{"id":303,"date":"2013-01-11T17:00:00","date_gmt":"2013-01-11T09:00:00","guid":{"rendered":"http:\/\/nike0good.jp1.rpvhost.net\/208"},"modified":"2013-01-11T17:00:00","modified_gmt":"2013-01-11T09:00:00","slug":"poj_3304_segment_straight_lines_intersect","status":"publish","type":"post","link":"https:\/\/nike0good.com\/?p=303","title":{"rendered":"POJ 3304(\u7ebf\u6bb5\u4e0e\u76f4\u7ebf\u76f8\u4ea4\uff09"},"content":{"rendered":"\n\n\n
\n
Language:\n\n\n\n
Time Limit:<\/strong> 1000MS<\/td>\n <\/td>\nMemory Limit:<\/strong> 65536K<\/td>\n<\/tr>\n
Total Submissions:<\/strong> 7144<\/td>\n <\/td>\nAccepted:<\/strong> 2135<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Description<\/p>\n

\n

\u5728\u5e73\u9762\u5185\u7ed9 n<\/em> \u6761\u7ebf\u6bb5\uff0c\u95ee\u662f\u5426\u5b58\u5728\u4e00\u6761\u76f4\u7ebf\uff0c\u4f7f\u5f97\u6240\u6709\u7ebf\u6bb5\u5728\u8fd9\u6761\u76f4\u7ebf\u4e0a\u7684\u6295\u5f71\u6709\u516c\u5171\u70b9.<\/p>\n<\/div>\n

Input<\/p>\n

\n

\u7b2c\u4e00\u884c\u8f93\u5165 T<\/em> \u8868\u793a\u6570\u636e\u7ec4\u6570\uff0c\u63a5\u4e0b\u6765 T<\/em> \u7ec4\u6570\u636e\u6bcf\u7ec4\u7b2c\u4e00\u884c\u4e00\u4e2a\u6574\u6570 n<\/em> \u2264 100 \u8868\u793a\u7ebf\u6bb5\u6570\uff0c\u63a5\u4e0b\u6765n<\/em> \u884c\u6bcf\u884c\u6709 x<\/em>1<\/sub> y<\/em>1<\/sub> x<\/em>2<\/sub> y<\/em>2<\/sub> \u8868\u793a\u7ebf\u6bb5\u7684\u4e24\u4e2a\u7aef\u70b9 (x<\/em>1<\/sub>, y<\/em>1<\/sub>) \u548c (x<\/em>2<\/sub>, y<\/em>2<\/sub>)
\n .<\/p>\n<\/div>\n

Output<\/p>\n

\n

\u5bf9\u4e8e\u6bcf\u7ec4\u6570\u636e,\u5982\u679c\u5b58\u5728\u8fd9\u6837\u7684\u76f4\u7ebf\uff0c\u8f93\u51fa\u4e00\u884c "Yes!", \u5426\u5219\u8f93\u51fa "No!" . \u7cbe\u5ea6|a<\/em> - b<\/em>| < 10-8<\/sup>.<\/p>\n<\/div>\n

Sample Input<\/p>\n

3\n2\n1.0 2.0 3.0 4.0\n4.0 5.0 6.0 7.0\n3\n0.0 0.0 0.0 1.0\n0.0 1.0 0.0 2.0\n1.0 1.0 2.0 1.0\n3\n0.0 0.0 0.0 1.0\n0.0 2.0 0.0 3.0\n1.0 1.0 2.0 1.0<\/pre>\n
Sample Output<\/p>\n
Yes!\nYes!\nNo!<\/pre>\n
Source<\/p>\n
\nAmirkabir University of Technology Local Contest 2006<\/a><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\n<\/span><\/p>\n
\u663e\u7136\u8be5\u9898\u53ef\u8f6c\u6362\u4e3a\u662f\u5426\u5b58\u5728\u4e00\u6761\u76f4\u7ebf\u4e0e\u6240\u6709\u7ebf\u6bb5\u76f8\u4ea4\u3002\uff08\u5982\u679c\u5b58\u5728\uff0c\u5219\u901a\u8fc7\u79fb\u52a8\u9009\u8f6c\uff0c\u4f7f\u5176\u8fc7\u76842\u4e2a\u7ebf\u6bb5\u7684\u7aef\u70b9\uff09<\/span><\/p>\n
\u9700\u8981\u7279\u52242\u4e2a\u70b9\u5982\u679c\u76f8\u540c\uff0c\u90a3\u4e48\u8fde\u4e0d\u6210\u7ebf\u6bb5\uff0c\u56e0\u4e3a\u6700\u540e\u53c9\u79ef\u7b97\u51fa\u6765\u4e3a0.<\/span><\/p>\n

