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#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_mut)]
use std::env;
use std::fs::File;
use std::io::Read;
#[derive(Debug)]
struct Stone {
x: Vec<f64>,
v: Vec<f64>,
}
fn ints(s: &str) -> Vec<f64> {
s.to_string()
.split(|c: char| !c.is_numeric() && c != '-')
.filter_map(|x| x.parse().ok())
.collect()
}
fn crosses_xy(s1: &Stone, s2: &Stone, coord_min: f64, coord_max: f64) -> bool {
// y = y0 + yv * (x - x0) / xv
let n1: f64 = s1.x[1] - s1.x[0] * s1.v[1] / s1.v[0];
let k1: f64 = s1.v[1] / s1.v[0];
let n2: f64 = s2.x[1] - s2.x[0] * s2.v[1] / s2.v[0];
let k2: f64 = s2.v[1] / s2.v[0];
if k1 == k2 {
return false;
}
let x = (n2 - n1) / (k1 - k2);
let y = x * k1 + n1;
let t1 = (x - s1.x[0]) / s1.v[0];
let t2 = (x - s2.x[0]) / s2.v[0];
if (coord_min <= x)
&& (x <= coord_max)
&& (coord_min <= y)
&& (y <= coord_max)
&& (t1 >= 0.)
&& (t2 >= 0.)
{
return true;
}
false
}
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 ss: Vec<Stone> = Vec::new();
for line in lines {
let (x, v) = line.split_once("@").unwrap();
ss.push(Stone {
x: ints(x),
v: ints(v),
});
}
let coord_min = 200000000000000.0;
let coord_max = 400000000000000.0;
// let coord_min = 7.0;
// let coord_max = 27.0;
let mut cross: Vec<bool> = Vec::new();
for i in 0..ss.len() {
for j in i..ss.len() {
cross.push(crosses_xy(&ss[i], &ss[j], coord_min, coord_max));
}
}
let res1 = cross.iter().filter(|x| **x).fold(0, |x, _| x + 1);
let mut res2 = 0;
println!("res1: {}", res1);
println!("res2: {}", res2);
}
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