diff --git a/src/10part1.rs b/src/10part1.rs
new file mode 100644
index 0000000..74f9bd6
--- /dev/null
+++ b/src/10part1.rs
@@ -0,0 +1,97 @@
+use std::{fs, collections::HashMap};
+
+#[derive(Eq, PartialEq, Hash, Copy, Clone)]
+struct Coordinate {
+    x: usize,
+    y: usize,
+}
+
+fn main() {
+    let file_path = "input/10input.txt";
+    let contents = fs::read_to_string(file_path).expect("should read file");
+    let mut lines = contents.lines();
+    let mut matrix: Vec<Vec<char>> = Vec::new();
+    loop {
+        match lines.next() {
+            Some(line) => {
+                matrix.push(line.chars().collect());
+            },
+            None => break,
+        }
+    }
+    let mut connection_map: HashMap<Coordinate, Vec<Coordinate>> = HashMap::new();
+    let mut starting_point: Coordinate = Coordinate { x: 0, y:  0};
+    for i in 0..matrix.len() {
+        for j in 0..matrix[i].len() {
+            match matrix[i][j] {
+                '|' => {
+                    if i > 0 && (matrix[i-1][j] == '|' || matrix[i-1][j] == '7' || matrix[i-1][j] == 'F' || matrix[i-1][j] == 'S') && i < matrix.len()-1 && (matrix[i+1][j] == '|' || matrix[i+1][j] == 'L' || matrix[i+1][j] == 'J' || matrix[i+1][j] == 'S') {
+                        connection_map.insert(Coordinate { x: j, y: i}, vec![Coordinate { x: j, y: i-1}, Coordinate { x: j, y: i+1}]);
+                    }
+                },
+                '-' => {
+                    if j > 0 && (matrix[i][j-1] == '-' || matrix[i][j-1] == 'L' || matrix[i][j-1] == 'F' || matrix[i][j-1] == 'S') && j < matrix[i].len()-1 && (matrix[i][j+1] == '-' || matrix[i][j+1] == 'J' || matrix[i][j+1] == '7' || matrix[i][j+1] == 'S') {
+                        connection_map.insert(Coordinate { x: j, y: i}, vec![Coordinate { x: j-1, y: i}, Coordinate { x: j+1, y: i}]);
+                    }
+                },
+                'L' => {
+                    if i > 0 && (matrix[i-1][j] == '|' || matrix[i-1][j] == '7' || matrix[i-1][j] == 'F' || matrix[i-1][j] == 'S') && j < matrix[i].len()-1 && (matrix[i][j+1] == '-' || matrix[i][j+1] == '7' || matrix[i][j+1] == 'J' || matrix[i][j+1] == 'S') {
+                        connection_map.insert(Coordinate { x: j, y: i}, vec![Coordinate { x: j, y: i-1}, Coordinate { x: j+1, y: i}]);
+                    }
+                }
+                'J' => {
+                    if i > 0 && (matrix[i-1][j] == '|' || matrix[i-1][j] == '7' || matrix[i-1][j] == 'F' || matrix[i-1][j] == 'S') && j > 0 && (matrix[i][j-1] == '-' || matrix[i][j-1] == 'L' || matrix[i][j-1] == 'F' || matrix[i][j-1] == 'S' ) {
+                        connection_map.insert(Coordinate { x: j, y: i}, vec![Coordinate { x: j, y: i-1}, Coordinate { x: j-1, y: i}]);
+                    }
+                }
+                '7' => {
+                    if i < matrix.len()-1 && (matrix[i+1][j] == '|' || matrix[i+1][j] == 'L' || matrix[i+1][j] == 'J' || matrix[i+1][j] == 'S') && j > 0 && (matrix[i][j-1] == '-' || matrix[i][j-1] == 'L' || matrix[i][j-1] == 'F' || matrix[i][j-1] == 'S' ) {
+                        connection_map.insert(Coordinate { x: j, y: i}, vec![Coordinate { x: j, y: i+1}, Coordinate { x: j-1, y: i}]);
+                    }
+                }
+                'F' => {
+                    if i < matrix.len()-1 && (matrix[i+1][j] == '|' || matrix[i+1][j] == 'L' || matrix[i+1][j] == 'J' || matrix[i+1][j] == 'S') && j < matrix[i].len()-1 && (matrix[i][j+1] == '-' || matrix[i][j+1] == '7' || matrix[i][j+1] == 'J' || matrix[i][j+1] == 'S') {
+                        connection_map.insert(Coordinate { x: j, y: i}, vec![Coordinate { x: j, y: i+1}, Coordinate { x: j+1, y:  i}]);
