Day 4 problems complete

crates/day_4/data/day4_input

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+SMSSSSSXSAMAMAXMAMMXMMXSAAAASAMASMMASAXSASASAXMMMXSAMMMSMSMMXMAXAMSAAAMSSSSSMMMAMMAMXMXXSAMSSMAXMAXXAMXMSASMMMSMAXASMMMAMAMMASAMMXMMMSMMXAAM
+AAAAXAMMXMSAMASMSSSMAXAMSMSMSAMXXAMAMXMMASAMMXSMMAMASAAAXAMSMSSMSSMMXMMMXAAMXAMXMMMMMAMMMAMXXMASXSMMMAXSAMAMAAAAAMXMAXXAMXMMAMXXAMSAMXMSSSMS
+MMMSAMXSAMXMAMXMAAMMXMAXAXMXSXMASAMXXASMMMAMSAMAMMSASMSMSASAAXAAXAXSAMXMMMMMSXXAMSMMSASXSSMXMAMMAAAASXMXSXMXMXMMMSSSMMSSSMSMSSSMSMSAMMAXAAXX
+XSXMMSASASXMMXAMMSMAAMMMXMXAMAMXMXMASMXAMXSMMASXMXMAMAMXSXXMSSMMMMAMMXAAXAMASAMXAAAXSASXAAAAAAAMSMSXSASAMXXMMXSAAXMASAMXAMXMAAAAMMSAMMSMXMMX
+AMAMAMASAMAASMXXAXMSXSAXAMSSMAXSAMXXAXSXMAMASMMXMASAMAMAMMXXXMMAMXASXSASXSMASMASMMMMMMMMAMSMSSMXXXXAMAMXXXAXAASMMMSAMXXSXMAMMSMMMAMAMAXASXSS
+AMAMAMXMMMSMMASMASAAAMXMSXAASXMMMMXMXXMASAMAMXXSMXSXSAMASMSMAMXAXSMSASAXAXMXMXMSASAMAAXXAXAAAXMSMSMSMSMSMSMMMMMAAXXXSMMSASXSAMXXMXSAMMXMMAAX
+MSMSSSMMSMAMMAMMAMXMMMSXXMSMMSXSAAASAMSAMMMAXMASXXMASASAAAASAMSSXXXMAMAMSXSMSSXMAMASXSMMXSMSSSMAAAAAAAAAAXAAXXSSMSMAXXASXSXMASAXSAMMMXSAMMMM
+MAXAAAAAAMASMXSXSMMAAAMAXAXMAXMSMXMMAXXXMSASASASAAXXXAXMMSMSMMAMXMSMMMSMXAXAMXAMAMXMMMAAMMAAAAXMSMSMSMSMXSXMXAMXAAAMMMXSASAMXMAAMASMAAMAXAAA
+SSSMSMMXXXAMMAMMAMSSMASMMMMMAMMXSSSSMMMMXAMXASASAMXSMMMXAMASMMMSAAAAMAAAMSMSMAAMSXSAASMMSMMMSMMXMAMXAXXMASMXAMXMMMASXAAMASXMXMMMSAMMMSXSSSXS
+AMAAAASXSMSSMMSAMMAXMXSAAMSMSSXAAMMASAXMASXSAMMMXMMXAMSASMAMMAXXXMXMMXMXAXMXAMXXXASMMAMAXAXAXXXXMAMSMSAMXSAMSSSXXSAXAXXMAMMAAXXMMASXXXAAXXMM
+SSMMAMMAAXMAXAMXXMASMXXMXXSAASMMMSSMMXSXAXAMXMASXSXXXMAAXMASXXSXSSMSMSAMXMMSXMMSMMMSMMMXSMMSSMSMSSMMXSAMMMXMAAAXXMMXSSMMASMSSSMASAMXAMMMMSAA
