day 10

10/10.2.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+// go run 10.2.go "input"
+
+func main() {
+
+	size := 256
+	appendList := []byte{17, 31, 73, 47, 23}
+
+	s := os.Args[1]
+	s = s + string(appendList)
+
+	list := make([]int, size)
+	for i := 0; i < size; i++ {
+		list[i] = i
+	}
+
+	pos := 0
+	skip := 0
+
+	for j := 0; j < 64; j++ {
+		for x := range s {
+
+			i := int(s[x])
+
+			// Reverse the section
+			r := i/2
+			fmt.Println("i:", i, "range:", r)
+			
+			for y := 0; y < r; y++ {
+				bottom := (pos+y) % size
+				top := (pos+i-y-1) % size
+
+				fmt.Println("pos:", pos, "i:", i, "y:", y, "bottom:", bottom, "top:", top)
+
+				tmp := list[bottom]
+				list[bottom] = list[top]
+				list[top] = tmp
+			}
+
+			pos = (pos+i+skip) % size
+			fmt.Println(pos, i, list)
+			skip++
+		}
+	}
+
+	for a:=0; a<16; a++ {
+
+		r := list[a*16]
+		for b:=1; b<16; b++ {
+			xorpos := (a*16)+b
+			//fmt.Println("xor:", xorpos, r, list[xorpos])
+			r = r ^ list[xorpos]
+		}
+
+		fmt.Printf("%x", r)
+		//fmt.Println(" ", r)
+	}
+	fmt.Println("")
+
+}

10/10.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	//"bufio"
+	"fmt"
+	"os"
+	"strings"
+	"strconv"
+)
+
+//  go run 10.go "n,n,n,n"
+
+func main() {
+
+	size := 256
+
+	s := strings.Split(os.Args[1], ",")
+	list := make([]int, size)
+
+	for i := 0; i < size; i++ {
+		list[i] = i
+	}
+
+	pos := 0
+	skip := 0
+
+	for x := range s {
+
+		i,_ := strconv.Atoi(s[x])
+
+		// Reverse the section
+		r := i/2
+		fmt.Println("i:", i, "range:", r)
+		
+		for y := 0; y < r; y++ {
+			bottom := (pos+y) % size
+			top := (pos+i-y-1) % size
+
+			fmt.Println("pos:", pos, "i:", i, "y:", y, "bottom:", bottom, "top:", top)
+
+			tmp := list[bottom]
+			list[bottom] = list[top]
+			list[top] = tmp
+		}
+
+		pos = (pos+i+skip) % size
+		fmt.Println(pos, i, list)
+		skip++
+	}
+	fmt.Println(list[0]*list[1])
+
+}