days 12 through 15

day12/day12.py

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+import re
+import argparse
+def search(line, groups):
+	#print("searching {} for {}".format(line, groups))
+	#find the first ?
+	if not precheck(line, groups): 
+		return
+	if check(line, groups): 
+		#print("found a solutioN!")
+		yield line
+		return
+	
+	if '?' not in line:
+		return
+
+	#print("delving into subtree {}".format(line.replace('?', '#', 1)))
+	yield from search(line.replace('?', "#", 1), groups)
+	yield from search(line.replace('?', ".", 1), groups)
+
+def precheck(line, groups):
+    expected_hits = sum(groups)
+    if line.count('#') > expected_hits:
+        # if there are more hits in our candidate than the expected number, then this is a bad branch.
+        # return false to skip it.
+        #print("too many #")
+        return False
+    if line.count('.') > len(line) - expected_hits:
+        # if there are moroe confirmed empties in our candidate than len - expected_hits, then this is a bad branch.
+        # return false to skip it.
+        #print("too many .")
+        return False
+    return True
+
+def check(line, groups):
+	if '?' in line:
+		return False
+	line_list = list(map(lambda x: len(x), line.replace(".", " ").split()))
+	if len(line_list) == len(groups):
+		return all(map(lambda x: x[0] == x[1], zip(line_list, groups)))
+	return False
+	return groups == line_list
+
+
+
+
+parser = argparse.ArgumentParser()
+parser.add_argument("filename", help="the file from which to take data")
+args = parser.parse_args()
+
+with open(args.filename, "r") as f:
+	line_re = re.compile("([.?#]*) ([0-9,]*)")
+	s = 0
+	for l in f.readlines():
+		m = line_re.match(l)
+		line = m.group(1)
+		groups = list(map(int, m.group(2).split(',')))
+		#print("line is {} and groups are {}".format(line, groups))
+		#for option in search(line, groups):
+		#	print(option)
+
+		x = len(list(search(line,groups)))
+		#print("there are {} solutinos".format(x))
+		s += x
+	print("the total solutionss are {}".format(s))
+
+
+print("and noow for part b")
+
+
+with open(args.filename, "r") as f:
+	line_re = re.compile("([.?#]*) ([0-9,]*)")
+	s = 0
+	for l in f.readlines():
+		m = line_re.match(l)
+		line = m.group(1)
+		line = line + "?" + line + "?" + line + "?" + line + "?" + line
+		groups = list(map(int, m.group(2).split(',')))
+		groups = groups * 5
+		print("line is {} and groups are {}".format(line, groups))
+		#for option in search(line, groups):
+		#	print(option)
+
+		x = len(list(search(line,groups)))
+		print("there are {} solutinos".format(x))
+		s += x
+	print("the total solutionss are {}".format(s))

day13/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day13"
+version = "0.1.0"

day13/Cargo.toml

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+[package]
+name = "day13"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day13/src/main.rs

