SDUT-14级训练1-Periodic Strings

最新推荐文章于 2024-11-07 20:27:42 发布

原创最新推荐文章于 2024-11-07 20:27:42 发布 · 560 阅读

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本文介绍了一种通过取余操作高效判断字符串最小周期的方法，并提供了一个C语言实现的示例程序。该程序能够读取一系列字符串并输出每个字符串的最小周期。

A character string is said to have period k if it can be formed by concatenating one or more repetitions of another string of length k. For example, the string "abcabcabcabc" has period 3, since it is formed by 4 repetitions of the string "abc". It also has periods 6 (two repetitions of "abcabc") and 12 (one repetition of "abcabcabcabc").

Write a program to read a character string and determine its smallest period.

Input

The first line oif the input file will contain a single integer N indicating how many test case that your program will test followed by a blank line. Each test case will contain a single character string of up to 80 non-blank characters. Two consecutive input will separated by a blank line.

Output

An integer denoting the smallest period of the input string for each input. Two consecutive output are separated by a blank line.

Sample Input

1

HoHoHo

Sample Output

AC code：

#include<stdio.h>
#include<string.h>
int main()
{
    char a[128];
    int n,i,k,d;
    scanf("%d",&n);
    while (n--)
    {
        scanf("%s",a);
        d = strlen(a);
        for (i = 1 ; i <= d ; i++)
            if (d%i == 0)
             {
                for (k = i ; k < d; k++)
                    if (a[k] != a[k%i])
                        break;
                if (k == d)
                {
                    printf("%d\n",i);
                    break;
                }
        }
        if (n)
            printf("\n");
    }
    return 0;
}
个人认为这道题坑还是比较多的，思路一开始还是不正确。时隔6天之后又重新思考，终于过了。初始思路就是copy字符到一个新的字符串发现这样会让asa这样的数据也成立，后来改来改去还是不正确，那就剩下改思路了。用下标取余，好方法！