init

problems/p12/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "p12"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

problems/p12/src/main.rs

@@ -0,0 +1,42 @@
+struct TriNum {
+    current: usize,
+    sum: usize,
+}
+
+impl TriNum {
+    fn new() -> Self {
+        Self { current: 0, sum: 0 }
+    }
+}
+
+impl Iterator for TriNum {
+    type Item = usize;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.current += 1;
+        self.sum += self.current;
+        Some(self.sum)
+    }
+}
+
+fn factor_count(input: usize) -> usize {
+    let max = (input as f32).sqrt() as usize;
+    let mut count = 0;
+    for i in 1..=max {
+        if input % i == 0 {
+            count += 2;
+        }
+    }
+    count
+}
+
+fn main() {
+    let tri_num = TriNum::new();
+    for i in tri_num {
+        let count = factor_count(i);
+        if count > 500 {
+            println!("i: {i}");
+            break;
+        }
+    }
+}