Restyled README and file structure

Signed-off-by: Ettore Dreucci <ettore.dreucci@gmail.com>

2018/day_04/main.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+type guard struct {
+	timeCard [60]int
+}
+
+func printSchedule(guardsSchedule map[int]guard) {
+	fmt.Print("ID\t")
+	for i := 0; i < 60; i++ {
+		fmt.Printf("%v ", i)
+	}
+	fmt.Print("\tSUM\n")
+	for i, g := range guardsSchedule {
+		sum := 0
+		fmt.Printf("%v\t", i)
+		for i, t := range g.timeCard {
+			sum += t
+			if i < 59 && i > 8 && g.timeCard[i+1] < 10 {
+				fmt.Printf("%v  ", t)
+			} else {
+				fmt.Printf("%v ", t)
+			}
+		}
+		fmt.Printf("\t%v\n", sum)
+	}
+}
+
+func main() {
+	var lines []string
+	guardsSchedule := make(map[int]guard)
+
+	file, err := os.Open("./input")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	scan := bufio.NewScanner(file)
+	for scan.Scan() {
+		lines = append(lines, scan.Text())
+	}
+
+	sort.Strings(lines)
+
+	currentGuardID := -1
+	sleepTime := 0
+	wakeTime := 0
+	for _, line := range lines {
+		if strings.Contains(line, "Guard") {
+			currentGuardID, _ = strconv.Atoi(strings.Split(strings.Split(line, "#")[1], " ")[0])
+			_, exists := guardsSchedule[currentGuardID]
+			if !exists {
+				guardsSchedule[currentGuardID] = *new(guard)
+			}
+		} else if strings.Contains(line, "falls asleep") {
+			st, _ := strconv.Atoi(strings.Split(strings.Split(strings.Split(line, "]")[0], " ")[1], ":")[1])
+			sleepTime = st
+		} else if strings.Contains(line, "wakes up") {
+			wt, _ := strconv.Atoi(strings.Split(strings.Split(strings.Split(line, "]")[0], " ")[1], ":")[1])
+			wakeTime = wt
+			timeSchedule := guardsSchedule[currentGuardID]
+			for j := sleepTime; j < wakeTime; j++ {
+				timeSchedule.timeCard[j]++
+			}
+			guardsSchedule[currentGuardID] = timeSchedule
+		}
+	}
+
+	mostAsleepTime := -1
+	mostAsleepID := -1
+	for i, g := range guardsSchedule {
+		sum := 0
+		for _, t := range g.timeCard {
+			sum += t
+		}
+		if sum > mostAsleepTime {
+			mostAsleepTime = sum
+			mostAsleepID = i
+		}
+	}
+
+	mostAsleepMinute := -1
+	max := -1
+	for i, t := range guardsSchedule[mostAsleepID].timeCard {
+		if t > max {
+			max = t
+			mostAsleepMinute = i
+		}
+	}
+	fmt.Printf("Part One: %v\n", mostAsleepMinute*mostAsleepID)
+
+	mostAsleepMinute = -1
+	max = -1
+	mostAsleepID = -1
+	for i, g := range guardsSchedule {
+		for j, t := range g.timeCard {
+			if t > max {
+				max = t
+				mostAsleepMinute = j
+				mostAsleepID = i
+			}
+		}
+	}
+	fmt.Printf("Part Two: %v\n", mostAsleepMinute*mostAsleepID)
+}