ARST打卡第308周

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impl Solution {
    pub fn add_spaces(s: String, spaces: Vec<i32>) -> String {
        let mut res = String::with_capacity(s.len() + spaces.len());
        let mut i = 0;
        for space in spaces {
            res.push_str(&s[i..space as usize]);
            res.push(' ');
            i = space as usize;
        }
        res.push_str(&s[i..]);
        res
    }
}