{"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":"MD","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 给定平面上若干矩形,求出被这些矩形覆盖过至少两次的区域的面积. \n \u003cbr\u003e \n \u003cbr\u003e \n \u003ccenter\u003e \n \u003cimg style\u003d\"max-width:100%;\" SRC\u003d\"CDN_BASE_URL/d1adc6253c233d9968f03fe1d872f86d?v\u003d1573417660\"\u003e \n \u003c/center\u003e \n \u003cbr\u003e \n\u003c/div\u003e"}},{"title":"Input","value":{"format":"MD","content":"左下角坐标和右上角坐标\n\u003c/hr\u003e\n输入数据的第一行是一个正整数T(1\u0026lt;\u003dT\u0026lt;\u003d100),代表测试数据的数量.每个测试数据的第一行是一个正整数N(1\u0026lt;\u003dN\u0026lt;\u003d1000),代表矩形的数量,然后是N行数据,每一行包含四个浮点数,代表平面上的一个矩形的左下角坐标和右上角坐标,矩形的上下边和X轴平行,左右边和Y轴平行.坐标的范围从0到100000. \n\u003cbr\u003e \n\u003cbr\u003e注意:本题的输入数据较多,推荐使用scanf读入数据. \n\u003cbr\u003e"}},{"title":"Output","value":{"format":"MD","content":"对于每组测试数据,请计算出被这些矩形覆盖过至少两次的区域的面积.结果保留两位小数. \n\u003cbr\u003e"}},{"title":"Sample Input","value":{"format":"MD","content":"\u003cpre\u003e2\n5\n1 1 4 2\n1 3 3 7\n2 1.5 5 4.5\n3.5 1.25 7.5 4\n6 3 10 7\n3\n0 0 1 1\n1 0 2 1\n2 0 3 1\u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"MD","content":"\u003cpre\u003e7.63\n0.00\u003c/pre\u003e"}}]}