{"id":52,"date":"2011-08-27T07:11:49","date_gmt":"2011-08-27T07:11:49","guid":{"rendered":"http:\/\/sxkdz.0ginr.com\/blog\/?p=52"},"modified":"2011-08-27T09:26:05","modified_gmt":"2011-08-27T09:26:05","slug":"%e5%86%b2%e5%88%banoip2011%e6%a8%a1%e6%8b%9f%e9%a2%98-%ef%bc%88%e4%b8%80%ef%bc%89%e9%a2%98%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/sxkdz.0ginr.com\/blog\/?p=52","title":{"rendered":"\u51b2\u523aNOIp2011\u6a21\u62df\u9898 \uff08\u4e00\uff09\u9898\u89e3"},"content":{"rendered":"<p><strong>\u9898\u76ee\u5728<a href=\"https:\/\/sxkdz.0ginr.com\/blog\/?p=43\">\u8fd9\u91cc<\/a>\u3002<\/strong><\/p>\n<p><strong>\u4e00\u3001\u62a5\u6570<\/strong><\/p>\n<p>\u3010\u89e3\u6790\u3011\u6a21\u62df<\/p>\n<p>\u6b64\u9898\u4e3a\u5b57\u7b26\u4e32\u5904\u7406\uff0c\u6ca1\u6709\u4ec0\u4e48\u6280\u5de7\uff0c\u5b8c\u5168\u8003\u57fa\u672c\u529f\uff0c\u5f97\u5206\u5bb9\u6613\uff0c\u62ff\u6ee1\u5206\u4e00\u5b9a\u8981\u4ed4\u7ec6\uff0c\u53ea\u8981\u7ec6\u5fc3\u5730\u8003\u8651\u6bcf\u4e00\u79cd\u60c5\u51b5\uff0c\u5c31\u53ef\u4ee5AC\u3002<\/p>\n<p><strong>\u4e8c\u3001\u8dd1\u6b65<\/strong><\/p>\n<p>\u3010\u89e3\u6790\u3011\u5173\u952e\u70b9<\/p>\n<p>\u53ef\u4ee5\u4f9d\u6b21\u679a\u4e3e\u9664\u4e861\u70b9\u548cN\u70b9\u5916\u7684\u6bcf\u4e2a\u70b9\uff08\u8bbe\u5f53\u524d\u679a\u4e3e\u70b9\u4e3ai\uff09\uff0c\u7136\u540e\u4ece1\u70b9\u5f00\u59cbDFS\uff0c\u770b\u80fd\u4e0d\u80fd\u4e0d\u7ecf\u8fc7i\u70b9\u5c31\u904d\u5386\u5230N\u70b9\u3002\u5982\u679c\u4e0d\u80fd\uff0c\u90a3i\u5c31\u662f\u5173\u952e\u70b9\u3002\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO\uff08n^2\uff09\u3002<\/p>\n<p><strong>\u4e09\u3001\u88c5\u5907\u8fd0\u8f93<\/strong><\/p>\n<p>\u3010\u89e3\u6790\u3011\u52a8\u6001\u89c4\u52120-1\u80cc\u5305<\/p>\n<p>\u672c\u9898\u4e3a\u52a0\u4e86\u4e00\u4e2a\u9650\u5236\u6761\u4ef6\u76840-1\u80cc\u5305\uff0c\u4f46\u662f\u89e3\u6cd5\u4e0e\u4f20\u7edf\u76840-1\u80cc\u5305\u5b8c\u5168\u4e00\u6837\u3002<\/p>\n<ul>\n<li>\u72b6\u6001\uff1af[i][j][k]\u8868\u793a\u524di\u4ef6\u7269\u54c1\uff0c\u706b\u8f66\u7684\u4f53\u79ef\u4e3aj\u3001\u91cd\u91cf\u4e3ak\u65f6\u7684\u6700\u5927\u706b\u529b\u503c\uff1b<\/li>\n<li>\u72b6\u6001\u8f6c\u79fb\u65b9\u7a0b\uff1af[i][j][k] = max(f[i-1][j-V[i]][k-G[i]]+T[i], f[i][j][k])<\/li>\n<li>\u76ee\u6807\u72b6\u6001\uff1af[n][v][g]<\/li>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(n*v*g)<\/li>\n<\/ul>\n<p>\u7531\u4e8e\u524di\u4ef6\u7269\u54c1\u53ea\u4e0ei-1\u4ef6\u7269\u54c1\u6709\u5173\uff0c\u4e8e\u662f\u53ef\u4ee5\u964d\u4e3a\u4e8c\u7ef4\u3002<\/p>\n<p>\u3010\u53c2\u8003\u4ee3\u7801\u3011<br \/>\n[cpp]<\/p>\n<p>#include &lt;cstdio&gt;<br \/>\nFILE *fin, *fout;<br \/>\nint V, G, n, max=0;<br \/>\nint f[401][401], t[401], v[401], g[401];<br \/>\nint main(void)<br \/>\n{<br \/>\n\u00a0\u00a0\u00a0 fin = fopen(&#8220;transport.in&#8221;, &#8220;r&#8221;);<br \/>\n\u00a0\u00a0\u00a0 fout = fopen(&#8220;transport.out&#8221;, &#8220;w&#8221;);<\/p>\n<p>\u00a0\u00a0\u00a0 fscanf(fin, &#8220;%d%d%d&#8221;, &amp;V, &amp;G, &amp;n);<br \/>\n\u00a0\u00a0\u00a0 for (int i=1; i&lt;=n; ++i)<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 fscanf(fin, &#8220;%d%d%d&#8221;, &amp;t[i], &amp;v[i], &amp;g[i]);<br \/>\n\u00a0\u00a0\u00a0 for (int i=1; i&lt;=n; ++i)<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 for (int j=V; j&gt;=v[i]; &#8211;j)<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 for (int k=G; k&gt;=g[i]; &#8211;k)<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if (f[j][k]&lt;f[j-v[i]][k-g[i]]+t[i])<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 f[j][k]=f[j-v[i]][k-g[i]]+t[i];<\/p>\n<p>\u00a0\u00a0\u00a0 fprintf(fout, &#8220;%d\\n&#8221;, f[V][G]);<\/p>\n<p>\u00a0\u00a0\u00a0 return 0;<br \/>\n}[\/cpp]<\/p>\n<p>\u3010\u7ec3\u4e60\u9898\u3011<a href=\"https:\/\/sxkdz.0ginr.com\/blog\/?p=59\">\u6f5c\u6c34<\/a><\/p>\n<p><strong>\u56db\u3001\u7ffb\u8f6c\u6e38\u620f<\/strong><\/p>\n<p>\u3010\u89e3\u6790\u3011\u4f4d\u8fd0\u7b97\uff0c\u5e7f\u5ea6\u4f18\u5148\u641c\u7d22\uff08BFS\uff09<\/p>\n<p>\u4f8b\uff1a<\/p>\n<p>bwbw<br \/>\nwwww<br \/>\nbbwb<br \/>\nbwwb<\/p>\n<p>\u6309\u8f93\u5165\u987a\u5e8f\uff08\u4ece0\u523015\uff09\uff0c\u6211\u4eec\u628a\u8fd9\u4e2a\u72b6\u6001\u8f6c\u6362\u4e3a<a href=\"https:\/\/sxkdz.0ginr.com\/blog\/wp-content\/uploads\/2011\/08\/P3.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-64\" title=\"P\" src=\"https:\/\/sxkdz.0ginr.com\/blog\/wp-content\/uploads\/2011\/08\/P3.jpg\" alt=\"\" width=\"405\" height=\"70\" \/><\/a><\/p>\n<p>\u6570\u7ec4num[i]\u7684\u503c\u4e3a2^i\uff08i=0,1\u202615\uff09\uff0c\u5bf9\u4e8e\u8f93\u5165\u8fc7\u7a0b\u4e2d\u7684\u6bcf\u4e00\u4e2a\u201cb\u201d\uff0c\u6211\u4eec\u901a\u8fc7\u6309\u4f4d\u6216\u8fd0\u7b97\uff0c\u53ef\u4ee5\u628a\u4e0a\u9762\u7684\u4e8c\u8fdb\u5236\u8868\u793a\u7684\u72b6\u60011001101100000101\uff0c\u8f6c\u6362\u621010\u8fdb\u5236\u72b6\u600139685\u3002\u5bf9\u6bcf\u4e00\u4e2a\u72b6\u6001\uff0c\u6211\u4eec\u53ef\u4f9d\u6b21\u9009\u62e9\u7b2c0\u5230\u7b2c15\u4e2a\u4f4d\u7f6e\u8fdb\u884c\u7ffb\u8f6c\u5c1d\u8bd5\u3002\u5bf9\u4f4d\u7f6ei\u53ef\u4ee5\u901a\u8fc7i\/4\u53d6\u5f97\u5b83\u5728\u68cb\u76d8\u4e2d\u6240\u5728\u7684\u884c\u53f7\uff0c\u53ef\u4ee5\u901a\u8fc7i%4\u53d6\u5f97\u5b83\u5728\u68cb\u76d8\u4e2d\u6240\u5728\u7684\u5217\u53f7\u3002\u7136\u540e\u518d\u901a\u8fc7\u5faa\u73af\u6539\u53d8\u5b83\u76f8\u90bb\u4f4d\u7f6e\u7269\u4ef6\uff0c\u6b64\u5904\u901a\u8fc7\u5f02\u6216\u8fd0\u7b97\u6c42\u51fa\u9009\u62e9\u5728\u8be5\u4f4d\u7f6e\u7ffb\u8f6c\u65f6\u5f