使用python实现回文数的四种方法小结
人气:0回文数就是指整数倒过来和原整数相等。
Example 1: Input: 121 Output: true
Example 2: Input: -121 Output: false Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.
Example 3: Input: 10 Output: false Explanation: Reads 01 from right to left. Therefore it is not a palindrome.
1:整数转字符串,通过下标对比确定该整数是否为回文数
str_x = str(x) for i in range(0,int(len(str_x)/2)): if str_x[i] != str_x[-i-1]: return False return True
2:字符串切片操作,str[index:index:step],中括号里面分别为:字符起点、终点和步长
str_x = str(x) return str_x == str_x[::-1]
3:数学计算的方法,对比反转整数的值
if x<0: return False temp_x = x; palindromeNum = 0 while temp_x != 0: palindromeNum = palindromeNum*10 + temp_x%10 temp_x /= 10 return palindromeNum == x
4:整数转字符串,反转字符串,对比反转后字符串与原字符串是否相等
str_x = str(x) str_y = "" for i in str_x: str_y = i + str_y return str_y == str_x
以上这篇使用python实现回文数的四种方法小结就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持。
您可能感兴趣的文章:
加载全部内容