19

7 files changed, 1615 insertions, 0 deletions

diff --git a/19/Cargo.toml b/19/Cargo.toml
new file mode 100644
index 0000000..0c97bfc
--- /dev/null
+++ b/19/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "advent_19"
+version = "0.1.0"
+authors = ["Irene Knapp <ireneista@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+advent_lib = { path = "../lib" }
+
+[dev-dependencies]
+assert_cmd = "0.10"
diff --git a/19/input b/19/input
new file mode 100644
index 0000000..9f5fd22
--- /dev/null
+++ b/19/input
@@ -0,0 +1,1105 @@
+--- scanner 0 ---
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+--- scanner 1 ---
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+--- scanner 2 ---
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+--- scanner 3 ---
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+--- scanner 5 ---
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+--- scanner 6 ---
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+--- scanner 7 ---
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+--- scanner 8 ---
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+--- scanner 10 ---
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+--- scanner 11 ---
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+--- scanner 12 ---
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+--- scanner 13 ---
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+--- scanner 14 ---
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+--- scanner 19 ---
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+--- scanner 20 ---
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+--- scanner 21 ---
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+--- scanner 22 ---
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+--- scanner 25 ---
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+--- scanner 26 ---
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+--- scanner 27 ---
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+--- scanner 28 ---
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+--- scanner 29 ---
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+--- scanner 30 ---
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+--- scanner 31 ---
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+--- scanner 32 ---
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+--- scanner 33 ---
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+--- scanner 34 ---
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+--- scanner 35 ---
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+616,577,-692
+-504,-691,-431
+490,452,884
+-795,673,-319
+-306,-815,796
+162,-48,97
+-514,590,841
+676,-855,695
+858,-722,-751
+-569,536,746
+-454,-730,-566
+479,504,831
+-529,559,780
+802,-531,-721
+-726,577,-259
+-735,541,-421
+-456,-708,-552
+882,-692,-698
+468,587,-598
+459,590,-781
+584,-786,712
+-354,-826,746
+
+--- scanner 36 ---
+85,-89,-10
+637,-789,-745
+-699,285,462
+650,-641,-795
+607,534,479
+-422,-752,911
+-752,-972,-342
+-652,551,-510
+523,-762,527
+655,452,-736
+-646,637,-698
+-362,-788,711
+-603,-889,-362
+710,-759,617
+636,527,589
+509,520,-758
+533,-752,690
+-371,-780,836
+498,466,-675
+-721,303,477
+651,-916,-814
+-650,777,-574
+614,430,426
+-735,-899,-396
+-648,463,483
+
+--- scanner 37 ---
+-478,-931,649
+650,421,-299
+739,-924,-754
+630,555,-351
+-419,433,-606
+860,-917,-808
+130,-80,-41
+630,666,-310
+-531,-722,-523
+-673,-734,-613
+12,28,48
+-505,368,-594
+-489,-666,-603
+-401,286,-666
+971,-960,-740
+-260,709,452
+438,-512,532
+-664,-892,677
+404,-687,583
+466,-682,501
+-373,763,347
+593,373,497
+640,354,474
+427,343,536
+-645,-925,699
+-468,663,435
+
+--- scanner 38 ---
+-767,437,-422
+-603,498,-384
+-825,-542,-606
+-907,532,587
+465,495,-269
+-967,-441,-608
+488,-785,689
+-849,-604,850
+-626,332,-458
+549,449,675
+-743,-474,839
+-119,-92,157
+457,-465,-673
+648,-495,-617
+449,-650,639
+487,-518,-697
+562,294,762
+-814,399,541
+516,411,-221
+-891,-536,-578
