Solved by happy_node

#	Title	# Solved	Avg. Tries
15456	Greedy Gift Takers	104	2.10
15742	Slingshot	48	1.92
17194	Balancing Inversions	49	2.41
19619	Swapping Cities	51	2.37
20645	Bovine Genetics	21	1.52
21853	Road Closures	16	2.38
23874	Bracelet Crossings	30	3.00
27552	Tractor Paths	23	1.30
27554	Subtree Activation	23	2.17
27556	Lights Off	41	1.98
27841	Problem Setting	30	1.30
27843	Equal Sum Subarrays	89	2.16
28025	Pareidolia	13	1.54
28028	Custodial Cleanup	17	2.94
28030	Tree Merging	15	2.07

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