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pub fn base_k_to_decimal(
k: i64,
nums: &[i64],
) -> i64 {
assert!(k.abs() >= 2);
let mut p = 1;
let mut n = 0;
for x in nums {
n += x * p;
p *= k;
}
n
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test() {
let cases = vec![
((2, vec![0, 1, 1]), 6),
((2, vec![0, 1, 0, 1]), 10),
((-2, vec![0, 1, 1, 1, 1]), 10),
];
for ((k, nums), ans) in cases {
assert_eq!(base_k_to_decimal(k, &nums), ans);
}
}
}