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478. Efficient Robot Problem  Find Minimum Trips
Problem: There is N number of items that need to be transferred from one place to another by a robot. Each item has a specific weight. The robot can carry maximum weight K in one trip. You need to come up with an algorithm to find out the minimum number of trips that the robot has to make to transfer all N items.
Note: All the items weight is less than equal to K.
Example:
Items = [2, 3, 1, 5, 3, 6, 2, 2] K = 6 Output: [2, 2, 2] [3, 3] [5, 1] [6] Minimum Trips for robot: 4 Items = [2, 3, 1, 5, 3, 6, 2, 2] K = 10 Output: [6, 1, 2] [5, 3, 2] [3, 2] Minimum Trips for Robot: 3
Approach: Sorting.
 Initialize current_weight = 0.
 Sort all the items in ascending order.
 Picking elements from right to left and keep adding the weights to current_weight until current_weight<K.
 Now start picking elements from left to right and adding the weights to current_weight until current_weight<K.
 Once the previous two steps are over, either current_weight = K or current_weight<K. Send the robot with picked items and add one to trips.
 Repeat the above steps until all the items are sent.
 Use visited [] to mark if the item is already sent or not.
 Use a list to track the items sent in each trip.
Output:
[6] [5, 1] [3, 3] [2, 2, 2] Minimum Trips for Robot: 4