Total Accepted: 111287 Total Submissions: 474471 Difficulty: Easy Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 click to show spoilers. Have you thought about this? Here are some good questions to ask befo…

Reverse Integer Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321 time=272ms accepted public class Solution { public int reverse(int x) { long recv=0; int mod=0; int xabs=Math.abs(x); while(xabs>0){ mod=xabs%…

题目: Reverse digits of an integer. Example1: x = , return Example2: x = -, return - 思路:递归 解答: / test cases passed. Status: Accepted Runtime: ms Submitted: minutes ago 这个方法比较糟糕,时间太长用到递归但又没利用函数的返回值,中间还需要借助字符串过渡. public class Solution { StringBuilder res…

Reverse Integer Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 若反转的数溢出,直接返回0 可以用计算结果来判断溢出,也可以用因数来判断 Java代码实现: public class ReverseInteger { public static int reverseInt(int x){ if (x == 0) { return 0; } int…

7.Reverse Integer Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: Output: Example 2: Input: - Output: - Example 3: Input: Output: Note:Assume we are dealing with an environment which could only hold integers within the…

Reverse Integer Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 click to show spoilers. SOLUTION 1: 注意越界后返回0.先用long来计算,然后,把越界的处理掉. public class Solution { public int reverse(int x) { long ret = 0; while (x !…

今天做了下LeetCode上面字符串倒序的题目,突然想Python中字符串倒序都有哪些方法,于是网上查了下,居然有这么多种方法: 个人觉得,第二种方法是最容易想到的,因为List中的reverse方法比较常用,做LeetCode题目7. Reverse Integer也用了这种方法,程序耗时65ms #字符串的反转 #用到for循环的步长参数,从大到小循环,到0为止 def reverse1 (s): rt = '' for i in range(len(s)-1, -1, -1): rt +=…

Reverse digits of an integer. Returns 0 when the reversed integer overflows (signed 32-bit integer). Have you met this question in a real interview?     Example Given x = 123, return 321 Given x = -123, return -321 LeetCode上的原题,请参见我之前的博客Reverse Integ…

Reverse Integer Reverse digits of an integer. Example1: x =  123, return  321 Example2: x = -123, return -321 click to show spoilers. Have you thought about this? Here are some good questions to ask before coding. Bonus points for you if you have alr…

题目来源:https://leetcode.com/problems/reverse-integer/ Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 解题思路: 其实这道题看起来非常简单,要实现也是几行代码的事.但是有个小问题容易被忽略,就是边界问题.什么意思呢?如果我们输入的整数超出了int的表达范围,这个问题要怎么解决呢? 用比int更大的数据类型存储我们转…

7. Reverse Integer Total Accepted: 153147 Total Submissions: 644103 Difficulty: Easy Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321 思路: 本题思路很简单,有多种方法:要注意的就是判断反转之后的结果是否超出了int类型的范围. 第一种是直接对10取余和除,然后每加一位,就将原先…

1. Reverse Integer 题目链接 题目要求: Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321 click to show spoilers. Have you thought about this? Here are some good questions to ask before coding. Bonus points for you if…

7. Reverse Integer Total Accepted: 153147 Total Submissions: 644103 Difficulty: Easy Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321 思路: 本题思路很简单,有多种方法:要注意的就是判断反转之后的结果是否超出了int类型的范围. 第一种是直接对10取余和除,然后每加一位,就将原先…

Reverse Integer Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 click to show spoilers. Have you thought about this? Here are some good questions to ask before coding. Bonus points for you if you have alread…

Reverse Integer 想用余10直接算,没想到 -123%10 是 7, 原因 -123-(-123//10*10) r=a-n*[a/n] 以上,r是余数,a是被除数,n是除数. 唯一不同点,就是商向0或负无穷方向取整的选择,c从c99开始规定向0取整,python则规定向负无穷取整,选择而已. 所以套用上述公式为: C 语言:(a%n的符号与a相同) -9%7=-9 - 7*[-1]=-2: 9%-7=9 - -7*[-1]=2; Python语言::(a%n的符号与n相同) -9…

