题目链接 给出一个字符串,你可以通过在首尾加入字符使其变成一个具有周期T(T>=2)的字符串,求所需加入的最少字符数. 所考察算法仍然是对next数组含义的理解 #include<cstdio> #include<cstring> ]; ]; int len; void getNext() { ,k=-; next[]=-; while(j<len) ||S[j]==S[k]) next[++j]=++k; else k=next[k]; } void printNex…

题目请点我 题解: 题目大意:有一个字符串s.能够在前后加入字符,使字符串成为一个循环次数至少为2的循环字符串.输出最少须要加入的字符数目. 首先能够证明题目能够等价为仅仅在末尾加入字符使满足题意.要找到加入资格字符我们首先要找到循环单位的长度.利用一个辅助数组储存从起始位置開始长度为i的串的循环长度,初始值为i,利用与Next数组之间的关系来更新.找到循环长度.比方字符串abcabc,Next[i] = 3,cycle[3] = 3,有等价关系i-Next[i] = cycle[Next[i]…

一.题目 HDU3746 二.分析 KMP比较好解决的一个问题:如果求一个串中的循环节? 仔细回想KMP的用法,重点是next数组,相当于就是后缀和前缀的比较,那么不正是方便了我们确定循环节? 如果以字符串的最后一个位置(非字符)分析,那么这个位置的当前next值,就是我们串前缀和后缀的交集的最长值,所以只需要用长度Len去减去这个next值就可以得出循环节的长度了. 1 $Len\%(Len-next[Len]) \&\& Len != Len - next[Len]$ 此时,字符串已经…

Cyclic Nacklace Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1946    Accepted Submission(s): 854 Problem Description CC always becomes very depressed at the end of this month, he has checked…

Cyclic Nacklace Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 5663    Accepted Submission(s): 2557 Problem Description CC always becomes very depressed at the end of this month, he has checke…

Cyclic Nacklace Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2716    Accepted Submission(s): 1244 Problem Description CC always becomes very depressed at the end of this month, he has checked…

Cyclic Nacklace 题意:给一个长度为Len( 3 <= Len <= 100000 )的英文串,问你在字符串后面最少添加几个字符可以使得添加后的串为周期串? Sample Input 3 aaa abca abcde   Sample Output 0 2 5   思路:要是写过period再来写这道题会发现很简单:就是在getfail()得到f[]之后,贪心地看最后一个字符所能用到的最长后缀长度为多少?而这个后缀长度就是n - n%len;(n为字符串长度,len为循环节的长度…

Cyclic Nacklace Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2538    Accepted Submission(s): 1154 Problem Description CC always becomes very depressed at the end of this month, he has checke…

Cyclic Nacklace Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4212    Accepted Submission(s): 1913 Problem Description CC always becomes very depressed at the end of this month, he has checked…

Cyclic Nacklace Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 16307    Accepted Submission(s): 6753 Problem Description CC always becomes very depressed at the end of this month, he has checke…