Python: Check whether the sum of any two numbers from the list is equal to k or not

Last update on April 17 2025 13:01:22 (UTC/GMT +8 hours)

Pair Sum to Target

Given a list of numbers and a number k, write a Python program to check whether the sum of any two numbers from the list is equal to k or not.
For example, given [1, 5, 11, 5] and k = 16, return true since 11 + 5 is 16.

Sample Solution:

Python Code:

# Function to check if there exists a pair in the list whose sum is equal to the given value 'k'
def check_sum(nums, k):   
    # Loop through each element in the list
    for i in range(len(nums)):
        # Nested loop to compare each element with subsequent elements
        for j in range(i+1, len(nums)):
            # Check if the sum of the current pair is equal to 'k'
            if nums[i] + nums[j] == k:
                return True  # Return True if such a pair is found
    return False  # Return False if no such pair is found

# Test cases
print(check_sum([12, 5, 0, 5], 10))
print(check_sum([20, 20, 4, 5], 40))
print(check_sum([1, -1], 0))
print(check_sum([1, 1, 0], 0))

Sample Output:

True
True
True
False

Explanation:

Here is a breakdown of the above Python code:

Define a function named "check_sum()" that takes a list of numbers (nums) and a target sum (k) as input.
Use a nested loop to iterate through each pair of elements in the list.
Check if the sum of the current pair is equal to the target sum (k).
If such a pair is found, return 'True'.
If no such pair is found after checking all pairs, return 'False'.
Test the function with different inputs to check its functionality.

Visual Presentation:

Python: Check whether the sum of any two numbers from the list is equal to k or not

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to determine if any two numbers in a list add up to a given target using a hash set.
Write a Python program to check for the existence of a pair that sums to k using the two-pointer technique on a sorted list.
Write a Python program to return all unique pairs from a list whose sum equals a target value.
Write a Python program to verify if any two numbers in an unsorted array can be paired to produce a given sum without nested loops.

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Python Code Editor:

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