27 lines
599 B
Rust
27 lines
599 B
Rust
|
use std::env;
|
||
|
|
use std::fs::File;
|
||
|
|
use std::io::{BufReader, Read};
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
let file = File::open(&env::args().nth(1).unwrap()).unwrap();
|
||
|
|
let reader = BufReader::new(file);
|
||
|
|
|
||
|
|
let (mut x1, mut x2, mut x3) = (0, 0, 0);
|
||
|
|
let mut i = 0;
|
||
|
|
for byte in reader.bytes() {
|
||
|
|
i += 1;
|
||
|
|
let c = byte.unwrap();
|
||
|
|
if c != x1 && c != x2 && c != x3
|
||
|
|
&& x1 != x2 && x1 != x3 && x2 != x3
|
||
|
|
&& x1 != 0 {
|
||
|
|
println!("{}", i);
|
||
|
|
break;
|
||
|
|
} else {
|
||
|
|
x1 = x2;
|
||
|
|
x2 = x3;
|
||
|
|
x3 = c;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|