Fullmetal Alchemist

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After completing the preliminary tests, Full Metal now faces his final exam. Captain Mustang gives him an n*m grid of letters. He defined distance between two rows of the grid as the largest absolute difference between letters in the same column. Full Metal is assigned to mark all the rows. The cost of marking the first row of his choice is zero. Thereafter the cost of marking each row is equal

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solution.cppC++17

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