- Time limit: 1.00 s
- Memory limit: 512 MB
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?
The first input line contains an integer n: the number of songs.
The next line has n integers k_1,k_2,\ldots,k_n: the id number of each song.
Print the length of the longest sequence of unique songs.
- 1 \le n \le 2 \cdot 10^5
- 1 \le k_i \le 10^9
8 1 2 1 3 2 7 4 2