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调试了3个钟，给点留念……这题与矩阵连乘那些有些类似，只不过它多了个环，所以可以把环展开，变成长数组来做，如 把*1*2+3 这个串变成1*2+3*1*2，然后就跟矩阵连乘很类似了。 Followed by:
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