src/main/java/com/fishercoder/solutions/_1652.java

package com.fishercoder.solutions;

public class _1652 {
    public static class Solution1 {
        public int[] decrypt(int[] code, int k) {
            int[] result = new int[code.length];
            int len = code.length;
            if (k == 0) {
                for (int i = 0; i < code.length; i++) {
                    result[i] = 0;
                }
            } else if (k > 0) {
                int kSum = 0;
                for (int i = 1; i <= k; i++) {
                    kSum += code[i];
                }
                result[0] = kSum;
                for (int i = 1; i < len; i++) {
                    kSum -= code[i];
                    kSum += code[(i + k) % len];
                    result[i] = kSum;
                }
            } else {
                int kSum = 0;
                int kVal = Math.abs(k);
                for (int i = len - 1; i >= len - kVal; i--) {
                    kSum += code[i];
                }
                result[0] = kSum;
                for (int i = 1; i < len; i++) {
                    kSum -= code[(len - kVal + i - 1) % len];
                    kSum += code[i - 1];
                    result[i] = kSum;
                }
            }
            return result;
        }
    }
}