add day 3

day03/Cargo.lock

@@ -0,0 +1,25 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "day03"
+version = "0.1.0"
+dependencies = [
+ "itertools",
+]
+
+[[package]]
+name = "either"
+version = "1.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91622ff5e7162018101f2fea40d6ebf4a78bbe5a49736a2020649edf9693679e"
+
+[[package]]
+name = "itertools"
+version = "0.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b4baf93f58d4425749ca49a51c50ebab072c5df6994d08fed93541c331481dc"
+dependencies = [
+ "either",
+]

day03/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "day03"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+itertools = "*"

day03/example.txt

@@ -0,0 +1 @@
+5 10 25

day03/src/main.rs

@@ -0,0 +1,51 @@
+use itertools::Itertools;
+
+fn main() {
+    let binding = std::fs::read_to_string("input.txt").unwrap();
+    let data: Vec<Vec<_>> = binding
+        .lines()
+        .map(|l| {
+            l.split_whitespace()
+                .map(|s| s.parse::<usize>().unwrap())
+                .collect()
+        })
+        .collect();
+
+    part1(&data);
+
+    let mut a: Vec<usize> = vec![];
+    let mut b: Vec<usize> = vec![];
+    let mut c: Vec<usize> = vec![];
+
+    binding.lines().for_each(|l| {
+        let mut iter = l.split_whitespace();
+        a.push(iter.next().unwrap().parse().unwrap());
+        b.push(iter.next().unwrap().parse().unwrap());
+        c.push(iter.next().unwrap().parse().unwrap());
+    });
+
+    b.drain(..).for_each(|item| a.push(item));
+    c.drain(..).for_each(|item| a.push(item));
+
+    let data: Vec<_> = a
+        .iter()
+        .tuples()
+        .map(|(a, b, c)| vec![*a, *b, *c])
+        .collect();
+
+    part1(&data);
+}
+
+fn part1(data: &[Vec<usize>]) {
+    let result = data
+        .iter()
+        .filter(|t| {
+            let a: usize = t[0];
+            let b: usize = t[1];
+            let c: usize = t[2];
+            a + b > c && a + c > b && b + c > a
+        })
+        .count();
+
+    println!("{result}");
+}