Problem #11 - the salvation of the monks
Pt En Today's problem is a riddle of the same style as problems #09 and #10 . Problem statement : the island depicted above used to be home to $2018$ monks that led a simple life, far from the bad, vain and consumerist habits of today's societies. Between many other deprivations, the monks never saw themselves on the mirror nor on any other reflecting surface. One day the volcano in the centre of the island - slowly but steadily - started hinting at an incoming eruption and the monks grew worried as the days passed. Some days later, at exactly 23h59, a divine being showed itself to the monks in their dreams and offered them a painless death - thus avoiding the wrath of the volcano - as long as every monk found out the colour of his eyes. The divine being also told them that every monk in the island had either blue or green eyes and that there was at least one monk with blue eyes. The divine being left with its final condition: every day , at 23h59, all monks who knew the ...