解法1:字符串反转 解法2:数学运算(求余)转换 解法3:递归解法 这个题其实是 LeetCode 9 的基础题。可见,LeetCode 的题目编排就是乱来。 不过呢,相对 LeetCode 9,此题存在一些小的细节必须考虑周全。 题目要求看上去很简单,就是把一个整数从右到左翻过来。比如5,翻过来还是5;123,翻过来就是 321;-124,反过...
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, assume that your function returns 0 when the reversed integer overflows. Solution classSolution{public:intreverse(intx){longlongres =0;while(...
原题链接: https://leetcode.com/problems/reverse-integer/ 一:原题内容 Reverse digits of an integer. Example1:x = 123, return 321 Example2:x = -123, return -321 二:分析理解 我们需要考虑反转后的数可能会溢出int给出的大小,而且这题也没有说明如果反转溢出应该怎么办,看了别人...
}Stringstr=String.valueOf(Math.abs(x));StringBuildersb=newStringBuilder(str);Stringafterreverse=sb.reverse().toString();if(afterreverse.length() >10) {return0; }longx_reverse=Long.parseLong(flag+afterreverse);if(x_reverse > Integer.MAX_VALUE || x_reverse < Integer.MIN_VALUE) { x_reverse...
Did you notice that the reversed integer might overflow? Assume the input is a 32-bit integer, then the reverse of 1000000003 overflows. How should you handle such cases? For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows. ...
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输出:4321 2. 输入:-1234 输出:-4321 3. 输入:120 输出:21 注意:反转数字后的大小是否在int范围之内 Java解法一:我分成两种情况讨论,正负数,利用StringBuilder().reverse().toString()进行反转,再分别与Integer.MIN_VALUE/Integer.MAX_VALUE比较,符合返回结果值,不符合返回0 ...
陆陆续续在LeetCode上刷了一些题,一直没有记录过,准备集中整理记录一下 java:classSolution{publicint reverse(int x){long num=0;while(x!=0){num=num*10+x%10;x=x/10;}if(num>=Integer.MAX_VALUE||num<=Integer.MIN_VALUE){return0;}return(int)num;}}python:classSolution:defreverse(self,x):...
Input: 120 Output: 21 Note: Assume we are dealing with an environment which could only store integers within the32-bit signedinteger range: [−231, 23−1] . For the purpose of this problem, assume that your function returns 0 when the reversed integer overflows ...
其他Java相关优化操作: 数组最大长度为tokens.length / 2 + 1 switch代替if-else,效率优化 Integer.parseInt代替Integer.valueOf,减少自动拆箱装箱操作 附两种方法:纯数组模拟栈实现(推荐):栈实现: 栈 Java 数组 106 16.8K 32Adoring ・ 2025.02.18 数字入栈、符号计算 Code C++ 栈 1 177 0...