Return the sum of all integers in `nums`. Variant **#21** focuses on clean iteration without built-in shortcuts.
Example 1
Input: nums = [21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45]
Output: 825
Constraints
Acceptance: 66% · Topics: array, math