Tag: bitmask

m = int(input())
s = 0  # 비트마스크

for _ in range(m):
    command = input().strip().split()
    
    if command[0] == 'add':
        x = int(command[1])
        s |= (1 << x)
    elif command[0] == 'remove':
        x = int(command[1])
        s &= ~(1 << x)
    elif command[0] == 'check':
        x = int(command[1])
        print(1 if s & (1 << x) else 0)
    elif command[0] == 'toggle':
        x = int(command[1])
        s ^= (1 << x)
    elif command[0] == 'all':
        s = (1 << 21) - 1
    elif command[0] == 'empty':
        s = 0