sumkindofproblem

Sum Kind of Problem

ID: sumkindofproblem

Difficulty: 1.5

CPU Time: 1 second

Memory: 1024 MB

Solution

Three formulas can be used for the sum of the first N, positive, odd, and even integers.

• Positive = (N * (N + 1)) / 2
• Odd = N * N
• Even = N * (N + 1)
• Can even just do odd first and add N to it to get even.