day 10

10/main.go

@@ -0,0 +1,111 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func mustAtoi(line string) int {
+	i, _ := strconv.Atoi(line)
+	return i
+}
+
+func main() {
+	start := time.Now()
+	partOne()
+	duration := time.Since(start)
+	partTwo()
+	duration2 := time.Since(start)
+	fmt.Printf("p1: %s, p2: %s\n", duration, duration2-duration)
+}
+
+func makeScanner(test bool) *bufio.Scanner {
+	var f *os.File
+	if test {
+		f, _ = os.Open("inputs/testinput")
+	} else {
+		f, _ = os.Open("inputs/input")
+	}
+	reader := bufio.NewReader(f)
+	return bufio.NewScanner(reader)
+}
+
+func partOne() {
+	scanner := makeScanner(false)
+
+	register := 1
+	cycleCount := 0
+	signalStrength := 0
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		switch {
+		case line == "noop":
+			cycleCount++
+			if cycleCount%40 == 20 {
+				signalStrength += (cycleCount) * register
+			}
+		default:
+			s := strings.Split(line, " ")
+			x := mustAtoi(s[1])
+			cycleCount++
+			if cycleCount%40 == 20 {
+				signalStrength += (cycleCount) * register
+			}
+			cycleCount++
+			if cycleCount%40 == 20 {
+				signalStrength += (cycleCount) * register
+			}
+			register += x
+		}
+	}
+	fmt.Println(signalStrength)
+}
+
+func partTwo() {
+	scanner := makeScanner(false)
+
+	screen := make([]string, 241)
+
+	register := 1
+	cycleCount := 0
+
+	for scanner.Scan() {
+		line := scanner.Text()
+		switch {
+		case line == "noop":
+			if register == cycleCount%40 || register-1 == cycleCount%40 || register+1 == cycleCount%40 {
+				screen[cycleCount] = "#"
+			} else {
+				screen[cycleCount] = "."
+			}
+			cycleCount++
+		default:
+			s := strings.Split(line, " ")
+			x := mustAtoi(s[1])
+			if register == cycleCount%40 || register-1 == cycleCount%40 || register+1 == cycleCount%40 {
+				screen[cycleCount] = "#"
+			} else {
+				screen[cycleCount] = "."
+			}
+			cycleCount++
+			if register == cycleCount%40 || register-1 == cycleCount%40 || register+1 == cycleCount%40 {
+				screen[cycleCount] = "#"
+			} else {
+				screen[cycleCount] = "."
+			}
+			cycleCount++
+			register += x
+		}
+	}
+	fmt.Println(screen[1:40])
+	fmt.Println(screen[41:80])
+	fmt.Println(screen[81:120])
+	fmt.Println(screen[121:160])
+	fmt.Println(screen[161:200])
+	fmt.Println(screen[201:240])
+}

10/main.rs

@@ -0,0 +1,38 @@
+#![allow(dead_code)]
+use std::fs::File;
+use std::io;
+use std::io::BufRead;
+use std::path::Path;
+use std::time::Instant;
+
+fn main() {
+    let now = Instant::now();
+    part_one();
+    let part_one_duration = now.elapsed();
+    part_two();
+    let part_two_duration = now.elapsed();
+    println!(
+        "p1: {}ms, p2: {}ms",
+        part_one_duration.as_millis(),
+        (part_two_duration - part_one_duration).as_millis()
+    );
+}
+
+fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
+where
+    P: AsRef<Path>,
+{
+    // note that this discards a final newline
+    let file = File::open(filename)?;
+    Ok(io::BufReader::new(file).lines())
+}
+
+fn part_one() {
+    if let Ok(lines) = read_lines("./inputs/input") {
+        for line in lines {
+            // do stuff
+        }
+    }
+}
+
+fn part_two() {}