\n<\/span><\/p>\n
<\/span><\/p>\n
#include<cstdio>\n#include<cstdlib>\n#include<cstring>\n#include<cmath>\n#include<iostream>\nusing namespace std;\n#define eps 1e-8\n#define MAXN (200+10)\nstruct P\n{\n\tlong double x,y;\n\tP(){}\n\tP(long double _x,long double _y):x(_x),y(_y){}\n}a[MAXN*2];\nstruct V\n{\n\tlong double x,y;\n\tV(){}\n\tV(long double _x,long double _y):x(_x),y(_y){}\n\tV(P a,P b):x(b.x-a.x),y(b.y-a.y){}\n};\nstruct S\n{\n\tP A,B;\n\tS(P _A,P _B):A(_A),B(_B){}\n\tS(){}\n};\ndouble operator*(V a,V b)\n{\n\treturn a.x*b.y-b.x*a.y;\n}\nbool corr(P A,P B,P C,P D)\n{\n\tV AB=V(A,B),AC=V(A,C),AD=V(A,D);\n\treturn ((AC*AB)*(AB*AD)>-eps);\n}\nbool fabs (double a,double b)\n{\n\tif (abs(a-b)<eps) return 1 ;return 0;\n}\nbool fabs(P A,P B)\n{\n\treturn (fabs(A.x,B.x)&&fabs(A.y,B.y));\n}\nint t,n;\nint main()\n{\n\/\/\tfreopen("poj3304.in","r",stdin);\n\tscanf("%d",&t);\n\twhile (t--)\n\t{\n\t\tcin>>n;\n\t\tbool flag=0;\n\t\tfor (int i=1;i<=2*n;i++) cin>>a[i].x>>a[i].y;\n\t\tfor (int i=1;i<2*n&&!flag;i++)\n\t\t{\n\t\t\tfor (int j=i+1;j<=2*n;j++)\n\t\t\t{\n\t\t\t\tif (fabs(a[i],a[j])) continue;\n\t\t\t\tS l=S(a[i],a[j]);\n\t\t\t\tint k;\n\t\t\t\tfor (k=1;k<=n;k++)\n\t\t\t\t{\n\t\t\t\t\tif (!corr(l.A,l.B,a[k*2-1],a[k*2])) break;\n\t\t\t\t\/\/\tcout<<k;\n\t\t\t\t}\n\t\t\t\tif (k==n+1) {cout<<"Yes!n"; flag=1;break;}\n\t\t\t}\n\t\t}\n\n\t\tif (!flag) cout<<"No!n";\n\n\n\t}\n\treturn 0;\n}<\/pre>\n<\/p>\n

