157 lines
5.2 KiB
Fortran
157 lines
5.2 KiB
Fortran
program day3
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implicit none
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integer, parameter :: path_length = 100
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integer, parameter :: n_data_lines = 2
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integer, parameter :: max_chars = 2000
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character(path_length) :: fname
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integer :: n_arguments
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character(max_chars), allocatable :: data_strs(:)
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integer, allocatable :: line1(:,:)
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integer, allocatable :: line2(:,:)
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integer :: l1, l2, line1_len, line2_len
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integer :: manhattan, min_manhattan
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integer :: siglen, min_siglen
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n_arguments = command_argument_count()
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if (n_arguments .eq. 1) then
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call get_command_argument(1, fname)
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print *, "File: ", fname
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else
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print *, "Wrong number of arguments: ", n_arguments
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stop
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end if
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data_strs = read_instruction_strings(fname)
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line1 = all_occupied_points(data_strs(1))
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line2 = all_occupied_points(data_strs(2))
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line1_len = size(line1, 2)
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line2_len = size(line2, 2)
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min_manhattan = huge(min_manhattan)
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min_siglen = huge(min_siglen)
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print *, "Lengths: ", line1_len, line2_len
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do l1 = 1, line1_len
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do l2 = 1, line2_len
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if ((line1(1, l1) .eq. line2(1, l2)) .and. (line1(2, l1) .eq. line2(2, l2))) then
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manhattan = abs(line1(1, l1)) + abs(line1(2, l1))
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siglen = l1 + l2
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if ((manhattan .lt. min_manhattan) .and. (siglen .lt. min_siglen)) then
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write (*, 23) l1, l2, line1(1, l1), line1(2, l1), manhattan, siglen
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min_manhattan = manhattan
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min_siglen = siglen
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else if (siglen .lt. min_siglen) then
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write (*, 22) l1, l2, line1(1, l1), line1(2, l1), manhattan, siglen
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min_siglen = siglen
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else if (manhattan .lt. min_manhattan) then
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write (*, 21) l1, l2, line1(1, l1), line1(2, l1), manhattan, siglen
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min_manhattan = manhattan
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else
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write (*, 20) l1, l2, line1(1, l1), line1(2, l1), manhattan, siglen
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end if
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end if
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end do
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end do
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20 format(' ', i7, ',', i7, ' (', i5, ',', i5, '): ', i8, i8)
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21 format('* ', i7, ',', i7, ' (', i5, ',', i5, '): ', i8, i8)
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22 format('> ', i7, ',', i7, ' (', i5, ',', i5, '): ', i8, i8)
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23 format('+ ', i7, ',', i7, ' (', i5, ',', i5, '): ', i8, i8)
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print *
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print *, "Minimum manhattan: ", min_manhattan
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print *, "Minimum signal length: ", min_siglen
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deallocate(line1)
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deallocate(line2)
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deallocate(data_strs)
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contains
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function read_instruction_strings(fname) result(strs)
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implicit none
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character(path_length) :: fname
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character(max_chars), allocatable :: strs(:)
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integer :: i_read
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allocate(strs(n_data_lines))
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open(10, file=fname)
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do i_read=1,n_data_lines
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read(10, "(A)") strs(i_read)
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end do
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close(10)
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end function read_instruction_strings
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function all_occupied_points(istring) result(occupied)
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implicit none
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integer, parameter :: imax = 6
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character(max_chars) :: istring
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integer :: n_cmds
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integer :: i_chars, i1, i2, i_s
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integer :: t_strlen
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integer :: t_mvmnt, s_mvmnt
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integer :: d_x, d_y, c_x, c_y
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character(imax), allocatable :: tcmds(:)
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character(1), allocatable :: dirs(:)
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integer, allocatable :: mvmnts(:)
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integer, allocatable :: occupied(:,:)
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integer :: c_tot
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n_cmds = 1
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t_strlen = len_trim(istring)
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do i_chars=1,t_strlen
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if (istring(i_chars:i_chars) .eq. ',') then
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n_cmds = n_cmds + 1
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end if
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end do
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allocate(tcmds(1:n_cmds))
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allocate(dirs(1:n_cmds))
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allocate(mvmnts(1:n_cmds))
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read(istring, *) tcmds
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s_mvmnt = 0
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do i1 = 1,n_cmds
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dirs(i1) = tcmds(i1)(1:1)
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read(tcmds(i1)(2:), *) t_mvmnt
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s_mvmnt = s_mvmnt + t_mvmnt
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mvmnts(i1) = t_mvmnt
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end do
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allocate(occupied(1:2, 1:s_mvmnt))
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c_x = 0
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c_y = 0
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i_s = 1
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c_tot = 0
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do i1=1,n_cmds
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if (dirs(i1) .eq. 'U') then
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d_y = 1
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d_x = 0
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else if (dirs(i1) .eq. 'D') then
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d_y = -1
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d_x = 0
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else if (dirs(i1) .eq. 'L') then
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d_y = 0
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d_x = -1
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else
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d_y = 0
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d_x = 1
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end if
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t_mvmnt = mvmnts(i1)
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do i2 = 1, t_mvmnt
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c_x = c_x + d_x
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c_y = c_y + d_y
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occupied(1, i_s) = c_x
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occupied(2, i_s) = c_y
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i_s = i_s + 1
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c_tot = c_tot + 1
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end do
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end do
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deallocate(tcmds)
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deallocate(dirs)
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deallocate(mvmnts)
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end function all_occupied_points
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end program day3
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