Combine AoC Repos

2015/day07/main.go

@@ -0,0 +1,114 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"strconv"
+	"strings"
+)
+
+var wires map[string]uint16
+
+func main() {
+	var input []string
+	var bldInput string
+	var readInp string
+	for {
+		_, err := fmt.Scan(&readInp)
+		if err != nil {
+			if err != io.EOF {
+				log.Fatal(err)
+			}
+			break
+		}
+		if strings.HasSuffix(bldInput, "->") {
+			bldInput = bldInput + " " + readInp
+			input = append(input, bldInput)
+			bldInput = ""
+			continue
+		}
+		if len(bldInput) > 0 {
+			bldInput += " "
+		}
+		bldInput = bldInput + readInp
+	}
+
+	wires = make(map[string]uint16)
+	var done bool
+	for !done {
+		for i := range input {
+			parsePts := strings.Split(input[i], " -> ")
+			inputs := parsePts[0]
+			output := parsePts[1]
+			if _, ok := getValue(output); ok {
+				// We've already done this one
+				continue
+			}
+			// What's up with these inputs?
+			inpParts := strings.Split(inputs, " ")
+			if len(inpParts) == 1 {
+				if val, ok := getValue(inpParts[0]); ok {
+					setValue(output, val)
+				} else {
+					continue
+				}
+			} else if len(inpParts) == 2 {
+				if val, ok := getValue(inpParts[1]); ok {
+					setValue(output, ^val)
+				} else {
+					continue
+				}
+			} else {
+				// All other gates
+				var inp1, inp2 uint16
+				if val, ok := getValue(inpParts[0]); ok {
+					inp1 = val
+				} else {
+					continue
+				}
+				if val, ok := getValue(inpParts[2]); ok {
+					inp2 = val
+				} else {
+					continue
+				}
+
+				if inpParts[1] == "RSHIFT" {
+					setValue(output, (inp1 >> inp2))
+				} else if inpParts[1] == "LSHIFT" {
+					setValue(output, (inp1 << inp2))
+				} else if inpParts[1] == "OR" {
+					setValue(output, (inp1 | inp2))
+				} else if inpParts[1] == "AND" {
+					setValue(output, (inp1 & inp2))
+				}
+			}
+			if len(wires) == len(input) {
+				done = true
+			}
+		}
+
+		if aWire, ok := wires["a"]; ok {
+			fmt.Printf("\"a\" value: %d\n", aWire)
+			done = true
+		}
+	}
+}
+
+func setValue(key string, val uint16) {
+	wires[key] = val
+}
+
+func getValue(input string) (uint16, bool) {
+	var ret uint16
+	var i int
+	var err error
+	if i, err = strconv.Atoi(input); err != nil {
+		if w, ok := wires[input]; ok {
+			return w, true
+		}
+		return wires[input], false
+	}
+	ret = uint16(i)
+	return ret, true
+}