Practice Alternating Digit Sum
Read the task, work through the examples, and check your approach against the constraints. Use the original LeetCode task for coding and submissions.
Problem Statement
Read the decimal digits of positive n from left to right. Add the first digit, subtract the second, and continue alternating signs. Return the signed sum.
Source: Alternating Digit Sum on LeetCode. Use the original task for its coding environment and submissions.
Examples
# Example 1
Input
n = 521
Output
4
# Example 2
Input
n = 111
Output
1
# Example 3
Input
n = 886996
Output
0
Constraints
1 <= n <= 10^9
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