+XAMMSSMXMMSMMMSMSXAAXMXMMMMSMXXSAXAXMASMSMXMASAXMXAMSSMMMSAMXAMAXAAAASXSAAAXAAAAAAAAMXMMXMAXAAMAAMAMXSAMSASMMSMMXAAAMAXSAXXXAAMAMASMAMSAAAXM
+SAMAAMXXMXXXAXAAXMMSAMASASAMXMAMXSSMSXXAAAASXMASMMXMAAAMXXASMMMSMMSMXMAXMMMXSMSSSMSXMAAMAMMSMMMMMSXMXMXMMASXMXXAXAMMSMMSSSMMSMMSSXXXAXXMSSSX
+SSMMMSAMXSXSSSMSMSAXASASMMMXAAMXMMAASXMSMXMMAMAAXAAMSXMXXXMSASMXAXXASMSMASXAXAMXAAMXSSXSAMXAMXXSAMASMXMMMAMASXSSSMXAAXXXAXAAAXAMMMMSMSMAAAXX
+SXSAMXMMASXMMXXAAMASAMXMMSSMMXSAASMMMAMAAASMSMSSSSMXMASMMMXSAMMSSMSAMAXSAMMMSAMXSMSXXAASAMSAMSMMASAMXAMXMAMAMXAAAXXSXMSAMMXSAMXMAAAAAAMXMMMM
+SAMMSASMAXAMSSMMSSMMAMAXSASASASXMXXASMMMSMSAAAMMAAXMSAMAAAMMSMAAXASAMXMMXSXXSMMMXAXXMMMMMAMAMAXSMMMSSXSAXMMSMSMSMMMXMSXAXSXMMAXSSMSMSMSMMXSA
+SASMSASMMSAMASAAXXASXMMMMASXMASMAMSMMMSXXXMMMMMXSMMMMMSSMSAAMSMXSXXMXSMAAXMMMAASMMMAXMMAMMSSSXXXAASMMASASXAAAMAMAMAXMSSXMASMSMMMMAAAXMXMAAXX
+SAMXMXMXMAMMASMMMSMMMAMSMMMAMAMAAAAXAAMXMXMAMXMAAAXXAAAAAMMXMXMMXMASAMXMXXXAXXMSAAXMSAXXMXSAXXXSMMXAMXMAMMSMSMAMAMSSMXXMASXMASAMMSMSSMAAMMSA
+MAMMMSXXSMXMXXXSAXAASAAAXAXAMXSSSSSSMMSAAXSASAMMSMMSMMXMMMXMXAMMAXAMMXAMSMSSSMXSMMSXXAXSXMMMMSXAAASMMMMSMAXAMMASAMXAXAMXMAXSASMSAAXXAMMSMAMM
+XMMSAAMMAXXAMXMMXXXMMAXASXSMSMMMMAXMXAMAMXMXSAMXMAMXAASMXXXAXMAXMMSSSMMXAAAAAMAMAMXMMXMSAXMSAMSMMMSAAAAAMMMAMXAMAXXAMMSMSSMMXSAMMSSSMMXAMASX
+MSAMXSAAMMSSXASMMSSSXMSMAAXMAMAAMMMMMSMSXSMXMMMMMAMSXMSAAASXSSMMAMAAMASMMSMMMMXMAMAMAMMSAMXMAXAMSASMSMSSXXMXMMSMSMSSMXAMAAASASMXMXAAAASXSXSM
+AMASXMMSXASXSMSAAAASAAAMMMMSASAXXAASAXAMASMSXAXXMAMAMXXMMMXAAAASAMMSMAMAAXXSMASXMMMSMMAMXMASXMAXMAXXMAXAMSSSMAXAAAMAMSMMSSMMXXXXMASMMMSXMAMM
+XSXMXAAXMXMAMSSMMMXSMSXSMAAMASAMSSXSAMXMXMASXMMMSMSMASXSXXXMMMMXASXMMXXMMMAAMAMMSAMAAMAMAMXSXMMMSMSMMSMMMAAXMASMMMMMMMAAAAXSMSMXSAMXAXXAMAMM
