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DP优化（1）-滚动数组

Posted by 5D6D2 at 2012-06-03 16:06:12 on Problem 1036 
简单DP
F[i,j] = Max{ F[i-1,j-1] , F[i-1,j] , F[i-1,j+1] } + W[i,j]（i时刻，开门程度j）
F[0,0]=0      F[0,i]= -INF
滚动数组，存储两项
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