Given n ropes of different lengths, you need to connect these ropes into one rope. You can connect only 2 ropes at a time. The cost required to connect 2 ropes is equal to sum of their lengths. The length of this connected rope is also equal to the sum of their lengths. This process is repeated until n ropes are connected into a single rope. Find the min possible cost required to connect all ropes.

**Input**

ropes, an int arrary representing the rope length.

**Output**

Return the min possible cost required to connect all ropes.

**Examples 1**

Input:

ropes = [8, 4, 6, 12]

Output:

58

Explaination:

Explanation: The optimal way to connect ropes is as follows

1. Connect the ropes of length 4 and 6 (cost is 10). Ropes after connecting: [8, 10, 12]

2. Connect the ropes of length 8 and 10 (cost is 18). Ropes after connecting: [18, 12]

3. Connect the ropes of length 18 and 12 (cost is 30).

Total cost to connect the ropes is 10 + 18 + 30 = 58

**Examples 2**

Input:

ropes = [20, 4, 8, 2]

Output:

54

**Examples 3**

Input:

ropes = [1, 2, 5, 10, 35, 89]

Output:

224

**Examples 4**

Input:

ropes = [2, 2, 3, 3]

Output:

20

###### More Amazon Online Assessment Questions 2021

##### Solve the problem:

Python3#### Get one-to-one training from Google Facebook engineers

##### Top-notch Professionals

Learn from Facebook and Google senior engineers interviewed 100+ candidates.

Most recent interview questions and system design topics gathered from aonecode alumnus.

One-to-one online classes. Get feedbacks from real interviewers.

##### Customized Private Class

Already a coding expert? - Advance straight to hard interview topics of your interest.

New to the ground? - Develop basic coding skills with your own designated mentor.

Days before interview? - Focus on most important problems in target company question bank.