ARST打卡第302周

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impl Solution {
    pub fn replace_elements(arr: Vec<i32>) -> Vec<i32> {
        let mut max = -1;
        let mut ans = vec![-1; arr.len()];
        for i in (0..arr.len()).rev() {
            ans[i] = max;
            max = max.max(arr[i]);
        }
        ans
    }
}