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leetcode做题记录0009
阅读量:352 次
发布时间:2019-03-04

本文共 756 字,大约阅读时间需要 2 分钟。

leetcode 0009

说明

只是为了记录一下,不求多快,也不深究。

会简要描述思路,代码中不写注释。

如碰到不会做的用了别人代码会在博客中标出。

题目描述

在这里插入图片描述

结果

在这里插入图片描述

思路

把数字每一位放到一个数组里,然后搞两个游标i,j分别从数组头和尾向中间遍历。

碰到num[i]!=num[j]的直接false。

遍历完了还没return false的话就return true。

代码

class Solution {       public boolean isPalindrome(int x) {           if(x<0) {           	return false;        }        if(x>=0&&x<10) {           	return true;        }        int[] num = new int[10];        for(int i=0;i<10;++i) {           	num[i] = -1;        }        int idx = 0;        while(true) {           	num[idx++] = x%10;        	x /= 10;        	if(x == 0) {           		break;        	}        }        for(int i = 0,j = idx - 1;i <= j;++i,--j) {           	if(num[i]!=num[j]) {           		return false;        	}        }        return true;    }}

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