Solved by tranxuanbach

#	Title	# Solved	Avg. Tries
31218	King of Data Structures	186	1.78
31219	World Tour	110	1.94
31220	Connected Dominating Set	61	2.11
31221	Hard Number Guessing Game	63	3.51
31222	Sequence and Not Difficult Queries	128	1.34
31223	Cactus Folding	29	2.90
31403	$A + B - C$	10,683	1.59

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