CF1179C Serge and Dining Room

Serge came to the school dining room and discovered that there is a big queue here. There are $ m $ pupils in the queue. He's not sure now if he wants to wait until the queue will clear, so he wants to know which dish he will receive if he does. As Serge is very tired, he asks you to compute it instead of him. Initially there are $ n $ dishes with costs $ a_1, a_2, \ldots, a_n $ . As you already know, there are the queue of $ m $ pupils who have $ b_1, \ldots, b_m $ togrogs respectively (pupils are enumerated by queue order, i.e the first pupil in the queue has $ b_1 $ togrogs and the last one has $ b_m $ togrogs) Pupils think that the most expensive dish is the most delicious one, so every pupil just buys the most expensive dish for which he has money (every dish has a single copy, so when a pupil has bought it nobody can buy it later), and if a pupil doesn't have money for any dish, he just leaves the queue (so brutal capitalism...) But money isn't a problem at all for Serge, so Serge is buying the most expensive dish if there is at least one remaining. Moreover, Serge's school has a very unstable economic situation and the costs of some dishes or number of togrogs of some pupils can change. More formally, you must process $ q $ queries: - change $ a_i $ to $ x $ . It means that the price of the $ i $ -th dish becomes $ x $ togrogs. - change $ b_i $ to $ x $ . It means that the $ i $ -th pupil in the queue has $ x $ togrogs now. Nobody leaves the queue during those queries because a saleswoman is late. After every query, you must tell Serge price of the dish which he will buy if he has waited until the queue is clear, or $ -1 $ if there are no dishes at this point, according to rules described above.

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In the first sample after the first query, there is one dish with price $ 100 $ togrogs and one pupil with one togrog, so Serge will buy the dish with price $ 100 $ togrogs. In the second sample after the first query, there is one dish with price one togrog and one pupil with $ 100 $ togrogs, so Serge will get nothing. In the third sample after the first query, nobody can buy the dish with price $ 8 $ , so Serge will take it. After the second query, all dishes will be bought, after the third one the third and fifth pupils will by the first and the second dishes respectively and nobody will by the fourth one.