Python: Determine which triples sum to zero
Python Programming Puzzles: Exercise-39 with Solution
Write a Python program to determine which triples sum to zero from a given list of lists.
Input: [[1343532, -2920635, 332], [-27, 18, 9], [4, 0, -4], [2, 2, 2], [-20, 16, 4]] Output: [False, True, True, False, True] Input: [[1, 2, -3], [-4, 0, 4], [0, 1, -5], [1, 1, 1], [-2, 4, -1]] Output: [True, True, False, False, False]
Pictorial Presentation:
Sample Solution-1:
Python Code:
#License: https://bit.ly/3oLErEI
def test(nums):
return [sum(t)==0 for t in nums]
nums = [[1343532, -2920635, 332], [-27, 18, 9], [4, 0, -4], [2, 2, 2], [-20, 16, 4]]
print("Original list of lists:",nums)
print("Determine which triples sum to zero:")
print(test(nums))
nums = [[1, 2, -3], [-4, 0, 4], [0, 1, -5], [1, 1, 1], [-2, 4, -1]]
print("\nOriginal list of lists:",nums)
print("Determine which triples sum to zero:")
print(test(nums))
Sample Output:
Original list of lists: [[1343532, -2920635, 332], [-27, 18, 9], [4, 0, -4], [2, 2, 2], [-20, 16, 4]] Determine which triples sum to zero: [False, True, True, False, True] Original list of lists: [[1, 2, -3], [-4, 0, 4], [0, 1, -5], [1, 1, 1], [-2, 4, -1]] Determine which triples sum to zero: [True, True, False, False, False]
Flowchart:
Visualize Python code execution:
The following tool visualize what the computer is doing step-by-step as it executes the said program:
Sample Solution-2:
Python Code:
#License: https://bit.ly/3oLErEI
def test(nums):
zero_sums = []
for trip in nums:
for i in range(len(trip)):
for j in range(i + 1, len(trip)):
for k in range(j + 1, len(trip)):
if trip[i] + trip[j] + trip[k] == 0:
zero_sums.append(True)
break
else:
continue
break
else:
continue
break
else:
zero_sums.append(False)
return zero_sums
nums = [[1343532, -2920635, 332], [-27, 18, 9], [4, 0, -4], [2, 2, 2], [-20, 16, 4]]
print("Original list of lists:",nums)
print("Determine which triples sum to zero:")
print(test(nums))
nums = [[1, 2, -3], [-4, 0, 4], [0, 1, -5], [1, 1, 1], [-2, 4, -1]]
print("\nOriginal list of lists:",nums)
print("Determine which triples sum to zero:")
print(test(nums))
Sample Output:
Original list of lists: [[1343532, -2920635, 332], [-27, 18, 9], [4, 0, -4], [2, 2, 2], [-20, 16, 4]] Determine which triples sum to zero: [False, True, True, False, True] Original list of lists: [[1, 2, -3], [-4, 0, 4], [0, 1, -5], [1, 1, 1], [-2, 4, -1]] Determine which triples sum to zero: [True, True, False, False, False]
Flowchart:
Visualize Python code execution:
The following tool visualize what the computer is doing step-by-step as it executes the said program:
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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