{"id":365,"date":"2013-03-25T12:51:00","date_gmt":"2013-03-25T04:51:00","guid":{"rendered":"http:\/\/nike0good.jp1.rpvhost.net\/269"},"modified":"2013-03-25T12:51:00","modified_gmt":"2013-03-25T04:51:00","slug":"the_enclosure_slope_sort__coordinate_system_rotation","status":"publish","type":"post","link":"https:\/\/nike0good.com\/?p=365","title":{"rendered":"\u5708\u5730(\u659c\u7387\u6392\u5e8f+\u5750\u6807\u7cfb\u65cb\u8f6c)"},"content":{"rendered":"

Problem 2 \u5708\u5730(land.cpp\/c\/pas)<\/p>\n

\u3010\u9898\u76ee\u63cf\u8ff0\u3011<\/p>\n

2\u7ef4\u5e73\u9762\u4e0a\u6709n\u4e2a\u6728\u6869\uff0c\u4f60\u6709\u4e00\u6b21\u5708\u5730\u7684\u673a\u4f1a\u5e76\u5f97\u5230\u5708\u5230\u7684\u571f\u5730\uff0c\u4e3a\u4e86\u4f53\u73b0\u4f60\u7684\u9ad8\u98ce\u4eae\u8282\uff0c\u4f60\u8981\u4f7f\u4f60\u5708\u5230\u7684\u571f\u5730\u9762\u79ef\u5c3d\u91cf\u5c0f\u3002\u5708\u5730\u9700\u8981\u5708\u4e00\u4e2a\u81f3\u5c113\u4e2a\u70b9\u7684\u591a\u8fb9\u5f62\uff0c\u591a\u8fb9\u5f62\u7684\u9876\u70b9\u5c31\u662f\u4e00\u4e2a\u6728\u6869\uff0c\u5708\u5f97\u7684\u571f\u5730\u5c31\u662f\u8fd9\u4e2a\u591a\u8fb9\u5f62\u5185\u90e8\u7684\u571f\u5730\u3002<\/p>\n

 <\/p>\n

\u3010\u8f93\u5165格\u5f0f\u3011<\/p>\n

\u7b2c\u4e00\u884c\u4e00\u4e2a\u6574\u6570n\uff0c\u8868\u793a\u6728\u6869\u4e2a\u6570\u3002
\n\u3000\u3000\u63a5\u4e0b\u6765n\u884c\uff0c\u6bcf\u884c2\u4e2a\u6574\u6570\u8868\u793a\u4e00\u4e2a\u6728\u6869\u7684\u5750\u6807\uff0c\u5750\u6807\u4e24\u4e24\u4e0d\u540c\u3002<\/p>\n

\u3010\u8f93\u51fa格\u5f0f\u3011<\/p>\n

\u4ec5\u4e00\u884c\uff0c\u8868\u793a\u6700\u5c0f\u5708\u5f97\u7684\u571f\u5730\u9762\u79ef\uff0c\u4fdd\u75592\u4f4d\u5c0f\u6570\u3002<\/p>\n

\u3010\u6837\u4f8b\u8f93\u5165\u3011<\/p>\n

\u6837\u4f8b1\uff1a
\n3<\/p>\n

0 0<\/p>\n

0 1<\/p>\n

1 0<\/p>\n

\u6837\u4f8b2\uff1a
\n4<\/p>\n

0 0<\/p>\n

0 1<\/p>\n

0 2<\/p>\n

1 1<\/p>\n

\u3010\u6837\u4f8b\u8f93\u51fa\u3011<\/p>\n

\u6837\u4f8b1\uff1a
\n0.50
\n\u6837\u4f8b2\uff1a
\n0.00
\n\u3010\u6570\u636e\u8303\u56f4\u3011<\/p>\n

    \u5bf9\u4e8e10%\u7684\u6570\u636e\uff0cn<=100\uff1b
\n\u3000\u5bf9\u4e8e30%\u7684\u6570\u636e\uff0cn<=300\uff1b
\n\u3000\u5bf9\u4e8e50%\u7684\u6570\u636e\uff0cn<=500\uff1b
\n\u3000\u5bf9\u4e8e100%\u7684\u6570\u636e\uff0cn<=1000\u3002<\/p>\n

\n<\/p>\n

\u663e\u7136\u8fd9\u9898\u7684\u591a\u8fb9\u5f62\u4e00\u5b9a\u662f\u4e09\u89d2\u5f62\u3002<\/span><\/p>\n

\u9996\u5148\u6c42\u51fa\u6240\u6709\u8fb9\uff0c\u6309k\u6392\u5e8f\uff08\u5fc5\u987b\u5148\u6c42\u51fa\u6765\uff0c\u4e0d\u80fd\u76f4\u63a5\u5728\u6392\u5e8f\u7684\u65f6\u5019\u6c42\uff09<\/span><\/p>\n

