diff --git a/src/main.rs b/src/main.rs
index a0c1c65..2aafffb 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,13 +5,23 @@ use std::fmt::Formatter;
 use std::collections::{HashMap, HashSet};
 use city::{HouseLayout, City, House};
 use crate::db::LayoutDB;
-use crate::population::build_house_probabilities;
+use crate::population::{build_house_probabilities, populate_from_saved_layout};
+use itertools::Itertools;
 
 mod optimization;
 mod population;
 mod city;
 mod db;
 
+#[derive(Eq, PartialEq)]
+enum LastStep {
+    None, MovingIndividual, MergingPairs
+}
+
+enum RunType {
+    GenNew, TryImproveBest
+}
+
 fn main() {
     let mut db = LayoutDB::from_file("layouts.sqlite").expect("Failed to load the DB");
     eprintln!("Loaded the DB, {} stored layouts", db.layouts().len());
@@ -19,12 +29,17 @@ fn main() {
     let city = City::read_from_file("01.in");
     eprintln!("Loaded the city file, {} houses", city.get_house_count());
 
-    const MIN_WEIGHT_SCORE: f64 = 600000.;
-    const MAX_WEIGHT_SCORE: f64 = 700000.;
+    const MIN_WEIGHT_SCORE: f64 = 540000.;
+    const MAX_WEIGHT_SCORE: f64 = 570000.;
     const DB_CHOICE_PROBABILITY: f64 = 0.99;
 
+    //let best_layouts = db.layouts().iter()
+    //    .sorted_by(|x, y| city::get_price(&city, x.houses()).cmp(&city::get_price(&city, y.houses())))
+    //    .take_while(|x| city::get_price(&city, x.houses()) < 550000);
+
     let mut best_price: Option<u32> = None;
 
+    //for best_layout in best_layouts {
     loop {
         let seed: u64 = thread_rng().gen();
         eprintln!("Starting seed {}", seed);
@@ -32,29 +47,30 @@ fn main() {
         let mut layout = HouseLayout::new(&city);
         //eprintln!("Starting random population...");
         //population::populate_random(&mut layout, &mut rng);
-        eprintln!("Starting random population, using DB ({}-{} {})...",
+
+        eprintln!("Starting random weighted population, using DB ({}-{} {})...",
                   MIN_WEIGHT_SCORE, MAX_WEIGHT_SCORE, DB_CHOICE_PROBABILITY);
         population::populate_using_db(&mut layout, &mut rng, &db, MIN_WEIGHT_SCORE, MAX_WEIGHT_SCORE, DB_CHOICE_PROBABILITY);
         eprintln!("Finished random init, price: {}, houses: {}", layout.price(), layout.houses().len());
-        let mut last_improved_step = -1;
+
+        //populate_from_saved_layout(&mut layout, &best_layout);
+        //eprintln!("Finished loading DB layout ID {}, price: {}, houses: {}", best_layout.id(), layout.price(), layout.houses().len());
+
+        let mut last_improved_step = LastStep::None;
         loop {
-            if last_improved_step == 1 {
-                break;
-            }
+            if last_improved_step == LastStep::MovingIndividual { break; }
             eprintln!("Starting moving individual houses...");
             if optimization::improve_move_individual_houses(&mut layout, &mut rng) {
                 dump_layout(&layout, &mut best_price, seed);
-                last_improved_step = 1;
+                last_improved_step = LastStep::MovingIndividual;
             }
             eprintln!("Finished moving individual houses...");
 
-            if last_improved_step == 2 {
-                break;
-            }
+            if last_improved_step == LastStep::MergingPairs { break; }
             eprintln!("Starting pairwise house merge...");
             if optimization::improve_merge_pairwise(&mut layout) {
                 dump_layout(&layout, &mut best_price, seed);
-                last_improved_step = 2;
+                last_improved_step = LastStep::MergingPairs;
             }
             eprintln!("Finished pairwise house merge");
             //eprintln!("Starting pairwise house move...");
@@ -63,6 +79,7 @@ fn main() {
             //    improved = true;
             //}
             //eprintln!("Finished pairwise house move");
+            if last_improved_step == LastStep::None { break; }
         }
         db.add_layout(&layout.houses(), true).expect("Failed to insert into DB");
     }
diff --git a/src/population.rs b/src/population.rs
index 5079660..5657d23 100644
--- a/src/population.rs
+++ b/src/population.rs
@@ -1,7 +1,7 @@
 use rand::Rng;
 use crate::city::{SIZE, House, HouseLayout, City};
 use rand::prelude::*;
-use crate::db::LayoutDB;
+use crate::db::{LayoutDB, SavedLayout};
 use crate::city;
 use std::collections::HashMap;
 use std::ops::Add;
@@ -74,3 +74,9 @@ pub fn populate_using_db(layout: &mut HouseLayout, mut rng: &mut StdRng, db: &La
         }
     }
 }
+
+pub fn populate_from_saved_layout(layout: &mut HouseLayout, saved_layout: &SavedLayout) {
+    for house in saved_layout.houses() {
+        layout.add_house(*house);
+    }
+}