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use std::io::{self, Write};
use std::iter;
fn make_passwords<W: Write>(patterns: &[Vec<u8>],
buffer: &mut Vec<u8>,
i: usize,
writer: &mut W) {
if i == patterns.len() {
writer.write(&buffer).unwrap();
} else {
for c in patterns[i].iter() {
buffer[i] = *c;
make_passwords(patterns, buffer, i+1, writer);
}
}
}
fn main() {
let range = |a, b| {
(a as u8 .. b as u8 + 1).collect::<Vec<_>>()
};
let patterns: Vec<Vec<u8>> = vec!(
range('a', 'z'),
range('1', '9'),
range('a', 'z'),
range('a', 'z'),
range('a', 'z'),
);
let mut buffer: Vec<u8> = vec!(0; patterns.len() + 1);
buffer[patterns.len()] = '\n' as u8;
let mut writer = io::BufWriter::new(io::stdout());
make_passwords(&patterns, &mut buffer, 0, &mut writer);
}
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