Python: Find the three elements that sum to zero from a set of n real numbers

Python Class: Exercise-6 with Solution

Write a Python class to find the three elements that sum to zero from a set (array) of n real numbers.

Sample Solution:

Python Code:

class py_solution:
 def threeSum(self, nums):
        nums, result, i = sorted(nums), [], 0
        while i < len(nums) - 2:
            j, k = i + 1, len(nums) - 1
            while j < k:
                if nums[i] + nums[j] + nums[k] < 0:
                    j += 1
                elif nums[i] + nums[j] + nums[k] > 0:
                    k -= 1
                else:
                    result.append([nums[i], nums[j], nums[k]])
                    j, k = j + 1, k - 1
                    while j < k and nums[j] == nums[j - 1]:
                        j += 1
                    while j < k and nums[k] == nums[k + 1]:
                        k -= 1
            i += 1
            while i < len(nums) - 2 and nums[i] == nums[i - 1]:
                i += 1
        return result

print(py_solution().threeSum([-25, -10, -7, -3, 2, 4, 8, 10]))

Sample Output:

[[-10, 2, 8], [-7, -3, 10]] 

Pictorial Presentation:

Flowchart:

Python Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a Python class to find a pair of elements (indices of the two numbers) from a given array whose sum equals a specific target number.
Next: Write a Python class to implement pow(x, n).