{"id":210,"date":"2012-10-26T01:56:00","date_gmt":"2012-10-25T17:56:00","guid":{"rendered":"http:\/\/nike0good.jp1.rpvhost.net\/115"},"modified":"2012-10-26T01:56:00","modified_gmt":"2012-10-25T17:56:00","slug":"cf_237c_prime_interval","status":"publish","type":"post","link":"https:\/\/nike0good.com\/?p=210","title":{"rendered":"CF 237C (\u8d28\u6570\u533a\u95f4\uff09"},"content":{"rendered":"<p>\u7ed9\u5b9a\u533a\u95f4[a,b] \u6c42l\u7684\u6700\u5c0f&#20540;\u4f7f[a,b]\u4e2d\u4efb\u610f\u957f\u5ea6\u4e3al\u7684\u4e00\u6bb5\u5305\u542b\u81f3\u5c11k\u4e2aPrime<\/p>\n<p>\u4e8c\u5206l<\/p>\n<p>\n<\/p>\n<p><pre name=\"code\" class=\"cpp\">#include&lt;cstdio&gt;\n#include&lt;cstring&gt;\n#include&lt;cstdlib&gt;\n#include&lt;cmath&gt;\n#include&lt;algorithm&gt;\n#include&lt;functional&gt;\n#include&lt;iostream&gt;\nusing namespace std;\n#define MAXN (1000000+10)\nint a[MAXN],tot=0,x,y,k;\nbool b[MAXN]={0};\nvoid work()\n{\n\tb[1]=1;\n\tfor (int i=2;i&lt;=y;i++)\n\t{\n\t\tif (!b[i])\n\t\t{\n\t\t\ttot++;\n\t\t\ta[tot]=i;\n\t\t}\n\t\tfor (int j=1;j&lt;=tot;j++)\n\t\t{\n\t\t\tif (a[j]*i&gt;y) break;\n\t\t\tb[a[j]*i]=1;\n\t\t\tif (!i%a[j]) break;\n\t\t}\n\t}\n}\nbool is_ok(int l)\n{\n\tint tot=0;\n\tfor (int i=x;i&lt;=x+l-1;i++)\n\t\tif (!b[i]) tot++;\n\tif (tot&lt;k) return false;\n\tfor (int j=x+l;j&lt;=y;j++)\n\t{\n\t\ttot=tot+(!b[j])-(!b[j-l]);\n\t\tif (tot&lt;k) return false;\n\t}\n\treturn true;\n}\n\nint main()\n{\n\tscanf(&quot;%d%d%d&quot;,&amp;x,&amp;y,&amp;k);\n\twork();\n\tint l=k,r=y-x+1;\n\tif (l&gt;r||!is_ok(r))\n\t{\n\t\tprintf(&quot;-1n&quot;);\n\t\treturn 0;\n\t}\n\tfor (int i=1;i&lt;=60;i++)\n\t{\n\t\tif (l==r) break;\n\t\tint m=(l+r)&gt;&gt;1;\n\/\/\t\tif (r-l==1) m++;\n\t\tif (is_ok(m)) r=m;\n\t\telse l=m+1;\n\t}\n\tprintf(&quot;%dn&quot;,l);\n\/\/\twhile (1);\n\treturn 0;\n}<\/pre><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u533a\u95f4[a,b] \u6c42l\u7684\u6700\u5c0f&#20540;\u4f7f[a,b]\u4e2d\u4efb\u610f\u957f\u5ea6\u4e3al\u7684\u4e00\u6bb5\u5305\u542b\u81f3\u5c11k\u4e2aPrime \u4e8c\u5206l  [&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":[55],"class_list":["post-210","post","type-post","status-publish","format-standard","hentry","category-defaultcategory","tag-dichotomy"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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