From 63ed9e7fe01d98764167d6372dd568a7858a4745 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ji=C5=99=C3=AD=20Sejkora?= <sejsel@sejsel.cz>
Date: Wed, 13 Jan 2021 01:43:23 +0100
Subject: [PATCH] Horizontal cuts (through transpose)

---
 src/combine-layouts.rs | 36 ++++++++++++++++++++++++++++++++----
 src/combine.rs         | 33 ++++++++++++++++++++++++---------
 2 files changed, 56 insertions(+), 13 deletions(-)

diff --git a/src/combine-layouts.rs b/src/combine-layouts.rs
index 193543e..58b3dea 100644
--- a/src/combine-layouts.rs
+++ b/src/combine-layouts.rs
@@ -1,5 +1,5 @@
 use db::LayoutDB;
-use city::City;
+use city::{City, House, SIZE};
 use itertools::Itertools;
 
 mod city;
@@ -18,8 +18,36 @@ fn main() {
 
     const TOP_LAYOUT_COUNT: usize = 100;
 
-    let chosen_layouts = sorted.iter().take(TOP_LAYOUT_COUNT).map(|l| l.houses()).collect();
-    eprintln!("Starting to combine {} top houses DB; vertical cuts", TOP_LAYOUT_COUNT);
+    let chosen_layouts: Vec<_> = sorted.iter().take(TOP_LAYOUT_COUNT).map(|l| l.houses().clone()).collect();
 
-    combine::try_combine(&city, &chosen_layouts, &chosen_layouts);
+    //eprintln!("Starting to combine {} top houses DB; vertical cuts", TOP_LAYOUT_COUNT);
+    //combine::try_combine(&city, &chosen_layouts, &chosen_layouts, false);
+
+    eprintln!("Transposing...");
+    let transposed_city = transpose_city(&city);
+    let transposed_chosen_layouts: Vec<_> = chosen_layouts.iter().map(|x| transpose_layout(x)).collect();
+    eprintln!("Starting to combine {} top houses DB; horizontal cuts", TOP_LAYOUT_COUNT);
+    combine::try_combine(&transposed_city, &transposed_chosen_layouts, &transposed_chosen_layouts, true);
+}
+
+fn transpose_city(city: &City) -> City {
+    let mut transposed_prices = vec![0u16; SIZE * SIZE];
+    for y in 0..SIZE {
+        for x in 0..SIZE {
+            // Sorry, cache! Not worth optimizing with blocks,
+            // this is not going to be ran often.
+            transposed_prices[y * SIZE + x] = city.get_price_xy(y, x);
+        }
+    }
+
+    City::new(transposed_prices)
+}
+
+fn transpose_layout(houses: &Vec<House>) -> Vec<House> {
+    let mut transposed = Vec::new();
+    for house in houses {
+        transposed.push(House::new(house.y, house.x));
+    }
+
+    transposed
 }
\ No newline at end of file
diff --git a/src/combine.rs b/src/combine.rs
index e67548b..9b142b4 100644
--- a/src/combine.rs
+++ b/src/combine.rs
@@ -5,7 +5,7 @@ use itertools::iproduct;
 use std::collections::VecDeque;
 use std::collections::vec_deque::Iter;
 
-pub fn try_combine(city: &City, left_layouts: &Vec<&Vec<House>>, right_layouts: &Vec<&Vec<House>>) {
+pub fn try_combine(city: &City, left_layouts: &Vec<Vec<House>>, right_layouts: &Vec<Vec<House>>, print_transposed: bool) {
     // Sorted in reverse so we can remove from the end
     let mut left_houses_sorted: Vec<Vec<House>> = left_layouts.iter()
         .map(|l| l.iter().sorted_by(|h1, h2| h2.x.cmp(&h1.x)).map(|x| *x).collect())
@@ -33,7 +33,12 @@ pub fn try_combine(city: &City, left_layouts: &Vec<&Vec<House>>, right_layouts:
     let mut best_price = None;
     // x is the last left coordinate, x+1 is right
     for x in 0..SIZE {
-        eprintln!("Starting x {}", x);
+        if print_transposed {
+            eprintln!("Starting y {}", x);
+        } else {
+            eprintln!("Starting x {}", x);
+        }
+
         // Update the lines
         for (left_line, left_houses) in lefts.iter_mut().zip(left_houses_sorted.iter_mut()) {
             while let Some(house) = left_houses.last() {
@@ -69,12 +74,22 @@ pub fn try_combine(city: &City, left_layouts: &Vec<&Vec<House>>, right_layouts:
             if is_compatible(city, &left, &right) {
                 if best_price.is_none() || price < best_price.unwrap() {
                     best_price = Some(price);
-                    eprintln!("{} - new best score, cut on x {}, left {} - right {}, printing", price, x, left_i, right_i);
-                    println!("{} - new best score, cut on x {}, left {} - right {}", price, x, left_i, right_i);
-                    let new_houses: Vec<_> = left.houses().chain(right.houses()).collect();
-                    println!("{}", new_houses.len());
-                    for house in new_houses {
-                        println!("{} {}", house.y, house.x);
+                    if print_transposed {
+                        eprintln!("{} - new best score, cut on y {}, left {} - right {}, printing", price, x, left_i, right_i);
+                        println!("{} - new best score, cut on y {}, left {} - right {}", price, x, left_i, right_i);
+                        let new_houses: Vec<_> = left.houses().chain(right.houses()).collect();
+                        println!("{}", new_houses.len());
+                        for house in new_houses {
+                            println!("{} {}", house.x, house.y);
+                        }
+                    } else {
+                        eprintln!("{} - new best score, cut on x {}, left {} - right {}, printing", price, x, left_i, right_i);
+                        println!("{} - new best score, cut on x {}, left {} - right {}", price, x, left_i, right_i);
+                        let new_houses: Vec<_> = left.houses().chain(right.houses()).collect();
+                        println!("{}", new_houses.len());
+                        for house in new_houses {
+                            println!("{} {}", house.y, house.x);
+                        }
                     }
                 }
                 compatibles += 1;
@@ -86,7 +101,7 @@ pub fn try_combine(city: &City, left_layouts: &Vec<&Vec<House>>, right_layouts:
             }
         }
 
-        eprintln!("{}/{} compatible", compatibles, compatibles + incompatibles);
+        eprintln!("{} incompatibles checked before {} compatible", incompatibles, compatibles);
     }
 }