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+use std::iter::*;
+use std::fs;
+use std::env;
+use std::collections::HashSet;
+
+fn main() {
+    println!("Hello, AoC day 11!");
+
+    let args: Vec<String> = env::args().collect();
+    if args.len() != 2 {
+        println!("wrong number of arguments!");
+        std::process::exit(1);
+    }
+
+    let file_path = &args[1];
+
+    let contents = fs::read_to_string(file_path)
+        .expect("Should have been able to read the file");
+
+
+    let mut grids: Vec<Vec<String>> = Vec::new();
+    
+    // let's build that grid
+    let mut current_grid: Vec<String> = Vec::new();
+    for line in contents.lines() {
+        if line.trim().is_empty() {
+            grids.push(current_grid);
+            current_grid = Vec::new();
+        } else {
+            current_grid.push(line.to_string());
+        }
+    }
+    grids.push(current_grid);
+
+    // now that we've got the whole input file sorted, let's process things!
+    let mut s = 0;
+
+    for g in &grids {
+        println!("starting on a grid");
+
+        let mirrors = find_mirrors(g);
+        let mirrors_vert = find_mirrors(&transpose(g));
+        print_map(g);
+        println!("found mirrors at columns {mirrors:?}");
+        println!("found mirrors at rows {mirrors_vert:?}");
+        s += mirrors.iter().sum::<usize>();
+        s += 100*mirrors_vert.iter().sum::<usize>();
+    }
+
+    println!("sum of mirror offsets is {s}");
+
+    println!("now for part 2...");
+
+    s=0;
+    for g in &grids {
+        let original_mirrors = find_mirrors(g);
+        let original_mirrors_vert = find_mirrors(&transpose(g));
+        for (y, row) in g.iter().enumerate() {
+            for x in 0..row.len() {
+                //println!("smudging at {y}, {x}.");
+                let new_grid = smudge(g, y, x);
+                let mut mirrors: HashSet<usize> = find_mirrors(&new_grid);
+                for x in &original_mirrors {
+                    mirrors.remove(&x);
+                }
+                let mut mirrors_vert: HashSet<usize> = find_mirrors(&transpose(&new_grid));
+                for x in &original_mirrors_vert {
+                    mirrors_vert.remove(&x);
+                }
+                let n = mirrors.iter().sum::<usize>();
+                let m = mirrors_vert.iter().sum::<usize>();
+                //println!("found {mirrors:?} vertical and {mirrors_vert:?} horizontal mirrors.");
+                s += n + 100*m;
+            }
+        }
+    }
+    s = s/2;
+    println!("the sum was {s}");
+}
+
+
+fn smudge(g: &Vec<String>, i: usize, j: usize) -> Vec<String> {
+    let mut output = Vec::new();
+
+    for (y, row) in g.iter().enumerate() {
+        if y != i {
+            output.push(row.clone());
+        } else {
+            let mut new = row.clone();
+            match new.remove(j) {
+                '.' => new.insert(j, '#'),
+                '#' => new.insert(j, '.'),
+                _ => panic!("ahjhhhhfslkjf")
+            };
+            output.push(new);
+        }
+    }
+
+    return output;
+}
+
+fn print_map(g: &Vec<String>) {
+    for row in g {
+        println!("{}", row);
+    }
+}
+
+fn find_mirrors(mat: &Vec<String>) -> HashSet<usize> {
+    let mut mirrors: HashSet<usize> = mirror_candidates(&mat[0]);
+    for row in mat {
+        let candidates = mirror_candidates(row);
+        mirrors.retain(|x| candidates.contains(x));
+    }
+    return mirrors;
+}
+fn mirror_candidates(row: &String) -> HashSet<usize> {
+    let mut output: HashSet<usize> = HashSet::new();
+    for i in 0..row.len()-1 {
+        // try after character i
+        let mut works = true;
+        for x in 0..(row.len()/2) {
+            if (i < x) || (i+1+x >= row.len()) {break;}
+            if row.chars().nth(i-x) != row.chars().nth(i+1+x) {works = false;}
+        }
+        if works {output.insert(i+1);}
+    }
+    return output;
+}
+
+fn transpose(mat: &Vec<String>) -> Vec<String> {
+    let mut output = Vec::new();
+    for i in 0..mat[0].len() {
+        let mut l: String = String::from("");
+        for row in mat {
+            l.push_str(&row.chars().nth(i).expect("this had better work").to_string());
+        }
+        output.push(l);
+    }
+    return output;
+}

day13/target/.rustc_info.json

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+{"rustc_fingerprint":11672801278650259402,"outputs":{"4614504638168534921":{"success":true,"status":"","code":0,"stdout":"rustc 1.69.0 (84c898d65 2023-04-16)\nbinary: rustc\ncommit-hash: 84c898d65adf2f39a5a98507f1fe0ce10a2b8dbc\ncommit-date: 2023-04-16\nhost: x86_64-apple-darwin\nrelease: 1.69.0\nLLVM version: 15.0.7\n","stderr":""},"15729799797837862367":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.dylib\nlib___.dylib\nlib___.a\nlib___.dylib\n/Users/shoofle/.rustup/toolchains/stable-x86_64-apple-darwin\noff\npacked\nunpacked\n___\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"\"\ntarget_family=\"unix\"\ntarget_feature=\"cmpxchg16b\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_feature=\"sse3\"\ntarget_feature=\"ssse3\"\ntarget_has_atomic=\"128\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"macos\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"apple\"\nunix\n","stderr":""}},"successes":{}}

day13/target/CACHEDIR.TAG

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+Signature: 8a477f597d28d172789f06886806bc55
+# This file is a cache directory tag created by cargo.
+# For information about cache directory tags see https://bford.info/cachedir/

day13/target/debug/.fingerprint/day13-77b2a47bbbbb8c09/bin-day13

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+7e2b4abee0c673f5

day13/target/debug/.fingerprint/day13-77b2a47bbbbb8c09/bin-day13.json

@@ -0,0 +1 @@
+{"rustc":3659767333214291318,"features":"[]","target":14090744556205886698,"profile":11736316127369858332,"path":1684066648322511884,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/day13-77b2a47bbbbb8c09/dep-bin-day13"}}],"rustflags":[],"metadata":7797948686568424061,"config":2202906307356721367,"compile_kind":0}

day13/target/debug/.fingerprint/day13-77b2a47bbbbb8c09/invoked.timestamp

@@ -0,0 +1 @@
+This file has an mtime of when this was started.

day13/target/debug/day13.d

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+/Users/shoofle/Projects/aoc_2023/day13/target/debug/day13: /Users/shoofle/Projects/aoc_2023/day13/src/main.rs

day13/target/debug/deps/day13-77b2a47bbbbb8c09.d

@@ -0,0 +1,5 @@
+/Users/shoofle/Projects/aoc_2023/day13/target/debug/deps/day13-77b2a47bbbbb8c09: src/main.rs
+
+/Users/shoofle/Projects/aoc_2023/day13/target/debug/deps/day13-77b2a47bbbbb8c09.d: src/main.rs
+
+src/main.rs: