Day 12 part 2?
Petra
parent
f20eb10586
commit
3477b81b21
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@ -1,5 +1,5 @@
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FC:=gfortran
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FFLAGS:=-Wall -Wno-maybe-uninitialized
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FFLAGS:=-Wall -Wno-maybe-uninitialized -O2
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BIN:=./bin
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SRC:=./src
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BINS:=./bin/day01.bin ./bin/day01b.bin ./bin/day02.bin ./bin/day03.bin ./bin/day04.bin ./bin/day05.bin ./bin/day05b.bin ./bin/day06.bin ./bin/day07.bin ./bin/day07b.bin ./bin/day08.bin ./bin/day08b.bin ./bin/day09.bin ./bin/day10.bin ./bin/day11.bin ./bin/day12.bin
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@ -2,24 +2,29 @@ program day12
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implicit none
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integer, parameter :: max_chars = 300
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integer, parameter :: max_rows = 2000
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integer, parameter :: b_kind = selected_int_kind(15)
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character(200) :: fname
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character(max_chars) :: fline
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character(max_chars) :: springs
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integer :: n_springs
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character(max_chars) :: springs, spt
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integer :: tn_spr, n_springs
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integer :: n_arguments
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integer :: n_repeats
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integer :: istat
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integer :: strlen
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integer, allocatable :: specifiers(:)
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integer :: n_specifiers
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integer :: i, i2
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integer, allocatable :: tspec(:), specifiers(:)
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integer :: tn_spec, n_specifiers
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integer :: i, i2, i3
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integer :: s_pos
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integer :: val, total_valid
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integer :: num_wc
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integer(kind=b_kind) :: val, total_valid
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n_arguments = command_argument_count()
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if (n_arguments .eq. 1) then
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if (n_arguments .eq. 2) then
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call get_command_argument(1, fname)
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print *, "File: ", trim(fname)
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print *
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call get_command_argument(2, fline)
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read(fline, *) n_repeats
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print *, "Number of repeats: ", n_repeats
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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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@ -33,32 +38,46 @@ program day12
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exit
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end if
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s_pos = scan(fline, " ")
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n_springs = s_pos - 1
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springs = fline(1:n_springs)
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n_specifiers = 1
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tn_spr = s_pos - 1
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spt = fline(1:tn_spr)
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tn_spec = 1
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do i2 = s_pos+1, strlen
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if (fline(i2:i2) .eq. ',') then
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n_specifiers = n_specifiers + 1
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tn_spec = tn_spec + 1
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end if
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end do
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n_specifiers = tn_spec * (1 + n_repeats)
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allocate(tspec(1:tn_spec))
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allocate(specifiers(1:n_specifiers))
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read(fline((s_pos + 1):strlen), *) specifiers
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print *, trim(springs)
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call set3(springs)
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val = 0
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do
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if (consistent(springs, n_springs, specifiers, n_specifiers)) then
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val = val + 1
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print *, trim(springs)
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end if
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if (no3(springs)) then
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exit
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end if
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call iterate(springs, strlen)
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read(fline((s_pos + 1):strlen), *) tspec
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do i2=0,n_repeats
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do i3=1,tn_spec
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specifiers(i2 * tn_spec + i3) = tspec(i3)
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end do
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end do
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springs = spt
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if (n_repeats .ge. 1) then
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do i2=1,n_repeats
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springs = trim(springs) // '?' // trim(spt)
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end do
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end if
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n_springs = (n_repeats + 1) * tn_spr + n_repeats
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print *, "Row: ", i
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print *, "Original: ", trim(spt)
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print *, "Original specifiers: "
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print "(20i2)", tspec
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print *, "Expanded: ", trim(springs)
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print *, "Expanded specifiers: "
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print "(20i2)", specifiers
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num_wc = numstr(trim(springs), '?')
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print *, "Length: ", n_springs
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print *, "Number of wildcards: ", num_wc
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val = nvalid(springs, n_springs, specifiers, n_specifiers, .true.)
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print *, "Valid: ", val
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print *
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total_valid = total_valid + val
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deallocate(tspec)
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deallocate(specifiers)
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end do
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close(10)
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@ -66,50 +85,8 @@ program day12
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print *, "Total valid: ", total_valid
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contains
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subroutine set3(springs)
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character(*), intent(inout) :: springs
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integer :: pos
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do
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pos = scan(springs, '?')