\u7136\u540e\u8003\u8651\u8fd9\u4e9b\u8fb9\uff0c\u4f1a\u53d1\u73b0\u6b63\u597d\u662f\u7ed5\u5750\u6807\u7cfb\u65cb\u8f6c\u4e00\u5708\u3002<\/span><\/p>\n

\u4e5f\u5c31\u662f\u8bf4\u5982\u679c\u6309\u7167\u4ee5\u8fd9\u8fb9\u4e3ay\u8f74\u4ece\u5de6\u81f3\u53f3\u6392\u5e8f\uff0c\u90a3\u4e48\u6bcf\u8f6c\u79fb\u4e00\u6761\u8fb9\uff0c\u53ea\u9700\u8981\u8c03\u6362\u8be5\u8fb92\u4e2a\u70b9\u7684\u4f4d\u7f6e<\/span><\/p>\n

\u8fd9\u9898\u6ca1\u7ed9\u8303\u56f4\uff0c\u4f46\u662f\u5fc5\u987b\u7528long long<\/span><\/p>\n

<\/span><\/p>\n

#include<cstdio>\n#include<cstdlib>\n#include<cstring>\n#include<algorithm>\n#include<functional>\n#include<iostream>\n#include<cmath>\nusing namespace std;\n#define MAXN (1000+10)\n#define INF (1000000000)\n#define eps 1e-10\nstruct P\n{\n\tint x,y;\n\tlong long operator*(const P &b)\n\t{\n\t\treturn (long long)x*b.y-(long long)b.x*y;\n\t}\n\tfriend bool operator<(P a,P b){if (a.x^b.x)\treturn a.x<b.x;return a.y<b.y;}\n}a[MAXN];\nlong long abs2(long long x){if (x>0) return x;return -x;}\nint n,h[MAXN];\nstruct E\n{\n\tint i,j;\n\tdouble k;\n\tE(){}\n\tE(int _i,int _j):i(_i),j(_j){if (a[i].x==a[j].x) k=1e10;else k=(double)(a[i].y-a[j].y)\/(a[i].x-a[j].x);}\n\tfriend bool operator<(E a,E b){return a.k<b.k;\t}\n}e[MAXN*MAXN\/2];\nlong long S2(P A,P B,P C)\n{\n\treturn abs2(A*B+B*C+C*A);\n}\nint size=0;\nint main()\n{\n\tfreopen("land.in","r",stdin);\n\tfreopen("land.out","w",stdout);\n\tscanf("%d",&n);\n\tfor (int i=1;i<=n;i++) scanf("%d%d",&a[i].x,&a[i].y);\n\tlong long ans=(long long)1<<60;\n\t\/*\n\tfor (int i=1;i<=n-2;i++)\n\t\tfor (int j=i+1;j<n;j++)\n\t\t\tfor (int k=j+1;k<=n;k++)\n\t\t\t\tans=min(ans,abs2(a[i]*a[j]+a[j]*a[k]+a[k]*a[i]));\n\t*\/\n\n\tsort(a+1,a+1+n);\n\tfor (int i=1;i<=n;i++) h[i]=i;\n\tfor (int i=1;i<n;i++)\n\t\tfor (int j=i+1;j<=n;j++)\n\t\t{\n\t\t\te[++size]=E(i,j);\n\t\t}\n\n\tsort(e+1,e+1+size);\n\n\tfor (int i=1;i<=size&&ans;i++)\n\t{\n\t\tif (h[e[i].i]>1&&h[e[i].i]<n) ans=min(ans,S2(a[h[e[i].i]-1],a[h[e[i].i]],a[h[e[i].i]+1]));\n\t\tif (h[e[i].j]>1&&h[e[i].j]<n) ans=min(ans,S2(a[h[e[i].j]-1],a[h[e[i].j]],a[h[e[i].j]+1]));\n\t\tswap(a[h[e[i].i]],a[h[e[i].j]]);\n\t\tswap(h[e[i].i],h[e[i].j]);\n\t}\n\n\tprintf("%.2lf",(double)ans\/2);\n\treturn 0;\n}<\/pre>\n<\/p>\n

\n<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"
Problem 2 \u5708\u5730(land.cpp\/c\/pas) \u3010\u9898\u76ee\u63cf\u8ff0\u3011 2\u7ef4\u5e73\u9762\u4e0a\u6709n\u4e2a\u6728\u6869\uff0c\u4f60\u6709\u4e00\u6b21\u5708\u5730\u7684\u673a […]<\/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":[116],"class_list":["post-365","post","type-post","status-publish","format-standard","hentry","category-defaultcategory","tag-analytic_geometry"],"yoast_head":"\n\u5708\u5730(\u659c\u7387\u6392\u5e8f+\u5750\u6807\u7cfb\u65cb\u8f6c) - 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=365\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5708\u5730(\u659c\u7387\u6392\u5e8f+\u5750\u6807\u7cfb\u65cb\u8f6c) - 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