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  • Periodic Strings(周期串)

    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

    2
    如果一个字符串可以由某个长度为k的字符串重复多次得到,则称该串以k为周期。例如,abcabcabc以3为周期(注意,它也以6和9为周期)
    输入一个长度不超过80的字符串,输出其最小周期。

    #include<stdio.h>
    #include<string.h>
    char s[100];
    int main()
    {
        int t,ok;
        scanf("%d",&t);    
        while(t--){
            scanf("%s",s);
            int n=strlen(s);
            for(int i=1;i<=n;i++){ //周期
                if(n%i==0){  //周期必须能够整除字符串长度,如ababab的周期为2,字符串长度为6,6%2=0,或者abcd的周期为4,字符串长度为4,4%4=0;
                    ok=true;
                    for(int j=i;j<n;j++){
                    if(s[j]!=s[j%i]){ //根据周期比较字符串
                     ok=false; 
                     break;
                    }
                }
                if(ok){
                    printf("%d
    ",i);
                    break;
                   }
                }
            }
            if(t!=0)
                printf("
    ");
        }
        return 0;
    }































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  • 原文地址:https://www.cnblogs.com/bearkid/p/7290896.html
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