Combine AoC Repos

2016/day12/main.go

@@ -0,0 +1,78 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+var regs = map[string]int{
+	"a": 0,
+	"b": 0,
+	"c": 1,
+	"d": 0,
+}
+
+func main() {
+	input := stdinToStringSlice()
+	curr := 0
+	for curr < len(input) {
+		ins := strings.Fields(input[curr])
+		curr++
+		switch ins[0] {
+		case "cpy":
+			src := ins[1]
+			dst := ins[2]
+			// check if the src is a register
+			if v, ok := regs[src]; ok {
+				regs[dst] = v
+			} else {
+				// It's not, must be an int
+				regs[dst] = atoi(src)
+			}
+		case "inc":
+			regs[ins[1]] = regs[ins[1]] + 1
+		case "dec":
+			regs[ins[1]] = regs[ins[1]] - 1
+		case "jnz":
+			v, ok := regs[ins[1]]
+			if !ok {
+				v = atoi(ins[1])
+			}
+			if v != 0 {
+				// Subtract 1 from the jump because we incremented already
+				curr += atoi(ins[2]) - 1
+			}
+		}
+	}
+	PrintState()
+}
+
+// Fancy State Printing
+func PrintState() {
+	datLine := fmt.Sprint("\u2502  a:", regs["a"], "  b:", regs["b"], "  c:", regs["c"], "  d:", regs["d"], "  \u2502")
+	fmt.Println("\u250C" + strings.Repeat("\u2500", len(datLine)-6) + "\u2510")
+	fmt.Println(datLine)
+	fmt.Println("\u2514" + strings.Repeat("\u2500", len(datLine)-6) + "\u2518")
+}
+
+func stdinToStringSlice() []string {
+	var input []string
+	scanner := bufio.NewScanner(os.Stdin)
+	for scanner.Scan() {
+		input = append(input, scanner.Text())
+	}
+	return input
+}
+
+func atoi(i string) int {
+	var ret int
+	var err error
+	if ret, err = strconv.Atoi(i); err != nil {
+		log.Fatal("Invalid Atoi:" + i)
+	}
+	return ret
+}