{"trustable":false,"prependHtml":"\u003cscript\u003e window.katexOptions \u003d { disable: true }; \u003c/script\u003e\n\u003cscript type\u003d\"text/x-mathjax-config\"\u003e\n MathJax.Hub.Config({\n tex2jax: {\n inlineMath: [[\u0027$$$\u0027,\u0027$$$\u0027], [\u0027$\u0027,\u0027$\u0027]],\n displayMath: [[\u0027$$$$$$\u0027,\u0027$$$$$$\u0027], [\u0027$$\u0027,\u0027$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\" type\u003d\"text/javascript\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cscript type\u003d\u0027text/x-mathjax-config\u0027\u003eMathJax.Hub.Config({tex2jax: { inlineMath: [[\u0027$\u0027,\u0027$\u0027]] } }); \u003c/script\u003e\n\u003cscript type\u003d\u0027text/javascript\u0027 src\u003d\u0027https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\u0027\u003e\u003c/script\u003e\n\u003cscript type\u003d\u0027text/javascript\u0027\u003esetTimeout(function(){MathJax.Hub.Queue([\u0027Typeset\u0027, MathJax.Hub, \u0027left_view\u0027]);}, 2000);\u003c/script\u003e\n\u003cdiv class\u003d\"panel_content\"\u003e\n 渴望恋爱的勇姐想寻找自己能转角遇爱的地方,所以他设计了算法计算出很多条线,线的交点坐标就是真爱所在的位置(渣女,还想要几个???),勇姐想知道有多少个交点。\n \u003cbr\u003e勇姐计算出了N (1 \u003c \u003d N \u003c \u003d 100)段(线段),请帮她计算有多少个路口(交点)。如果M (M\u003e2)段相交于同一点,则应重复计数。\n \u003cbr\u003e \n \u003cbr\u003e \n\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"输入包含多个测试用例。每个测试用例首先在一行中包含一个整数N (1\u003dN\u003c\u003d100),然后是N行。每一行描述一个段,它有四个浮点值x1, y1, x2, y2,它们是段结束的坐标。0表示结束。\n\u003cbr\u003e"}},{"title":"Output","value":{"format":"HTML","content":"对于每种情况,打印交点的数量。\n\u003cbr\u003e"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cpre\u003e2\n0.00 0.00 1.00 1.00\n0.00 1.00 1.00 0.00\n3\n0.00 0.00 1.00 1.00\n0.00 1.00 1.00 0.000\n0.00 0.00 1.00 0.00\n0\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cpre\u003e1\n3\u003c/pre\u003e"}}]}