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最短路的性质

Posted by ip96cns at 2011-03-27 16:46:10 on Problem 1201
In Reply To:为什么用差分可以保证得到的答案是最优的呢？ Posted by:wowfky at 2009-05-15 11:01:34 
如果有解,保证  d[v]<=d[u]+w(u,v) ...这个不等式得到  d[v]-d[u]<= w(u,v)
所以成立d[v],d[u] 就正好是差分约束系统中的两个解
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