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http://poj.org/problem?id=3984
http://t.cn/zTInBDX
http://poj.grids.cn/practice/2698/
http://poj.org/problem?id=1077
例题8-5 http://t.cn/zTInBDX
例题 9-1 数字三角形 http://poj.org/problem?id=1163
例题9-2 嵌套矩形 http://acm.nyist.net/JudgeOnline/problem.php?pid=16
例题9-6 最优矩阵链乘 UVa 348 Optimal Array Multiplication Sequence ZOJ 1276 Optimal Array Multiplication Sequence