+XMMMSMMSXMSSMAXXXXXXAXMAXMSSMMMMAMAMXMXMSMMMMSSMAXAASAAMSAMXXMXSASAMASXASMMMMXSASASXSSMMSSMMMXSMXAAXAAAXMMSMMASAXXMXMSMMSSMMAAAAMAXSAXSXSMSS
+SAAXAMSXMXAMXXSXMMSMMMMSSMMAMXMMXSMMMXXXAAMMAAAXMSSSMSXMASXMASXAXXAMAMXAMAAXMMMAXAMXMAMAMAAXSASMMSMXXSSMXAAMMASAMMMMMAMXAMAMSMSMSMMSMMSAMAAX
+SSMSSXSAMMXXAMMAXMAAAXSAAASXMSXSMSAMSAMSSMMMMXSMXAXXAXMXXXMXAAMMSSMMASMMSSMXXAMMMSMMSAMXSSMXMASXAAXSXXMMMMMXMAXXXXAAXAXMMMMXAXAMXAAMAAMAMMMS
+MAMAMMSAMSSSMASAMSMSMSAASMMMASASASAMMAXAAXXSMAMXMAMMAMMSMSAMXMAXAAASAXAMXAAASXXAXAAAMASAXMASMAMMSMSAMXAMXMAXMSMMMSSSSSSMMASXMSXSSMMMMMSXMAXX
+MSMXXAMAMAAASAMXXXMAMMMMMAXMAMXMAMMMSMMSSMXXMASAXAMSAMXSAMASXSSXSXMMMSXMSMMMAMSMSSSMSXMAMSMSMAMMAMXMASMMSAXSAAAAAMAMAAAMSMSAMAAMAXMASMSMSSMX
+MXSSMXMAMMSMMMXSMMSASAAAMXXMASAMXMXAMSAAMAAMMMSAMXXXASAMMSAMMAAAMSXMMAMMXSAXXXAMXAAAAXMSMAXXMSSMXSAXMAAXMAMXMSSMAMAMMMMMAASXMMXSAMMAMAXAAAAS
+MSAMXXSASXAMMMXMAXSASMSSSSXSASMSMSMMSMMSXXXAAMXMASMMXMASAMMSMMMAMAXXMASMAMMASMXSMMMMMAMASXSXAMAAMMMMMMSXMXMAXMAMXSASAMASMMMASMASXSSSMMMMSSMS
+MMAMAXXAMXXSAMAMSMMMMAMAAAAMXSAAAMSXAXMAMXMMMXAMXMAMAXXMASXSXMMXSMXMAMXMAMXAMAMAMSMXXXSMSXSAMSMMMAAASXXAMMAMXSMMMSMSASASMMSAMMAMMMAAXSAMAAAX
+XSSMXSMSMMMSMXSMMXAAMAMMMMMMMMMMXXMMMMXAAAAAMMMXAXAMXMMXAMXMXMAASXSSXSXSXSMXMAAXXAMXMXMXMASMMAAMSMSMSASXMASMMAXXAMASAMMMAAMASMASMMSMMSASMMSM
+AMAXMAXAAAAXAAXAMSSSSXSAMXSAAMMSMAMSXMSSSSSXSASAMSASXMSAASAMASMMXAAAASAMXSASXSSSSXXASAMSMMMAMXSMMAXAMAMXMAXAXMSMSMAMAMASMMSAMXASAMXAASMMXMAM
+ASAMXMSSSMSMMASAMXXXAAXXMASXXSAASAMAAMXAAAAASAMAMSAMXAMSMSASASAMMSMMMMAXAMSMAMAXXMSMSASAAXSSMMMAMSMMMAMXMASAMXAAAMXMASAXSAMXSMMSAMSMMSSXAAMS
+XSXSXXXMXAXMSMSMMSMMMMMSMMSMSMXMSXSSSMMMMMMMMSMXMMSMMMMMXSXMASAMXMASXSXMXSAMMMXMAXAASXMXSMAMAXSAMXMASMSAMXSMMSMSMSSMXMASXXSAMXMSMMSAMXXSXSXA

