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Python: List of integers where the sum of the first i integers is i

Python Programming Puzzles: Exercise-7 with Solution

Write a Python program to check a given list of integers where the sum of the first i integers is i.

Input:
[0, 1, 2, 3, 4, 5]
Output:
False

Input:
[1, 1, 1, 1, 1, 1]
Output:
True

Input:
[2, 2, 2, 2, 2]
Output:
False

Pictorial Presentation:

Python: List of integers where the sum of the first i integers is i.
Python: List of integers where the sum of the first i integers is i.

Sample Solution:

Python Code:

#License: https://bit.ly/3oLErEI
 
def test(nums):
    return all([sum(nums[:i]) == i for i in range(len(nums))])
nums = [0,1,2,3,4,5]
print("Original list:")
print(nums)
print("Check the said list, where the sum of the first i integers is i:")
print(test(nums))
nums = [1,1,1,1,1,1]
print("\nOriginal list:")
print(nums)
print("Check the said list, where the sum of the first i integers is i:")
print(test(nums))
nums = [2,2,2,2,2]
print("\nOriginal list:")
print(nums)
print("Check the said list, where the sum of the first i integers is i:")
print(test(nums))

Sample Output:

Original list:
[0, 1, 2, 3, 4, 5]
Check the said list, where the sum of the first i integers is i:
False

Original list:
[1, 1, 1, 1, 1, 1]
Check the said list, where the sum of the first i integers is i:
True

Original list:
[2, 2, 2, 2, 2]
Check the said list, where the sum of the first i integers is i:
False

Flowchart:

Flowchart: Python - List of integers where the sum of the first i integers is i.

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

Clamps num within the inclusive range specified by the boundary values x and y:

Example:

def tips_clamp_num(num,x,y):
  return max(min(num, max(x, y)), min(x, y))
print(tips_clamp_num(2, 4, 6))
print(tips_clamp_num(1, -1, -6))

Output:

4
-1