+-883,-472,967
+-784,630,523
+471,-664,641
+596,382,-283
+557,490,749
+
+--- scanner 39 ---
+70,136,-4
+-670,751,-781
+-669,460,636
+-554,-600,-581
+735,797,-745
+868,-662,-834
+690,-707,-788
+470,562,446
+588,747,-671
+-352,-543,241
+385,-567,774
+-696,944,-725
+627,830,-806
+-504,-558,282
+-813,439,600
+-737,509,477
+362,517,402
+300,541,493
+-573,-587,-580
+-593,860,-821
+-652,-468,-543
+375,-651,665
+330,-484,669
+-369,-659,253
+819,-636,-883
+-90,92,-126
diff --git a/19/small b/19/small
new file mode 100644
index 0000000..4e496e9
--- /dev/null
+++ b/19/small
@@ -0,0 +1,136 @@
+--- scanner 0 ---
+404,-588,-901
+528,-643,409
+-838,591,734
+390,-675,-793
+-537,-823,-458
+-485,-357,347
+-345,-311,381
+-661,-816,-575
+-876,649,763
+-618,-824,-621
+553,345,-567
+474,580,667
+-447,-329,318
+-584,868,-557
+544,-627,-890
+564,392,-477
+455,729,728
+-892,524,684
+-689,845,-530
+423,-701,434
+7,-33,-71
+630,319,-379
+443,580,662
+-789,900,-551
+459,-707,401
+
+--- scanner 1 ---
+686,422,578
+605,423,415
+515,917,-361
+-336,658,858
+95,138,22
+-476,619,847
+-340,-569,-846
+567,-361,727
+-460,603,-452
+669,-402,600
+729,430,532
+-500,-761,534
+-322,571,750
+-466,-666,-811
+-429,-592,574
+-355,545,-477
+703,-491,-529
+-328,-685,520
+413,935,-424
+-391,539,-444
+586,-435,557
+-364,-763,-893
+807,-499,-711
+755,-354,-619
+553,889,-390
+
+--- scanner 2 ---
+649,640,665
+682,-795,504
+-784,533,-524
+-644,584,-595
+-588,-843,648
+-30,6,44
+-674,560,763
+500,723,-460
+609,671,-379
+-555,-800,653
+-675,-892,-343
+697,-426,-610
+578,704,681
+493,664,-388
+-671,-858,530
+-667,343,800
+571,-461,-707
+-138,-166,112
+-889,563,-600
+646,-828,498
+640,759,510
+-630,509,768
+-681,-892,-333
+673,-379,-804
+-742,-814,-386
+577,-820,562
+
+--- scanner 3 ---
+-589,542,597
+605,-692,669
+-500,565,-823
+-660,373,557
+-458,-679,-417
+-488,449,543
+-626,468,-788
+338,-750,-386
+528,-832,-391
+562,-778,733
+-938,-730,414
+543,643,-506
+-524,371,-870
+407,773,750
+-104,29,83
+378,-903,-323
+-778,-728,485
+426,699,580
+-438,-605,-362
+-469,-447,-387
+509,732,623
+647,635,-688
+-868,-804,481
+614,-800,639
+595,780,-596
+
+--- scanner 4 ---
+727,592,562
+-293,-554,779
+441,611,-461
+-714,465,-776
+-743,427,-804
+-660,-479,-426
+832,-632,460
+927,-485,-438
+408,393,-506
+466,436,-512
+110,16,151
+-258,-428,682
+-393,719,612
+-211,-452,876
+808,-476,-593
+-575,615,604
+-485,667,467
+-680,325,-822
+-627,-443,-432
+872,-547,-609
+833,512,582
+807,604,487
+839,-516,451
+891,-625,532
+-652,-548,-490
+30,-46,-14
diff --git a/19/src/main.rs b/19/src/main.rs
new file mode 100644
index 0000000..8b13d80
--- /dev/null
+++ b/19/src/main.rs
@@ -0,0 +1,344 @@
+use advent_lib::prelude::*;
+
+use std::collections::BTreeSet;
+
+
+#[derive(Debug, Clone, PartialOrd, Ord, PartialEq, Eq)]
+struct Point {
+  x: i64,
+  y: i64,
+  z: i64,
+}
+
+#[derive(Debug, Clone)]
+struct Rotation {
+  top: RotationAngle,
+  front: RotationAngle,
+  right: RotationAngle,
+}
+
+#[derive(Debug, Clone, Copy)]
+enum RotationAngle {
+  None,
+  Ninety,
+  OneEighty,
+  TwoSeventy,
+}
+
+
+fn main() -> Result<()> {
+  let mut args = std::env::args();
+  if args.len() != 2 {
+    eprintln!("Usage: advent input");
+  }
+  let _ = args.next();
+  let filename = args.next().unwrap();
+
+  let input = advent_lib::group_lines_by_blanks(
+    advent_lib::read_lines_file(&filename)?);
+
+  let mut scanners = Vec::new();
+  for group in &input {
+    let mut scanner = Vec::new();
+    for line in group.iter().skip(1) {
+      let values: Vec<&str> = line.split(",").collect();
+      let x = values[0].parse::<i64>().unwrap();
+      let y = values[1].parse::<i64>().unwrap();
+      let z = values[2].parse::<i64>().unwrap();
+      scanner.push(Point { x, y, z });
+    }
+    scanners.push(scanner);
+  }
+
+  let (merged_points, largest_distance) =
+    compare_all_scanners(&scanners, false);
+  println!("{}", merged_points.len());
+  println!("{}", largest_distance);
+
+  Ok(())
+}
