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  • poj 2406 Power Strings

    Time Limit: 3000MS   Memory Limit: 65536KB   64bit IO Format: %I64d & %I64u

     Status

    Description

    Given two strings a and b we define a*b to be their concatenation. For example, if a = "abc" and b = "def" then a*b = "abcdef". If we think of concatenation as multiplication, exponentiation by a non-negative integer is defined in the normal way: a^0 = "" (the empty string) and a^(n+1) = a*(a^n).

    Input

    Each test case is a line of input representing s, a string of printable characters. The length of s will be at least 1 and will not exceed 1 million characters. A line containing a period follows the last test case.

    Output

    For each s you should print the largest n such that s = a^n for some string a.

    Sample Input

    abcd
    aaaa
    ababab
    .
    

    Sample Output

    1
    4
    3
    

    Hint

    This problem has huge input, use scanf instead of cin to avoid time limit exceed.
    【解析】
    kmp算法 裸求最小循环节
    【code】
    #include<iostream>
    #include<cstring>
    #include<cstdio>
    using namespace std;
    #define N 1000009
    char s[N];
    int next[N];
    int l;
    void getnext()
    {
        l=strlen(s);
        next[0]=-1;
        for(int i=1,j;i<l;i++)
        {
            j=next[i-1];
            while(s[i]!=s[j+1]&&j>=0)
            j=next[j];
            next[i]=s[i]==s[j+1]?j+1:-1;
        }
        if(l%(l-next[l-1]-1)==0)
        printf("%d
    ",l/(l-next[l-1]-1));
        else
        printf("%d
    ",-1);
    }
    int main()
    {
        while(scanf("%s",s))
        {
            getnext();
        }
        return 0;
    }
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  • 原文地址:https://www.cnblogs.com/zzyh/p/6853602.html
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