When n is an odd square, let m? =n, then the coordinate of the nth point is (m, 0), and the n- 1 th point is (m, 1)? , the n-2nd is (m, 2)? . . . The rule is not satisfied until the n-m time,

20 12=45? - 13,

The coordinate of point 20 12 is (45, 13).

Similarly, when n is an even square, let m? =n, then the coordinates of the nth point are (1, m- 1), and the coordinates of the nth point are (1, m)? , the n+2nd is (2, m)? . . .

Find the coordinates of key points such as point A or point B, and the problem will not be a problem.