Haido Skyscrapers/en

Instructions

Fill the grid with digits from the given range, so that each digits appears exactly once in every row and column. Each digit represents a building, with the height of that digit itself. A clue outside the grid indicates the heigth of one of the buildings that can be seen from the corresponding direction, taking into account that the higher buildings block the view of lower ones. For example, if the clue is 1, this means the building with the height 1 must be seen, so it must be in the first cell.