{"id":378,"date":"2013-03-31T17:42:00","date_gmt":"2013-03-31T09:42:00","guid":{"rendered":"http:\/\/nike0good.jp1.rpvhost.net\/282"},"modified":"2013-03-31T17:42:00","modified_gmt":"2013-03-31T09:42:00","slug":"poj_2362_square-search_pruning_-_the_relative_order","status":"publish","type":"post","link":"https:\/\/nike0good.com\/?p=378","title":{"rendered":"POJ 2362(Square-\u641c\u7d22\u526a\u679d1-\u76f8\u5bf9\u987a\u5e8f)"},"content":{"rendered":"<table border=\"0\" width=\"100%\" background=\"http:\/\/poj.org\/images\/table_back.jpg\" style=\"font-family:\u5b8b\u4f53\">\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\">\nSquare<\/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;17066<\/td>\n<td width=\"10px\">&nbsp;<\/td>\n<td><strong>Accepted:<\/strong>&nbsp;5878<\/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\">\nGiven a set of sticks of various lengths, is it possible to join them end-to-end to form a square?<\/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\">\nThe first line of input contains N, the number of test cases. Each test case begins with an integer 4 &lt;= M &lt;= 20, the number of sticks. M integers follow; each gives the length of a stick - an integer between 1 and 10,000.<\/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\">\nFor each case, output a line containing &quot;yes&quot; if is is possible to form a square; otherwise output &quot;no&quot;.<\/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\">3\n4 1 1 1 1\n5 10 20 30 40 50\n8 1 7 2 6 4 4 3 5\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\">yes\nno\nyes\n<\/pre>\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=Waterloo+local+2002.09.21\" style=\"text-decoration:initial\">Waterloo local 2002.09.21<\/a><\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\n<\/p>\n<p><span style=\"font-size:14px\">\u300a\u641c\u7d22\u662f\u600e\u6837\u526a\u679d\u7684-1\u300b<\/span><\/p>\n<p><span style=\"font-size:14px\">1.\u53ea\u8981\u627e\u52303\u6761\u8fb9\u3002<\/span><\/p>\n<p><span style=\"font-size:14px\">2.\u4ece\u5927\u5230\u5c0f\u987a\u5e8f\u627e\u3002<\/span><\/p>\n<p><span style=\"font-size:14px\">3.\u6bcf\u6b21\u641c\u8fb9\u65f6\u8981\u786e\u5b9a\u8fb9\u7684\u76f8\u5bf9\u987a\u5e8f\u552f\u4e00\uff08\u76f4\u63a5\u4eceTLE\u2192\u79d2\uff09<\/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;algorithm&gt;\n#include&lt;functional&gt;\n#include&lt;cstring&gt;\n#include&lt;iostream&gt;\nusing namespace std;\n#define MAXM (20+10)\nint tt,n,a[MAXM],cnt,len;\nbool b[MAXM],flag;\nbool dfs(int l,int x,int pre)\n{\n\/\/\tcout&lt;&lt;l&lt;&lt;' '&lt;&lt;x&lt;&lt;' '&lt;&lt;kth&lt;&lt;endl;\n\tif (x==len) {l++;x=0;pre=n-1;}\n\tif (l==4)\n\t{\n\t\treturn 1;\n\t}\n\tfor(int i=pre-1;i;i--)\n\t\tif (!b[i]&amp;&amp;x+a[i]&lt;=len)\n\t\t{\n\t\t\tb[i]=1;\n\t\t\tif (dfs(l,x+a[i],i)) return 1;\n\t\t\tb[i]=0;\n\t\t\/\/\tif (!x) return 0;\n\t\t}\n\treturn 0;\n}\nint main()\n{\n\tscanf(&quot;%d&quot;,&amp;tt);\n\twhile (tt--)\n\t{\n\t\tcnt=0;\n\t\tscanf(&quot;%d&quot;,&amp;n);\n\t\tfor (int i=1;i&lt;=n;i++)\n\t\t{\n\t\t\tscanf(&quot;%d&quot;,&amp;a[i]);\n\t\t\tcnt+=a[i];b[i]=0;\n\t\t}\n\t\tsort(a+1,a+1+n);\n\t\tif (n&lt;4||cnt%4||a[n]&gt;cnt\/4)\n\t\t{\n\t\t\tprintf(&quot;non&quot;);continue;\n\t\t}\n\t\tb[n]=1;len=cnt\/4;\n\t\tif (dfs(1,a[n],n))\n\t\t{\n\t\t\tprintf(&quot;yesn&quot;);\n\t\t}\n\t\telse printf(&quot;non&quot;);\n\t}\n\treturn 0;\n}\n<\/pre>\n<\/p>\n<p><span style=\"font-size:14px\"><br \/>\n<\/span><\/p>\n<p><span style=\"font-size:14px; color:#333399; font-family:\u5b8b\u4f53; font-size:14px\"><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Language: Default Square 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":[80],"class_list":["post-378","post","type-post","status-publish","format-standard","hentry","category-defaultcategory","tag-search"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>POJ 2362(Square-\u641c\u7d22\u526a\u679d1-\u76f8\u5bf9\u987a\u5e8f) - 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=378\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"POJ 2362(Square-\u641c\u7d22\u526a\u679d1-\u76f8\u5bf9\u987a\u5e8f) - nike0good\" \/>\n<meta property=\"og:description\" content=\"Language: Default Square Time Limit:&nbsp;3000MS &nbsp; 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