problem 5

src/main.rs

@@ -5,11 +5,13 @@ use crate::problem1::lib::Problem1;
 use crate::problem2::lib::Problem2;
 use crate::problem3::lib::Problem3;
 use crate::problem4::lib::Problem4;
+use crate::problem5::lib::Problem5;
 
 mod problem1;
 mod problem2;
 mod problem3;
 mod problem4;
+mod problem5;
 mod util;
 
 
@@ -35,7 +37,11 @@ fn main() {
     // problem3.run_part1();
     // problem3.run_part2();
 
-    let problem4 = Problem4::new(&util::get_problem(4));
-    problem4.run_part1();
-    problem4.run_part2();
+    // let problem4 = Problem4::new(&util::get_problem(4));
+    // problem4.run_part1();
+    // problem4.run_part2();
+
+    let problem5 = Problem5::new(&util::get_problem(5));
+    problem5.run_part1();
+    problem5.run_part2();
 }

src/problem5/lib.rs

@@ -0,0 +1,228 @@
+/*
+Specifically, they need you to find the two entries that sum to 2020 and then multiply those two numbers together.
+*/
+
+use crate::Problem;
+
+pub struct Problem5 {
+    seats: Vec<Vec<Side>>,
+}
+
+#[derive(Clone, Copy, Debug)]
+enum Side {
+    Left,
+    Right,
+    Front,
+    Back
+}
+
+fn split(side: Side, lower: &mut i32, upper: &mut i32) -> Option<i32> {
+    match side {
+/*        Side::Left => {
+            *upper = ((*upper - *lower + 1) / 2 + *lower);
+            //println!("{}, {}", *upper, *lower);
+            if (*upper - *lower).abs() == 1 {
+                Some(*lower)
+            } else {
+                None
+            }
+        }
+        Side::Right => {
+            *lower = ((*upper - *lower + 1) / 2 + *lower - 1);
+            //println!("{}, {}", *upper, *lower);
+            if (*upper - *lower).abs() == 1 {
+                Some(*upper - 1)
+            } else {
+                None
+            }
+        }
+        Side::Front => {
+            *upper = ((*upper - *lower + 1) / 2 + *lower);
+           // println!("{}, {}", *upper, *lower);
+            if (*upper - *lower).abs() == 1 {
+                Some(*lower)
+            } else {
+                None
+            }
+        }
+        Side::Back => {
+            *lower = ((*upper - *lower + 1) / 2 + *lower);
+            //println!("{}, {}", *upper, *lower);
+            if (*upper - *lower).abs() == 1 {
+                Some(*upper - 1)
+            } else {
+                None
+            }
+        }*/
+        Side::Left => {
+            if (*upper - *lower).abs() == 1 {
+                Some(*lower)
+            } else {
+                *upper = ((*upper - *lower + 1) / 2 + *lower - 1);
+                println!("{}, {}", *upper, *lower);
+                None
+            }
+        }
+        Side::Right => {
+            if (*upper - *lower).abs() == 1 {
+                Some(*upper)
+            } else {
+                *lower = ((*upper - *lower + 1) / 2 + *lower);
+                println!("{}, {}", *upper, *lower);
+                None
+            }
+        }
+        Side::Front => {
+            if (*upper - *lower).abs() == 1 {
+                Some(*lower)
+            } else {
+                *upper = ((*upper - *lower + 1) / 2 + *lower - 1);
+                println!("{}, {}", *upper, *lower);
+                None
+            }
+        }
+        Side::Back => {
+            if (*upper - *lower).abs() == 1 {
+                Some(*upper)
+            } else {
+                *lower = ((*upper - *lower + 1) / 2 + *lower);
+                println!("{}, {}", *upper, *lower);
+                None
+            }
+        }
+    }
+}
+
+impl Problem5 {}
+
+impl Problem for Problem5 {
+    fn new(input: &String) -> Self {
+        Problem5 {
+            seats: input
+                .split("\n")
+                .filter_map(|s| {
+                    let s = s.trim();
+                    if !s.is_empty() {
+                        let v : Vec<Side> = s.chars().map(|c| {
+                            match c {
+                                'F' => {Side::Front},
+                                'B' => {Side::Back},
+                                'L' => {Side::Left},
+                                'R' => {Side::Right},
+                                _ => {Side::Front}
+                            }
+                        }).collect::<Vec<Side>>();
+                        Some(v)
+                    } else {
+                        None
+                    }
+                }).collect(),
+        }
+    }
+
+    fn run_part1(&self) {
+
+        let mut highest_id = 0;
+
+        for s in &self.seats {
+
+            let mut front = 0;
+            let mut back = 127;
+            let mut right = 7;
+            let mut left = 0;
+
+            let mut row = 0;
+            let mut col = 0;
+
+            for op in s {
+                match op {
+                    Side::Left | Side::Right => {
+                        match split(*op, &mut left, &mut right) {
+                            None => {}
+                            Some(v) => {col = v}
+                        }
+                    }
+                    Side::Front | Side::Back => {
+                        match split(*op, &mut front, &mut back) {
+                            None => {}
+                            Some(v) => {row = v}
+                        }
+                    }
+                }
+            }
+
+
+            println!("EndState: {:?}, {}, {}", s, front, back);
+            println!("Row, Col: {}, {}", row, col);
+
+            let seat_id = row * 8 + col;
+            println!("SeatID  : {}", seat_id);
+
+            if seat_id > highest_id {
+                highest_id = seat_id;
+            }
+        }
+
+        println!("{}", highest_id)
+    }
+
+    fn run_part2(&self) {
+
+        let mut seats = Vec::new();
+
+        for s in &self.seats {
+
+            let mut front = 0;
+            let mut back = 127;
+            let mut right = 7;
+            let mut left = 0;
+
+            let mut row = 0;
+            let mut col = 0;
+
+            for op in s {
+                match op {
+                    Side::Left | Side::Right => {
+                        match split(*op, &mut left, &mut right) {
+                            None => {}
+                            Some(v) => {col = v}
+                        }
+                    }
+                    Side::Front | Side::Back => {
+                        match split(*op, &mut front, &mut back) {
+                            None => {}
+                            Some(v) => {row = v}
+                        }
+                    }
+                }
+            }
+
+            let seat_id = row * 8 + col;
+            seats.push(seat_id);
+        }
+        seats.sort();
+        println!("{:?}", seats);
+        let mut last = 0;
+        for i in seats {
+            if last == 0 {
+                last = i;
+            }
+            if i - last > 1 {
+               println!("{}", i);
+            }
+            last = i
+        }
+    }
+}
+
+/*
+
+EndState: [Front, Front, Front, Back, Back, Front, Front, Left, Left, Left], 12, 13
+Row, Col: 12, 1
+SeatID  : 97
+
+EndState: [Front, Front, Front, Back, Back, Front, Front, Left, Left, Right], 12, 13
+Row, Col: 12, 1
+SeatID  : 97
+
+ */

src/problem5/mod.rs

@@ -0,0 +1 @@
+pub mod lib;