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use std::io::BufReader;
use std::io::prelude::*;
use std::fs::File;
fn main() {
let lines = read_file();
let mut ssl_count = 0;
for line in lines {
let mut in_squares = false;
let mut char_buffer = [' '; 3];
let mut abas = Vec::new();
let mut babs = Vec::new();
let mut chars = line.chars();
char_buffer[0] = chars.next().unwrap();
char_buffer[1] = chars.next().unwrap();
char_buffer[2] = chars.next().unwrap();
if is_aba(char_buffer) {
if in_squares {
babs.push(char_buffer);
} else {
abas.push(char_buffer);
}
}
for c in chars {
match c {
'[' => {in_squares = true;},
']' => {in_squares = false;},
_ => {}
}
char_buffer[0] = char_buffer[1];
char_buffer[1] = char_buffer[2];
char_buffer[2] = c;
if is_aba(char_buffer) {
if in_squares {
babs.push(char_buffer);
} else {
abas.push(char_buffer);
}
}
}
//println!("ABA {:?}", abas);
//println!("BAB {:?}", babs);
let mut is_ssl = false;
for aba in &abas {
for bab in &babs {
is_ssl = is_ssl || correspond(aba.clone(), bab.clone());
}
}
//println!("Is SSL? {}", is_ssl);
if is_ssl {
ssl_count += 1;
}
}
println!("SSL_count: {}", ssl_count);
}
fn read_file() -> Vec<String> {
let file = BufReader::new(File::open("input.txt").unwrap());
file.lines()
.map(|line| line.unwrap().trim().to_string())
.filter(|line| line.len() > 0)
.collect()
}
fn is_abba(char_buffer: [char; 4]) -> bool {
char_buffer[0] != char_buffer[1] &&
char_buffer[0] == char_buffer[3] &&
char_buffer[1] == char_buffer[2] &&
char_buffer[0] != ']' &&
char_buffer[1] != ']' &&
char_buffer[0] != '[' &&
char_buffer[1] != '['
}
fn is_aba(char_buffer: [char; 3]) -> bool {
char_buffer[0] != char_buffer[1] &&
char_buffer[0] == char_buffer[2] &&
char_buffer[0] != ']' &&
char_buffer[1] != ']' &&
char_buffer[0] != '[' &&
char_buffer[1] != '['
}
fn correspond(aba: [char; 3], bab: [char; 3]) -> bool {
//assumes both follow the aba pattern, so [0] == [2]
aba[0] == bab[1] && aba[1] == bab[0]
}
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