题意 分析 这个数据范围容易使人想到折半搜索. 我们将字符串分为前后两部分.如果前半部分中搜得的前缀串为{S1, S2},那么后半部分中搜得的后缀串必须为{rev(S2), rev(S1)},且为有序对.对于两侧分别枚举每个字符的归属情况,hash后用map计数即可. 代码 #include<cstdlib> #include<cstdio> #include<cmath> #include<cstring> #include<ctime> #i…

题意:给你一段字符串,可以选择任意多的位置,每个位置会反转两边的字符串,问交错的字符串最长是多长? 思路:找规律,仔细分析样例1.假设位置为 1 2 3 4 5 6 7 8 9,反转之后会发现答案是7 8 9 1 2 3 4 5 6 ,其中答案串是7 8 9 1 2,所以可以把原字符串复制一份粘在原字符串后面,找最长的交错串即可. #include<cstdio> #include<algorithm> #include<cstring> #include<ios…

szzq学长出的题,先orz一下. day1 倾斜的线 做过差不多的题,写在我自己的博客里,我却忘得一干二净,反而李巨记得清清楚楚我写了的. 题目就是要最小化这个东西 $|\frac{y_i-y_j}{x_i-x_j}- \frac{P}{Q}|$ 通分 $\frac{Q*(y_i-y_j)-P*(x_i-x_j)}{Q*(x_i-x_j)}$ 把$Q*x$作为新的$x$,$Q*y-P*x$作为新的$y$,题面转换为求两点斜率绝对值的最小值. 按y排序后可发现答案一定出现在相邻的两点间(画图可得…

Given s1, s2, s3, find whether s3 is formed by the interleaving of s1 and s2. Example 1: Input: s1 = "aabcc", s2 = "dbbca", s3 = "aadbbcbcac" Output: true Example 2: Input: s1 = "aabcc", s2 = "dbbca", s3 =…

Hard! 题目描述: 给定三个字符串 s1, s2, s3, 验证 s3 是否是由 s1 和 s2 交错组成的. 示例 1: 输入: s1 = "aabcc", s2 = "dbbca", s3 = "aadbbcbcac" 输出: true 示例 2: 输入: s1 = "aabcc", s2 = "dbbca", s3 = "aadbbbaccc" 输出: false 解题思路:…

给定三个字符串 s1, s2, s3, 验证 s3 是否是由 s1 和 s2 交错组成的. 示例 1: 输入: s1 = "aabcc", s2 = "dbbca", s3 = "aadbbcbcac" 输出: true 示例 2: 输入: s1 = "aabcc", s2 = "dbbca", s3 = "aadbbbaccc" 输出: false 注意题目,s3是由s1和s2交错组成…

给定三个字符串 s1, s2, s3, 验证 s3 是否是由 s1 和 s2 交错组成的.例如,给定:s1 = "aabcc",s2 = "dbbca",当 s3 = "aadbbcbcac", 返回 true.当 s3 = "aadbbbaccc", 返回 false.详见:https://leetcode.com/problems/interleaving-string/description/ Ø d b b c aØ…

(1过,调试很久) 给定三个字符串 s1, s2, s3, 验证 s3 是否是由 s1 和 s2 交错组成的. 示例 1: 输入: s1 = "aabcc", s2 = "dbbca", s3 = "aadbbcbcac" 输出: true 示例 2: 输入: s1 = "aabcc", s2 = "dbbca", s3 = "aadbbbaccc" 输出: false 关键:设dp[i…

97. 交错字符串 给定三个字符串 s1, s2, s3, 验证 s3 是否是由 s1 和 s2 交错组成的. 示例 1: 输入: s1 = "aabcc", s2 = "dbbca", s3 = "aadbbcbcac" 输出: true 示例 2: 输入: s1 = "aabcc", s2 = "dbbca", s3 = "aadbbbaccc" 输出: false class So…

Given s1, s2, s3, find whether s3 is formed by the interleaving of s1 and s2. Input: s1 = "aabcc", s2 = "dbbca", s3 = "aadbbcbcac" Output: true 题意: 给定s1和s2,判断给定的s3是不是s1和s2交织相错后可以生成的字符串 思路: 遇到字符串的子序列或匹配问题巴普洛夫狗流哈喇子实验般的想到dp s1 =…