链接:leetcode-cn.com/problem 著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。 思路: 转成字符串之后,从字符串中间往两边进行对比。或者直接将字符串倒序后进行对比。 import math class Solution: def isPalindrome(self, x: int) -> bool: if x < 0: return False if x < 10: ...
click to show spoilers. 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...
There is a more generic way of solving this problem. 注意问题要求O(1)空间复杂度,注意负数不是回文数。 思路1:将输入整数转换成倒序的一个整数,再比较转换前后的两个数是否相等,但是这样需要额外的空间开销 思路2:每次提取头尾两个数,判断它们是否相等,判断后去掉头尾两个数。 1classSolution {2public:3boo...
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题目地址:leetcode-cn.com/problem 编写一个程序,通过填充空格来解决数独问题。 一个数独的解法需遵循如下规则:数字1-9 在每一行只能出现一次。数字1-9 在每一列只能出现一次。数字1-9 在每一个以粗实线分隔的 3x3 宫内只能出现一次。空白格用 '.' 表示。 一个数独。 答案被标成红色。 提示: 给定的数独...
leetcode(9) Palindrome Number 技术标签: leetcodeProblem Determine whether an integer is a palindrome. Do this without extra space. 首先明确一个概念,“什么是不使用额外空间”,这是在leetcode上的一个回答: “without extra space” usually means with O(1) space. so if you use a temp variable ...
Problem 1: Leetcode 40 给定一个数组 candidates 和一个目标数 target ,找出 candidates 中所有可以使数字和为 target 的组合。 candidates 中的每个数字在每个组合中只能使用一次。 比方说candidates = [10,1,2,7,6,1,5], target = 8,那么输出就是 ...
Hi, I need help understanding this question solution. The problem is https://leetcode.com/problems/find-the-minimum-cost-array-permutation/ Basically we are given a permutation of 0 to n and have to construct another permutation resres that minimizes the function: ∑n−1i=0∣∣res[i]...
A collection of Python codes for Leetcode Problem of the Day leetcode leetcode-solutions leetcode-practice leetcode-python leetcode-python3 leetcode-solution leetcode-programming-challenges leetcode-solutions-python problem-of-the-day problem-of-the-day-solutions leetcode-potd Updated Dec 23, ...
#TitleSolutionDifficulty 1 Search in a big sorted array Java Medium 2 Search Range in Binary Search Tree Java MediumAbout LeetCode Problems' Solutions Resources Readme Activity Stars 0 stars Watchers 2 watching Forks 4.9k forks Report repository Releases No releases published Packages No...