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该博客介绍了Fred Mapper面临的土地购买挑战，由于密西西比河造成的侵蚀，路易斯安那州每年缩小50平方英里。Fred发现失去的土地形成一个半圆形，以(0,0)为中心，X轴为中线。文章讨论了如何根据给定的坐标预测土地何时会受到侵蚀，并提供了输入输出示例。"
123186657,12343910,JavaScript链表题目解析与实战,"['javascript', '数据结构', '链表']
Description
Fred Mapper is considering purchasing some land in Louisiana to build his house on. In the process of investigating the land, he learned that the state of Louisiana is actually shrinking by 50 square miles each year, due to erosion caused by the Mississippi River. Since Fred is hoping to live in this house the rest of his life, he needs to know if his land is going to be lost to erosion.
After doing more research, Fred has learned that the land that is being lost forms a semicircle. This semicircle is part of a circle centered at (0,0), with the line that bisects the circle being the X axis. Locations below the X axis are in the water. The semicircle has an area of 0 at the beginning of year 1. (Semicircle illustrated in the Figure.)
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