{"id":297,"date":"2012-12-09T22:21:00","date_gmt":"2012-12-09T14:21:00","guid":{"rendered":"http:\/\/nike0good.jp1.rpvhost.net\/202"},"modified":"2012-12-09T22:21:00","modified_gmt":"2012-12-09T14:21:00","slug":"cf_254a_repeated","status":"publish","type":"post","link":"https:\/\/nike0good.com\/?p=297","title":{"rendered":"CF 254A(\u91cd\u590d\u7684\u6570)"},"content":{"rendered":"
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A. \u6570\u5b57\u5361\u7247<\/div>\n
\n
\ntime limit per test<\/div>\n

1 second<\/p><\/div>\n

\n
\nmemory limit per test<\/div>\n

256 megabytes<\/p><\/div>\n

\n
\ninput<\/div>\n

input.txt<\/p><\/div>\n

\n
\noutput<\/div>\n

output.txt<\/p><\/div>\n<\/div>\n

\n

\n\u67092n<\/em><\/span>\u5f20\u5361\u7247\u7f16\u53f7\u4e3a1<\/span> .. 2n<\/em><\/span>.\u5361\u7247\u6570\u5b57\u76f8\u540c\u53ef\u51d1\u6210\u4e00\u5bf9\uff0c\u80fd\u5426\u51d1\u5b8c\uff1f<\/p>\n<\/div>\n

\n
\nInput<\/div>\n

\n\u7b2c\u4e00\u884c1\u4e2a\u6574\u6570n<\/em><\/span> (1\u2009\u2264\u2009n<\/em>\u2009\u2264\u20093\u00b7105<\/sup><\/span>).
\n \u7b2c\u4e8c\u884c\u67092n<\/em><\/span>\u4e2a\u6574\u6570a<\/em>1<\/sub>,\u2009a<\/em>2<\/sub>,\u2009...,\u2009a<\/em>2n<\/em><\/sub><\/span> (1\u2009\u2264\u2009a<\/em>i<\/em><\/sub>\u2009\u2264\u20095000<\/span>)
\n \u8868\u793a\u7b2ci<\/em><\/span>\u5f20\u5361\u7247\u7684\u6570\u5b57\u3002<\/p>\n<\/div>\n

\n
\nOutput<\/div>\n

\n\u5982\u679c\u51d1\u4e0d\u5b8c\uff0c\u8bf7\u8f93\u51fa -1.<\/span>\u5426\u5219\u8f93\u51fa n<\/em><\/span> \u884c\uff0c\u6bcf\u884c\u4e00\u5bf9\u5bf9\u6574\u6570\uff0c\u8868\u793a\u7b2ci\u5f20\u5361\u7247\u4e0e\u7b2cj\u5f20\u51d1\u6210\u4e00\u5bf9\u3002<\/p>\n

\n\u8f93\u51fa\u4efb\u610f\u65b9\u6848\u3002<\/p>\n<\/div>\n

\n
\nSample test(s)<\/div>\n
\n
\n
\ninput<\/div>\n
3\n20 30 10 30 20 10\n<\/pre>\n<\/div>\n
\n
\noutput<\/div>\n
4 2\n1 5\n6 3\n<\/pre>\n<\/div>\n
\n
\ninput<\/div>\n
1\n1 2\n<\/pre>\n<\/div>\n
\n
\noutput<\/div>\n
-1<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\n<\/p>\n
\u76f4\u63a5\u7528\u6570\u7ec4\u8bb0\u5f55\u51fa\u73b0\u6b21\u6570\uff0c\u6bcf\u9047\u5230\u4e00\u5bf9\uff0c\u5c31\u6254\u5165\u89e3\u4e2d\u3002<\/span><\/p>\n
<\/span><\/p>\n
Program Cards;\nconst\n   maxn=300000;\nvar\n   n,i,p,size:longint;\n   a:array[1..5000] of longint;\n   q1,q2:array[1..maxn] of longint;\nbegin\n   assign(input,'input.txt');\n   assign(output,'output.txt');\n   reset(input);\n   rewrite(output);\n\n   read(n);\n   fillchar(a,sizeof(a),0);\n   size:=1;\n   for i:=1 to 2*n do\n   begin\n      read(p);\n      if a[p]>0 then\n      begin\n         q1[size]:=a[p];q2[size]:=i;\n         inc(size);\n         a[p]:=0;\n      end\n      else a[p]:=i;\n   end;\n   if size<>n+1 then writeln('-1')\n   else for i:=1 to n do writeln(q1[i],' ',q2[i]);\n\n   close(input);\n   close(output);\nend.<\/pre><\/p>\n","protected":false},"excerpt":{"rendered":"
A. \u6570\u5b57\u5361\u7247 time limit per test 1 second memory limit per t […]<\/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":[99],"class_list":["post-297","post","type-post","status-publish","format-standard","hentry","category-defaultcategory","tag-simulation"],"yoast_head":"\nCF 254A(\u91cd\u590d\u7684\u6570) - 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=297\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CF 254A(\u91cd\u590d\u7684\u6570) - nike0good\" \/>\n<meta property=\"og:description\" content=\"A. \u6570\u5b57\u5361\u7247 time limit per test 1 second memory limit per t […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/nike0good.com\/?p=297\" \/>\n<meta property=\"og:site_name\" content=\"nike0good\" \/>\n<meta property=\"article:published_time\" content=\"2012-12-09T14:21:00+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=\"1 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=297#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=297\"},\"author\":{\"name\":\"nike0good\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/#\\\/schema\\\/person\\\/4defa38da89de87e400861e73396baad\"},\"headline\":\"CF 254A(\u91cd\u590d\u7684\u6570)\",\"datePublished\":\"2012-12-09T14:21:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=297\"},\"wordCount\":51,\"commentCount\":0,\"keywords\":[\"\u6a21\u62df\"],\"articleSection\":[\"DefaultCategory\"],\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/nike0good.com\\\/?p=297#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=297\",\"url\":\"https:\\\/\\\/nike0good.com\\\/?p=297\",\"name\":\"CF 254A(\u91cd\u590d\u7684\u6570) - 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