+                    }
+                }
+                'S' => {
+                    starting_point = Coordinate{x: j, y: i};
+                    let mut to_insert: Vec<Coordinate> = Vec::new();
+                    if i > 0 && (matrix[i-1][j] == '|' || matrix[i-1][j] == '7' || matrix[i-1][j] == 'F') {
+                        to_insert.push(Coordinate { x: j, y: i-1})
+                    }
+                    if i < matrix.len()-1 && (matrix[i+1][j] == '|' || matrix[i+1][j] == 'L' || matrix[i+1][j] == 'J') {
+                        to_insert.push(Coordinate { x: j, y: i+1})
+                    }
+                    if j > 0 && (matrix[i][j-1] == '-' || matrix[i][j-1] == 'L' || matrix[i][j-1] == 'F'){
+                        to_insert.push(Coordinate { x: j-1, y: i})
+                    }
+                    if j < matrix[i].len()-1 && (matrix[i][j+1] == '-' || matrix[i][j+1] == 'J' || matrix[i][j+1] == '7') {
+                        to_insert.push(Coordinate { x: j+1, y: i})
+                    }
+                    connection_map.insert(Coordinate { x: j, y: i}, to_insert);
+                },
+                _ => continue,
+            }
+        }
+    }
+    for i in 0..connection_map[&starting_point].len()-1 {
+        let mut current_coordinate = connection_map[&starting_point][i];
+        let mut prev_coordinate = starting_point;
+        let mut count = 1;
+        while current_coordinate != starting_point && connection_map.get(&current_coordinate).is_some() {
+            count += 1;
+            for j in 0..connection_map[&current_coordinate].len() {
+                if connection_map[&current_coordinate][j] != prev_coordinate {
+                    prev_coordinate = current_coordinate;
+                    current_coordinate = connection_map[&current_coordinate][j];
+                    break;
+                }
+            }
+        }
+        if current_coordinate == starting_point {
+            println!("{}", count/2);
+            break;
+        }
+    }
+}
diff --git a/src/10part2.rs b/src/10part2.rs
new file mode 100644
index 0000000..703eb82
--- /dev/null
+++ b/src/10part2.rs
@@ -0,0 +1,268 @@
+use std::{fs, collections::HashMap};
+
+#[derive(Eq, PartialEq, Hash, Copy, Clone, Debug)]
+struct Coordinate {
+    x: usize,
+    y: usize,
+}
+
+#[derive(Eq, PartialEq)]
+enum InLoop {
+    Loop = 1,
+    Outside = 2,
+}
+
+fn main() {
+    let file_path = "input/10input.txt";
+    let contents = fs::read_to_string(file_path).expect("should read file");
+    let mut lines = contents.lines();
+    let mut matrix: Vec<Vec<char>> = Vec::new();
+    loop {
+        match lines.next() {
+            Some(line) => {
+                matrix.push(line.chars().collect());
+            },
+            None => break,
+        }
+    }
+    let mut connection_map: HashMap<Coordinate, Vec<Coordinate>> = HashMap::new();
+    let mut starting_point: Coordinate = Coordinate { x: 0, y:  0};
+    for i in 0..matrix.len() {
+        for j in 0..matrix[i].len() {
+            match matrix[i][j] {
+                '|' => {
+                    if i > 0 && (matrix[i-1][j] == '|' || matrix[i-1][j] == '7' || matrix[i-1][j] == 'F' || matrix[i-1][j] == 'S') && i < matrix.len()-1 && (matrix[i+1][j] == '|' || matrix[i+1][j] == 'L' || matrix[i+1][j] == 'J' || matrix[i+1][j] == 'S') {
+                        connection_map.insert(Coordinate { x: j, y: i}, vec![Coordinate { x: j, y: i-1}, Coordinate { x: j, y: i+1}]);
+                    }
+                },
+                '-' => {
