From 67498cd5d0d0c082f4399b41121fd2dff85c7e8a Mon Sep 17 00:00:00 2001
From: tiennm99 <tiennm99@outlook.com>
Date: Mon, 1 Dec 2025 21:26:59 +0700
Subject: [PATCH] feat(2025): add day 1 part1

---
 .gitignore          |  4 ++++
 2025/day/1/part1.go | 33 +++++++++++++++++++++++++++++++++
 go.mod              |  3 +++
 3 files changed, 40 insertions(+)
 create mode 100644 2025/day/1/part1.go
 create mode 100644 go.mod

diff --git a/.gitignore b/.gitignore
index aaadf73..089a213 100644
--- a/.gitignore
+++ b/.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
 #
diff --git a/2025/day/1/part1.go b/2025/day/1/part1.go
new file mode 100644
index 0000000..747e085
--- /dev/null
+++ b/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)
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..567358a
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/tiennm99/adventofcode
+
+go 1.23.4