1652. Defuse the Bomb

https://leetcode.com/problems/defuse-the-bomb

Description

You have a bomb to defuse, and your time is running out! Your informer will provide you with a circular array code of length of n and a key k.

To decrypt the code, you must replace every number. All the numbers are replaced simultaneously.

• If k > 0, replace the ith number with the sum of the next k numbers.

• If k < 0, replace the ith number with the sum of the previous k numbers.

• If k == 0, replace the ith number with 0.

As code is circular, the next element of code[n-1] is code[0], and the previous element of code[0] is code[n-1].

Given the circular array code and an integer key k, return the decrypted code to defuse the bomb!

Example 1:

**Input:** code = [5,7,1,4], k = 3
**Output:** [12,10,16,13]
**Explanation:** Each number is replaced by the sum of the next 3 numbers. The decrypted code is [7+1+4, 1+4+5, 4+5+7, 5+7+1]. Notice that the numbers wrap around.

Example 2:

**Input:** code = [1,2,3,4], k = 0
**Output:** [0,0,0,0]
**Explanation:** When k is zero, the numbers are replaced by 0. 

Example 3:

**Input:** code = [2,4,9,3], k = -2
**Output:** [12,5,6,13]
**Explanation:** The decrypted code is [3+9, 2+3, 4+2, 9+4]. Notice that the numbers wrap around again. If k is negative, the sum is of the **previous** numbers.

Constraints:

• n == code.length

• 1 <= n <= 100

• 1 <= code[i] <= 100

• -(n - 1) <= k <= n - 1

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