{"trustable":true,"prependHtml":"\u003cstyle type\u003d\"text/css\"\u003e\n #problem-body \u003e pre {\n display: block;\n padding: 9.5px;\n margin: 0 0 10px;\n font-size: 13px;\n line-height: 1.42857143;\n word-break: break-all;\n word-wrap: break-word;\n color: #333;\n background: rgba(255, 255, 255, 0.5);\n border: 1px solid #ccc;\n border-radius: 6px;\n }\n\u003c/style\u003e\n","sections":[{"title":"","value":{"format":"HTML","content":"\u003cdiv id\u003d\"problem-body\"\u003e\n\t\u003cp\u003eYou are given N circles and expected to calculate the area of the union of the circles !\u003c/p\u003e\r\n\u003ch3\u003eInput\u003c/h3\u003e\r\n\u003cp\u003eThe first line is one integer n indicates the number of the circles. (1 \u0026lt;\u003d n \u0026lt;\u003d 1000)\u003c/p\u003e\r\n\u003cp\u003eThen follows n lines every line has three integers\u003c/p\u003e\r\n\u003cp\u003eXi Yi Ri\u003c/p\u003e\r\n\u003cp\u003eindicates the coordinate of the center of the circle, and the radius. (|Xi|. |Yi|\u0026nbsp; \u0026lt;\u003d 1000, Ri \u0026lt;\u003d 1000)\u003c/p\u003e\r\n\u003cp\u003e\u003cspan style\u003d\"color: #ff0000;\"\u003e\u003cstrong\u003eNote that in this problem Ri may be 0 and it just means one point ! \u003c/strong\u003e\u003c/span\u003e\u003c/p\u003e\r\n\u003ch3\u003eOutput\u003c/h3\u003e\r\n\u003cp\u003eThe total area that these N circles with\u0026nbsp;3 digits after decimal point\u003c/p\u003e\r\n\u003ch3\u003eExample\u003c/h3\u003e\r\n\u003cdiv\u003e\u003ctable class\u003d\"vjudge_sample\"\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e3\r\n0 0 1\n0 0 1\n100 100 1\n\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e6.283\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n\u003c/div\u003e\n\u003c/div\u003e"}}]}