Please write a program that judges if he can collect all the treasures and can be back to the island where he land on by properly selecting an order of his visit.
He analyzed even the dust in the cleaner used for manufacturing equipment as well as the waste cloth and surprisingly recovered precious metals even from them.
Each of our farms collects manure to produce organic fertilizer and otherwise engages in agricultural recycling while undertaking ideal environmental measures.
Aleph also produces methane gas from draff at its beer factories to generate electricity, and collects used cooking oil from households to produce biodiesel.
Oxidation and ionization will occur at the same time, in equilibrium, recovering electricity that was ionized, making it non-ionic, in other words changing it to a state that is not tinged with electricity.
For each dataset, output YES if it is possible to collect all the treasure chests and return to the entrance room, and otherwise, output NO in a single line.
Gong JunHao(1999),' U.S.A. abolishes the tire and recycles the scheme- the tire and derives fuel', industrial prevention and control of pollution season The publication, the 69th issue.
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