Playlist
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Description
You are given a playlist of a radio station since its establishment. The playlist has a total of n songs.
What is the longest sequence of successive songs where each song is unique?
Input Format
The first input line contains an integer n: the number of songs.
The next line has n integers k1,k2,…,kn: the id number of each song.
Output Format
Print the length of the longest sequence of unique songs.8
1 2 1 3 2 7 4 25