增加了三道动态规划的题目#16

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zhenv5 wants to merge 4 commits intosoulmachine:masterfrom

Commits on Oct 14, 2014

dynamic programming example
Jiankai
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Commits on Oct 15, 2014

dynamic programming example
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Commits on Oct 23, 2014

activity selection problem
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Commits on Nov 19, 2014

minimum operation transform between strings
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