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if (pos .eq. 0) then
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exit
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end if
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springs(pos:pos) = '3'
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end do
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end subroutine
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subroutine iterate(springs, nspr)
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character(*), intent(inout) :: springs
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integer, intent(in) :: nspr
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integer :: p1, p2
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p1 = 1
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do
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if (p1 .gt. nspr) then
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exit
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end if
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p2 = scan(springs(p1:nspr), '3>')
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if (p2 .eq. 0) then
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exit
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end if
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p2 = p2 + p1 - 1
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if (springs(p2:p2) .eq. '3') then
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springs(p2:p2) = '>'
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exit
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else
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springs(p2:p2) = '3'
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! carry the '>'
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p1 = p2 + 1
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end if
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end do
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end subroutine
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function no3(springs)
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character(*), intent(in) :: springs
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logical :: no3
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no3 = (scan(springs, '3') .eq. 0)
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end function no3
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function consistent(springs, n_spr, specs, n_specs)
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implicit none
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character(*), intent(in) ::springs
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integer, intent(in) :: specs(:)
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integer, intent(in) :: n_spr, n_specs
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@ -125,14 +102,14 @@ program day12
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! We've run out of springs
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return
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end if
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c2 = scan(springs(c1:n_spr), '#3')
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c2 = scan(springs(c1:n_spr), '#')
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if (c2 .eq. 0) then
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consistent = speccur .eq. n_specs
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! Also run out of springs
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return
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end if
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c2 = c1 + c2 - 1
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c3 = verify(springs(c2:n_spr), '#3')
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c3 = verify(springs(c2:n_spr), '#')
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if (c3 .eq. 0) then
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! Ends at end of string
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c3 = n_spr
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@ -153,5 +130,96 @@ program day12
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end do
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print *, '???'
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end function consistent
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function numstr(springs, str)
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implicit none
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character(*), intent(in) :: springs, str
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integer :: numstr
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integer :: sprlen, i
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sprlen = len_trim(springs)
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numstr = 0
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do i=1,sprlen
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if (scan(springs(i:i), str) .ne. 0) then
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numstr = numstr + 1
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end if
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end do
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end function numstr
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function viable(springs, n_spr, specs, n_specs)
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implicit none
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character(*), intent(in) ::springs
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integer, intent(in) :: specs(:)
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integer, intent(in) :: n_spr, n_specs
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logical :: viable
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character(len=1) :: ch
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integer :: i, i2, spi, spc, nrq, remt
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logical :: ch1v, ch2v
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spi = 0
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spc = 0
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viable = .true.
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ch2v = .false.
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do i=1,n_spr
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ch1v = ch2v
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ch = springs(i:i)
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if (ch .eq. '?') then
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nrq = numstr(springs(i:n_spr), '?#')
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remt = 0
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do i2=spi,n_specs
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remt = remt + specs(i2)
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end do
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remt = remt - spc
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viable = (nrq .ge. remt)
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return
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end if
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ch2v = scan(ch, '#') .ne. 0
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if (ch2v) then
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if (ch1v) then
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spc = spc + 1
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if (spc .gt. specs(spi)) then
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viable = .false.
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return
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end if
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else
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spc = 1
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spi = spi + 1
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if (spi .gt. n_specs) then
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viable = .false.
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return
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end if
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end if
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end if
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end do
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end function viable
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recursive function nvalid(springs, n_spr, specs, n_specs, r_branch) result(nv)
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implicit none
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character(len=max_chars), intent(in) ::springs
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integer, intent(in) :: specs(:)
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integer, intent(in) :: n_spr, n_specs
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logical, intent(in) :: r_branch
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integer :: nv
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integer :: s_pos
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character(len=max_chars) :: test_spr
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nv = 0
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s_pos = scan(springs, '?')
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if (r_branch) then
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print *, "Right branch depth: ", s_pos
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end if
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if (s_pos .eq. 0) then
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if (consistent(springs, n_spr, specs, n_specs)) then
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nv = nv + 1
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end if
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return
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end if
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test_spr = springs
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test_spr(s_pos:s_pos) = '#'
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if (viable(test_spr, n_spr, specs, n_specs)) then
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nv = nv + nvalid(test_spr, n_spr, specs, n_specs, .false.)
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end if
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test_spr(s_pos:s_pos) = '.'
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if (viable(test_spr, n_spr, specs, n_specs)) then
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nv = nv + nvalid(test_spr, n_spr, specs, n_specs, r_branch)
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end if
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end function nvalid
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end program day12
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