判断N点中是否存在三个点共线

题目描述 Given points on a 2D plane, judge whether there're three points that locate on the same line. 输入格式 The number of test cases T(1≤T≤10) appears in the first line of input. Each test case begins with the number of points N(1≤N≤100). The following N lines describe the coordinates (xi,yi) of each