#P9664. [ICPC2021 Macao R] LCS Spanning Tree

    ID: 8981 Type: RemoteJudge 5000ms 1024MiB Tried: 0 Accepted: 0 Difficulty: 6 Uploaded By: Tags>2021后缀自动机,SAMO2优化生成树后缀数组,SA后缀树ICPC澳门

[ICPC2021 Macao R] LCS Spanning Tree

题目描述

Given a complete undirected graph of nn vertices and nn strings s1,s2,,sns_1, s_2, \cdots, s_n, the weight of edge connecting vertices ii and jj is equal to the length of the longest common substring (LCS) between sis_i and sjs_j. Compute the maximum total weight of any spanning tree on this graph.

A substring of a string can be obtained by removing some (possibly zero) characters from the beginning and/or the end of that string. For example, maca, aca and cau are all substrings of macau, while acu is not.

输入格式

There is only one test case in each test file.

The first line of the input contains one integer nn (1n2×1061 \leq n \leq 2 \times 10^6) indicating the number of vertices and strings.

For the following nn lines, the ii-th line contains one string sis_i (1si2×1061 \le |s_i| \le 2 \times 10^6) consisting only of lowercase English letters.

It's guaranteed that the sum of lengths of all strings will not exceed 2×1062 \times 10^6.

输出格式

Output one line containing one integer indicating the answer.

题目大意

【题目描述】

给定一个有 nn 个顶点的完全无向图和 nn 个字符串 s1,s2,,sns_1, s_2, \cdots, s_n,连接顶点 iijj 的边的权重等于字符串 sis_isjs_j 的最长公共子串(LCS)的长度。计算此图上任意生成树的最大总权重。

一个字符串的子串可以通过从该字符串的开头和/或结尾删除一些(可能为零)字符来获得。例如,“maca”、“aca” 和“cau”都是“macau”的子串,而“acu”不是。

【输入格式】

每个测试文件中包含一个测试用例。

输入的第一行包含一个整数 nn (1n2×1061 \leq n \leq 2 \times 10^6),表示顶点和字符串的数量。

接下来的 nn 行,第 ii 行包含一个字符串 sis_i (1si2×1061 \le |s_i| \le 2 \times 10^6),由小写英文字母组成。

保证所有字符串的长度之和不超过 2×1062 \times 10^6

【输出格式】

输出一行,包含一个整数,表示答案。

翻译来自于:ChatGPT

4
icpc
macau
regional
contest
4
3
ababa
babab
aba
7