blob: 798df9741454d95a00aa6acc7b40bf0cf269951e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_mut)]
use std::env;
use std::fs::File;
use std::io::Read;
use itertools::Itertools;
fn is_safe(arr: &[i32]) -> bool {
let diff: Vec<i32> = arr.windows(2).map(|w| w[0] - w[1]).collect();
let inc_ok = diff
.iter()
.map(|a| (3 >= a.abs()) && (a.abs() >= 1))
.all(|a| a);
let sign_ok = diff.iter().map(|a| *a > 0).all_equal();
inc_ok && sign_ok
}
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 res1 = 0;
let mut res2 = 0;
for line in lines {
let a: Vec<i32> = line.split(" ").map(|a| a.parse().unwrap()).collect();
if is_safe(&a) {
res1 += 1;
res2 += 1;
} else {
for i in 0..a.len() {
let mut b = a.clone();
b.remove(i);
if is_safe(&b) {
res2 += 1;
break;
}
}
}
}
println!("res1: {}", res1);
println!("res2: {}", res2);
assert_eq!(res1, 257);
assert_eq!(res2, 328);
}
|
