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大胆猜想，这道题 能用对偶性+半平面交解。。。

Posted by tasty at 2014-07-30 00:13:33 on Problem 3985 and last updated at 2014-07-30 00:15:37 
就是求的是整数解 有点蛋疼，继续研究。。。。(至少这是一个思考方向，转化线性规划)
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