from machine import Pin
from utime import sleep
print("叶海龙 202110733227")

LED = [Pin(18, Pin.OUT),Pin(19, Pin.OUT),Pin(21, Pin.OUT),Pin(2, Pin.OUT)]

KEY = [Pin(15, Pin.IN), Pin(22, Pin.IN), Pin(4, Pin.IN), Pin(13, Pin.IN)]

states = [0,0,0,0]

last_button_states = [1,1,1,1]

while True:
    for i, button in enumerate(KEY):
        current_button_state = button.value()
        
        if current_button_state == 0 and last_button_states[i] == 1:
            states[i] = not states[i]
            LED[i].value(states[i])
        
        last_button_states[i] = current_button_state
    sleep(0.01)