days 1-3

.gitignore

@@ -8,3 +8,9 @@ Cargo.lock
 
 # These are backup files generated by rustfmt
 **/*.rs.bk
+
+id.txt
+
+**/.idea
+*.iml
+*/target

day1/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "day1"
+version = "0.1.0"
+authors = ["henine <matija@rezar.biz>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day1/input

@@ -0,0 +1,200 @@
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day1/src/main.rs

@@ -0,0 +1,32 @@
+use std::vec::Vec;
+use std::io;
+
+fn main() {
+    let mut numbers: Vec<i32> = Vec::new();
+
+    let mut line = String::new();
+
+    loop {
+        match io::stdin().read_line(&mut line) {
+            Ok(0) => {
+                break;
+            }
+            Ok(_n) => {
+                println!("{}", line);
+                numbers.push(line.trim().parse().unwrap());
+                line.truncate(0);
+            }
+            Err(error) => println!("error: {}", error),
+        }
+    }
+
+    for i in 0..numbers.len() - 2 {
+        for j in i + 1..numbers.len() - 1 {
+            for k in j + 1..numbers.len() {
+                if numbers[i] + numbers[j] + numbers[k] == 2020 {
+                    println!("{}", numbers[i] * numbers[j] * numbers[k]);
+                };
+            }
+        }
+    }
+}

day2/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "day2"
+version = "0.1.0"
+authors = ["henine <matija@rezar.biz>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+scan_fmt = "*"

day2/src/main.rs

@@ -0,0 +1,46 @@
+use std::fs::File;
+use std::io::{BufReader, BufRead};
+
+#[macro_use]
+extern crate scan_fmt;
+
+fn main() {
+    let file = match File::open("input") {
+        Ok(file) => file,
+        Err(e) => panic!(e)
+    };
+
+    let input_buffer = BufReader::new(&file);
+
+
+    let mut count = 0;
+
+    for line_result in input_buffer.lines() {
+        let line = line_result.unwrap();
+        if match scan_fmt!(&line, "{d}-{d} {}: {}", i32,i32,char, String) {
+            Ok((min_occ, max_occ, letter, password)) => is_correct2(min_occ as usize, max_occ as usize, letter, &password),
+            Err(e) => panic!(e)
+        } {
+            count += 1;
+        }
+    }
+
+    println!("{}", count);
+}
+
+fn is_correct(min_occ: i32, max_occ: i32, letter: char, password: &String) -> bool {
+    let mut count = 0;
+
+    for c in password.chars() {
+        if c == letter {
+            count += 1;
+        }
+    }
+
+
+    count >= min_occ && count <= max_occ
+}
+
+fn is_correct2(p1: usize, p2: usize, letter: char, password: &String) -> bool {
+    (password.as_bytes()[p1-1] == letter as u8) ^ (password.as_bytes()[p2-1] == letter as u8)
+}

day3/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "day3"
+version = "0.1.0"
+authors = ["henine <matija@rezar.biz>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day3/input

@@ -0,0 +1,323 @@
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day3/src/main.rs

@@ -0,0 +1,45 @@
+use std::fs::File;
+use std::io::{BufReader, BufRead};
+
+fn main() {
+    let file = match File::open("input") {
+        Ok(file) => file,
+        Err(e) => panic!(e)
+    };
+
+    let input_buffer = BufReader::new(&file);
+
+
+    let mut count: [u32; 5] = [0, 0, 0, 0, 0];
+
+    let mut line_n = 0;
+
+    for line_result in input_buffer.lines() {
+        let line_string = line_result.unwrap();
+        let line = line_string.as_bytes();
+
+        if line[(1 * line_n) % line.len()] == '#' as u8 {
+            count[0] += 1;
+        }
+
+        if line[(3 * line_n) % line.len()] == '#' as u8 {
+            count[1] += 1;
+        }
+
+        if line[(5 * line_n) % line.len()] == '#' as u8 {
+            count[2] += 1;
+        }
+
+        if line[(7 * line_n) % line.len()] == '#' as u8 {
+            count[3] += 1;
+        }
+
+        if line_n % 2 == 0 && line[(1 * line_n/2) % line.len()] == '#' as u8 {
+            count[4] += 1;
+        }
+
+        line_n += 1;
+    }
+
+    println!("{}", count[0] * count[1] * count[2] * count[3] * count[4]);
+}