Solved by happy_node

#	Title	# Solved	Avg. Tries
15456	Greedy Gift Takers	108	2.06
15742	Slingshot	52	1.90
17194	Balancing Inversions	51	2.41
19619	Swapping Cities	56	2.36
20645	Bovine Genetics	23	1.52
21853	Road Closures	21	3.67
23874	Bracelet Crossings	30	3.00
27552	Tractor Paths	25	1.28
27554	Subtree Activation	23	2.17
27556	Lights Off	41	1.98
27841	Problem Setting	35	1.51
27843	Equal Sum Subarrays	96	2.19
28025	Pareidolia	15	1.47
28028	Custodial Cleanup	18	2.83
28030	Tree Merging	17	1.94

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