State management (idle, moving up, moving down) in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the initial state as idle.

LLD

state = '[1]'

Drag options to blanks, or click blank then click option'

Aidle

Bmoving_up

Cmoving_down

Dstopped

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing 'moving_up' or 'moving_down' as initial state.

The initial state should be 'idle' to represent no movement.

2fill in blank

medium

Complete the code to change state to moving up when the elevator goes up.

LLD

if direction == 'up':
    state = '[1]'

Drag options to blanks, or click blank then click option'

Amoving_up

Bidle

Cmoving_down

Dstopped

Attempts:

3 left

💡 Hint

Common Mistakes

Setting state to 'idle' or 'moving_down' when direction is 'up'.

When the elevator moves up, the state should be 'moving_up'.

3fill in blank

hard

Fix the error in the state transition when the elevator moves down.

LLD

if direction == 'down':
    state = '[1]'

Drag options to blanks, or click blank then click option'

Aidle

Bmoving_up

Cmoving_down

Dstopped

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'moving_up' or 'idle' instead of 'moving_down'.

The state must be 'moving_down' when the elevator moves down.

4fill in blank

hard

Fill both blanks to update the state correctly based on direction.

LLD

if direction == 'up':
    state = '[1]'
elif direction == 'down':
    state = '[2]'

Drag options to blanks, or click blank then click option'

Amoving_up

Bidle

Cmoving_down

Dstopped

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up states or using 'idle' incorrectly.

Use 'moving_up' when direction is 'up' and 'moving_down' when direction is 'down'.

5fill in blank

hard

Fill all three blanks to implement a function that returns the next state based on current state and direction.

LLD

def next_state(current_state, direction):
    if current_state == 'idle' and direction == 'up':
        return '[1]'
    elif current_state == 'idle' and direction == 'down':
        return '[2]'
    else:
        return '[3]'

Drag options to blanks, or click blank then click option'

Amoving_up

Bmoving_down

Cidle

Dstopped

Attempts:

3 left

💡 Hint

Common Mistakes

Returning wrong states or not handling else case.

The function returns 'moving_up' if idle and direction is up, 'moving_down' if idle and direction is down, else stays 'idle'.