38 lines
968 B
Rust
38 lines
968 B
Rust
use std::cmp::min;
|
|
|
|
fn find_type_of_palindrome(s: &String) -> i32 {
|
|
let s_chars = s.chars().collect::<Vec<char>>();
|
|
let mut dex: Vec<(i32, usize, usize)> = Vec::new();
|
|
|
|
dex.push((0, 0, s_chars.len() - 1));
|
|
|
|
let mut last_rm = 4;
|
|
|
|
while !dex.is_empty() {
|
|
let (rm, start, end) = dex.pop().unwrap();
|
|
if rm >= 4 || start >= end {
|
|
last_rm = min(last_rm, rm);
|
|
continue;
|
|
}
|
|
if s_chars[start] == s_chars[end] {
|
|
dex.push((rm, start + 1, end - 1));
|
|
} else {
|
|
dex.push((rm + 1, start + 1, end));
|
|
dex.push((rm + 1, start, end - 1));
|
|
}
|
|
}
|
|
|
|
return if (last_rm <= 3) { last_rm } else { -1 };
|
|
}
|
|
|
|
fn main() {
|
|
let mut s = String::new();
|
|
|
|
match std::io::stdin().read_line(&mut s) {
|
|
Ok(_) => s = s.trim().to_string(),
|
|
Err(_) => return,
|
|
};
|
|
|
|
println!("{}", find_type_of_palindrome(&s));
|
|
}
|