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Question: https://mirror.codeforces.com/problemset/problem/1906/M
Editorial: https://competition.binus.ac.id/icpc2023/M5xmtK1iPAdXT1t765fbLg5m66d52XuT.pdf
The second part in the editorial where $$$M \le 2 \cdot (S - M)$$$
I read it, but still feel I don't quite get it.
Can someone please help me to understand the math of the second part
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