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base: xuu:16a9afb2cbb1478ef7a259b9e7557a664a93f963
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xuu:main
xuu:working2024D3
xuu:hackerrank
xuu:day23
xuu:graphs
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compare: xuu:1045fcba4cc7caba9470910938c6a7dcb4a48864
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xuu:main
xuu:working2024D3
xuu:hackerrank
xuu:day23
xuu:graphs

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day09/example.txt
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11 12 8 -7 -28 -26 65 361 1041 2360 4662 8393 14114 22514 34423 50825 72871 101892 139412 187161 247088
6 6 19 54 113 189 264 307 272 96 -303 -1028 -2205 -3985 -6546 -10095 -14870 -21142 -29217 -39438 -52187
26 40 63 112 222 455 906 1708 3036 5116 8278 13187 21602 38439 76677 167925 383519 874229 1941697 4162964 8603981
12 19 31 58 110 209 412 843 1741 3551 7128 14215 28539 58216 120779 253209 531098 1103839 2256973 4519124 8840092
14 28 47 71 102 153 266 539 1162 2462 4957 9419 16946 29043 47712 75551 115862 172768 251339 357727 499310
19 22 38 89 208 457 958 1941 3833 7447 14380 27796 53861 104226 200137 378978 704206 1279303 2264473 3888958 6437241
20 38 83 177 353 665 1204 2120 3650 6152 10145 16355 25767 39683 59786 88210 127616 181274 253151 348005 471485
18 33 52 75 103 147 258 596 1573 4137 10313 24197 53757 114135 233848 466630 914030 1767831 3387708 6439669 12137157
16 32 61 98 136 164 171 173 281 836 2678 7743 20501 51456 125378 299753 704238 1621680 3648963 8007452 17127734
0 9 25 62 141 293 566 1037 1844 3286 6097 12096 25583 56164 124287 271914 582905 1221701 2506400 5046590 10003946
-4 12 56 141 280 486 772 1151 1636 2240 2976 3857 4896 6106 7500 9091 10892 12916 15176 17685 20456

141
day09/main.go
View File

@ -1,141 +0,0 @@
package main
import (
"bufio"
"cmp"
"fmt"
"strconv"
"strings"
aoc "go.sour.is/advent-of-code-2023"
)
func main() { aoc.MustResult(aoc.Runner(run)) }
type result struct {
valuePT1 int
valuePT2 int
}
func (r result) String() string { return fmt.Sprintf("%#v", r) }
var log = aoc.Log
func run(scan *bufio.Scanner) (*result, error) {
var histories [][]int
var values []int
var rvalues []int
for scan.Scan() {
text := scan.Text()
if len(text) == 0 {
continue
}
histories = append(histories, nil)
for _, s := range strings.Fields(text) {
if i, err := strconv.Atoi(s); err == nil {
histories[len(histories)-1] = append(histories[len(histories)-1], i)
}
}
log(last(histories...))
values = append(values, predictNext(last(histories...)))
rvalues = append(rvalues, predictPrev(last(histories...)))
}
log("values", values)
log("rvalues", rvalues)
return &result{valuePT1: sum(values...), valuePT2: sum(rvalues...)}, nil
}
func predictNext(in []int) int {
log(" ---- PREDICT NEXT ----")
defer log(" ----------------------")
history := makeHistory(in)
aoc.Reverse(history)
return predict(history, func(a, b int) int { return a + b })
}
func predictPrev(in []int) int {
log(" ---- PREDICT PREV ----")
defer log(" ----------------------")
history := makeHistory(in)
for i := range history {
aoc.Reverse(history[i])
}
aoc.Reverse(history)
return predict(history, func(a, b int) int { return b - a })
}
func predict(history [][]int, diff func(a, b int) int) int {
log(" ---- PREDICT ----")
defer log(" -----------------")
for i := range history[1:] {
lastHistory, curHistory := last(history[i]...), last(history[i+1]...)
history[i+1] = append(history[i+1], diff(lastHistory, curHistory))
log(lastHistory, curHistory, last(history[i+1]))
}
log("last", last(history...))
return last(last(history...)...)
}
func makeHistory(in []int) [][]int {
var history [][]int
history = append(history, in)
for {
var diffs []int
current := history[len(history)-1]
for i := range current[1:] {
diffs = append(diffs, current[i+1]-current[i])
}
history = append(history, diffs)
log(diffs)
if max(diffs[0], diffs[1:]...) == 0 && min(diffs[0], diffs[1:]...) == 0 {
break
}
}
return history
}
func max[T cmp.Ordered](a T, v ...T) T {
for _, b := range v {
if b > a {
a = b
}
}
return a
}
func min[T cmp.Ordered](a T, v ...T) T {
for _, b := range v {
if b < a {
a = b
}
}
return a
}
func sum[T cmp.Ordered](v ...T) T {
var s T
for _, a := range v {
s += a
}
return s
}
func last[T any](v ...T) T {
return v[len(v)-1]
}

44
day09/main_test.go
View File

@ -1,44 +0,0 @@
package main
import (
"bufio"
"bytes"
_ "embed"
"testing"
"github.com/matryer/is"
)
//go:embed example.txt
var example []byte
//go:embed input.txt
var input []byte
func TestExample(t *testing.T) {
is := is.New(t)
scan := bufio.NewScanner(bytes.NewReader(example))
result, err := run(scan)
is.NoErr(err)
t.Log(result)
is.Equal(result.valuePT1, int(114))
is.Equal(result.valuePT2, 2)
}
func TestInput(t *testing.T) {
is := is.New(t)
scan := bufio.NewScanner(bytes.NewReader(input))
result, err := run(scan)
is.NoErr(err)
t.Log(result.valuePT1)
is.Equal(result.valuePT1, int(1806615041))
t.Log(result.valuePT2)
is.True(result.valuePT2 < 1806615046) // first attempt
is.Equal(result.valuePT2, 1211)
}

12
tools.go
View File

@ -4,13 +4,12 @@ import (
"bufio"
"fmt"
"os"
"path/filepath"
"strings"
)
func Runner[R any, F func(*bufio.Scanner) (R, error)](run F) (R, error) {
if len(os.Args) != 2 {
Log("Usage:", filepath.Base(os.Args[0]), "FILE")
Log("Usage:", os.Args[0], "FILE")
os.Exit(22)
}
@ -24,15 +23,6 @@ func Runner[R any, F func(*bufio.Scanner) (R, error)](run F) (R, error) {
return run(scan)
}
func MustResult[T any](result T, err error) {
if err != nil {
fmt.Println("ERR", err)
os.Exit(1)
}
Log("result", result)
}
func Log(v ...any) { fmt.Fprintln(os.Stderr, v...) }
func Logf(format string, v ...any) {
if !strings.HasSuffix(format, "\n") {