HDU

#include <iostream>
#include <algorithm>
#define MaxSize 1000010
using namespace std;

char s[MaxSize];
int Next[MaxSize];
int Len;

void GetNext()
{
    int i = 0, j = Next[0] = -1;
    while (i < Len)
    {
        if (j == -1 || s[i] == s[j])
            Next[++i] = ++j;
        else
            j = Next[j];
    }
}

int main()
{
    ios::sync_with_stdio(false);
    int cas = 0;
    while (true)
    {
        cin >> Len;
        if (Len == 0)
            break;
        cin >> s;
        cas++;
        GetNext();
        cout << "Test case #" << cas << endl;
        for (int i = 1; i <= Len; ++i)
        {
            int circle = i - Next[i];
            if (Next[i] == 0)
                continue;
            if (i % circle == 0)
                cout << i << ' ' << i / circle << endl;
        }
        cout << endl;
    }

    return 0;
}