题解 | 凯撒加密

import sys

def getascii(n,s):
    res = []
    for i in s:
        temp =ord(i)+n
        while temp > 122: # 合法范围：97-122
            temp = temp-122+96
        res.append(temp)
    return res

def reduction(s):
    res = ''.join([chr(i) for i in s])
    print(res)

if __name__=='__main__':
    data = sys.stdin.read().strip().split('\n')
    n = int(data[0])
    s = list(map(str,data[1].strip()))
    asciis=getascii(n,s)
    reduction(asciis)

思路是这样的：s每个字符切片，然后获取各个字符的ascii码，小写英文字符的ascii码在97-122之间，超过就要减少。由于n有可能大于26，所以用的是while而不是if