crates/day_4/data/day4_test_input

@@ -0,0 +1,10 @@
+MMMSXXMASM
+MSAMXMSMSA
+AMXSXMAAMM
+MSAMASMSMX
+XMASAMXAMM
+XXAMMXXAMA
+SMSMSASXSS
+SAXAMASAAA
+MAMMMXMMMM
+MXMXAXMASX

crates/day_4/src/day_4.rs

@@ -8,6 +8,7 @@
 *	@brief		Advent of Code 2024 day 4 problems
 ******************************************************************************/
 
+use crate::word_grid::WordGrid;
 use ::solver_base::solver_base::{Solver, DataSet, RunMode};
 use utils::utils;
 
@@ -16,6 +17,7 @@ pub struct Day4
 	data_set: DataSet,
 	run_mode: RunMode,
 	do_debug_prints: bool,
+	word_grid: Option<WordGrid>,
 	pub final_result: i32,
 }
 
@@ -26,18 +28,25 @@ impl Day4
 {
 	pub fn new() -> Day4
 	{
-		Day4 { data_set: DataSet::Test, run_mode: RunMode::FirstCase, do_debug_prints: false, final_result: 0 }
+		Day4 { data_set: DataSet::Test, run_mode: RunMode::FirstCase, do_debug_prints: false, word_grid: None, final_result: 0 }
 	}
 
 	fn solve_first_case(self: &mut Self) -> String
 	{
+		if let Some(word_grid) = &mut self.word_grid
+		{
+			self.final_result = word_grid.find_word("XMAS")
+		}
 
 		self.final_result.to_string()
 	}
 
 	fn solve_second_case(self: &mut Self) -> String
 	{
-
+		if let Some(word_grid) = &mut self.word_grid
+		{
+			self.final_result = word_grid.find_x_mas();
+		}
 
 		self.final_result.to_string()
 	}
@@ -66,13 +75,20 @@ impl Solver for Day4
 				DataSet::Test => format!("{}/data/day4_test_input", dir),
 				DataSet::TestAlt => panic!("Day 4: There is no TestAlt input file!"), //format!("{}/data/day2_test_input", dir),
 				DataSet::Full => format!("{}/data/day4_input", dir),
-				//DataSet::BALLS => panic!("BALLS"),
 			};
 		
 
-		let _data = utils::load_data(&data_filename);
+		let data = utils::load_data(&data_filename);
 
-		// TODO: Day4::init
+		self.word_grid = Some(WordGrid::new(&data));
+		
+		if self.do_debug_prints
+		{
+			if let Some(word_grid) = &self.word_grid
+			{
+				word_grid.print();
+			}
+		}
 
 	}
 

crates/day_4/src/lib.rs

@@ -1,2 +1,3 @@
 
 pub mod day_4;
+pub mod word_grid;

