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#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_mut)]
use std::env;
use std::fs::File;
use std::io::Read;
fn rec(val: i64, acc: i64, mut eq: Vec<i64>) -> bool {
if eq.len() == 0 {
if val == acc {
return true;
} else {
return false;
}
}
let a = eq.pop().unwrap();
return rec(val, acc * a, eq.clone()) || rec(val, acc + a, eq.clone());
}
fn rec2(val: i64, acc: i64, mut eq: Vec<i64>) -> bool {
if eq.len() == 0 {
if val == acc {
return true;
} else {
return false;
}
}
let a = eq.pop().unwrap();
return rec2(val, a + acc * 10_i64.pow(a.checked_ilog10().unwrap() + 1), eq.clone())
|| rec2(val, acc * a, eq.clone())
|| rec2(val, acc + a, eq.clone());
}
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 lines = content.trim_end().split("\n");
let mut vals: Vec<i64> = Vec::new();
let mut eqs: Vec<Vec<i64>> = Vec::new();
for line in lines {
let (c, rest) = line.split_once(": ").unwrap();
vals.push(c.parse().unwrap());
eqs.push(
rest.split(" ")
.map(|a| a.parse().unwrap())
.collect::<Vec<i64>>()
.into_iter()
.rev()
.collect(),
);
}
let mut res1 = 0;
let mut res2 = 0;
for i in 0..eqs.len() {
if rec(vals[i], 0, eqs[i].clone()) {
res1 += vals[i];
}
if rec2(vals[i], 0, eqs[i].clone()) {
res2 += vals[i];
}
}
println!("res1: {}", res1);
println!("res2: {}", res2);
assert_eq!(res1, 66343330034722);
assert_eq!(res2, 637696070419031);
}
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