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设栈S和队列Q的初始状态均为空,元素啊,a,b,c,d,e,f,g依次进入栈S。若每个元素出栈后立即进入推列Q,且7个元素出队的顺序是b,d,,c,f,e,a,g,则栈S的容量至少是?
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设栈S初始状态为空。元素a,b,c,d,e,f依次通过栈S,若出栈的顺序为c,f,e,d,b,a,则栈S的容量至少应该为?
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Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.
For example,
Given[0,1,0,2,1,0,1,3,2,1,2,1], return6.
The above elevation map is represented by array [0,1,0,2,1,0,1,3,2,1,2,1]. In this case, 6 units of rain water (blue section) are being trapped. Thanks Marcos for contributing this image! ...
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