Strange things with C++17

Revision en2, by never_giveup, 2018-08-03 15:50:45

Hello, I was solving golf from JOI 2017 Open. My solution got WA, then I decided to change C++17 to C++14 and magically I've got AC. Can someone tell me how is that possible code

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  Rev. Lang. By When Δ Comment
en5 English never_giveup 2018-08-03 16:00:29 101
en4 English never_giveup 2018-08-03 15:53:54 44 Tiny change: '017 Open. My solu' -> '017 Open. I tested in polygon with author's solution. My solu'
en3 English never_giveup 2018-08-03 15:52:59 38 Tiny change: '/AQkR2G1b)' -> '/AQkR2G1b) [test](https://pastebin.com/8ziNV7uc)'
en2 English never_giveup 2018-08-03 15:50:45 0 (published)
en1 English never_giveup 2018-08-03 15:50:10 236 Initial revision (saved to drafts)