摘要：
Givennpoints on a 2D plane, find the maximum number of points that lie on the same straight line.Analysis: This approach cost time complexity O(n^3). 1. If points less than 2 or all points locate at the same position, just output the points number. 2. Find two points with different coordinates ... 阅读全文
摘要：
Evaluate the value of an arithmetic expression inReverse Polish Notation.Valid operators are+,-,*,/. Each operand may be an integer or another expression.Some examples: ["2", "1", "+", "3", "*"] -> ((2 + 1) * 3) -> 9 ["4", "13&qu 阅读全文