使用python实现回文数的四种方法小结
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
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