CT080
Sum Square Difference
EasyAcceptance: 0.0%
The sum of the squares of the first n natural numbers is 1^2 + 2^2 + ... + n^2. The square of the sum is (1 + 2 + ... + n)^2. Find the difference between the square of the sum and the sum of the squares for the first n natural numbers.
Example 1:
Input: 10
Output: 2640
Example 2:
Input: 100
Output: 25164150
Example 3:
Input: 20
Output: 41230
Constraints:
1 <= n <= 10^4
Tags:
math arithmetic series
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