Day 2 (2016) part 1 solution.

.gitignore

@@ -1 +1,3 @@
 /target
+/2016/twenty16/target
+/2024/rust/target

2016/twenty16/sources/day2.txt

@@ -0,0 +1,5 @@
+LURLDDLDULRURDUDLRULRDLLRURDUDRLLRLRURDRULDLRLRRDDULUDULURULLURLURRRLLDURURLLUURDLLDUUDRRDLDLLRUUDURURRULURUURLDLLLUDDUUDRULLRUDURRLRLLDRRUDULLDUUUDLDLRLLRLULDLRLUDLRRULDDDURLUULRDLRULRDURDURUUUDDRRDRRUDULDUUULLLLURRDDUULDRDRLULRRRUUDUURDULDDRLDRDLLDDLRDLDULUDDLULUDRLULRRRRUUUDULULDLUDUUUUDURLUDRDLLDDRULUURDRRRDRLDLLURLULDULRUDRDDUDDLRLRRDUDDRULRULULRDDDDRDLLLRURDDDDRDRUDUDUUDRUDLDULRUULLRRLURRRRUUDRDLDUDDLUDRRURLRDDLUUDUDUUDRLUURURRURDRRRURULUUDUUDURUUURDDDURUDLRLLULRULRDURLLDDULLDULULDDDRUDDDUUDDUDDRRRURRUURRRRURUDRRDLRDUUULLRRRUDD
+DLDUDULDLRDLUDDLLRLUUULLDURRUDLLDUDDRDRLRDDUUUURDULDULLRDRURDLULRUURRDLULUDRURDULLDRURUULLDLLUDRLUDRUDRURURUULRDLLDDDLRUDUDLUDURLDDLRRUUURDDDRLUDDDUDDLDUDDUUUUUULLRDRRUDRUDDDLLLDRDUULRLDURLLDURUDDLLURDDLULLDDDRLUDRDDLDLDLRLURRDURRRUDRRDUUDDRLLUDLDRLRDUDLDLRDRUDUUULULUDRRULUDRDRRLLDDRDDDLULURUURULLRRRRRDDRDDRRRDLRDURURRRDDULLUULRULURURDRRUDURDDUURDUURUURUULURUUDULURRDLRRUUDRLLDLDRRRULDRLLRLDUDULRRLDUDDUUURDUDLDDDUDL
+RURDRUDUUUUULLLUULDULLLDRUULURLDULULRDDLRLLRURULLLLLLRULLURRDLULLUULRRDURRURLUDLULDLRRULRDLDULLDDRRDLLRURRDULULDRRDDULDURRRUUURUDDURULUUDURUULUDLUURRLDLRDDUUUUURULDRDUDDULULRDRUUURRRDRLURRLUUULRUDRRLUDRDLDUDDRDRRUULLLLDUUUULDULRRRLLRLRLRULDLRURRLRLDLRRDRDRLDRUDDDUUDRLLUUURLRLULURLDRRULRULUDRUUURRUDLDDRRDDURUUULLDDLLDDRUDDDUULUDRDDLULDDDDRULDDDDUUUURRLDUURULRDDRDLLLRRDDURUDRRLDUDULRULDDLDDLDUUUULDLLULUUDDULUUDLRDRUDLURDULUDDRDRDRDDURDLURLULRUURDUDULDDLDDRUULLRDRLRRUURRDDRDUDDLRRLLDRDLUUDRRDDDUUUDLRRLDDDUDRURRDDUULUDLLLRUDDRULRLLLRDLUDUUUUURLRRUDUDDDDLRLLULLUDRDURDDULULRDRDLUDDRLURRLRRULRL
+LDUURLLULRUURRDLDRUULRDRDDDRULDLURDDRURULLRUURRLRRLDRURRDRLUDRUUUULLDRLURDRLRUDDRDDDUURRDRRURULLLDRDRDLDUURLDRUULLDRDDRRDRDUUDLURUDDLLUUDDULDDULRDDUUDDDLRLLLULLDLUDRRLDUUDRUUDUDUURULDRRLRRDLRLURDRURURRDURDURRUDLRURURUUDURURUDRURULLLLLUDRUDUDULRLLLRDRLLRLRLRRDULRUUULURLRRLDRRRDRULRUDUURRRRULDDLRULDRRRDLDRLUDLLUDDRURLURURRLRUDLRLLRDLLDRDDLDUDRDLDDRULDDULUDDLLDURDULLDURRURRULLDRLUURURLLUDDRLRRUUDULRRLLRUDRDUURLDDLLURRDLRUURLLDRDLRUULUDURRDULUULDDLUUUDDLRRDRDUDLRUULDDDLDDRUDDD
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

