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基本上就是LCS的变形 不过注意处理边界啊（discuss里面说了很多了）我就忘掉处理边界了 样例都过不了
f（0,0）是空集
可是f(0,i)可不是空集 是f(0,i-1)+sum(' ',s1[i])算出来的……
f(i,0)同理
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