, THIRD };

void setup() 
{
   
    for (uint8_t i = 0; i < 3; i++) {
        pinMode(LED_PINS[i], OUTPUT);
    }

    
    for (uint8_t i = 0; i < 3; i++) {
        pinMode(BTN_PINS[i], INPUT_PULLUP);
    }
}

void loop() 
{
    
    if (!digitalRead(BTN_PINS[FIRST])) {
        moveForward();
        delay(200);
    } 
    else if (!digitalRead(BTN_PINS[SECOND])) {
        moveBackward();
        delay(200);
    } 
    else if (!digitalRead(BTN_PINS[THIRD])) {
        turnAllOn();
    }

    turnAllOff();
}



void moveForward() 
{
    for (uint8_t i = 0; i < 3; i++) {
        digitalWrite(LED_PINS[i], HIGH);
        delay(1400);
        digitalWrite(LED_PINS[i], LOW);
    }
}


void moveBackward() 
{
    for (int8_t i = 2; i >= 0; i--) {
        digitalWrite(LED_PINS[i], HIGH);
        delay(1400);
        digitalWrite(LED_PINS[i], LOW);
    }
}


void turnAllOn() 
{
    for (uint8_t i = 0; i < 3; i++) {
        digitalWrite(LED_PINS[i], HIGH);
    }
    delay(4200);
}


void turnAllOff() 
{
    for (uint8_t i = 0; i < 3; i++) {
        digitalWrite(LED_PINS[i], LOW);
    }
}