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一个半圈拼不出来,多个半圈,既可以拼成三角形,也可以拼成多边形

Posted by 20092462 at 2010-06-11 17:11:46 on Problem 2640
把长度排序,前i个的和只要大于等于第i+1个半圈,就能用前i+1个半圈拼成一个i+1边的多边形

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