我现在在做一个叫<leetbook>的开源书项目,把解题思路都同步更新到github上了,需要的同学可以去看看 书的地址:https://hk029.gitbooks.io/leetbook/ 007. Reverse Integer[E]——处理溢出的技巧 题目 Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321 思路 这题完全没丝毫的难度,任何人几分钟都可以写…

题目:Reverse Integer 难度:Easy 题目内容: Given a 32-bit signed integer, reverse digits of an integer. Note:Assume we are dealing with an environment which could only hold integers within the 32-bit signed integer range. For the purpose of this problem, assum…

7.Reverse Integer Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: 123 Output: 321 Example 2: Input: -123 Output: -321 Example 3: Input: 120 Output: 21 Note:Assume we are dealing with an environment which could only stor…

7. Reverse Integer 题目描述: Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: 123 Output: 321 Example 2: Input: -123 Output: -321 Example 3: Input: 120 Output: 21 Note: Assume we are dealing with an environment which could o…

六月箴言 万物之中,希望最美:最美之物,永不凋零.—— 斯蒂芬·金 第二周算法记录 007 -- Reverse Integer (整数反转) 题干英文版: Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: 123Output: 321 Example 2: Input: -123Output: -321 Example 3: Input: 120Output: 21 Note:Assum…

7. Reverse Integer Easy Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: 123 Output: 321 Example 2: Input: -123 Output: -321 Example 3: Input: 120 Output: 21 Note: Assume we are dealing with an environment which could on…

今天的两道题关于基本数据类型的探讨,估计也是要考虑各种情况,要细致学习 7. Reverse Integer Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321 Have you thought about this? Here are some good questions to ask before coding. Bonus points for you if…

1.题目:   7. Reverse Integer Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: 123 Output: 321 Example 2: Input: -123 Output: -321 Example 3: Input: 120 Output: 21 Note:Assume we are dealing with an environment which could…

7. Reverse Integer 官方的链接:7. Reverse Integer Description : Given a 32-bit signed integer, reverse digits of an integer. Example1: Input: 123 Output: 321 Example2: Input: -123 Output: -321 Example3: Input: 120 Output: 21 Note: Assume we are dealing wit…

Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 public class Solution { public int reverse(int x) { if(x==Integer.MIN_VALUE) return 0; long result = 0; int i = 0; int temp = (x>0)?1:0; x = Math.abs(x); while…

问题: Reverse digits of an integer.Example1:x = 123, return 321Example2:x = -123, return -321 官方难度: Easy 翻译: 将一个整数倒转输出. 例子: 整数:123,倒转输出:321. 整数:-123,倒转输出:-321. 给定例子中,存在负数情况,将负数的输入转化成整数统一讨论,同时记录负数标志位,在返回时使用. 优先获取整数的位数,有两种方法:第一种是根据定义出发,循环将输入数字除以10,累加次数.这…

public class Solution { public int reverse(int x) { StringBuffer sb = new StringBuffer(x+"").reverse(); if(sb.charAt(sb.length()-1)=='-') { sb=new StringBuffer(sb.substring(0,sb.length()-1)); } int res=0; try { res= Integer.parseInt(sb.toString(…

这是悦乐书的第143次更新,第145篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第2题(顺位题号是7),给定32位有符号整数,然后将其反转输出.例如: 输入: 123 输出: 321 输入: -123 输出: -321 输入: 120 输出: 21 给定反转整数范围: [−2^31, 2^31 − 1],即在int的最小值.最大值之间,如果反转整数超过此范围,则返回0. 本次解题使用的开发工具是eclipse,jdk使用的版本是1.8,环境是win7 64位系统,…

Determine whether an integer is a palindrome. Do this without extra space. 分析:把一个数倒过来,然后看两个数是否相同. public class Solution { public boolean isPalindrome(int x) { ) { return false; } , inputX = x; ) { palindromeX = palindromeX * + (x % ); x = x / ; } ret…

题目 Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321 Have you thought about this? Here are some good questions to ask before coding. Bonus points for you if you have already thought through this! If the integ…