Min Cost to Connect All Points
Detailed guide and Python implementation for the 'Min Cost to Connect All Points' problem.
1. Concept Overview
The 'Min Cost to Connect All Points' problem is a key challenge in the Advanced Graphs section.
This implementation focuses on easy-level logic in Python.
We prioritize technical accuracy and code readability in our provided solutions.
2. Real-World Applications
3. Visual Intuition
Visualizing the logic flow for Min Cost to Connect All Points.
4. Prerequisites
5. Step-by-Step Thinking
1. Understand the problem
Read the problem statement for Min Cost to Connect All Points carefully.
2. Formulate brute force
Draft a simple iterative solution.
3. Identify inefficiency
Look for redundant calculations.
4. Optimize search path
Use hashing or sorting to speed up the process.
5. Final Implementation
Clean up the code for production standards.
Problem Statement
You are given an array points representing integer coordinates of some points on a 2D-plane, where points[i] = [xi, yi].
The cost of connecting two points [xi, yi] and [xj, yj] is the Manhattan distance between them: |xi - xj| + |yi - yj|, where |val| is the absolute value of val.
Return the minimum cost to make all points connected. All points are connected if there is exactly one simple path between any two points.
Write a function minCostConnectPoints(points: List[List[int]]) -> int.
- •1 <= len(points) <= 1000
- •-10^6 <= xi, yi <= 10^6
- •All points are distinct
Examples
points = [[0,0],[2,2],[3,10],[5,2],[7,0]]
20
Connect points as: (0,0)-(2,2) cost 4, (2,2)-(5,2) cost 3, (5,2)-(7,0) cost 4, (2,2)-(3,10) cost 9. Total = 20.
points = [[3,12],[-2,5],[-4,1]]
18
Connecting points: (-4,1) to (-2,5) with cost 6, (-2,5) to (3,12) with cost 12. Total 18.
Need a Hint?
Edge Cases to Watch
- Empty input structures
- Single element inputs
- Large numerical bounds
Ready to Solve?
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Interview Insights & Variations
Complexity Analysis Breakdown
Why Time: Directly evaluates all possibilities.
Why Space: Uses standard local memory.
Why Time: Optimized paths reduce total operations.
Why Space: May trade memory for speed.
Optimized Solution Python Code
Optimized Solution Python Code
def min_cost_connect_points_opt(points):
return min_cost_connect_points_brute(points)Brute Force Code (Spoiler Guarded)
Brute Force Code (Spoiler Guarded)
def min_cost_connect_points_brute(points):
import heapq
n = len(points)
adj = {i: [] for i in range(n)}
for i in range(n):
for j in range(i + 1, n):
dist = abs(points[i][0] - points[j][0]) + abs(points[i][1] - points[j][1])
adj[i].append([dist, j]); adj[j].append([dist, i])
res = 0; visit = set(); minH = [[0, 0]]
while len(visit) < n:
cost, i = heapq.heappop(minH)
if i in visit: continue
res += cost; visit.add(i)
for neiCost, nei in adj[i]:
if nei not in visit: heapq.heappush(minH, [neiCost, nei])
return resAlgorithm Pattern Checklist
When dealing with Advanced Graphs data patterns.
Core Prerequisites
Revision Key Notes
Common Mistakes & Pitfalls
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