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Coral (Ranges) (1083)
Instruction:
Shade some cells black (leaving the other cells white) such that all shaded cells are connected orthogonally into a single region. All non-shaded cells must be connected orthogonally (through other non-shaded cells) to the edge of the grid. No 2×2 group of cells can be entirely shaded black.
The numbers to the left of (and above) the main grid represent the shortest and longest lengths of contiguous blackened cell blocks in the corresponding row (or column). Cell blocks must contain at least one unblackened cell between them.
It is possible that not all rows and columns have given numbers. It is up to you to determine what cells to blacken without that information.