IOI '98 - Setúbal, Portugal
Dr. Astro Insky works at a radiotelescope centre. Recently, she noticed a very curious microwave pulsing emission sent right from the centre of the galaxy. Is the emission transmitted by some extraterrestrial form of intelligent life? Or is it nothing but the usual heartbeat of the stars?
You must help Dr. Insky to find out the truth by providing a tool to analyse bit patterns in the files she records. Dr. Insky wants to find the patterns of length between (and including) A and B (0 < A ≤ B ≤ 12) that repeat themselves most often in the data file of each day. In each case, the greatest N (0 < N ≤ 20) distinct frequencies (that is, number of occurrences) are sought. Pattern occurrences may overlap, and only patterns that occur at least once are taken into account.
First line - The integer A indicating the minimum pattern length.
Second line - The integer B indicating the maximum pattern length.
Third line - The integer N indicating the number of distinct frequencies.
Fourth line - A sequence of
1 characters, terminated by a
Note: The input may be as large as 2 megabytes.
The output must be a report with at most N lines, listing the at most N greatest frequencies and corresponding patterns. The listing must be produced in decreasing order of pattern frequency, and consists of lines formatted like:frequency pattern pattern … pattern
where frequency is the number of occurrences of the patterns that follow. The patterns in each line must appear in decreasing order of length. Patterns of equal length must be listed in reverse numerical order. In case there are less than N distinct frequencies, the output listing will have less than N lines.
2 4 10 010100100100010001111011000010100110011110000100100111100100000002
23 00 15 10 01 12 100 11 001 000 11 10 010 8 0100 7 1001 0010 6 0000 111 5 1000 110 011 4 1100 0011 0001
This asks for the top ten frequencies of patterns of length between two and four that occur in the bit pattern:
Note that the fourth line of the input above appears split in order to fit herein. In this example, pattern
100 occurs 12 times, and pattern
1000 occurs 5 times. The most frequent pattern is
Point Value: 15 (partial)
Time Limit: 2.00s
Memory Limit: 32M
Added: Dec 21, 2013
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