http://cpp.sh/9uog3
https://pastebin.com/AUb5jsYc
http://cpp.sh/43oov
https://paiza.io/projects/hb1F6ojWsuw1IljFRo6F0w?language=php
https://ide.geeksforgeeks.org/37dac66d-23b6-4755-80ff-b73580ed630e
https://ideone.com/jtSHUJ
https://paste.tbee-clan.de/KvLmH