XGG Blog

• CF527A Playing with Paper
• CF527B Error Correct System
• CF527C Glass Carving
• CF527D Clique Problem
• CF527E Data Center Drama

CF527A Playing with Paper

Divide.

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CF527B Error Correct System

Greedy.

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CF527C Glass Carving

O(nlogn)$O(n log n)$: use stl set and upper_bound.
O(n)$O(n)$: solve the problem from the last query to the first.

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CF527D Clique Problem

Find the maximum set of intervals which are not intersect with each other. Sort the intervals by their right position and choose them greedily.

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CF527E Data Center Drama

Eulerian Cycle.

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