From 057acf84565cc22921f7344920416cb8d180381d Mon Sep 17 00:00:00 2001
From: Zhongheng Liu <z.liu@outlook.com.gr>
Date: Wed, 11 Dec 2024 21:05:59 +0200
Subject: [PATCH] feat: day 1 and 2 code in rust

---
 src/day1.rs | 50 ++++++++++++++++++++++++++++++++++++
 src/day2.rs | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/main.rs | 12 +++++++++
 3 files changed, 136 insertions(+)
 create mode 100644 src/day1.rs
 create mode 100644 src/day2.rs
 create mode 100644 src/main.rs

diff --git a/src/day1.rs b/src/day1.rs
new file mode 100644
index 0000000..137d7f4
--- /dev/null
+++ b/src/day1.rs
@@ -0,0 +1,50 @@
+use std::fs;
+fn parse_input(input_string: &str, column1: &mut Vec<i32>, column2: &mut Vec<i32>) {
+    let mut counter = 0;
+    input_string.split('\n').for_each(|line| {
+        if line.is_empty() {
+            return;
+        }
+        let values = line
+            .split_once(' ')
+            .expect("Expected line to split successfully");
+        // println!("{}, {}", values.0, values.1);
+        let first = values.0.trim().parse::<i32>().unwrap();
+        let second = values.1.trim().parse::<i32>().unwrap();
+        column1.insert(counter, first);
+        column2.insert(counter, second);
+        counter += 1;
+    });
+}
+pub fn part1(input_path: &str) {
+    println!("Part 1, Day 1");
+    let input = fs::read_to_string(input_path).expect("Expected to read the file");
+    let mut loc1: Vec<i32> = Vec::new();
+    let mut loc2: Vec<i32> = Vec::new();
+    parse_input(&input, &mut loc1, &mut loc2);
+    let mut sum = 0;
+    for i in 0..loc1.len() {
+        let diff = (loc1[i] - loc2[i]).abs();
+        // println!("1: {}, 2: {}, d: {}", loc1[i], loc2[i], diff);
+        sum += diff;
+    }
+    println!("Solution: {}", sum);
+}
+pub fn part2(input_path: &str) {
+    println!("Part 2, Day 1");
+    let input = fs::read_to_string(input_path).expect("Expected to read file normally");
+    let mut list1: Vec<i32> = Vec::new();
+    let mut list2: Vec<i32> = Vec::new();
+    parse_input(&input, &mut list1, &mut list2);
+    let mut similarity_score_sum = 0;
+    for elem in &list1 {
+        let mut occurences = 0;
+        for i in &list2 {
+            if elem == i {
+                occurences += 1;
+            }
+        }
+        similarity_score_sum += elem * occurences;
+    }
+    println!("Solution: {}", similarity_score_sum);
+}
diff --git a/src/day2.rs b/src/day2.rs
new file mode 100644
index 0000000..81e1ac0
--- /dev/null
+++ b/src/day2.rs
@@ -0,0 +1,74 @@
+use std::fs;
+fn parse_input(input_file_path: &str, data: &mut Vec<Vec<i32>>) {
+    let input =
+        fs::read_to_string(input_file_path).expect("Expected to parse string successfully!");
+    let mut i = 0;
+    for line in input.split('\n') {
+        if line.is_empty() {
+            return;
+        }
+        // println!("line: {}", line);
+        let items = line
+            .split(' ')
+            .map(|item| return item.trim().parse::<i32>().unwrap());
+        let mut tmp: Vec<i32> = vec![];
+        for (j, item) in items.enumerate() {
+            tmp.insert(j, item);
+        }
+        data.insert(i, tmp);
+        i += 1;
+    }
+}
+fn is_safe(arr: &[i32]) -> bool {
+    let mut is_increasing = true;
+    let mut is_decreasing = true;
+    for i in 0..arr.len() - 1 {
+        let diff = arr[i] - arr[i + 1];
+        if diff.abs() < 1 || diff.abs() > 3 {
+            return false;
+        }
+        if arr[i] - arr[i + 1] > 0 {
+            is_increasing = false;
+        }
+        if arr[i] - arr[i + 1] < 0 {
+            is_decreasing = false;
+        }
+    }
+    is_increasing || is_decreasing
+}
+fn is_also_safe(arr: &[i32]) -> bool {
+    let safe = is_safe(arr);
+    let mut also_safe = false;
+    if !safe {
+        for (i, _item) in arr.iter().enumerate() {
+            let mut test = arr.to_vec();
+            test.remove(i);
+            also_safe = if is_safe(&test) {true} else {also_safe};
+        }
+    }
+    safe || also_safe
+}
+pub fn part1(input_file_path: &str) {
+    println!("Part 1, Day 2");
+    let mut data = Vec::new();
+    parse_input(input_file_path, &mut data);
+    let mut c = 0;
+    for line in data {
+        if is_safe(&line) {
+            c += 1;
+        }
+    }
+    println!("Safe lines: {}", c);
+}
+pub fn part2(input_file_path: &str) {
+    println!("Part 2, Day 2");
+    let mut data = Vec::new();
+    parse_input(input_file_path, &mut data);
+    let mut c = 0;
+    for line in data {
+        if is_also_safe(&line) {
+            c += 1;
+        }
+    }
+    println!("Safe lines: {}", c);
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..c6bd8d8
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,12 @@
+use std::{
+    env,
+    fs,
+};
+mod day1;
+mod day2;
+fn main() {
+    day1::part1("./day1.input");
+    day1::part2("./day1.input");
+    day2::part1("./day2.input");
+    day2::part2("./day2.input");
+}