{"id":305,"date":"2013-01-18T11:54:00","date_gmt":"2013-01-18T03:54:00","guid":{"rendered":"http:\/\/nike0good.jp1.rpvhost.net\/210"},"modified":"2013-01-18T11:54:00","modified_gmt":"2013-01-18T03:54:00","slug":"poj_2187_convex_hull_grahamscan_scan__polar_angle_of_the_the_sort__plane_farthest_point_on_the","status":"publish","type":"post","link":"https:\/\/nike0good.com\/?p=305","title":{"rendered":"POJ 2187(\u51f8\u5305GrahamScan\u626b\u63cf+\u6781\u89d2\u6392\u5e8f+\u5e73\u9762\u6700\u8fdc\u70b9\u5bf9\uff09"},"content":{"rendered":"<table border=\"0\" width=\"100%\" background=\"http:\/\/poj.org\/images\/table_back.jpg\" style=\"font-family:Simsun\">\n<tbody>\n<tr>\n<td>\n<div style=\"position:absolute; right:10px\">Language:<select size=\"1\"><option value=\"default\" selected=\"selected\"><br \/>\nDefault<\/option><\/select><\/div>\n<div class=\"ptt\" lang=\"en-US\" style=\"text-align:center; font-size:18pt; font-weight:bold; color:blue\">\n\u5e73\u9762\u6700\u8fdc\u70b9\u5bf9<\/div>\n<div class=\"plm\" style=\"text-align:center; font-size:12pt\">\n<table align=\"center\">\n<tbody>\n<tr>\n<td><strong>Time Limit:<\/strong>&nbsp;3000MS<\/td>\n<td width=\"10px\">&nbsp;<\/td>\n<td><strong>Memory Limit:<\/strong>&nbsp;65536K<\/td>\n<\/tr>\n<tr>\n<td><strong>Total Submissions:<\/strong>&nbsp;22454<\/td>\n<td width=\"10px\">&nbsp;<\/td>\n<td><strong>Accepted:<\/strong>&nbsp;6868<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"pst\" style=\"font-size:18pt; font-weight:bold; color:blue\">Description<\/p>\n<div class=\"ptx\" lang=\"en-US\" style=\"font-family:'Times New Roman',Times,serif; font-size:12pt\">\n\u6c42 N (2 &lt;= N &lt;= 50,000) \u4e2a\u70b9\u5e73\u9762\u6700\u8fdc\u70b9\u5bf9\u8ddd\u79bb<span style=\"font-family:'Times New Roman',Times,serif; font-size:16px\">\u7684<\/span>\u5e73\u65b9.&nbsp;<\/p>\n<\/div>\n<p class=\"pst\" style=\"font-size:18pt; font-weight:bold; color:blue\">Input<\/p>\n<div class=\"ptx\" lang=\"en-US\" style=\"font-family:'Times New Roman',Times,serif; font-size:12pt\">\n* \u7b2c1\u884c:N&nbsp;<\/p>\n<p>\u63a5\u4e0b\u6765\u6bcf\u884c\u4e3a\u70b9\u7684\u5750\u6807 x \u548c y ,<span style=\"font-family:'Times New Roman',Times,serif; font-size:16px\">(x,y)(-10,000&lt;=x,y&lt;=10,000\u7684\u6574\u6570).<\/span>&nbsp;\n<\/div>\n<p class=\"pst\" style=\"font-size:18pt; font-weight:bold; color:blue\">Output<\/p>\n<div class=\"ptx\" lang=\"en-US\" style=\"font-family:'Times New Roman',Times,serif; font-size:12pt\">\n\u8f93\u51fa\u4e00\u884c\uff0c\u4e3a\u5e73\u9762\u6700\u8fdc\u70b9\u5bf9\u8ddd\u79bb\u5e73\u65b9.&nbsp;\n<\/div>\n<p class=\"pst\" style=\"font-size:18pt; font-weight:bold; color:blue\">Sample Input<\/p>\n<pre class=\"sio\" style=\"font-family:'Courier New',Courier,monospace; font-size:12pt\">4\n0 0\n0 1\n1 1\n1 0\n<\/pre>\n<p class=\"pst\" style=\"font-size:18pt; font-weight:bold; color:blue\">Sample Output<\/p>\n<pre class=\"sio\" style=\"font-family:'Courier New',Courier,monospace; font-size:12pt\">2\n<\/pre>\n<p class=\"pst\" style=\"font-size:18pt; font-weight:bold; color:blue\">Hint<\/p>\n<div class=\"ptx\" lang=\"en-US\" style=\"font-family:'Times New Roman',Times,serif; font-size:12pt\">\n(0, 0) a\u5230 (1, 1) \u8ddd\u79bb\u5e73\u65b9\u4e3a 2&nbsp;\n<\/div>\n<p class=\"pst\" style=\"font-size:18pt; font-weight:bold; color:blue\">Source<\/p>\n<div class=\"ptx\" lang=\"en-US\" style=\"font-family:'Times New Roman',Times,serif; font-size:12pt\">\n<a href=\"http:\/\/poj.org\/searchproblem?field=source&amp;key=USACO+2003+Fall\" style=\"text-decoration:none\">USACO 2003 Fall<\/a><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><span style=\"font-size:14px\">\u51f8\u5305\u6a21\u7248\u9898<\/span><span style=\"font-size:14px\">\uff1a<\/span><\/p>\n<p><span style=\"font-size:14px\">\u5148\u7528GrahamScan\u626b\u63cf\u6c42\u51f8\u5305\uff0c\u663e\u7136\u6700\u8fdc\u70b9\u5bf9\u5728\u51f8\u5305\u4e0a\u3002<\/span><\/p>\n<p><span style=\"font-size:14px\"><br \/>\n<\/span><\/p>\n<p><span style=\"font-size:14px\">\u6781\u89d2\u6392\u5e8f\uff1a<\/span><\/p>\n<p><span style=\"font-size:14px\">\u6309\u7167\u9006\u65f6\u9488\u987a\u5e8f\u7ed9\u5e73\u9762\u4e0a\u7684\u70b9\u96c6\u5230\u4e00\u4e2a\u70b9\u7684\u8ddd\u79bb\u6392\u5e8f\uff0c\u4f7f\u5f97\u6392\u5e8f\u540e\u6240\u6709\u70b9\u6b63\u597d\u7ed5\u8fd9\u4e2a\u70b9\u4e00\u5708.\uff08\u6309\u8ddd\u79bb\u8fdc\u8fd1\u4ece\u5c0f\u5230\u5927\u6392<\/span><\/p>\n<p><span style=\"font-size:14px\">\u601d\u8def\uff1a<\/span><\/p>\n<p><span style=\"font-size:14px\"><img decoding=\"async\" src=\"http:\/\/nike0good.jp1.rpvhost.net\/wp-content\/uploads\/csdn\/other_site\/img_my_1358481012_3034.png\" alt=\"\" \/><br \/>\n<\/span><\/p>\n<p><span style=\"font-size:14px\">GrahamScan\u626b\u63cf\uff1a<\/span><\/p>\n<p><img decoding=\"async\" src=\"http:\/\/nike0good.jp1.rpvhost.net\/wp-content\/uploads\/csdn\/other_site\/img_my_1358481252_5499.png\" alt=\"\" \/>\n<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/nike0good.jp1.rpvhost.net\/wp-content\/uploads\/csdn\/other_site\/img_my_1358481266_9820.png\" alt=\"\" \/>\n<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/nike0good.jp1.rpvhost.net\/wp-content\/uploads\/csdn\/other_site\/img_my_1358481274_2957.png\" alt=\"\" \/>\n<\/p>\n<p><span style=\"font-size:14px\"><img decoding=\"async\" src=\"http:\/\/nike0good.jp1.rpvhost.net\/wp-content\/uploads\/csdn\/other_site\/img_my_1358481284_1561.png\" alt=\"\" \/><br \/>\n<\/span><\/p>\n<p><span style=\"font-size:14px\"><span style=\"font-size:14px\"><img decoding=\"async\" src=\"http:\/\/nike0good.jp1.rpvhost.net\/wp-content\/uploads\/csdn\/other_site\/img_my_1358481299_8147.png\" alt=\"\" \/><br \/>\n<\/span><\/span><\/p>\n<p><span style=\"font-size:14px\"><span style=\"font-size:14px\"><img decoding=\"async\" src=\"http:\/\/nike0good.jp1.rpvhost.net\/wp-content\/uploads\/csdn\/other_site\/img_my_1358481306_8727.png\" alt=\"\" \/><br \/>\n<\/span><\/span><\/p>\n<p><span style=\"font-size:14px\"><span style=\"font-size:14px\"><img decoding=\"async\" src=\"http:\/\/nike0good.jp1.rpvhost.net\/wp-content\/uploads\/csdn\/other_site\/img_my_1358481318_2135.png\" alt=\"\" \/><br \/>\n<\/span><\/span><\/p>\n<p><span style=\"font-size:14px\"><span style=\"font-size:14px\"><img decoding=\"async\" src=\"http:\/\/nike0good.jp1.rpvhost.net\/wp-content\/uploads\/csdn\/other_site\/img_my_1358481321_3422.png\" alt=\"\" \/><br \/>\n<\/span><\/span><\/p>\n<p><span style=\"font-size:14px\"><span style=\"font-size:14px\"><img decoding=\"async\" src=\"http:\/\/nike0good.jp1.rpvhost.net\/wp-content\/uploads\/csdn\/other_site\/img_my_1358481325_3832.png\" alt=\"\" \/><br \/>\n<\/span><\/span><\/p>\n<p><span style=\"font-size:14px\">\u5927\u81f4\u5982\u6b64.