[LeetCode]7. Reverse Integer整数反转

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【LeetCode】Reverse Integer(整数反转)

这道题是LeetCode里的第7道题. 题目描述: 给出一个 32 位的有符号整数,你需要将这个整数中每位上的数字进行反转. 示例 1: 输入: 123 输出: 321 示例 2: 输入: -123 输出: -321 示例 3: 输入: 120 输出: 21 注意: 假设我们的环境只能存储得下 32 位的有符号整数,则其数值范围为 [−231, 231 − 1].请根据这个假设,如果反转后整数溢出那么就返回 0. 首先,这是一道简单题,根据我多年的做题经验来看,这道题肯定有坑,绝对会有 IN…

[LeetCode]7. Reverse Integer整数反转

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 store integers within…

LeetCode 7 Reverse Integer（反转数字）

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…

【LeetCode】7. Reverse Integer 整数反转

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 公众号:负雪明烛本文关键词:整数,反转,题解,Leetcode, 力扣,Python, C++, Java 目录题目描述题目大意解题方法转成字符串数学日期题目地址:https://leetcode.com/problems/reverse-integer/description/ 题目描述 Given a 32-bit signed integer, reverse d…

Leetcode7 : Reverse Integer 整数反转问题

问题描述 Example1: x = 123, return 321 Example2: x = -123, return -321 原题链接: https://leetcode.com/problems/reverse-integer/ 解决方案 public int reverse(int x) { long res = 0; //need to consider the overflow problem while(x != 0){ res = res * 10 + x % 10; //…

leetcode：Reverse Integer（一个整数反序输出）

Question:Reverse digits of an integer. Example1: x = 123, return 321Example2: 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…

leetcode：Reverse Integer 及Palindrome Number

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…

Leetcode#344. Reverse String（反转字符串）

题目描述编写一个函数,其作用是将输入的字符串反转过来. 示例 1: 输入: "hello" 输出: "olleh" 示例 2: 输入: "A man, a plan, a canal: Panama" 输出: "amanaP :lanac a ,nalp a ,nam A" 思路思路一: 逆序拼接字符串思路二: 依次交换两边的值思路三: 直接调用StringBuilder 的 reverse() 思路四: 用栈来实现反…

LeetCode 7 Reverse Integer & int

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…

Leetcode 7. Reverse Integer（水）

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…