Python: Find the top k integers that occur the most frequently from a given lists of sorted and distinct integers using Heap queue algorithm
Python heap queue algorithm: Exercise-9 with Solution
Write a Python program to find the top k integers that occur the most frequently from a given lists of sorted and distinct integers using Heap queue algorithm.
Sample Solution:
Python Code:
def func(nums, k):
import collections
d = collections.defaultdict(int)
for row in nums:
for i in row:
d[i] += 1
temp = []
import heapq
for key, v in d.items():
if len(temp) < k:
temp.append((v, key))
if len(temp) == k:
heapq.heapify(temp)
else:
if v > temp[0][0]:
heapq.heappop(temp)
heapq.heappush(temp, (v, key))
result = []
while temp:
v, key = heapq.heappop(temp)
result.append(key)
return result
nums = [
[1, 2, 6],
[1, 3, 4, 5, 7, 8],
[1, 3, 5, 6, 8, 9],
[2, 5, 7, 11],
[1, 4, 7, 8, 12]
]
k = 3
print("Original lists:")
print(nums)
print("\nTop 3 integers that occur the most frequently in the said lists:")
print(func(nums, k))
Sample Output:
Original lists: [[1, 2, 6], [1, 3, 4, 5, 7, 8], [1, 3, 5, 6, 8, 9], [2, 5, 7, 11], [1, 4, 7, 8, 12]] Top 3 integers that occur the most frequently in the said lists: [5, 7, 1]
Flowchart:
Python Code Editor:
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Python: Tips of the Day
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__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
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")
Ref: https://bit.ly/3fy0R6m
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