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//@ run-pass
use std::collections::HashSet;
#[derive(Copy, Clone, PartialEq, Eq, Hash)]
struct XYZ {
x: isize,
y: isize,
z: isize
}
fn main() {
let mut connected = HashSet::new();
let mut border = HashSet::new();
let middle = XYZ{x: 0, y: 0, z: 0};
border.insert(middle);
while !border.is_empty() && connected.len() < 10000 {
let choice = *(border.iter().next().unwrap());
border.remove(&choice);
connected.insert(choice);
let cxp = XYZ{x: choice.x + 1, y: choice.y, z: choice.z};
let cxm = XYZ{x: choice.x - 1, y: choice.y, z: choice.z};
let cyp = XYZ{x: choice.x, y: choice.y + 1, z: choice.z};
let cym = XYZ{x: choice.x, y: choice.y - 1, z: choice.z};
let czp = XYZ{x: choice.x, y: choice.y, z: choice.z + 1};
let czm = XYZ{x: choice.x, y: choice.y, z: choice.z - 1};
if !connected.contains(&cxp) {
border.insert(cxp);
}
if !connected.contains(&cxm){
border.insert(cxm);
}
if !connected.contains(&cyp){
border.insert(cyp);
}
if !connected.contains(&cym) {
border.insert(cym);
}
if !connected.contains(&czp){
border.insert(czp);
}
if !connected.contains(&czm) {
border.insert(czm);
}
}
}
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