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Re:请教如何用差分约束来做In Reply To:请教如何用差分约束来做 Posted by:gffly at 2007-03-09 15:35:46 设S(i)为 1..i 中在最终序列中的的整数个数。
S(b) - S(a) >= c
0 <= S(i) - S(i-1) <= 1
--->
S(i) - S(i-1) >= 0
S(i-1) - S(i) >= -1
得到了约束条件。bellman-ford搞掉。
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