feat(2025): add day 1 part1

.gitignore

@@ -1,3 +1,7 @@
+.idea
+
+
+
 # If you prefer the allow list template instead of the deny list, see community template:
 # https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
 #

2025/day/1/part1.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func main() {
+	file, _ := os.Open("input.txt")
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	current := 50
+	counter := 0
+	for scanner.Scan() {
+		line := scanner.Text()
+		direction := line[0]
+		multiplier := 1
+		if direction == 'L' {
+			multiplier = -1
+		}
+		number, _ := strconv.Atoi(line[1:])
+		current += number * multiplier
+		current = ((current % 100) + 100) % 100
+		if current == 0 {
+			counter++
+		}
+		// fmt.Printf("%s %c %d %d %d %d\n", line, direction, number, multiplier, current, counter)
+	}
+	fmt.Printf("%d\n", counter)
+}

go.mod

@@ -0,0 +1,3 @@
+module github.com/tiennm99/adventofcode
+
+go 1.23.4