ACM-ICPC 2018 徐州賽區網絡預賽 G. Trace【樹狀數組維護區間最大值】

任意門：https://nanti.jisuanke.com/t/31459 There's a beach in the first quadrant. And from time to time, there are sea waves. A wave ( xx , yy ) means the wave is a rectangle whose vertexes are ( 00 , 00 

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