feat: add day 3 2024 (iter crashes on solution 2)

runner.go

@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"flag"
 	"fmt"
+	"io"
 	"log"
 	"os"
 	"path/filepath"
@@ -16,7 +17,7 @@ import (
 var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to `file`")
 var memprofile = flag.String("memprofile", "", "write memory profile to `file`")
 
-func Runner[R any, F func(*bufio.Scanner) (R, error)](run F) (R, error) {
+func runnerFile[R any, F func(*os.File) (R, error)]() *os.File {
 	if len(os.Args) < 2 {
 		Log("Usage:", filepath.Base(os.Args[0]), "FILE")
 		os.Exit(22)
@@ -57,16 +58,20 @@ func Runner[R any, F func(*bufio.Scanner) (R, error)](run F) (R, error) {
 		}()
 	}
 
-
 	input, err := os.Open(inputFilename)
 	if err != nil {
 		Log(err)
 		os.Exit(1)
 	}
 
-	scan := bufio.NewScanner(input)
+	return input
+}
 
-	return run(scan)
+func Runner[R any, F func(*bufio.Scanner) (R, error)](run F) (R, error) {
+	return run(bufio.NewScanner(runnerFile[R]()))
+}
+func RunnerReader[R any, F func(io.Reader) (R, error)](run F) (R, error) {
+	return run(runnerFile[R]())
 }
 
 func MustResult[T any](result T, err error) {