Remember the story of Little Match Girl? By now, you know exactly what matchsticks the little match girl has, please find out a way you can make one square by using up all those matchsticks. You should not break any stick, but you can link them up, a…

还记得童话<卖火柴的小女孩>吗?现在,你知道小女孩有多少根火柴,请找出一种能使用所有火柴拼成一个正方形的方法.不能折断火柴,可以把火柴连接起来,并且每根火柴都要用到.输入为小女孩拥有火柴的数目,每根火柴用其长度表示.输出即为是否能用所有的火柴拼成正方形.示例 1:输入: [1,1,2,2,2]输出: true解释: 能拼成一个边长为2的正方形,每边两根火柴. 示例 2:输入: [3,3,3,3,4]输出: false解释: 不能用所有火柴拼成一个正方形.注意:    给定的火柴长度和在 0 到…

Remember the story of Little Match Girl? By now, you know exactly what matchsticks the little match girl has, please find out a way you can make one square by using up all those matchsticks. You should not break any stick, but you can link them up, a…

Leetcode之深度优先搜索(DFS)专题-473. 火柴拼正方形(Matchsticks to Square) 深度优先搜索的解题详细介绍,点击 还记得童话<卖火柴的小女孩>吗?现在,你知道小女孩有多少根火柴,请找出一种能使用所有火柴拼成一个正方形的方法.不能折断火柴,可以把火柴连接起来,并且每根火柴都要用到. 输入为小女孩拥有火柴的数目,每根火柴用其长度表示.输出即为是否能用所有的火柴拼成正方形. 示例 1: 输入: [1,1,2,2,2] 输出: true 解释: 能拼成一个边长为2的…

Remember the story of Little Match Girl? By now, you know exactly what matchsticks the little match girl has, please find out a way you can make one square by using up all those matchsticks. You should not break any stick, but you can link them up, a…

题目链接:http://acm.swust.edu.cn/problem/0179/ Time limit(ms): 1000 Memory limit(kb): 65535   Description 火柴棍可以拼成10进制的数字,如图所示: 现在,gogo给你个n个火柴棍,要求你输出最小能拼成的数字和最大能拼成的数字.   Input 第一行输入一个整数T:T组测试数据(T<100) 每行输入一个n (2 ≤ n ≤ 100): 表示你有的火柴棍数.   Output 最小能拼成的数字和最大…

为了使数字最大,首先要最大化其位数. 设$f[i][j][k]$表示从低到高考虑了$i$位,手头火柴棍个数为$j$,第$i$位是不是$0$时,最少移动多少根火柴. 若$f[i][0][非0]\leq k$,则存在一个长度为$i$的数,由此可以求出最大长度. 确定长度之后,再从高到低逐位贪心确定每一位即可. 时间复杂度$O(nk)$. #include<cstdio> #include<cstring> #include<algorithm> using namespac…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 回溯法 日期 题目地址:https://leetcode.com/problems/matchsticks-to-square/description/ 题目描述 Remember the story of Little Match Girl? By now, you know exactly what matchsticks the little…

题目: Given a 2D binary matrix filled with 0's and 1's, find the largest square containing all 1's and return its area. For example, given the following matrix: 1 0 1 0 0 1 0 1 1 1 1 1 0 0 1 0 Return 4. 题目链接:https://leetcode.com/problems/maximal-square…

Given a 2D binary matrix filled with 0's and 1's, find the largest square containing all 1's and return its area. For example, given the following matrix: 1 0 1 0 0 1 0 1 1 1 1 1 0 0 1 0 Return 4. Credits:Special thanks to @Freezen for adding this pr…