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Parking Lot (Loop) (1237)
Instruction:
Locate some automobiles in the grid. Automobiles have a 1×2 or 1×3 shape, do not overlap each other, and can be oriented horizontally or vertically. Each automobile contains exactly one given number. The number in the automobile represents the number of other positions the automobile can "drive" to along its long direction without overlapping with another automobile (that is, the number of empty cells directly ahead of or behind the automobile's edges of size 1).
Additionally, it must be possible to draw a single non-intersecting loop through the centers of all empty cells (and no cells with automobiles), using only orthogonal loop segments.