Reverse digits of an integer.
Example1: x = 123, return 321
Example2: x = -123, return -321
把整数倒转。很容易,只要先判断是否负数,存起来。之后取绝对值,把绝对值倒转后再决定是否是负数。
class Solution { public: int reverse(int x) { bool neg = (x < 0); x = abs(x); int ans = 0; while(x) { int t = x%10; ans = ans*10 + t; x = x/10; } if(neg) ans = -ans; return ans; } };
Python:
class Solution: # @return an integer def reverse(self, x): flag = x < 0 x = abs(x) x = list(str(x)) x.reverse() x = ''.join(x) if flag: return int('-'+x) else: return int(x)
原文地址:http://blog.csdn.net/jcjc918/article/details/39898833