+                    if j > 0 && (matrix[i][j-1] == '-' || matrix[i][j-1] == 'L' || matrix[i][j-1] == 'F' || matrix[i][j-1] == 'S') && j < matrix[i].len()-1 && (matrix[i][j+1] == '-' || matrix[i][j+1] == 'J' || matrix[i][j+1] == '7' || matrix[i][j+1] == 'S') {
+                        connection_map.insert(Coordinate { x: j, y: i}, vec![Coordinate { x: j-1, y: i}, Coordinate { x: j+1, y: i}]);
+                    }
+                },
+                'L' => {
+                    if i > 0 && (matrix[i-1][j] == '|' || matrix[i-1][j] == '7' || matrix[i-1][j] == 'F' || matrix[i-1][j] == 'S') && j < matrix[i].len()-1 && (matrix[i][j+1] == '-' || matrix[i][j+1] == '7' || matrix[i][j+1] == 'J' || matrix[i][j+1] == 'S') {
+                        connection_map.insert(Coordinate { x: j, y: i}, vec![Coordinate { x: j, y: i-1}, Coordinate { x: j+1, y: i}]);
+                    }
+                }
+                'J' => {
+                    if i > 0 && (matrix[i-1][j] == '|' || matrix[i-1][j] == '7' || matrix[i-1][j] == 'F' || matrix[i-1][j] == 'S') && j > 0 && (matrix[i][j-1] == '-' || matrix[i][j-1] == 'L' || matrix[i][j-1] == 'F' || matrix[i][j-1] == 'S' ) {
+                        connection_map.insert(Coordinate { x: j, y: i}, vec![Coordinate { x: j, y: i-1}, Coordinate { x: j-1, y: i}]);
+                    }
+                }
+                '7' => {
+                    if i < matrix.len()-1 && (matrix[i+1][j] == '|' || matrix[i+1][j] == 'L' || matrix[i+1][j] == 'J' || matrix[i+1][j] == 'S') && j > 0 && (matrix[i][j-1] == '-' || matrix[i][j-1] == 'L' || matrix[i][j-1] == 'F' || matrix[i][j-1] == 'S' ) {
+                        connection_map.insert(Coordinate { x: j, y: i}, vec![Coordinate { x: j, y: i+1}, Coordinate { x: j-1, y: i}]);
+                    }
+                }
+                'F' => {
+                    if i < matrix.len()-1 && (matrix[i+1][j] == '|' || matrix[i+1][j] == 'L' || matrix[i+1][j] == 'J' || matrix[i+1][j] == 'S') && j < matrix[i].len()-1 && (matrix[i][j+1] == '-' || matrix[i][j+1] == '7' || matrix[i][j+1] == 'J' || matrix[i][j+1] == 'S') {
+                        connection_map.insert(Coordinate { x: j, y: i}, vec![Coordinate { x: j, y: i+1}, Coordinate { x: j+1, y:  i}]);
+                    }
+                }
+                'S' => {
+                    starting_point = Coordinate{x: j, y: i};
+                    let mut to_insert: Vec<Coordinate> = Vec::new();
+                    if i > 0 && (matrix[i-1][j] == '|' || matrix[i-1][j] == '7' || matrix[i-1][j] == 'F') {
+                        to_insert.push(Coordinate { x: j, y: i-1})
+                    }
+                    if i < matrix.len()-1 && (matrix[i+1][j] == '|' || matrix[i+1][j] == 'L' || matrix[i+1][j] == 'J') {
+                        to_insert.push(Coordinate { x: j, y: i+1})
+                    }
+                    if j > 0 && (matrix[i][j-1] == '-' || matrix[i][j-1] == 'L' || matrix[i][j-1] == 'F'){
+                        to_insert.push(Coordinate { x: j-1, y: i})
+                    }
+                    if j < matrix[i].len()-1 && (matrix[i][j+1] == '-' || matrix[i][j+1] == 'J' || matrix[i][j+1] == '7') {
+                        to_insert.push(Coordinate { x: j+1, y: i})
+                    }
+                    connection_map.insert(Coordinate { x: j, y: i}, to_insert);
+                },
+                _ => continue,
+            }
+        }
+    }
+    let mut loop_path: Vec<Coordinate> = Vec::new();
+    for i in 0..connection_map[&starting_point].len()-1 {
+        let mut potential_loop = vec![starting_point, connection_map[&starting_point][i]];
