Python Basics簡単

Finding Minimum scalar product of two vectors

Detailed guide and Python implementation for the 'Finding Minimum scalar product of two vectors' problem.

問題提起

簡単

Write a function min_scalar_product(v1, v2) that takes two lists of integers of equal length and returns the minimum possible scalar (dot) product. You can rearrange elements in both vectors in any order before computing the dot product. The dot product is sum(v1[i] * v2[i]) for all i. To minimize, pair the largest of one with the smallest of the other.

制約
  • 1 <= len(v1) == len(v2) <= 10^4
  • -10^5 <= v1[i], v2[i] <= 10^5

Example 1
Input
v1 = [1, 3, -5], v2 = [-2, 4, 1]
Output
-25
Explanation

Sort v1 ascending: [-5,1,3]. Sort v2 descending: [4,1,-2]. Dot product: (-5)*4 + 1*1 + 3*(-2) = -20+1-6 = -25.

Example 2
Input
v1 = [1, 2, 3], v2 = [4, 5, 6]
Output
32
Explanation

Sort v1 ascending: [1,2,3]. Sort v2 descending: [6,5,4]. Dot: 1*6+2*5+3*4 = 6+10+12 = 32? Wait: minimum is 1*6+2*5+3*4=32. Alternative: 1*4+2*5+3*6=32. Actually min is 1*6+2*5+3*4=32.

Example 3
Input
v1 = [1, 1], v2 = [1, 1]
Output
2
Explanation

Both vectors are [1,1]. Any arrangement gives 1*1 + 1*1 = 2.

Need a Hint?
Consider using Arrays-specific data structures like sets or heaps.
Edge Cases to Watch
  • Empty input structures
  • Single element inputs
  • Large numerical bounds

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