P3567 [POI 2014] KUR-Couriers

Byteasar works for the BAJ company, which sells computer games. The BAJ company cooperates with many courier companies that deliver the games sold by the BAJ company to its customers. Byteasar is inspecting the cooperation of the BAJ company with the couriers. He has a log of successive packages with the courier company that made the delivery specified for each package. He wants to make sure that no courier company had an unfair advantage over the others. If a given courier company delivered more than half of all packages sent in some period of time, we say that it dominated in that period. Byteasar wants to find out which courier companies dominated in certain periods of time, if any. Help Byteasar out! Write a program that determines a dominating courier company or that there was none. 给一个数列，每次询问一个区间内有没有一个数出现次数超过一半

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