+        while *potential_loop.last().unwrap() != starting_point && connection_map.get(&potential_loop.last().unwrap()).is_some() {
+            for j in 0..connection_map[potential_loop.last().unwrap()].len() {
+                if connection_map[potential_loop.last().unwrap()][j] != potential_loop[potential_loop.len()-2] {
+                    potential_loop.push(connection_map[potential_loop.last().unwrap()][j]);
+                    break;
+                }
+            }
+        }
+        if *potential_loop.last().unwrap() == starting_point {
+            loop_path = potential_loop;
+            break;
+        }
+    }
+    let mut inside_loop: HashMap<Coordinate, InLoop> = HashMap::new();
+    for i in loop_path {
+        inside_loop.insert(i, InLoop::Loop);
+    }
+    for i in 0..matrix.len()/2+1 {
+        for j in 0..matrix[i].len()/2+1 {
+            if (!inside_loop.contains_key(&Coordinate{x:j, y:i}) || inside_loop[&Coordinate { x: j, y: i}] != InLoop::Loop) && ((i > 0 && inside_loop.contains_key(&Coordinate{x:j, y:i-1}) && inside_loop[&Coordinate{x:j, y:i-1}] == InLoop::Outside) || (j > 0 && inside_loop.contains_key(&Coordinate{x:j-1, y:i}) && inside_loop[&Coordinate{x:j-1, y:i}] == InLoop::Outside) || (i == 0 || j == 0)) {
+                inside_loop.insert(Coordinate{x:j, y:i}, InLoop::Outside);
+            }
+            if (!inside_loop.contains_key(&Coordinate { x: j, y: matrix.len()-i-1}) || inside_loop[&Coordinate {x:j, y:matrix.len()-i-1}] != InLoop::Loop) && ((i > 0 && inside_loop.contains_key(&Coordinate{x:j, y:matrix.len()-i}) && inside_loop[&Coordinate{x:j, y:matrix.len()-i}] == InLoop::Outside) || (j > 0 && inside_loop.contains_key(&Coordinate{x:j-1, y:matrix.len()-i-1}) && inside_loop[&Coordinate{x:j-1, y:matrix.len()-i-1}] == InLoop::Outside) || (i == 0 || j == 0)) {
+                inside_loop.insert(Coordinate{x:j, y:matrix.len()-i-1}, InLoop::Outside);
+            }
+            if (!inside_loop.contains_key(&Coordinate { x: matrix[i].len()-j-1, y: i}) || inside_loop[&Coordinate {x:matrix[i].len()-j-1, y:i}] != InLoop::Loop) && ((i > 0 && inside_loop.contains_key(&Coordinate{x:matrix[i].len()-j-1, y:i-1}) && inside_loop[&Coordinate{x:matrix[i].len()-j-1, y:i-1}] == InLoop::Outside) || (j > 0 && inside_loop.contains_key(&Coordinate{x:matrix[i].len()-j, y:i}) && inside_loop[&Coordinate{x:matrix[i].len()-j, y:i}] == InLoop::Outside) || (i == 0 || j == 0)) {
+                inside_loop.insert(Coordinate{x:matrix[i].len()-j-1, y:i}, InLoop::Outside);
+            }
+            if (!inside_loop.contains_key(&Coordinate { x: matrix[i].len()-j-1, y: matrix.len()-i-1}) || inside_loop[&Coordinate {x:matrix[i].len()-j-1, y:matrix.len()-i-1}] != InLoop::Loop) && ((i > 0 && inside_loop.contains_key(&Coordinate{x:matrix[i].len()-j-1, y:matrix.len()-i}) && inside_loop[&Coordinate{x:matrix[i].len()-j-1, y:matrix.len()-i}] == InLoop::Outside) || (j > 0 && inside_loop.contains_key(&Coordinate{x:matrix[i].len()-j, y:matrix.len()-i-1}) && inside_loop[&Coordinate{x:matrix[i].len()-j, y:matrix.len()-i-1}] == InLoop::Outside) || (i == 0 || j == 0)) {
+                inside_loop.insert(Coordinate{x:matrix[i].len()-j-1, y:matrix.len()-i-1}, InLoop::Outside);
+            }
+        }
+    }
+    for i in 0..matrix.len() {
+        for j in 0..matrix[i].len() {
+            if inside_loop.contains_key(&Coordinate { x: j, y: i}) {
+                match inside_loop[&Coordinate{x:j, y:i}] {
+                    InLoop::Outside => print!("O"),
+                    InLoop::Loop => print!("{}", matrix[i][j]),
+                }
+            } else {
+                print!("?")
