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In mathematics, a matrix (plural matrices) is a rectangular array of numbers, symbols, or expressions, arranged in rows and columns. The individual items in a matrix are called its elements or entries.

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Tetris-like algorithm (2D matrix)

if (matrix[i][j - 1] == '.' && matrix[i][j] == '#' && matrix[i][j + 2] == '.' && matrix[i + 1][j] == '.' && matrix[i + 1][j + 1] == '#' && matrix[i + 1][j + 2] == '#' && matrix[i + 1][j … matrix[i + 1][j] = '*'; matrix[i][j] = ' …
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