<\/span><\/p>\n<p><span style=\"font-size:14px\"><br \/>\n<\/span><\/p>\n<p><span style=\"font-size:14px\">\u53e6\u8865\uff1a<\/span><\/p>\n<p><span style=\"font-size:14px\"><span style=\"font-size:14px\">\u8be5\u9898\u5c0fBug-\u6709\u53ef\u80fd\u6240\u6709\u70b9\u5728\u4e00\u6761\u76f4\u7ebf\u4e0a\u3002<\/span><\/span><\/p>\n<p><span style=\"font-size:14px\"><span style=\"font-size:14px\">\u8fd9\u6837\u4e5f\u80fd\u6c42\u51fa\uff1a<\/span><\/span><\/p>\n<p><span style=\"font-size:14px\"><span style=\"font-size:14px\">Ex:<\/span><\/span><\/p>\n<p><span style=\"font-size:14px\">a\u5e8f\u5217\uff08-1\uff0c0\uff09 \uff080\uff0c0) &nbsp; &nbsp;\uff084\uff0c0\uff09 &nbsp; \uff089\uff0c0\uff09<\/span><\/p>\n<p><span style=\"font-size:14px\"><span style=\"font-size:14px\">\u5219st\u5e8f\u5217\u91cd\u590d\u5982\u4e0b\u64cd\u4f5c\uff1a<\/span><\/span><\/p>\n<p><span style=\"font-size:14px\"><span style=\"font-size:14px\">\uff08-1\uff0c1\uff09\uff0c\uff080\uff0c0\uff09\u5165\u961f\u3002<\/span><\/span><\/p>\n<p><span style=\"font-size:14px\"><span style=\"font-size:14px\">\uff084\uff0c0\uff09\u5165\u961f\uff0c\u4e0d\u5de6\u62d0-&gt;\uff080\uff0c0\uff09\u51fa\u961f<\/span><\/span><\/p>\n<p><span style=\"font-size:14px\">\u961f\u5217\u5143\u7d20&lt;2 \uff084\uff0c0\uff09\u5165\u961f<\/span><\/p>\n<p><span style=\"font-size:14px\">\u2026\u2026<\/span><\/p>\n<p><span style=\"font-size:14px\"><br \/>\n<\/span><\/p>\n<p><span style=\"font-size:14px\"><\/span><\/p>\n<pre name=\"code\" class=\"cpp\">#include&lt;cstdio&gt;\n#include&lt;cstdlib&gt;\n#include&lt;cstring&gt;\n#include&lt;cmath&gt;\n#include&lt;iostream&gt;\n#include&lt;algorithm&gt;\n#include&lt;functional&gt;\nusing namespace std;\n#define MAXN (50000+10)\ndouble sqr(double x){return x*x;}\nstruct P\n{\n\tdouble x,y;\n\tP(){}\n\tP(double _x,double _y):x(_x),y(_y){}\n}a[MAXN],st[MAXN];\nint dis2(P A,P B)\n{\n\treturn sqr(A.x-B.x)+sqr(A.y-B.y);\n}\ndouble dis(P A,P B)\n{\n\treturn sqrt(double(dis2(A,B)));\n}\nstruct V\n{\n\tdouble x,y;\n\tV(){}\n\tV(double _x,double _y):x(_x),y(_y){}\n\tV(P A,P B):x(B.x-A.x),y(B.y-A.y){}\n};\ndouble operator*(V a,V b)\n{\n\treturn a.x*b.y-a.y*b.x;\n}\nint cmp(P A,P B) \/\/1:a&gt;b 0:a&lt;=b\n{\n\tdouble tmp=V(a[1],A)*V(a[1],B);\n\tif (tmp&gt;0) return 1;\n\telse if (tmp==0) return (-(dis(a[1],A)-dis(a[1],B))&gt;0)?1:0;\n\telse return 0;\n}\nint n;\nint main()\n{\n\tscanf(&quot;%d&quot;,&amp;n);\n\tfor (int i=1;i&lt;=n;i++) cin&gt;&gt;a[i].x&gt;&gt;a[i].y;\n\tint p=1;\n\tfor (int i=2;i&lt;=n;i++) if (a[i].x&lt;a[p].x||a[i].x==a[p].x&amp;&amp;a[i].y&lt;a[p].y) p=i;\n\tif (p&gt;1) swap(a[p],a[1]);\n\tsort(a+2,a+1+n,cmp);\n\n\tint size=1;\n\tst[1]=a[1];\n\tfor (int i=2;i&lt;=n;)\n\t\tif (size&lt;2||V(st[size-1],st[size])*V(st[size],a[i])&gt;0)\n\t\t\tst[++size]=a[i++];\n\t\telse size--;\n\n\tint ans=0;\n\tfor (int i=1;i&lt;size;i++)\n\t\tfor (int