https://blog.gongquiz.com/2022/04/30/x-y-%ed%8f%89%eb%a9%b4-%ec%a2%8c%ed%91%9c%ea%b3%84%ec%97%90%ec%84%9c-%eb%91%90-%ec%a0%90-p1x1-y1-p2x2-y2%eb%a5%bc-%ec%95%8c%ea%b3%a0-%ec%9e%88%ec%9d%84-%ea%b8%b0%ea%b3%84%ec%84%a4/