crates/day_4/src/word_grid.rs

@@ -0,0 +1,271 @@
+
+
+#[derive(Copy, Clone, Debug)]
+struct IdxPoint
+{
+	i: usize,
+	j: usize,
+}
+
+impl IdxPoint
+{
+	fn new(i: usize, j: usize) -> IdxPoint
+	{
+		IdxPoint { i, j }
+	}
+
+	fn offset_by(self: &mut IdxPoint, offset: Point) -> IdxPoint
+	{
+		self.i = ((self.i as i32) + offset.x) as usize;
+		self.j = ((self.j as i32) + offset.y) as usize;
+		*self
+	}
+
+	fn new_with_offset(self: &IdxPoint, offset: Point)-> IdxPoint
+	{
+		let i = ((self.i as i32) + offset.x) as usize;
+		let j = ((self.j as i32) + offset.y) as usize;
+
+		IdxPoint {i, j }
+	}
+}
+
+#[derive(Copy, Clone, Debug)]
+struct Point
+{
+	x: i32,
+	y: i32,
+}
+
+impl Point
+{
+	fn new(x: i32, y: i32) -> Point
+	{
+		Point { x, y }
+	}
+}
+
+
+
+#[derive(Clone, Debug)]
+pub struct WordGrid
+{
+	grid: Vec<Vec<char>>
+}
+
+impl WordGrid
+{
+	pub fn new(input: &str) -> WordGrid
+	{
+		WordGrid { grid: parse_input(input) }
+	}
+
+	pub fn print(self: &WordGrid)
+	{
+		print!("Word Grid:");
+		for row in &self.grid
+		{
+			println!();
+			for c in row
+			{
+				print!("{}", c);
+			}
+		}
+		println!();
+	}
+
+
+	pub fn find_x_mas(self: &WordGrid) -> i32
+	{
+	
+		let neighbor_offsets = get_x_neighbor_offsets();
+		let mut num_occurrences_found = 0;
+
+		for (i, row) in self.grid.iter().enumerate()
+		{
+			for (j, c) in row.iter().enumerate()
+			{
+				if *c as u8 == b'A'
+				{
+					// First make sure all four neighbors exist
+					// TOP LEFT
+					let top_left = IdxPoint::new(i, j).offset_by(neighbor_offsets[0]);
+					if !self.has_neighbor(IdxPoint::new(i, j), neighbor_offsets[0])
+					{
+						continue;
+					}
+
+					// TOP RIGHT
+					let top_right = IdxPoint::new(i, j).offset_by(neighbor_offsets[1]);
+					if !self.has_neighbor(IdxPoint::new(i, j), neighbor_offsets[1])
+					{
+						continue;
+					}
+					
+					// BOTTOM LEFT
+					let bottom_left = IdxPoint::new(i, j).offset_by(neighbor_offsets[2]);
+					if !self.has_neighbor(IdxPoint::new(i, j), neighbor_offsets[2])
+					{
+						continue;
+					}
+
+					// BOTTOM RIGHT
+					let bottom_right = IdxPoint::new(i, j).offset_by(neighbor_offsets[3]);
+					if !self.has_neighbor(IdxPoint::new(i, j), neighbor_offsets[3])
+					{
+						continue;
+					}
+
+					// Check that they contain valid values
+					if self.grid[top_left.i][top_left.j] as u8 != b'M' && self.grid[top_left.i][top_left.j] as u8 != b'S'
+					{
+						continue;
+					}
+
+					if self.grid[top_right.i][top_right.j] as u8 != b'M' && self.grid[top_right.i][top_right.j] as u8 != b'S'
+					{
+						continue;
+					}
+
+					if self.grid[bottom_left.i][bottom_left.j] as u8 != b'M' && self.grid[bottom_left.i][bottom_left.j] as u8 != b'S'
+					{
+						continue;
+					}
+
+					if self.grid[bottom_right.i][bottom_right.j] as u8 != b'M' && self.grid[bottom_right.i][bottom_right.j] as u8 != b'S'
+					{
+						continue;
+					}
+
+					// Check that the diagonal corners have opposite values
+					if self.grid[top_left.i][top_left.j] as u8 == self.grid[bottom_right.i][bottom_right.j] as u8
+					{
+						continue;
+					}
+
+					if self.grid[top_right.i][top_right.j] as u8 == self.grid[bottom_left.i][bottom_left.j] as u8
+					{
+						continue;
+					}
+
+					num_occurrences_found += 1;
+				}
+			}
+		}
+
+		num_occurrences_found
+	}
+
+	// Returns the number of times the given word was found in the grid
+	pub fn find_word(self: &mut WordGrid, word_str: &str) -> i32
+	{
+		let word: Vec<u8> = word_str.as_bytes().into_iter().map(|x| *x).collect();
+		let neighbor_offsets = get_neighbor_offsets();
+		let mut num_occurrences_found = 0;
+
+		for (i, row) in self.grid.iter().enumerate()
+		{
+			for (j, c) in row.iter().enumerate()
+			{
+				if *c as u8 == word[0]
+				{
+					for n in neighbor_offsets
+					{
+						let neighbor = IdxPoint::new(i, j).offset_by(n);
+						if self.has_neighbor(IdxPoint::new(i, j), n)
+						{
+							if self.search_direction(neighbor, n, &word, 1)
+							{
+								num_occurrences_found += 1;
+							}
+						}
+					}
+				}
+			}
+		}
+
+		num_occurrences_found
+	}
+
+	fn search_direction(self: &WordGrid, start: IdxPoint, direction: Point, word: &Vec<u8>, next_char_idx: usize) -> bool
+	{
+		if self.grid.len() <= start.i
+		{
+			panic!("i is out of bounds");
+		}
+
+		if self.grid[start.i].len() <= start.j
+		{
+			panic!("j is out of bounds")
+		}
+
+		if next_char_idx >= word.len()
+		{
+			panic!("next is out of bounds")
+		}
+
+		if self.grid[start.i][start.j] as u8 == word[next_char_idx]
+		{
+			if next_char_idx == word.len() - 1
+			{
+				return true;
+			}
+
+			let next_idx = start.new_with_offset(direction);
+			if self.has_neighbor(start, direction)
+			{
+				return self.search_direction(next_idx, direction, word, next_char_idx + 1);
+			}
+		}
+
+		false
+	}
+
+	fn has_neighbor(self: &WordGrid, at: IdxPoint, offset: Point) -> bool
+	{
+		let neighbor_i = at.i as i32 + offset.x;
+		let neighbor_j = at.j as i32 + offset.y;
+
+		neighbor_i >= 0 &&
+		neighbor_j >= 0 &&
+		neighbor_i < self.grid.len().try_into().unwrap() &&
+		neighbor_j < self.grid[at.i].len().try_into().unwrap()
+	}
+
+}
+
+//|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
+//				HELPERS
+//|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
+fn parse_input(input: &str) -> Vec<Vec<char>>
+{
+	let mut grid: Vec<Vec<char>> = vec![];
+	for (i, row) in input.split("\n").enumerate()
+	{
+		grid.push(vec![]);
+		for c in row.as_bytes()
+		{
+			grid[i].push(*c as char);
+		}
+	}
+
+	grid
+}
+
+fn get_neighbor_offsets() -> [Point; 8]
+{
+	[
+		Point::new(-1, -1 ), Point::new(0, -1), Point::new(1, -1),
+		Point::new(-1, 0 ), 						   Point::new(1, 0),
+		Point::new(-1, 1 ),  Point::new(0, 1),  Point::new(1, 1),
+	]
+}
+
+fn get_x_neighbor_offsets() -> [Point; 4]
+{
+	[
+		Point::new(-1, -1 ),  Point::new(1, -1),
+		
+		Point::new(-1, 1 ),    Point::new(1, 1),
+	]
+}

