Initial data commit

Task/Hailstone-sequence/Rust/hailstone-sequence.rust

@@ -0,0 +1,40 @@
+fn hailstone(start : u32) -> Vec<u32> {
+    let mut res = Vec::new();
+    let mut next = start;
+
+    res.push(start);
+
+    while next != 1  {
+        next = if next % 2 == 0 { next/2 } else { 3*next+1 };
+        res.push(next);
+    }
+    res
+}
+
+
+fn main() {
+    let test_num = 27;
+    let test_hailseq = hailstone(test_num);
+
+    println!("For {} number of elements is {} ", test_num, test_hailseq.len());
+
+    let fst_slice = test_hailseq[0..4].iter()
+                        .fold("".to_owned(), |acc, i| { acc + &*(i.to_string()).to_owned() + ", " });
+    let last_slice = test_hailseq[test_hailseq.len()-4..].iter()
+                        .fold("".to_owned(), |acc, i| { acc + &*(i.to_string()).to_owned() + ", " });
+
+    println!("  hailstone starting with {} ending with {} ", fst_slice, last_slice);
+
+    let max_range = 100000;
+    let mut max_len = 0;
+    let mut max_seed = 0;
+    for i_seed in 1..max_range {
+        let i_len = hailstone(i_seed).len();
+
+        if i_len > max_len {
+            max_len = i_len;
+            max_seed = i_seed;
+        }
+    }
+    println!("Longest sequence is {} element long for seed {}", max_len, max_seed);
+}