MathDB
2016 Team #13

Source:

August 17, 2022
2016team test

Problem Statement

Ash writes the positive integers from 11 to 20162016 inclusive as a single positive integer n=1234567891011…2016n=1234567891011\dots2016. What is the result obtained by successively adding and subtracting the digits of nn? (In other words, compute 1−2+3−4+5−6+7−8+9−1+0−1+…1-2+3-4+5-6+7-8+9-1+0-1+\dots.)
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