[bzoj4364] [IOI2014]wall磚牆
阿新 • • 發佈：2019-01-06
Description
健佳正在用大小相同的磚塊來砌起一面牆。這面牆由 列磚塊所組成，它們從左到右的編號0至n-1。各列的高度可
以不同。各列的高度就是該列磚塊的數量。健佳用如下方式來建造這面牆。最開始每列都沒有磚塊。此後，健佳通
過k個階段的增加(adding)或移除(removing)磚塊操作來砌牆。當所有k個階段完成後，這面牆就砌好了。在每個階
段中，健佳都會被告知一個連續的磚塊列的範圍，以及一個高度值h，然後他就完成如下過程：在增加磚塊(adding
)階段，對於給定的列範圍中高度小於h的列，健佳會增加磚塊使它們的高度都恰好等於h。此時他不會改變那些高
度大於或等於h的列。在移除磚塊(removing)階段，對於給定的列範圍中高度大於 的列，健佳會移除磚塊使它們的
高度都恰好等於h。此時他不會改變那些高度小於或等於h的列。你的任務就是計算出這面牆的最後形狀。
Input
第1行：n, k。
第2+i 行(0≤i≤k-1)：op[i], left[i], right[i], height[i]。
n: 這面牆中的列數。
k: 階段數。
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