j=i+1;j&lt;=size;j++)\n\t\t\tans=max(ans,dis2(st[i],st[j]));\n\tcout&lt;&lt;ans&lt;&lt;endl;\n\n\n\treturn 0;\n}<\/pre>\n<\/p>\n<p><span style=\"font-size:14px\"><span style=\"font-size:14px\"><br \/>\n<\/span><\/span><\/p>\n<p><span style=\"font-size:14px\"><span style=\"font-size:14px\"><br \/>\n<\/span><\/span><\/p>\n<p><span style=\"font-size:14px\"><span style=\"font-size:14px\"><br \/>\n<\/span><\/span><\/p>\n<p><span style=\"font-size:14px\"><br \/>\n<\/span><\/p>\n<p><span style=\"font-size:14px\"><br \/>\n<\/span><\/p>\n<p><span style=\"font-size:14px\"><br \/>\n<\/span><\/p>\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Language: Default \u5e73\u9762\u6700\u8fdc\u70b9\u5bf9 Time Limit:&nbsp;3000MS &nbsp; [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":""},"categories":[3],"tags":[57,117],"class_list":["post-305","post","type-post","status-publish","format-standard","hentry","category-defaultcategory","tag-convex_hull","tag-computational_geometry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>POJ 2187(\u51f8\u5305GrahamScan\u626b\u63cf+\u6781\u89d2\u6392\u5e8f+\u5e73\u9762\u6700\u8fdc\u70b9\u5bf9\uff09 - nike0good<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/nike0good.com\/?p=305\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"POJ 2187(\u51f8\u5305GrahamScan\u626b\u63cf+\u6781\u89d2\u6392\u5e8f+\u5e73\u9762\u6700\u8fdc\u70b9\u5bf9\uff09 - nike0good\" \/>\n<meta property=\"og:description\" content=\"Language: Default \u5e73\u9762\u6700\u8fdc\u70b9\u5bf9 Time Limit:&nbsp;3000MS &nbsp; [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/nike0good.com\/?p=305\" \/>\n<meta property=\"og:site_name\" content=\"nike0good\" \/>\n<meta property=\"article:published_time\" content=\"2013-01-18T03:54:00+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/nike0good.jp1.rpvhost.net\/wp-content\/uploads\/csdn\/other_site\/img_my_1358481012_3034.png\" \/>\n<meta name=\"author\" content=\"nike0good\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"nike0good\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=305#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=305\"},\"author\":{\"name\":\"nike0good\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/#\\\/schema\\\/person\\\/4defa38da89de87e400861e73396baad\"},\"headline\":\"POJ 2187(\u51f8\u5305GrahamScan\u626b\u63cf+\u6781\u89d2\u6392\u5e8f+\u5e73\u9762\u6700\u8fdc\u70b9\u5bf9\uff09\",\"datePublished\":\"2013-01-18T03:54:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=305\"},\"wordCount\":64,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=305#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/nike0good.jp1.rpvhost.net\\\/wp-content\\\/uploads\\\/csdn\\\/other_site\\\/img_my_1358481012_3034.png\",\"keywords\":[\"\u51f8\u5305\",\"\u8ba1\u7b97\u51e0\u4f55\"],\"articleSection\":[\"DefaultCategory\"],\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/nike0good.com\\\/?p=305#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=305\",\"url\":\"https:\\\/\\\/nike0good.com\\\/?p=305\",\"name\":\"POJ 2187(\u51f8\u5305GrahamScan\u626b\u63cf+\u6781\u89d2\u6392\u5e8f+\u5e73\u9762\u6700\u8fdc\u70b9\u5bf9\uff09 - 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