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POJ 1328 Radar Installation 雷达安装 贪心问题求解

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Assume the coasting is an infinite straight line. Land is in one side of coasting, sea in the other. Each small island is a point locating in the sea side. And any radar installation, locating on the coasting, can only cover d distance, so an island in the sea can be covered by a radius installation, if the distance between them is at most d. Assume the coasting is an infinite straight line.

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