leetcode[9]:Palindrome Number
2015-06-29 21:24
162 查看
Palindrome Number
Determine whether an integer is a palindrome. Do this without extra space.
Some hints:
Could negative integers be palindromes? (ie, -1)
If you are thinking of converting the integer to string, note the restriction of using extra space.
You could also try reversing an integer. However, if you have solved the problem “Reverse Integer”, you know that the reversed integer might overflow. How would you handle such case?
There is a more generic way of solving this problem.
除整,取余,比较。
Determine whether an integer is a palindrome. Do this without extra space.
Some hints:
Could negative integers be palindromes? (ie, -1)
If you are thinking of converting the integer to string, note the restriction of using extra space.
You could also try reversing an integer. However, if you have solved the problem “Reverse Integer”, you know that the reversed integer might overflow. How would you handle such case?
There is a more generic way of solving this problem.
bool isPalindrome(int x) { int i,j,k,l; if(x<0) return false; if(x<10) return true; k=x; for(l=0;k>0;l++) k=k/10; j=pow(10,l-1); for(i=l;i>l/2;i--) { if((x/j)%10==x%10) {x=x/10;j=j/100;if(x<10) return true;} else return false; } };
除整,取余,比较。
相关文章推荐
- 微软Word 2007数学插件 Microsoft Math 提供下载
- 关于C# Math 处理奇进偶不进的实现代码
- JavaScript中的Math.SQRT1_2属性使用简介
- JavaScript Math.ceil() 函数使用介绍
- 与Math.pow 相反的函数使用介绍
- JavaScript中使用指数方法Math.exp()的简介
- JavaScript使用Math.Min返回两个数中较小数的方法
- Ajax获取页面被缓存的解决方法
- JavaScript高级程序设计 阅读笔记(十二) js内置对象Math
- JavaScript中Math对象使用说明
- javascript对象之内置对象Math使用方法
- 基于java math API 的详细解释说明
- 简介JavaScript中用于处理正切的Math.tan()方法
- 浅谈JavaScript中的Math.atan()方法的使用
- PHP内置的Math函数效率测试
- 在JavaScript中使用对数Math.log()方法的教程
- JavaScript中用于四舍五入的Math.round()方法讲解
- 简介JavaScript中Math.LOG10E属性的使用
- 在PHP模板引擎smarty生成随机数的方法和math函数详解
- JavaScript中反正弦函数Math.asin()的使用简介