Longest k-Good Segment

1000ms

262144K

Description:

The array a with n integers is given. Let's call the sequence of one or more consecutive elements in a segment. Also let's call the segment k-good if it contains no more than k different values.

Find any longest k-good segment.

As the input/output can reach huge size it is recommended to use fast input/output methods: for example, prefer to use scanf/printf instead of cin/cout in C++, prefer to use BufferedReader/PrintWriter instead of Scanner/System.out in Java.

Input:

The first line contains two integers n, k (1 ≤ k ≤ n ≤ 5·10⁵) — the number of elements in a and the parameter k.

The second line contains n integers a_i (0 ≤ a_i ≤ 10⁶) — the elements of the array a.

Output:

Print two integers l, r (1 ≤ l ≤ r ≤ n) — the index of the left and the index of the right ends of some k-good longest segment. If there are several longest segments you can print any of them. The elements in a are numbered from 1 to n from left to right.

Sample Input:

5 5
1 2 3 4 5

Sample Output:

1 5

Sample Input:

9 3
6 5 1 2 3 2 1 4 5

Sample Output:

3 7

Sample Input:

3 1
1 2 3

Sample Output:

1 1

Informação

Provedor Codeforces

Código CF616D