Repeated_String.java 文件源码

public static void main(String ... ags)throws IOException
{
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    String str = in.readLine();
    long n = Long.parseLong(in.readLine());
    long a =0;
    for(int i=0;i<str.length();i++)
    {   
        if(str.charAt(i)=='a')
            a++;
    }
    long c =n/(long)str.length();
    a *= c;
    c = n%(long)str.length();
    for(int i=0;i<(int)c;i++)
    {
        if(str.charAt(i)=='a')
            a++;
    }
    System.out.println(a);
}