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PROGRAM one
implicit none
integer, parameter :: WIDTH = 99, HEIGHT = 99
character(WIDTH), dimension(HEIGHT) :: lines
integer :: i, j
integer, dimension(HEIGHT, WIDTH) :: grid, tmp
logical, dimension(HEIGHT, WIDTH) :: visible
read (*, *) lines
do i = 1, HEIGHT
do j = 1, WIDTH
read (lines(i)(j:j), '(I1)') grid(i, j)
end do
end do
visible(:, :) = .false.
visible(1, :) = .true.
visible(HEIGHT, :) = .true.
visible(:, 1) = .true.
visible(:, WIDTH) = .true.
tmp = grid
do i = 2, HEIGHT-1
visible(i, :) = visible(i, :) .or. tmp(i-1, :) < grid(i, :)
tmp(i, :) = max(tmp(i-1, :), grid(i, :))
end do
tmp = grid
do i = HEIGHT-1, 2, -1
visible(i, :) = visible(i, :) .or. tmp(i+1, :) < grid(i, :)
tmp(i, :) = max(tmp(i+1, :), grid(i, :))
end do
tmp = grid
do i = 2, WIDTH-1
visible(:, i) = visible(:, i) .or. tmp(:, i-1) < grid(:, i)
tmp(:, i) = max(tmp(:, i-1), grid(:, i))
end do
tmp = grid
do i = WIDTH-1, 2, -1
visible(:, i) = visible(:, i) .or. tmp(:, i+1) < grid(:, i)
tmp(:, i) = max(tmp(:, i+1), grid(:, i))
end do
print *, sum(merge(1, 0, visible))
end program one
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