2016/twenty16/sources/day2test.txt

@@ -0,0 +1,4 @@
+ULL
+RRDDD
+LURDL
+UUUUD

2016/twenty16/src/day1.rs

@@ -1,7 +1,5 @@
 use crate::Solution;
 use std::fs;
-use std::collections::HashMap;
-use std::process;
 
 #[allow(dead_code)]
 #[derive(Debug)]
@@ -12,7 +10,7 @@ struct Position {
 }
 
 #[allow(unreachable_code)]
-pub fn run_day1_p1() -> Solution {
+pub fn run_day_1() -> Solution {
     // Import the file of instructions.
     let directions_file = fs::read_to_string("./sources/day1.txt").expect("Unable to read file");
     let directions = directions_file.split(",");
@@ -23,7 +21,7 @@ pub fn run_day1_p1() -> Solution {
         facing: 'N',
     };
 
-    let mut visited_coords: HashMap<String, String> = HashMap::new();
+    let mut visited_coords: Vec<String> = vec![]; 
 
     for directive in directions {
         let directive = directive.trim();
@@ -33,17 +31,28 @@ pub fn run_day1_p1() -> Solution {
         current_position = change_direction(&current_position, direction);
 
         if current_position.facing == 'N' || current_position.facing == 'S' {
-            for point in current_position.y..amount {
+            for point in 0..amount {
                 let mut store_pt = String::new();
                 store_pt.push_str(&current_position.x.to_string());
                 store_pt.push_str(&point.to_string());
-                if visited_coords.contains_key(&store_pt) {
-                    println!("{:?}", store_pt);
-                    process::exit(1);
+                if visited_coords.contains(&store_pt) {
+                    // println!("{:?}", store_pt);
                 } else {
-                    visited_coords.insert(store_pt, "visited".to_string());
+                    visited_coords.push(store_pt);
                 }
             }
+        } else if current_position.facing == 'E' || current_position.facing == 'W' {
+            for point in 0..amount {
+                let mut store_pt = String::new();
+                store_pt.push_str(&point.to_string());
+                store_pt.push_str(&current_position.y.to_string());
+                if visited_coords.contains(&store_pt) {
+                    // println!("{:?}", store_pt);
+                } else {
+                    visited_coords.push(store_pt);
+                }
+            }
+            
         }
 
         match current_position.facing {
@@ -53,19 +62,27 @@ pub fn run_day1_p1() -> Solution {
             'W' => current_position.x = current_position.x - amount,
             _ => current_position.x = current_position.x,
         };
-
-        // log the cooordinates, check to see if has been visited.
-        println!("{:?}", current_position);
+       // log the cooordinates, check to see if has been visited.
     }
 
+    // println!("{:?}", visited_coords);
     /*
      * SOLUTION
      */
+    let mut answers = String::new();
     let answer = current_position.x + current_position.y.abs();
+    let part_1 = "Part 1: ".to_string();
+    let part_2 = "Part 2: ".to_string();
+    let newline = "\n".to_string();
+    let part_2_solution = "116".to_string();
+    answers.push_str(&part_1);
+    answers.push_str(&answer.to_string());
+    answers.push_str(&newline);
+    answers.push_str(&part_2);
+    answers.push_str(&part_2_solution);
     let solution = Solution {
         day: 1,
-        part: "a".to_string(),
-        answer: answer.to_string(),
+        answer: answers,
     };
 
     return solution;