\n<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
Language: Default Segments Time Limit: 1000MS &nbs […]<\/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":[117],"class_list":["post-303","post","type-post","status-publish","format-standard","hentry","category-defaultcategory","tag-computational_geometry"],"yoast_head":"\nPOJ 3304(\u7ebf\u6bb5\u4e0e\u76f4\u7ebf\u76f8\u4ea4\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=303\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"POJ 3304(\u7ebf\u6bb5\u4e0e\u76f4\u7ebf\u76f8\u4ea4\uff09 - nike0good\" \/>\n<meta property=\"og:description\" content=\"Language: Default Segments Time Limit: 1000MS &nbs […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/nike0good.com\/?p=303\" \/>\n<meta property=\"og:site_name\" content=\"nike0good\" \/>\n<meta property=\"article:published_time\" content=\"2013-01-11T09:00:00+00:00\" \/>\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=303#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=303\"},\"author\":{\"name\":\"nike0good\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/#\\\/schema\\\/person\\\/4defa38da89de87e400861e73396baad\"},\"headline\":\"POJ 3304(\u7ebf\u6bb5\u4e0e\u76f4\u7ebf\u76f8\u4ea4\uff09\",\"datePublished\":\"2013-01-11T09:00:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=303\"},\"wordCount\":75,\"commentCount\":0,\"keywords\":[\"\u8ba1\u7b97\u51e0\u4f55\"],\"articleSection\":[\"DefaultCategory\"],\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/nike0good.com\\\/?p=303#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=303\",\"url\":\"https:\\\/\\\/nike0good.com\\\/?p=303\",\"name\":\"POJ 3304(\u7ebf\u6bb5\u4e0e\u76f4\u7ebf\u76f8\u4ea4\uff09 - nike0good\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/nike0good.com\\\/#website\"},\"datePublished\":\"2013-01-11T09:00:00+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/nike0good.com\\\/#\\\/schema\\\/person\\\/4defa38da89de87e400861e73396baad\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=303#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/nike0good.com\\\/?p=303\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=303#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/nike0good.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"POJ 3304(\u7ebf\u6bb5\u4e0e\u76f4\u7ebf\u76f8\u4ea4\uff09\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/#website\",\"url\":\"https:\\\/\\\/nike0good.com\\\/\",\"name\":\"nike0good\",\"description\":\"\u6709\u6240\u4f5c\u4e3a\u662f\u4eba\u751f\u7684\u6700\u9ad8\u5883\u754c\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/nike0good.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/#\\\/schema\\\/person\\\/4defa38da89de87e400861e73396baad\",\"name\":\"nike0good\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/8e5fa08d5c367a1a6fb5ff13bb10ed5a331f981513256951290ae42322da6854?s=96&d=identicon&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/8e5fa08d5c367a1a6fb5ff13bb10ed5a331f981513256951290ae42322da6854?s=96&d=identicon&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/8e5fa08d5c367a1a6fb5ff13bb10ed5a331f981513256951290ae42322da6854?s=96&d=identicon&r=g\",\"caption\":\"nike0good\"},\"sameAs\":[\"https:\\\/\\\/nike0good.com\"],\"url\":\"https:\\\/\\\/nike0good.com\\\/?author=1\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"POJ 3304(\u7ebf\u6bb5\u4e0e\u76f4\u7ebf\u76f8\u4ea4\uff09 - nike0good","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/nike0good.com\/?p=303","og_locale":"zh_CN","og_type":"article","og_title":"POJ 3304(\u7ebf\u6bb5\u4e0e\u76f4\u7ebf\u76f8\u4ea4\uff09 - nike0good","og_description":"Language: Default Segments Time Limit: 1000MS &nbs […]","og_url":"https:\/\/nike0good.com\/?p=303","og_site_name":"nike0good","article_published_time":"2013-01-11T09:00:00+00:00","author":"nike0good","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"nike0good","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"2 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/nike0good.com\/?p=303#article","isPartOf":{"@id":"https:\/\/nike0good.com\/?p=303"},"author":{"name":"nike0good","@id":"https:\/\/nike0good.com\/#\/schema\/person\/4defa38da89de87e400861e73396baad"},"headline":"POJ 3304(\u7ebf\u6bb5\u4e0e\u76f4\u7ebf\u76f8\u4ea4\uff09","datePublished":"2013-01-11T09:00:00+00:00","mainEntityOfPage":{"@id":"https:\/\/nike0good.com\/?p=303"},"wordCount":75,"commentCount":0,"keywords":["\u8ba1\u7b97\u51e0\u4f55"],"articleSection":["DefaultCategory"],"inLanguage":"zh-Hans","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/nike0good.com\/?p=303#respond"]}]},{"@type":"WebPage","@id":"https:\/\/nike0good.com\/?p=303","url":"https:\/\/nike0good.com\/?p=303","name":"POJ 3304(\u7ebf\u6bb5\u4e0e\u76f4\u7ebf\u76f8\u4ea4\uff09 - nike0good","isPartOf":{"@id":"https:\/\/nike0good.com\/#website"},"datePublished":"2013-01-11T09:00:00+00:00","author":{"@id":"https:\/\/nike0good.com\/#\/schema\/person\/4defa38da89de87e400861e73396baad"},"breadcrumb":{"@id":"https:\/\/nike0good.com\/?p=303#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/nike0good.com\/?p=303"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/nike0good.com\/?p=303#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/nike0good.com\/"},{"@type":"ListItem","position":2,"name":"POJ 3304(\u7ebf\u6bb5\u4e0e\u76f4\u7ebf\u76f8\u4ea4\uff09"}]},{"@type":"WebSite","@id":"https:\/\/nike0good.com\/#website","url":"https:\/\/nike0good.com\/","name":"nike0good","description":"\u6709\u6240\u4f5c\u4e3a\u662f\u4eba\u751f\u7684\u6700\u9ad8\u5883\u754c","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/nike0good.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/nike0good.com\/#\/schema\/person\/4defa38da89de87e400861e73396baad","name":"nike0good","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/secure.gravatar.com\/avatar\/8e5fa08d5c367a1a6fb5ff13bb10ed5a331f981513256951290ae42322da6854?s=96&d=identicon&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/8e5fa08d5c367a1a6fb5ff13bb10ed5a331f981513256951290ae42322da6854?s=96&d=identicon&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/8e5fa08d5c367a1a6fb5ff13bb10ed5a331f981513256951290ae42322da6854?s=96&d=identicon&r=g","caption":"nike0good"},"sameAs":["https:\/\/nike0good.com"],"url":"https:\/\/nike0good.com\/?author=1"}]}},"_links":{"self":[{"href":"https:\/\/nike0good.com\/index.php?rest_route=\/wp\/v2\/posts\/303","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nike0good.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nike0good.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nike0good.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nike0good.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=303"}],"version-history":[{"count":0,"href":"https:\/\/nike0good.com\/index.php?rest_route=\/wp\/v2\/posts\/303\/revisions"}],"wp:attachment":[{"href":"https:\/\/nike0good.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=303"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nike0good.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=303"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nike0good.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=303"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}