From 3dd7a42797dfe14f198448adf0f68d4fea01d87e Mon Sep 17 00:00:00 2001 From: Petra Date: Thu, 14 Dec 2023 21:34:26 +1300 Subject: [PATCH] 2023 Day 14 Note off-by-one for cycle numbering in part 2 --- 2023/Makefile | 2 +- 2023/data/day14.txt | 101 ++++++++++++++++++++ 2023/data/day14ex1.txt | 10 ++ 2023/src/day14.f90 | 74 ++++++++++++++ 2023/src/day14b.f90 | 212 +++++++++++++++++++++++++++++++++++++++++ 5 files changed, 398 insertions(+), 1 deletion(-) create mode 100644 2023/data/day14.txt create mode 100644 2023/data/day14ex1.txt create mode 100644 2023/src/day14.f90 create mode 100644 2023/src/day14b.f90 diff --git a/2023/Makefile b/2023/Makefile index f5a7c6a..f198555 100644 --- a/2023/Makefile +++ b/2023/Makefile @@ -2,7 +2,7 @@ FC:=gfortran FFLAGS:=-Wall -Wno-maybe-uninitialized -O2 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 ./bin/day12.bin ./bin/day13.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 ./bin/day13.bin ./bin/day14.bin ./bin/day14b.bin all: aoc19 diff --git a/2023/data/day14.txt b/2023/data/day14.txt new file mode 100644 index 0000000..660b5a3 --- /dev/null +++ b/2023/data/day14.txt @@ -0,0 +1,101 @@ +O...O..###.#..#O...###.......#....O#.O...O....#.O...O..O..##.O.O#...O........O...#.#.O...O#O.......# +...O#..#O...#....O..###.O.....#......#.OO.O#..#.O..##...#....##...#.O....##O##OOO..#.O..OOOO..#..#.# +...##.OOOOO#.OO....OO#O.###.O..O...OO.......O....O...OO##....#..O.....#O#.O.O.#O..O.##....##.#.OOOO# 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diff --git a/2023/src/day14.f90 b/2023/src/day14.f90 new file mode 100644 index 0000000..601e278 --- /dev/null +++ b/2023/src/day14.f90 @@ -0,0 +1,74 @@ +program day14 + implicit none + integer, parameter :: max_chars = 300 + integer, parameter :: max_rows = 300 + character(200) :: fname + character(max_chars) :: fline + integer :: n_arguments + integer :: istat + character(len=max_chars) :: map(1:max_rows) + character(len=1) :: cchar + integer :: rows, cols, strlen + integer :: i, i2, i3, tot_weight, tweight + logical :: rest + + 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) + rows = 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 + rows = rows + 1 + map(rows) = fline + end do + cols = len_trim(map(1)) + + tot_weight = 0 + print *, "Starting position:" + do i3=1,rows + print *, trim(map(i3)) + end do + print * + do i=1,rows + do i2=1,cols + if (map(i)(i2:i2) .eq. 'O') then + map(i)(i2:i2) = '.' + rest = .false. + if (i .gt. 1) then + do i3=i-1,1,-1 + cchar = map(i3)(i2:i2) + if (cchar .ne. '.') then + map(i3+1)(i2:i2) = 'O' + tweight = rows - i3 + rest = .true. + exit + end if + end do + end if + if (.not. rest) then + map(1)(i2:i2) = 'O' + tweight = rows + end if + tot_weight = tot_weight + tweight + end if + end do + end do + print *, "End position:" + do i3=1,rows + print *, trim(map(i3)) + end do + print * + print *, "Total weighting: ", tot_weight +end program day14 + diff --git a/2023/src/day14b.f90 b/2023/src/day14b.f90 new file mode 100644 index 0000000..70c6a7d --- /dev/null +++ b/2023/src/day14b.f90 @@ -0,0 +1,212 @@ +program day14 + implicit none + integer, parameter :: max_chars = 300 + integer, parameter :: max_rows = 300 + integer, parameter :: max_cycles = 200 + integer, parameter :: cycle_est = 1000000001 + character(200) :: fname + character(max_chars) :: fline + integer :: n_arguments + integer :: istat + character(len=max_chars) :: map(1:max_rows), map_prev(1:max_rows) + character(len=max_chars) :: metamap(1:max_cycles, 1:max_rows) + integer :: rows, cols, strlen + integer :: i, i2, cycles + logical :: eq, f_match + integer :: match_c1, match_c2, cycle_eqv, weight + + 