Python3 代码

x = eval(input())
RANGE = [25, 50, 75, 100]

for i in range(0, 4):
    if x <= RANGE[i] and x >= 0 and x <= 100:
        if RANGE[i] == 25:
            print("Intervalo ["+str(RANGE[i]-25)+","+str(RANGE[i])+"]")
        else:
            print("Intervalo ("+str(RANGE[i]-25)+","+str(RANGE[i])+"]")
        break
        break

if x < 0 or x > 100:
    print("Fora de intervalo")