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JayFu
learningnote
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PeriodicStrings.py
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#如果一个字符串可以有某个长度为k的字符串重复多次得到,则称该串以k为周期
#输入一个不超过80的字符串,输出其最小周期
#输入案例:abcabcabc
#输出案例:abc
#输入hujikolp 输出hujikolp
#输入0 输出0
#输入hujikolphujikolphujiko 输出hujikolphujikolphujiko
#输入baozi baozi baozi baozi baozi 输出baozi (有空格)
#本题中,没有提到关于空格、标点等的处理。在之后学习中掌握了相关处理之后可以加上相关判断
#输入空格 输出空格
import sys
#设置输入并初始化参数
OriginList = input()
k = 0
OutputList = ''
#判断输入是否越界
#理论上不会越界,但是本题中要求字符串长度80以内,因此加入判断
if len(OriginList) > 80:
print('error')
sys.exit()
for i in OriginList:
OutputList += i
MutiNum = len(OriginList) // len(OutputList)
#如果长度不能被整除,必不是最小周期,跳过该次循环
if len(OriginList) % len(OutputList) :
continue
#判断是否周期与每段相同
if OriginList == OutputList * MutiNum :
#输出并终止程序
print(OutputList)
sys.exit()
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