Please help explain the loop invariant for the code above.
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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class Solution:
def minCostConnectPoints(self, points: List[List[int]]) -> int:
# start a visited set and min heap
vis = set()
min_heap = [(0,points[0])]
res = 0
while min_heap:
for _ in range(len(min_heap)):
# check if point at top of heap is not already visited
while tuple(min_heap[0][1]) in vis:
heapq.heappop(min_heap)
dist, point = heapq.heappop(min_heap)
# add distance to the result and add that point to the visited set
res += dist
vis.add(tuple(point))
# we'll stop when the len of visited set becomes equal to length of all points
if len(vis) == len(points):
return res
for i in range(len(points)):
if points[i] == point or tuple(points[i]) in vis:
continue
# add distance of points in the heap along with the point
heapq.heappush(min_heap, (abs(points[i][0] - point[0]) + abs(points[i][1] - point[1]), points[i]))
Please help explain the loop invariant for the code above.
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