+
+
+fn compare_all_scanners(all_scanners: &Vec<Vec<Point>>, perform_sort: bool)
+  -> (Vec<Point>, i64)
+{
+  let mut unvisited_scanners = all_scanners.clone();
+  let mut visited_scanner_offsets = Vec::new();
+
+  visited_scanner_offsets.push(Point { x: 0, y: 0, z: 0 });
+
+  loop {
+    let mut found_match = false;
+
+    //println!("{} scanners remain", unvisited_scanners.len());
+
+    for i in 0 .. unvisited_scanners.len() - 1 {
+      for j in i + 1 .. unvisited_scanners.len() {
+        //println!("comparing {} vs {}", i, j);
+        let scanner_a = &unvisited_scanners[i];
+        let scanner_b = &unvisited_scanners[j];
+
+        match compare_scanners(scanner_a, scanner_b) {
+          None => { },
+          Some((a_b_unioned_points, offset)) => {
+            //println!("matched {} vs {} for {} beacons", i, j,
+            //  a_b_unioned_points.len());
+
+            unvisited_scanners.remove(j);
+            unvisited_scanners[i] = a_b_unioned_points;
+            if perform_sort {
+              unvisited_scanners.sort_by(|a, b|
+                a.len().partial_cmp(&b.len()).unwrap());
+            }
+
+            visited_scanner_offsets.push(offset);
+
+            found_match = true;
+          },
+        }
+
+        if found_match {
+          break;
+        }
+      }
+
+      if found_match {
+        break;
+      }
+    }
+
+    if !found_match {
+      break;
+    }
+  }
+
+  let mut largest_distance = None;
+  for i in 0 .. visited_scanner_offsets.len() - 1 {
+    for j in i + 1 .. visited_scanner_offsets.len() {
+      let a = &visited_scanner_offsets[i];
+      let b = &visited_scanner_offsets[j];
+      let new_distance = compute_distance(a, b);
+
+      match largest_distance {
+        None => {
+          largest_distance = Some(new_distance);
+        }
+        Some(old_distance) => {
+          if new_distance > old_distance {
+            largest_distance = Some(new_distance);
+          }
+        }
+      }
+    }
+  }
+
+  (unvisited_scanners[0].clone(), largest_distance.unwrap())
+}
+
+
+fn compare_scanners(scanner_a: &Vec<Point>, scanner_b: &Vec<Point>)
+  -> Option<(Vec<Point>,Point)>
+{
+  let all_rotations = compute_all_rotations();
+
+  for rotation in &all_rotations {
+    let mut sorted_scanner_a = scanner_a.clone();
+    sorted_scanner_a.sort();
+
+    let mut sorted_scanner_b = Vec::new();
+    for point in scanner_b {
+      let rotated_point = apply_rotation(point, rotation);
+      sorted_scanner_b.push(rotated_point);
+    }
+    sorted_scanner_b.sort();
+
+    for a_i in 0 .. sorted_scanner_a.len() {
+      for b_i in 0 .. sorted_scanner_b.len() {
+        let a_origin_point = sorted_scanner_a[a_i].clone();
+        let b_origin_point = sorted_scanner_b[b_i].clone();
+
+        let mut n_matches = 0;
+        let mut a_j = 0;
+        let mut b_j = 0;
+        loop {
+          if a_j >= sorted_scanner_a.len() {
+            break;
+          }
+          if b_j >= sorted_scanner_b.len() {
+            break;
+          }
+
+          let a_point = point_difference(
+            &sorted_scanner_a[a_j], &a_origin_point);
+          let b_point = point_difference(
+            &sorted_scanner_b[b_j], &b_origin_point);
+
+          if a_point == b_point {
+            n_matches += 1;
+            a_j += 1;
+            b_j += 1;
+          } else if a_point < b_point {
+            a_j += 1;
+          } else {
+            b_j += 1;
+          }
+        }
+
+        if n_matches >= 12 {
+          let b_offset = point_difference(&a_origin_point, &b_origin_point);
+
+          let mut unioned_points = BTreeSet::new();
+          for point in sorted_scanner_a {
+            unioned_points.insert(point.clone());
+          }
+
+          for point in sorted_scanner_b {
+            let adjusted_point = point_sum(&point, &b_offset);
+            unioned_points.insert(adjusted_point);
+          }
+
+          let mut result = Vec::new();
