题意 : 给出一个长度为 N 的序列,再给出一个 K 要求求出出现了至少 K 次的最长可重叠子串的长度 分析 : 后缀数组套路题,思路是二分长度再对于每一个长度进行判断,判断过程就是对于 Height 数组进行限定长度的分组策略,如果有哪一组的个数 ≥  k 则说明可行! 分组要考虑到一个事实,对于每一个后缀,与其相匹配能够产生最长的LCP长度的串肯定是在后缀数组中排名与其相邻. 一开始对分组的理解有误,所以想了一个错误做法 ==> 遍历一下 Height 将值 ≥ (当前二分长度) 的做一次贡…

Milk Patterns   Description Farmer John has noticed that the quality of milk given by his cows varies from day to day. On further investigation, he discovered that although he can't predict the quality of milk from one day to the next, there are some…

Milk Patterns Case Time Limit: 2000MS Description Farmer John has noticed that the quality of milk given by his cows varies from day to day. On further investigation, he discovered that although he can't predict the quality of milk from one day to th…

题意 找出出现k次的可重叠的最长子串的长度 题解 用后缀数组. 然后求出heigth数组. 跑单调队列就行了.找出每k个数中最小的数的最大值.就是个滑动窗口啊 (不知道为什么有人写二分,其实写啥都差不多快,可能是因为二分是一个常见的模型吧) #include<iostream> #include<cstring> #include<cstdio> #include<cmath> #include<algorithm> using namespac…

题目链接 题目描述 给定一个字符串,求至少出现 \(k\) 次的最长重复子串,这 \(k\) 个子串可以重叠. 思路 二分 子串长度,据其将 \(h\) 数组 分组,判断是否存在一组其大小 \(\geq k\). Code #include <cstdio> #include <vector> #include <iostream> #define maxn 1000000 #define maxm maxn + 10 #define maxd 20010 using…

题目题目:http://poj.org/problem?id=3261 Milk Patterns Time Limit: 5000MS Memory Limit: 65536K Total Submissions: 18880 Accepted: 8336 Case Time Limit: 2000MS Description Farmer John has noticed that the quality of milk given by his cows varies from day t…

Musical Theme Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 30941   Accepted: 10336 Description A musical melody is represented as a sequence of N (1<=N<=20000)notes that are integers in the range 1..88, each representing a key on the…

Musical ThemeTime Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://poj.org/problem?id=1743 Description A musical melody is represented as a sequence of N (1<=N<=20000)notes that are integers in the range 1..88, each representing a key on the piano. It…

题目冲鸭:http://poj.org/problem?id=1743 Musical Theme Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 36590   Accepted: 12087 Description A musical melody is represented as a sequence of N (1<=N<=20000)notes that are integers in the range 1…

题意 : 给 n 个数组成的串,求是否有多个“相似”且不重叠的子串的长度大于等于5,两个子串相似当且仅当长度相等且每一位的数字差都相等. 分析 :  根据题目对于 “ 相似 ” 串的定义,我们可以将原串变成由原串元素两两做差得到的一个“差值串”,例如 1 2 3 5 就会变成 1 1 2 这个串,显然若原串长为 len 则 “差值串” 的长度就为 len - 1.转化为 “差值串” 之后原问题就变成了是否存在两个及两个以上的不重叠子串元素相同且长度大于或等于 4 ,但是呢这样的转化有个小问题,还…