+            }
+        }
+        println!("");
+    }
+    let mut matrix_expanded: Vec<Vec<char>> = Vec::new();
+    let mut unknown_list = Vec::new();
+    for i in 0..matrix.len() {
+        let mut row_a = Vec::new();
+        let mut row_b = Vec::new();
+        for j in 0..matrix[0].len() {
+            if inside_loop.contains_key(&Coordinate{x: j, y: i}) {
+                if inside_loop[&Coordinate{x: j, y: i}] == InLoop::Outside {
+                    row_a.push('O');
+                    row_a.push('O');
+                    row_b.push('O');
+                    row_b.push('O');
+                } else if inside_loop[&Coordinate{x:j, y:i}] == InLoop::Loop {
+                    match matrix[i][j] {
+                        '|' => {
+                            row_a.push('|');
+                            row_b.push('|');
+                            if (i > 0 && matrix_expanded[i*2-1][j*2+1] == 'O') || i == 0 {
+                                row_a.push('O');
+                                row_b.push('O');
+                            } else {
+                                row_a.push('.');
+                                row_b.push('.');
+                            }
+                        },
+                        '-' => {
+                            row_a.push('-');
+                            row_a.push('-');
+                            if (j > 0 && row_b[row_b.len()-1] == 'O') || j == 0 {
+                                row_b.push('O');
+                                row_b.push('O');
+                            }
+                            else {
+                                row_b.push('.');
+                                row_b.push('.');
+                            }
+                        }
+                        'L' => {
+                            row_a.push('L');
+                            row_a.push('-');
+                            if (j > 0 && row_b[row_b.len()-1] == 'O') || j == 0 {
+                                row_b.push('O');
+                                row_b.push('O');
+                            }
+                            else {
+                                row_b.push('.');
+                                row_b.push('.');
+                            }
+                        },
+                        'J' => {
+                            row_a.push('J');
+                            if (j > 0 && row_b[row_b.len()-1] == 'O') || j == 0 || (i > 0 && matrix_expanded[i*2-1][j*2+1] == 'O') || i == 0 {
+                                row_a.push('O');
+                                row_b.push('O');
+                                row_b.push('O');
+                            }
+                            else {
+                                row_a.push('.');
+                                row_b.push('.');
+                                row_b.push('.');
+                            }
+                        },
+                        '7' => {
+                            row_a.push('7');
+                            row_b.push('|');
+                            if (i > 0 && matrix_expanded[i*2-1][j*2+1] == 'O') || i == 0 {
+                                row_a.push('O');
+                                row_b.push('O');
+                            } else {
+                                row_a.push('.');
+                                row_b.push('.');
+                            }
+                        },
+                        'F' => {
+                            row_a.push('F');
+                            row_a.push('-');
+                            row_b.push('|');
+                            row_b.push('.');
+                        },
+                        'S' => {
+                            row_a.push('S');
+                            row_a.push('-');
+                            row_b.push('|');
+                            row_b.push('.');
+                        }
+                        _ => {},
+                    }
+                }
+            } else {
+                    row_a.push('.');
+                    row_a.push('.');
+                    row_b.push('.');
+                    row_b.push('.');
+                }
+        }
+        println!("{:?}\n{:?}", row_a, row_b);
+        matrix_expanded.push(row_a);
+        matrix_expanded.push(row_b);
+    }
+    let mut y = matrix_expanded.len() -2;
+    while y > 0 {
+        let mut x = matrix_expanded[y].len() - 2;
+        while x > 0 {
+            if matrix_expanded[y][x] != '.' {
+                x -= 1;
+                continue;
+            } else if matrix_expanded[y][x-1] == 'O' || matrix_expanded[y-1][x] == 'O' || matrix_expanded[y][x+1] == 'O' || matrix_expanded[y+1][x] == 'O' {
+                matrix_expanded[y][x] = 'O';
+                x -= 1;
+            } else {
+                unknown_list.push(Coordinate{x, y});
+                x -= 1;
+            }
+        }
+        y -= 1;
+    }
+    let mut iters_since_last_update = 0;
+    while unknown_list.len() > iters_since_last_update {
+        let current = unknown_list.pop().unwrap();
+        if matrix_expanded[current.y][current.x-1] == 'O' || matrix_expanded[current.y-1][current.x] == 'O' || matrix_expanded[current.y][current.x+1] == 'O' || matrix_expanded[current.y+1][current.x] == 'O' {
+            matrix_expanded[current.y][current.x] = 'O';
+            iters_since_last_update = 0;
+        } else {
+            iters_since_last_update += 1;
+            unknown_list.insert(0, current);
+        }
+    }
+    let mut count = 0;
+    while unknown_list.len() > 0 {
+        let current = unknown_list.pop().unwrap();
+        if current.x % 2 == 0 && current.y % 2 == 0 {
+            count+=1;
+        }
+    }
+    println!("{}", count);
+}