2023 Day 12 part 1

main
Petra 2023-12-12 21:38:42 +13:00
parent 97d6c075f3
commit f20eb10586
4 changed files with 1166 additions and 1 deletions

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@ -2,7 +2,7 @@ FC:=gfortran
FFLAGS:=-Wall -Wno-maybe-uninitialized
BIN:=./bin
SRC:=./src
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
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
all: aoc19

1001
2023/data/day12.txt 100644

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@ -0,0 +1,7 @@
???.### 1,1,3
.??..??...?##. 1,1,3
?#?#?#?#?#?#?#? 1,3,1,6
????.#...#... 4,1,1
????.######..#####. 1,6,5
?###???????? 3,2,1

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2023/src/day12.f90 100644
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@ -0,0 +1,157 @@
program day12
implicit none
integer, parameter :: max_chars = 300
integer, parameter :: max_rows = 2000
character(200) :: fname
character(max_chars) :: fline
character(max_chars) :: springs
integer :: n_springs
integer :: n_arguments
integer :: istat
integer :: strlen
integer, allocatable :: specifiers(:)
integer :: n_specifiers
integer :: i, i2
integer :: s_pos
integer :: val, total_valid
n_arguments = command_argument_count()
if (n_arguments .eq. 1) then
call get_command_argument(1, fname)
print *, "File: ", trim(fname)
print *
else
print *, "Wrong number of arguments: ", n_arguments
stop
end if
open(10, file=fname)
total_valid = 0
do i=1,max_rows
read(10, "(a)", iostat=istat) fline
strlen = len_trim(fline)
if ((strlen .eq. 0) .or. (is_iostat_end(istat))) then
exit
end if
s_pos = scan(fline, " ")
n_springs = s_pos - 1
springs = fline(1:n_springs)
n_specifiers = 1
do i2 = s_pos+1, strlen
if (fline(i2:i2) .eq. ',') then
n_specifiers = n_specifiers + 1
end if
end do
allocate(specifiers(1:n_specifiers))
read(fline((s_pos + 1):strlen), *) specifiers
print *, trim(springs)
call set3(springs)
val = 0
do
if (consistent(springs, n_springs, specifiers, n_specifiers)) then
val = val + 1
print *, trim(springs)
end if
if (no3(springs)) then
exit
end if
call iterate(springs, strlen)
end do
print *, "Valid: ", val
print *
total_valid = total_valid + val
deallocate(specifiers)
end do
close(10)
print *
print *, "Total valid: ", total_valid
contains
subroutine set3(springs)
character(*), intent(inout) :: springs
integer :: pos
do
pos = scan(springs, '?')
if (pos .eq. 0) then
exit
end if
springs(pos:pos) = '3'
end do
end subroutine
subroutine iterate(springs, nspr)
character(*), intent(inout) :: springs
integer, intent(in) :: nspr
integer :: p1, p2
p1 = 1
do
if (p1 .gt. nspr) then
exit
end if
p2 = scan(springs(p1:nspr), '3>')
if (p2 .eq. 0) then
exit
end if
p2 = p2 + p1 - 1
if (springs(p2:p2) .eq. '3') then
springs(p2:p2) = '>'
exit
else
springs(p2:p2) = '3'
! carry the '>'
p1 = p2 + 1
end if
end do
end subroutine
function no3(springs)
character(*), intent(in) :: springs
logical :: no3
no3 = (scan(springs, '3') .eq. 0)
end function no3
function consistent(springs, n_spr, specs, n_specs)
character(*), intent(in) ::springs
integer, intent(in) :: specs(:)
integer, intent(in) :: n_spr, n_specs
logical :: consistent
integer :: c1, c2, c3, i, speccur, clen
consistent = .true.
c1 = 1
speccur = 0
do i = 1, n_spr
if (c1 .gt. n_spr) then
consistent = speccur .eq. n_specs
! We've run out of springs
return
end if
c2 = scan(springs(c1:n_spr), '#3')
if (c2 .eq. 0) then
consistent = speccur .eq. n_specs
! Also run out of springs
return
end if
c2 = c1 + c2 - 1
c3 = verify(springs(c2:n_spr), '#3')
if (c3 .eq. 0) then
! Ends at end of string
c3 = n_spr
else
c3 = c2 + c3 - 2
end if
speccur = speccur + 1
if (speccur .gt. n_specs) then
consistent = .false.
return
end if
clen = c3 - c2 + 1
if (clen .ne. specs(speccur)) then
consistent = .false.
return
end if
c1 = c3 + 1
end do
print *, '???'
end function consistent
end program day12