Python3 代码

n = eval(input())

r = [0, 25, 50, 75, 100]

if (n < r[0] or n > r[4]):
    print("Fora de intervalo")
else:
    for i in range (0, len(r)-1):
        if ( n >= r[i] and n <= r[i+1]):
            if (i == 0):
                print("Intervalo ["+ str(r[i]) + "," + str(r[i+1]) + "]")
            else:
                print("Intervalo ("+ str(r[i]) + "," + str(r[i+1]) + "]")
            break