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Jeff got 2n real numbers a1, a2, ..., a2n as a birthday present. The boy hates non-integer numbers, so he decided to slightly "adjust" the numbers he's got. Namely, Jeff consecutively executes n o

One popular website developed an unusual username editing procedure. One can change the username only by deleting some characters from it: to change the current names, a user can pick number p and

time limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputWe all know the impressive story of Robin Hood. Robin Hood uses h

time limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputAt regular competition Vladik and Valera won a and b candies r

B. Vladik and Complicated Booktime limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputVladik had started reading a

The Golden Agetime limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputUnlucky year in Berland is such a year that i

Find Amirtime limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputA few years ago Sajjad left his school and register to anoth

A. Fake NP time limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputTavak and Seyyed are good friends. Seyyed is very

B. 3-palindrometime limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputIn the beginning of the new year Keivan decided to reverse his name. He do