Grasping `all-the-apples-at-once' › 解法样本 _{Sample solutions} › Rust (Group II) [#285]

fn run_length_encode(ins: &str) -> Vec<(char, usize)> {
    let mut out = vec![];
    let mut i = ins.chars();
    if let Some(mut c) = i.next() {
        let mut count = 1;
        for new_c in i {
            if new_c == c {
                count += 1;
            } else {
                out.push((c, count));
                count = 1;
                c = new_c;
            }
        }
        out.push((c, count));
    }
    out}

It is quite like the solution in Go -- but cleaner and with a better handling of edge cases. The author did grasp the nature of the problem: run-length encoding.