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JUST Enum

Posted by 2008022118 at 2009-12-20 10:18:26 on Problem 2142
There are three kinds of situation.
xA+yB=D;
|xA-yB|=D; -> xA-yB and yB-xA

we can enum x.
while x>min_(x+y) or xA>min_(xA+yB) break;

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