Land of the Shire

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The land of The Shire is separated from Rivendell by a long hanging bridge. When viewed from the side, the bridge seems to be an endless array of planks. The planks of the array are numbered from left to right with integers, starting with 1. The elves from Rivendell are playing a game. At the beginning of the game the i-th elf is above the plank number hi. Every elf can only take one step to the l

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solution.cppC++17

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