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Paint by Numbers (Black or White) (882)
Instruction:
Blacken some cells in the grid such that the numbers to the left of (and above) the main grid represent the lengths of contiguous cell blocks in the corresponding row (or column). The lengths are given in order from left to right (or top to bottom), and cell blocks must contain at least one cell of the other color between them.
For each row (and column), the numbers might represent the lengths of black cells, or the lengths of white cells; it is your job to figure out which is which. (It is possible for the numbers to be consistent with the black cells and also be consistent with the white cells.)