Please solve the programming task below using a self-contained code snippet in a markdown code block.

There are k workers who want to move n boxes from the right (old) warehouse to the left (new) warehouse. You are given the two integers n and k, and a 2D integer array time of size k x 4 where time[i] = [righti, picki, lefti, puti].
The warehouses are separated by a river and connected by a bridge. Initially, all k workers are waiting on the left side of the bridge. To move the boxes, the ith worker can do the following:

Cross the bridge to the right side in righti minutes.
Pick a box from the right warehouse in picki minutes.
Cross the bridge to the left side in lefti minutes.
Put the box into the left warehouse in puti minutes.

The ith worker is less efficient than the jth worker if either condition is met:

lefti + righti > leftj + rightj
lefti + righti == leftj + rightj and i > j

The following rules regulate the movement of the workers through the bridge:

Only one worker can use the bridge at a time.
When the bridge is unused prioritize the least efficient worker on the right side to cross. If there are no workers on the right side, prioritize the least efficient worker on the left side to cross.
If enough workers have already been dispatched from the left side to pick up all the remaining boxes, no more workers will be sent from the left side.

Return the elapsed minutes at which the last box reaches the left side of the bridge.
 
Please complete the following python code precisely:
```python
class Solution:
    def findCrossingTime(self, n: int, k: int, time: List[List[int]]) -> int:
```