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#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_mut)]
use std::collections::HashMap;
use std::env;
use std::fs::File;
use std::io::Read;
fn dfs(design: &str, tokens: &Vec<&str>) -> i64 {
if design.len() == 0 {
return 1;
}
for t in tokens {
if design.starts_with(t) {
let ret = dfs(&design[t.len()..], tokens);
if ret == 1 {
return 1;
}
}
}
return 0;
}
fn dfs2<'a>(design: &'a str, tokens: &Vec<&str>, lut: &mut HashMap<&'a str, i64>) -> i64 {
if design.len() == 0 {
return 1;
}
if let Some(n) = lut.get(design) {
return *n;
}
let mut ret = 0;
for t in tokens {
if design.starts_with(t) {
let s = &design[t.len()..];
let n = dfs2(s, tokens, lut);
lut.insert(s, n);
ret += n;
}
}
return ret;
}
fn main() {
let args: Vec<String> = env::args().collect();
let filename = if args.len() == 1 {
"in/".to_owned() + args[0].split('/').last().unwrap() + ".pzl"
} else {
args[1].clone()
};
let mut f = File::open(filename).expect("cannot open file");
let mut content = String::new();
f.read_to_string(&mut content).expect("cannot read file");
let (para1, para2) = content.trim_end().split_once("\n\n").unwrap();
let mut tokens: Vec<&str> = Vec::new();
for s in para1.split(", ") {
tokens.push(s);
}
let mut designs: Vec<&str> = Vec::new();
for s in para2.split("\n") {
designs.push(s);
}
//println!("{:?}", tokens);
//println!("{:?}", designs);
let mut res1 = 0;
let mut res2 = 0;
for d in designs {
res1 += dfs(d, &tokens);
let mut lut: HashMap<&str, i64> = HashMap::new();
res2 += dfs2(d, &tokens, &mut lut);
}
println!("res1: {}", res1);
println!("res2: {}", res2);
assert_eq!(res1, 240);
assert_eq!(res2, 848076019766013);
}
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