Save the nature

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The new king of Byteland, John-2318, has just ascended the throne. As every new king, he wants to build a spectacular palace to showcase his wealth and power. We can consider Byteland as an N x M rectangular matrix A. If A[i][j] is positive, then it means that A[i][j] litres of oxygen are produced by trees in the cell with coordinates (i, j) every day. On the other hand, a negative value of A[i][

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solution.cppC++17

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