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题目描述 Given a string containing just the characters'(',')','{','}','['and']', determine if the input string is valid. The brackets must close in the co 阅读全文
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题目描述 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 rai 阅读全文
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题目描述 Given a string containing just the characters'('and')', find the length of the longest valid (well-formed) parentheses substring. For"(()", the l 阅读全文
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题目描述 Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the 阅读全文
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题目描述 Evaluate the value of an arithmetic expression inReverse Polish Notation. Valid operators are+,-,*,/. Each operand may be an integer or another e 阅读全文