struct Solution;
impl Solution {
fn decrypt(code: Vec<i32>, k: i32) -> Vec<i32> {
let n = code.len();
if k == 0 {
return vec![0; n];
}
let mut res = vec![];
for i in 0..n {
let mut sum = 0;
for j in 0..k.abs() {
let index = if k > 0 {
(n as i32 + (i as i32 + 1 + j)) as usize % n
} else {
(n as i32 + (i as i32 - 1 - j)) as usize % n
};
sum += code[index];
}
res.push(sum);
}
res
}
}
#[test]
fn test() {
let code = vec![5, 7, 1, 4];
let k = 3;
let res = vec![12, 10, 16, 13];
assert_eq!(Solution::decrypt(code, k), res);
let code = vec![1, 2, 3, 4];
let k = 0;
let res = vec![0, 0, 0, 0];
assert_eq!(Solution::decrypt(code, k), res);
let code = vec![2, 4, 9, 3];
let k = -2;
let res = vec![12, 5, 6, 13];
assert_eq!(Solution::decrypt(code, k), res);
}