From 82f06213fb274cc2de9115b2340c5a234030c06c Mon Sep 17 00:00:00 2001 From: Gabriel Augendre Date: Sat, 9 Dec 2023 15:18:45 +0100 Subject: [PATCH] solve day 9 --- 2023/day06_boats.go | 6 +- 2023/day09_series.go | 75 ++++++++++++++ 2023/day09_series_test.go | 42 ++++++++ 2023/inputs/day09 | 200 ++++++++++++++++++++++++++++++++++++++ 2023/inputs/day09_test1 | 3 + 2023/inputs/day09_test2 | 0 6 files changed, 323 insertions(+), 3 deletions(-) create mode 100644 2023/day09_series.go create mode 100644 2023/day09_series_test.go create mode 100644 2023/inputs/day09 create mode 100644 2023/inputs/day09_test1 create mode 100644 2023/inputs/day09_test2 diff --git a/2023/day06_boats.go b/2023/day06_boats.go index a200c68..f1961b8 100644 --- a/2023/day06_boats.go +++ b/2023/day06_boats.go @@ -18,7 +18,7 @@ func Day06Part1(input io.Reader) (int, error) { margin := 1 for i := 0; i < len(times); i++ { - x1, x2 := zeros(times[i], distances[i]) + x1, x2 := day06Zeros(times[i], distances[i]) if distance(x1, times[i]) <= distances[i] { x1++ } @@ -28,7 +28,7 @@ func Day06Part1(input io.Reader) (int, error) { return margin, nil } -func zeros(time, distance int) (int, int) { +func day06Zeros(time, distance int) (int, int) { t, d := float64(time), float64(distance) delta := math.Sqrt(math.Pow(t, 2) - 4*d) return int(math.Ceil((t - delta) / 2)), int(math.Ceil((t + delta) / 2)) @@ -49,7 +49,7 @@ func Day06Part2(input io.Reader) (int, error) { margin := 1 for i := 0; i < len(times); i++ { - x1, x2 := zeros(times[i], distances[i]) + x1, x2 := day06Zeros(times[i], distances[i]) if distance(x1, times[i]) <= distances[i] { x1++ } diff --git a/2023/day09_series.go b/2023/day09_series.go new file mode 100644 index 0000000..42079af --- /dev/null +++ b/2023/day09_series.go @@ -0,0 +1,75 @@ +package _023 + +import ( + "bufio" + "io" + "slices" +) + +func Day09Part1(input io.Reader) (int, error) { + scanner := bufio.NewScanner(input) + + sum := 0 + for scanner.Scan() { + line := lineToInts(scanner.Text()) + diffs := [][]int{line} + for !day09AllZeros(line) { + line = day09Difference(line) + diffs = append(diffs, line) + } + lenDiffs := len(diffs) + diffs[lenDiffs-1] = append(diffs[lenDiffs-1], 0) // add a zero to the zeros list + for i := lenDiffs - 2; i >= 0; i-- { //starting with the last non 0 + current := diffs[i] + prev := diffs[i+1] + current = append(current, current[len(current)-1]+prev[len(prev)-1]) + diffs[i] = current + } + sum += diffs[0][len(diffs[0])-1] + } + + return sum, nil +} + +func day09Difference(line []int) []int { + diff := make([]int, len(line)-1) + for i := 0; i < len(line)-1; i++ { + diff[i] = line[i+1] - line[i] + } + return diff +} + +func day09AllZeros(line []int) bool { + for _, d := range line { + if d != 0 { + return false + } + } + return true +} + +func Day09Part2(input io.Reader) (int, error) { + scanner := bufio.NewScanner(input) + + sum := 0 + for scanner.Scan() { + line := lineToInts(scanner.Text()) + slices.Reverse(line) + diffs := [][]int{line} + for !day09AllZeros(line) { + line = day09Difference(line) + diffs = append(diffs, line) + } + lenDiffs := len(diffs) + diffs[lenDiffs-1] = append(diffs[lenDiffs-1], 0) // add a zero to the zeros list + for i := lenDiffs - 2; i >= 0; i-- { //starting with the last non 0 + current := diffs[i] + prev := diffs[i+1] + current = append(current, current[len(current)-1]+prev[len(prev)-1]) + diffs[i] = current + } + sum += diffs[0][len(diffs[0])-1] + } + + return sum, nil +} diff --git a/2023/day09_series_test.go b/2023/day09_series_test.go new file mode 100644 index 0000000..de14d30 --- /dev/null +++ b/2023/day09_series_test.go @@ -0,0 +1,42 @@ +package _023 + +import ( + "fmt" + "github.com/stretchr/testify/assert" + "testing" +) + +func TestDay09Part1(t *testing.T) { + tests := []testCase{ + {"inputs/day09_test1", 114}, + {"inputs/day09", 1904165718}, + } + for _, test := range tests { + t.Run(test.filename, check(test, Day09Part1)) + } +} + +func TestDay09Part2(t *testing.T) { + tests := []testCase{ + {"inputs/day09_test1", 2}, + {"inputs/day09", 964}, + } + for _, test := range tests { + t.Run(test.filename, check(test, Day09Part2)) + } +} + +func Test_day09Difference(t *testing.T) { + tests := []struct { + line []int + want []int + }{ + {[]int{0, 3, 6, 9, 12, 15}, []int{3, 3, 3, 3, 3}}, + {[]int{1, 3, 6, 10, 15, 21}, []int{2, 3, 4, 5, 6}}, + } + for _, tt := range tests { + t.Run(fmt.Sprint(tt.line), func(t *testing.T) { + assert.Equalf(t, tt.want, day09Difference(tt.line), "day09Difference(%v)", tt.line) + }) + } +} diff --git a/2023/inputs/day09 b/2023/inputs/day09 new file mode 100644 index 0000000..be75c4a --- /dev/null +++ b/2023/inputs/day09 @@ -0,0 +1,200 @@ +1 2 5 13 33 89 245 643 1565 3535 7495 15128 29479 56181 105913 199391 377649 723582 1407901 2788593 5627669 +18 37 79 153 277 493 883 1592 2876 5211 9525 17649 33125 62564 117833 219509 402350 724133 1280307 2228813 3832565 +0 -9 -18 -18 16 148 529 1485 3668 8317 17736 36227 71969 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