+          for point in unioned_points {
+            result.push(point);
+          }
+          result.sort();
+
+          return Some((result, b_offset));
+        }
+      }
+    }
+  }
+
+  None
+}
+
+
+fn point_difference(left: &Point, right: &Point) -> Point {
+  Point {
+    x: left.x - right.x,
+    y: left.y - right.y,
+    z: left.z - right.z,
+  }
+}
+
+
+fn point_sum(left: &Point, right: &Point) -> Point {
+  Point {
+    x: left.x + right.x,
+    y: left.y + right.y,
+    z: left.z + right.z,
+  }
+}
+
+
+/* top 0, top 1, top 2, top 3 (front, right 0)
+ * top 0, top 1, top 2, top 3 (front 1, right 0)
+ * top 0, top 1, top 2, top 3 (front 2, right 0)
+ * top 0, top 1, top 2, top 3 (front 3, right 0)
+ * top 0, top 1, top 2, top 3 (front 0, right 1)
+ * top 0, top 1, top 2, top 3 (front 0, right 3)
+ */
+fn compute_all_rotations() -> Vec<Rotation> {
+  let mut result = Vec::new();
+
+  let all_angles = vec![
+    RotationAngle::None,
+    RotationAngle::Ninety,
+    RotationAngle::OneEighty,
+    RotationAngle::TwoSeventy,
+  ];
+
+  for front in 0 .. 4 {
+    for top in 0 .. 4 {
+      result.push(Rotation {
+        top: all_angles[top],
+        front: all_angles[front],
+        right: RotationAngle::None,
+      });
+    }
+  }
+
+  for right in [1, 3].iter() {
+    for top in 0 .. 4 {
+      result.push(Rotation {
+        top: all_angles[top],
+        front: RotationAngle::None,
+        right: all_angles[*right],
+      });
+    }
+  }
+
+  result
+}
+
+
+/*
+ * x is left-right, y is top-bottom, z is front-back.
+ * top, front, right have their standard Rubik's cube meanings.
+ */
+fn apply_rotation(point: &Point, rotation: &Rotation) -> Point {
+  let mut result = point.clone();
+
+  match rotation.top {
+    RotationAngle::None => { }
+    RotationAngle::Ninety => {
+      let temp_x = result.x;
+      result.x = result.z;
+      result.z = -temp_x;
+    }
+    RotationAngle::OneEighty => {
+      result.x = -result.x;
+      result.z = -result.z;
+    }
+    RotationAngle::TwoSeventy => {
+      let temp_x = result.x;
+      result.x = -result.z;
+      result.z = temp_x;
+    }
+  }
+
+  match rotation.front {
+    RotationAngle::None => { }
+    RotationAngle::Ninety => {
+      let temp_x = result.x;
+      result.x = result.y;
+      result.y = -temp_x;
+    }
+    RotationAngle::OneEighty => {
+      result.x = -result.x;
+      result.y = -result.y;
+    }
+    RotationAngle::TwoSeventy => {
+      let temp_x = result.x;
+      result.x = -result.y;
+      result.y = temp_x;
+    }
+  }
+
+  match rotation.right {
+    RotationAngle::None => { }
+    RotationAngle::Ninety => {
+      let temp_z = result.z;
+      result.z = result.y;
+      result.y = -temp_z;
+    }
+    RotationAngle::OneEighty => {
+      result.z = -result.z;
+      result.y = -result.y;
+    }
+    RotationAngle::TwoSeventy => {
+      let temp_z = result.z;
+      result.z = -result.y;
+      result.y = temp_z;
+    }
+  }
+
+  result
+}
+
+
+fn compute_distance(point_a: &Point, point_b: &Point) -> i64 {
+  (point_a.x - point_b.x).abs()
+    + (point_a.y - point_b.y).abs()
+    + (point_a.z - point_b.z).abs()
+}
diff --git a/19/tests/.main.rs.swm b/19/tests/.main.rs.swm
new file mode 100644
index 0000000..5054379
--- /dev/null
+++ b/19/tests/.main.rs.swm
Binary files differdiff --git a/19/tests/.main.rs.swn b/19/tests/.main.rs.swn
new file mode 100644
index 0000000..6017cf8
--- /dev/null
+++ b/19/tests/.main.rs.swn
Binary files differdiff --git a/19/tests/main.rs b/19/tests/main.rs
new file mode 100644
index 0000000..ae2797e
--- /dev/null
+++ b/19/tests/main.rs
@@ -0,0 +1,19 @@
+use assert_cmd::prelude::*;
+//use predicates::prelude::*;
+use std::process::Command;
+
+
+#[test]
+fn personal_input() -> Result<(), Box<dyn std::error::Error>> {
+  let mut command = Command::cargo_bin("advent_19")?;
+
+  command.arg("small");
+  command.assert().success().stdout(
+      "79\n\
+      3621\n");
+
+
+
+  Ok(())
+}
+