fn main() {
    println!("Hello, world!");
}

struct Solution;

impl Solution {
    pub fn min_operations(s: String) -> i32 {
        let a: Vec<_> = s.chars().collect();
        i32::min(
            a.chunks(2).map(|x| match x { ['0','1'] | ['0'] => 0, ['1', '0'] => 2, _ => 1 }).sum(),
            a.chunks(2).map(|x| match x { ['1','0'] | ['1'] => 0, ['0', '1'] => 2, _ => 1 }).sum()
            )
    }
}