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想了半天终于看懂啦，有思路啦！先用位图遍历p,q,r,s,t的值，代入式子。 式子解析应该和前缀表达式一样，一个数字栈一个符号栈从右往左解析 之后穷举表达式的值。 今天先追电视剧去了，明天起来A掉它，上代码！ Followed by:
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