2023 Day 12 part 1
Petra
parent
97d6c075f3
commit
f20eb10586
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@ -2,7 +2,7 @@ FC:=gfortran
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FFLAGS:=-Wall -Wno-maybe-uninitialized
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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
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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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all: aoc19
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File diff suppressed because it is too large
Load Diff
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@ -0,0 +1,7 @@
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???.### 1,1,3
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.??..??...?##. 1,1,3
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?#?#?#?#?#?#?#? 1,3,1,6
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????.#...#... 4,1,1
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????.######..#####. 1,6,5
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?###???????? 3,2,1
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@ -0,0 +1,157 @@
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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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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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integer :: n_arguments
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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 :: s_pos
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integer :: 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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call get_command_argument(1, fname)
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print *, "File: ", trim(fname)
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print *
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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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open(10, file=fname)
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total_valid = 0
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do i=1,max_rows
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read(10, "(a)", iostat=istat) fline
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strlen = len_trim(fline)
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if ((strlen .eq. 0) .or. (is_iostat_end(istat))) then
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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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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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end if
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end do
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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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end do
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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(specifiers)
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end do
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close(10)
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print *
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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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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 :: consistent
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integer :: c1, c2, c3, i, speccur, clen
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consistent = .true.
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c1 = 1
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speccur = 0
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do i = 1, n_spr
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if (c1 .gt. n_spr) then
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consistent = speccur .eq. n_specs
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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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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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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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else
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c3 = c2 + c3 - 2
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end if
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speccur = speccur + 1
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if (speccur .gt. n_specs) then
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consistent = .false.
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return
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end if
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clen = c3 - c2 + 1
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if (clen .ne. specs(speccur)) then
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consistent = .false.
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return
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end if
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c1 = c3 + 1
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end do
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print *, '???'
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end function consistent
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end program day12
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