BISHOP

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We have a board with H horizontal rows and W vertical columns of squares. There is a bishop at the top-left square on this board. How many squares can this bishop reach by zero or more movements? Here the bishop can only move diagonally. More formally, the bishop can move from the square at the r1-th row (from the top) and the c1-th column (from the left) to the square at the r2-th row and the

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solution.cppC++17

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