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) + rows = 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 + rows = rows + 1 + map(rows) = fline + end do + cols = len_trim(map(1)) + + metamap(1,:) = map + f_match = .false. + do cycles=1,max_cycles-1 + map_prev = metamap(cycles, :) + call cyce(map_prev, map, rows, cols) + metamap(cycles+1, :) = map + do i2=1, cycles + map_prev = metamap(i2, :) + eq = all_eq(metamap(i2, :), map, rows) + if (eq) then + if (.not. f_match) then + f_match = .true. + match_c1 = i2 + match_c2 = cycles+1 + end if + print *, "Match: ", i2, cycles+1 + exit + end if + end do + if (f_match) then + exit + end if + end do + print * + if (f_match) then + print *, "Found match! ", match_c1, match_c2 + print *, "Cycle length: ", match_c2 - match_c1 + cycle_eqv = mod(cycle_est - match_c1, match_c2 - match_c1) + match_c1 + print *, "Cycle equivalency: ", cycle_est, cycle_eqv + weight = cal_weight(metamap(cycle_eqv, :), rows, cols) + print *, "Weight: ", weight + else + print *, "Did not find match after ", max_cycles, " cycles" + end if + + contains + subroutine cyce(initial, cycled, rows, cols) + implicit none + character(len=max_chars), intent(in) :: initial(:) + character(len=max_chars), intent(out) :: cycled(:) + integer, intent(in) :: rows, cols + integer :: i, i2, i3 + logical :: rest + character(len=1) :: cchar + ! Copy + do i=1,rows + cycled(i) = initial(i) + end do + ! Roll North + do i=1,rows + do i2=1,cols + if (map(i)(i2:i2) .eq. 'O') then + map(i)(i2:i2) = '.' + rest = .false. + if (i .gt. 1) then + do i3=i-1,1,-1 + cchar = map(i3)(i2:i2) + if (cchar .ne. '.') then + map(i3+1)(i2:i2) = 'O' + rest = .true. + exit + end if + end do + end if + if (.not. rest) then + map(1)(i2:i2) = 'O' + end if + end if + end do + end do + ! Roll West + do i2=1,cols + do i=1,rows + if (map(i)(i2:i2) .eq. 'O') then + map(i)(i2:i2) = '.' + rest = .false. + if (i2 .gt. 1) then + do i3=i2-1,1,-1 + cchar = map(i)(i3:i3) + if (cchar .ne. '.') then + map(i)(i3+1:i3+1) = 'O' + rest = .true. + exit + end if + end do + end if + if (.not. rest) then + map(i)(1:1) = 'O' + end if + end if + end do + end do + ! Roll South + do i=rows,1,-1 + do i2=1,cols + if (map(i)(i2:i2) .eq. 'O') then + map(i)(i2:i2) = '.' + rest = .false. + if (i .lt. rows) then + do i3=i+1,rows + cchar = map(i3)(i2:i2) + if (cchar .ne. '.') then + map(i3-1)(i2:i2) = 'O' + rest = .true. + exit + end if + end do + end if + if (.not. rest) then + map(rows)(i2:i2) = 'O' + end if + end if + end do + end do + ! Roll East + do i2=cols, 1, -1 + do i=1,rows + if (map(i)(i2:i2) .eq. 'O') then + map(i)(i2:i2) = '.' + rest = .false. + if (i2 .lt. cols) then + do i3=i2+1,cols + cchar = map(i)(i3:i3) + if (cchar .ne. '.') then + map(i)(i3-1:i3-1) = 'O' + rest = .true. + exit + end if + end do + end if + if (.not. rest) then + map(i)(cols:cols) = 'O' + end if + end if + end do + end do + end subroutine cyce + + function all_eq(initial, cycled, rows) + implicit none + character(len=max_chars), intent(in) :: initial(:), cycled(:) + integer, intent(in) :: rows + integer :: i + logical :: all_eq + all_eq = .true. + do i=1,rows + if (trim(initial(i)) .ne. trim(cycled(i))) then + all_eq = .false. + !print *, trim(initial(i)) + !print *, trim(cycled(i)) + return + end if + end do + end function all_eq + + function cal_weight(map, rows, cols) + implicit none + character(len=max_chars), intent(in) :: map(:) + integer, intent(in) :: rows, cols + integer :: cal_weight + integer :: i, i2 + cal_weight = 0 + do i=1,rows + do i2=1,cols + if (map(i)(i2:i2) .eq. 'O') then + cal_weight = cal_weight + (rows - i) + 1 + end if + end do + end do + end function cal_weight +end program day14 + +