B'You are given the set of vectors on the plane, each of them starting at the origin. Your task is to find a pair of vectors with the minimal non-oriented angle between them. Non-oriented angle is non-negative value, minimal between clockwise and counterclockwise direction angles. Non-oriented angle is always between 0 and xcf x80. For example, opposite directions vectors have angle equals to xcf x80. First line of the input contains a single integer n (2 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89n xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89100 xe2 x80 x89000) -- the number of vectors. The i-th of the following n lines contains two integers xi and yi (|x|, xe2 x80 x89|y| xe2 x80 x89 xe2 x89 xa4 xe2 x80 x8910 xe2 x80 x89000, xe2 x80 x89x2 xe2 x80 x89+ xe2 x80 x89y2 xe2 x80 x89> xe2 x80 x890) -- the coordinates of the i-th vector. Vectors are numbered from 1 to n in order of appearing in the input. It is guaranteed that no two vectors in the input share the same direction (but they still can have opposite directions). Print two integer numbers a and b (a xe2 x80 x89 xe2 x89 xa0 xe2 x80 x89b) -- a pair of indices of vectors with the minimal non-oriented angle. You can print the numbers in any order. If there are many possible answers, print any.'...