_input = list(map(lambda x:x.split(' '),input().split('\n')))
n,q = _input[0]
def max_int(num):
    result = 0
    while (num % 2) != 1:
        num /= 2
        result += 1
    return result

print([abs(s-t)/2**min(max_int(s),max_int(t),max_int(abs(s-t))) for s,t in _input[1:]])