[Solved] How to add variable length array into a Vec?

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What have you tried? The straight translation of your example works:

fn main() {
    let mut a = vec![];
    a.push(vec![1, 2]);
    a.push(vec![1, 2, 3]);
    a.push(vec![1, 2, 3, 4]);
    a.push(vec![1, 2, 3]);
    println!("{:?}", a);
}

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solved How to add variable length array into a Vec?