src/main.rs

@@ -10,6 +10,7 @@
 use day_1::day_1::Day1;
 use day_2::day_2::Day2;
 use day_3::day_3::Day3;
+use day_4::day_4::Day4;
 use solver_base::solver_base::{Solver, DataSet, RunMode};
 
 fn main() 
@@ -25,6 +26,8 @@ fn main()
     let day1_result = day_1.solve();
     println!("Day1 Part 2 Final Result: {}", day1_result);
 
+    println!("-------------------------");
+
 
     // DAY 2
     let mut day_2 = Day2::new();
@@ -37,6 +40,8 @@ fn main()
     let day2_result = day_2.solve();
     println!("Day2 Part 2 Final Result: {}", day2_result);
 
+    println!("-------------------------");
+
     // DAY 3
     let mut day_3 = Day3::new();
     day_3.init(DataSet::Full, RunMode::FirstCase, false);
@@ -48,4 +53,19 @@ fn main()
     let day3_result = day_3.solve();
     println!("Day3 Part 2 Final Result: {}", day3_result);    
 
+    println!("-------------------------");
+
+    // DAY 4
+    let mut day_4 = Day4::new();
+    day_4.init(DataSet::Full, RunMode::FirstCase, false);
+    let day4_result = day_4.solve();
+    println!("Day4 Part 1 Final Result: {}", day4_result);
+
+    let mut day_4 = Day4::new();
+    day_4.init(DataSet::Full, RunMode::SecondCase, false);
+    let day4_result = day_4.solve();
+    println!("Day4 Part 2 Final Result: {}", day4_result);   
+    
+    println!("-------------------------");
+
 }