SGU 505 Prefixes and suffixes】的更多相关文章

题解   现将字符串排序: 那么某前缀在字符串中出现肯定是连续的:写几个案例就知道了:这是记录每个字符在以前缀排名的rank : 然后将字符串反序: 再排序:依照前缀,可以知道相同名字的后缀也会出现在一段排序好的连续的字符串里面:这样得到前缀的区间为 [a,b],  [c,d]: 只要统计每个字符是否在 a 到 b 之间: 同时满足在 c 到 d 之间:            获取某个前缀的第一个匹配段字符串 和 最后一个字符串也就是 [a,b] 使用了字典树搞: 然后 再用线段树保留最大值和最…
转载请注明出处: http://www.cnblogs.com/fraud/          ——by fraud D. Prefixes and Suffixes You have a string s = s1s2...s|s|, where |s| is the length of string s, and si its i-th character. Let's introduce several definitions: A substring s[i..j] (1 ≤ i ≤ j…
题目连接:Codeforces 432D Prefixes and Suffixes 题目大意:给出一个字符串,求全部既是前缀串又是后缀串的字符串出现了几次. 解题思路:依据性质能够依据KMP算法求出全部的前后缀串,然后利用dp求解,dp[i]表示从1到i这个子串出现过的次数. 转移方程dp[jump[i]]+=dp[i]. 随意一个dp[i]的初始状态应该是1. #include <cstdio> #include <cstring> const int N = 1e5+5; i…
D. Prefixes and Suffixes time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You have a string s = s1s2...s|s|, where |s| is the length of string s, and si its i-th character. Let's introduce s…
用扩展KMP做简单省力..... D. Prefixes and Suffixes time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You have a string s = s1s2...s|s|, where |s| is the length of string s, and si its i-th character.…
题目链接:Prefixes and Suffixes 题意:给定未知字符串长度n,给出2n-2个字符串,其中n-1个为未知字符串的前缀(n-1个字符串长度从1到n-1),另外n-1个为未知字符串的后缀(n-1个字符串长度从1到n-1),判断这2n-2个字符串分别为前缀还是后缀. 题解:从2n-2从找个n-1长度的字符串和1长度的字符串拼接,判断该字符串是否符合要求,能作为未知字符串.符合的话,直接输出答案. #include <set> #include <map> #includ…
http://codeforces.com/contest/1092/problem/C Ivan wants to play a game with you. He picked some string ss of length nn consisting only of lowercase Latin letters. You don't know this string. Ivan has informed you about all its improper prefixes and s…
手动转田神的大作:http://blog.csdn.net/tc_to_top/article/details/38793973 D. Prefixes and Suffixes time limit per test 1:second memory limit per test: 256 megabytes input: standard input output: standard output You have a string s = s1s2...s|s|, where |s| is…
                                                    D. Prefixes and Suffixes You have a string s = s1s2...s|s|, where |s| is the length of string s, and si its i-th character. Let's introduce several definitions: A substring s[i..j] (1 ≤ i ≤ j ≤ |s|)…
CF432D Prefixes and Suffixes 题意 给你一个长度为n的长字符串,"完美子串"既是它的前缀也是它的后缀,求"完美子串"的个数且统计这些子串的在长字符串中出现的次数 分析 求出nex数组 , 在求出每个前缀出现的次数 , 从nex[n] 往下走就行了 其实这道题是 , KMP 求每个前缀出现次数的模板题 求前缀出现次数的写法 for(int i = 1 ; i <= n ; ++i) num[i]++; for(int i = n ;…