#[cfg(test)]
mod examples {
    use day25::coins_div;

    #[test]
    fn example1() {
        assert!(coins_div(&[1, 2, 3, 2, 2, 2, 3]));
    }

    #[test]
    fn example2() {
        assert!(!coins_div(&[5, 3, 10, 1, 2]));
    }
    #[test]
    fn example3() {
        assert!(coins_div(&[2, 4, 3, 2, 4, 9, 7, 8, 6, 9]));
    }
}