init

problems/p14/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "p14"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

problems/p14/src/main.rs

@@ -0,0 +1,28 @@
+use std::collections::HashMap;
+
+fn gen_seq(n: u64) -> u64 {
+    if n & 1 == 0 { n >> 1 } else { 3 * n + 1 }
+}
+
+fn main() {
+    let mut result = HashMap::new();
+    for i in 1..1000000 {
+        let mut seq = gen_seq(i);
+        let mut counter: u32 = 1;
+        while seq != 1 {
+            seq = gen_seq(seq);
+            counter += 1;
+        }
+        counter += 1;
+        result.insert(i, counter);
+    }
+    let mut biggest_seq = 0;
+    let mut biggest_seq_index = 0;
+    for (k, v) in result {
+        if v > biggest_seq {
+            biggest_seq = v;
+            biggest_seq_index = k;
+        }
+    }
+    println!("{biggest_seq_index}")
+}