Bear and Random Grid

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Don't miss the "Tests Generation" section. The input is generated in a special way for this problem. Bear Limak lives in a square grid that consists of N rows and N columns. Each cell is either empty or blocked, denoted with character '.' or '#' respectively. Limak can only visit empty cells and he can't move outside the grid. Limak wants to impress a girl he likes. He should make a sequence of

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solution.cppC++17

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