Day 10

day09/common/bridge.go

@@ -1,8 +1,8 @@
 package common
 
 import (
-	"bufio"
-	"strconv"
+  "bufio"
+  "strconv"
 )
 
 

day10/common/cpu.go

@@ -0,0 +1,95 @@
+package common
+
+import (
+  "bufio"
+  "strconv"
+)
+
+
+type CPU struct {
+  registers map[string]int
+}
+
+func NewCPU() *CPU {
+  return &CPU{map[string]int{"X": 1}}
+}
+
+func (cpu CPU) GetRegisterValue(r string) int {
+  return cpu.registers[r]
+}
+
+
+type Instruction interface {
+  ExecuteCycle(*CPU) bool
+}
+
+
+type NoOp struct {
+  currentCycle int
+}
+
+func NewNoOp() *NoOp {
+  return &NoOp{}
+}
+
+func (instruction *NoOp) ExecuteCycle(cpu *CPU) bool {
+  instruction.currentCycle++
+  return instruction.currentCycle == 1
+}
+
+
+type AddX struct {
+  parameter int
+  currentCycle int
+}
+
+func NewAddX(parameter int) *AddX {
+  return &AddX{parameter: parameter, currentCycle: 0}
+}
+
+func (instruction *AddX) ExecuteCycle(cpu *CPU) bool {
+  instruction.currentCycle++
+  if instruction.currentCycle == 2 {
+    cpu.registers["X"] += instruction.parameter
+    return true
+  } else {
+    return false
+  }
+}
+
+
+type Program struct {
+  instructions []Instruction
+  currentInstruction int
+}
+
+func (program *Program) ExecuteCycles(cpu *CPU, nCycles int) bool {
+  for i := 0; i < nCycles && program.currentInstruction < len(program.instructions); i++ {
+    done := program.instructions[program.currentInstruction].ExecuteCycle(cpu)
+    if done {
+      program.currentInstruction++
+    }
+  }
+  return program.currentInstruction == len(program.instructions)
+}
+
+
+func Parse(scanner bufio.Scanner) Program {
+  program := Program{}
+
+  for scanner.Scan() {
+    line := scanner.Text()
+
+    var instruction Instruction
+    switch line[0:4] {
+      case "noop":
+        instruction = NewNoOp()
+      case "addx":
+        value, _ := strconv.Atoi(line[5:])
+        instruction = NewAddX(value)
+    }
+    program.instructions = append(program.instructions, instruction)
+  }
+
+  return program
+}

day10/ex1/main.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+  "bufio"
+  "fmt"
+  "os"
+  "aoc2022/day10/common"
+)
+
+func main() {
+  program := common.Parse(*bufio.NewScanner(os.Stdin))
+  cpu := common.NewCPU()
+  strength := 0
+
+  program.ExecuteCycles(cpu, 19)
+  strength += cpu.GetRegisterValue("X") * 20
+  for i := 1; i <= 5; i ++ {
+    program.ExecuteCycles(cpu, 40)
+    strength += cpu.GetRegisterValue("X") * (20 + i*40)
+  }
+
+  fmt.Println(strength)
+}

day10/ex2/main.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"aoc2022/day10/common"
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func main() {
+  program := common.Parse(*bufio.NewScanner(os.Stdin))
+  cpu := common.NewCPU()
+  screen := [240]rune{}
+  i := 0
+  done := false
+
+  for !done {
+    xValue := cpu.GetRegisterValue("X")
+    if xValue >= (i % 40) - 1 && xValue <= (i % 40) + 1 {
+      screen[i] = '#'
+    } else {
+      screen[i] = '.'
+    }
+    done = program.ExecuteCycles(cpu, 1)
+    i = (i + 1) % 240
+  }
+
+  for i := 0; i < 6; i++ {
+    for j := 0; j < 40; j++ {
+      fmt.Print(string(screen[i*40+j]))
+    }
+    fmt.Println()
+  }
+}