Python: Find four positive even integers whose sum is n
Python Programming Puzzles: Exercise-100 with Solution
Write a Python program to find four positive even integers whose sum is a given integer.
Input: n = 100 Output: [94, 2, 2, 2] Input: n = 1000 Output: [994, 2, 2, 2] Input: n = 10000 Output: [9994, 2, 2, 2] Input: n = 1234567890 Output: [1234567884, 2, 2, 2]
Sample Solution:
Python Code:
#License: https://bit.ly/3oLErEI
def test(n):
for a in range(n, 0, -1):
if not a % 2 == 0:
continue
for b in range(n - a, 0, -1):
if not b % 2 == 0:
continue
for c in range(n - b - a, 0, -1):
if not c % 2 == 0:
continue
for d in range(n - b - c - a, 0, -1):
if not d % 2 == 0:
continue
if a + b + c + d == n:
return [a, b, c, d]
n = 100
print("Four positive even integers whose sum is",n)
print(test(n))
n = 1000
print("\nFour positive even integers whose sum is",n)
print(test(n))
n = 10000
print("\nFour positive even integers whose sum is",n)
print(test(n))
n = 1234567890
print("\nFour positive even integers whose sum is",n)
print(test(n))
Sample Output:
Four positive even integers whose sum is 100 [94, 2, 2, 2] Four positive even integers whose sum is 1000 [994, 2, 2, 2] Four positive even integers whose sum is 10000 [9994, 2, 2, 2] Four positive even integers whose sum is 1234567890 [1234567884, 2, 2, 2]
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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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