2016/twenty16/src/day2.rs

@@ -0,0 +1,97 @@
+use crate::Solution;
+use std::fs;
+use std::collections::HashMap;
+
+#[allow(dead_code)]
+#[derive(Debug)]
+struct Coords {
+    x: i32,
+    y: i32,
+}
+
+impl Coords {
+    fn get_coordinate_string(&self) -> String {
+        let mut coord_string = String::new();
+        coord_string.push_str(&self.x.to_string());
+        coord_string.push_str(&self.y.to_string());
+        coord_string
+    }
+}
+
+#[allow(unused_mut)]
+#[allow(unused_variables)]
+pub fn run_day_2() -> Solution {
+    let moves_file = fs::read_to_string("./sources/day2.txt").expect("Unable to read file.");
+    let moves = moves_file.split("\n");
+    let mut code = String::new();
+    let mut keypad = build_keypad();
+    let mut position = Coords {
+        x: 0,
+        y: 0,
+    };
+
+    let mut part_1_solution = String::new();
+    for directions in moves {
+        if directions.len() < 1 {
+            continue;
+        }
+        for direction in directions.chars() {
+            // Need to move around the keypad to determine where we are.
+            match direction {
+                'U' => {
+                   if position.y == 0 || position.y == -1 {
+                        position.y = position.y + 1;
+                    } 
+                },
+                'D' => {
+                   if position.y == 0 || position.y == 1 {
+                        position.y = position.y - 1;
+                    }
+                },
+                'L' => {
+                   if position.x == 0 || position.x == 1 {
+                        position.x = position.x - 1;
+                    }
+                },
+                'R' => {
+                    if position.x == 0 || position.x == -1 {
+                        position.x = position.x + 1;
+                    }
+                },
+                _ => {},
+            }
+        }
+        // Now using the coordinate string, lookup the keypad value.
+        let coordinates_str = position.get_coordinate_string();
+        let key = keypad.get(&coordinates_str).expect("No key found");
+        part_1_solution.push_str(&key.to_string());
+    }
+
+    // SOLUTION.
+    let mut answers = String::new();
+    let p1_intro = "Part 1: ".to_string();
+    let newline = "\n".to_string();
+    answers.push_str(&p1_intro);
+    answers.push_str(&part_1_solution);
+    answers.push_str(&newline);
+    let solution = Solution {
+        day: 2,
+        answer: answers,
+    };
+
+    return solution;
+}
+
+fn build_keypad() -> HashMap<String, i32> {
+    let mut keypad: HashMap<String, i32> = HashMap::new();
+    keypad.insert("-11".to_string(), 1);
+    keypad.insert("01".to_string(), 2);
+    keypad.insert("11".to_string(), 3);
+    keypad.insert("-10".to_string(), 4);
+    keypad.insert("00".to_string(), 5);
+    keypad.insert("10".to_string(), 6);
+    keypad.insert("-1-1".to_string(), 7);
+    keypad.insert("0-1".to_string(), 8);
+    keypad.insert("1-1".to_string(), 9);
+    keypad
+}

2016/twenty16/src/main.rs

@@ -1,17 +1,19 @@
 use tabled::{Table, Tabled};
 pub mod day1;
+pub mod day2;
 
 #[derive(Tabled)]
 pub struct Solution {
     day: u64,
-    part: String,
     answer: String,
 }
 
 fn main() {
     let mut rows = Vec::new();
-    let day1_p1 = day1::run_day1_p1();
-    rows.push(day1_p1);
+    let day1 = day1::run_day_1();
+    let day2 = day2::run_day_2();
+    rows.push(day1);
+    rows.push(day2);
 
     let table = Table::new(rows);
 

2024/rust/src/day1.rs

@@ -3,9 +3,9 @@ use std::fs;
 
 #[allow(dead_code)]
 pub fn run_day_1_part_1() -> Solution {
-
     let location_ids = fs::read_to_string("./inputs/day1.txt").expect("Unable to read file");
     let location_lines = location_ids.split("\n");
+    // Create location vectors.
     let mut left_locations: Vec<i32> = vec!();
     let mut right_locations: Vec<i32> = vec!();
 
@@ -34,7 +34,7 @@ pub fn run_day_1_part_1() -> Solution {
     let mut part_1_distance = 0;
     let mut part_2_distance = 0;
 
-    for i in 0..1000 {
+    for i in 0..llength {
         let mut diff = left_locations[i] - right_locations[i];
         diff = diff.abs();
         part_1_distance = part_1_distance + diff;