Python: Find k number of pairs which consists of one element from the first array and one element from the second array
Python heap queue algorithm: Exercise-17 with Solution
You are given two integer arrays sorted in ascending order and an integer k. Write a Python program to find k number of pairs (u, v) which consists of one element from the first array and one element from the second array using Heap queue algorithm.
Sample Solution:
Python Code:
import heapq
def k_Smallest_Pairs(nums1, nums2, k):
queue = []
def push(i, j):
if i < len(nums1) and j < len(nums2):
heapq.heappush(queue, [nums1[i] + nums2[j], i, j])
push(0, 0)
pairs = []
while queue and len(pairs) < k:
_, i, j = heapq.heappop(queue)
pairs.append([nums1[i], nums2[j]])
push(i, j + 1)
if j == 0:
push(i + 1, 0)
return pairs
nums1 = [1,3,7]
nums2 = [2,4,6]
k = 2
result = k_Smallest_Pairs(nums1, nums2, k)
print(result)
Sample Output:
[[1, 2], [1, 4]]
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Previous: Write a Python program which add integer numbers from the data stream to a heapq and compute the median of all elements.
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Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
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import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
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