#2544
Alternating Digit Sum
newbie · 295 · lc easy +20 · verified · 69% accepted · 479 likes · top 76%
Description
Given a positive integer n, assign signs to its digits so that the most significant digit is positive and each subsequent digit alternates sign. Return the resulting signed digit sum.
Example 1:
Input: n = 521
Output: 4
Explanation: (+5) + (-2) + (+1) = 4.
Example 2:
Input: n = 111
Output: 1
Explanation: (+1) + (-1) + (+1) = 1.
Example 3:
Input: n = 886996
Output: 0
Explanation: (+8) + (-8) + (+6) + (-9) + (+9) + (-6) = 0.
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