97\u5230\u7684\u72b6\u6001\uff0c\u5224\u65ad\u8fd9\u4e2a\u72b6\u6001\u662f\u4e0d\u662f\u51fa\u73b0\u8fc7\uff0c\u6ca1\u51fa\u73b0\u8fc7\u5c31\u5165\u961f\uff0c\u505a\u76f8\u5e94\u7684\u6807\u8bb0\u3002\u76f4\u5230\u51fa\u73b0\u76ee\u6807\u72b6\u6001\u5373\u53ef\u9000\u51fa\u641c\u7d22\uff0c\u6216\u8005\u961f\u5217\u4e3a\u7a7a\u65f6\u65e0\u89e3\u3002\u6b64\u9898\u4e2d\u7528\u5230\u4e86\u6309\u4f4d\u6216\u8fd0\u7b97\uff08|\uff09\u3001\u6309\u4f4d\u5f02\u6216\u8fd0\u7b97\uff08^\uff09\u53ca\u5de6\u79fb\u8fd0\u7b97\uff08&lt;&lt;\uff09\u3002<\/p>\n<p>\u3010\u53c2\u8003\u4ee3\u7801\u3011<\/p>\n<p>[cpp]<br \/>\n#include &lt;cstdio&gt;<br \/>\nconst int flip[]= {51200, 58368, 29184, 12544, 35968, 20032, 10016,<br \/>\n4880, 2248, 1252, 626, 305, 140, 78, 39, 19};<br \/>\nint map[70000], step[70000], h=0, t=1;<br \/>\nbool hash[70000];<br \/>\nint main(void)<br \/>\n{<br \/>\n\u00a0\u00a0\u00a0 for (int i=1; i&lt;=4; ++i, getchar())<br \/>\n\u00a0\u00a0\u00a0 {<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 char t[4];<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 scanf(&#8220;%s&#8221;, t);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 for (int j=0; j&lt;4; ++j)<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 map[1]&lt;&lt;=1;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if (t[j]==&#8217;b&#8217;)<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ++map[1];<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<br \/>\n\u00a0\u00a0\u00a0 }<br \/>\n\u00a0\u00a0\u00a0 hash[map[1]]=true;<br \/>\n\u00a0\u00a0\u00a0 if (map[1]==0 || map[1]==(1&lt;&lt;16)-1)<br \/>\n\u00a0\u00a0\u00a0 {<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 printf(&#8220;0\\n&#8221;);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 return 0;<br \/>\n\u00a0\u00a0\u00a0 }<br \/>\n\u00a0\u00a0\u00a0 while (h&lt;t)<br \/>\n\u00a0\u00a0\u00a0 {<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ++h;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 for (int i=0; i&lt;=15; ++i)<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 int des = map[h]^flip[i];<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if (hash[des])<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 continue;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 else<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 hash[des]=true, map[++t]=des, step[t]=step[h]+1;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 if (des==0 || des==(1&lt;&lt;16)-1)<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 {<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 printf(&#8220;%d\\n&#8221;, step[t]);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 return 0;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }<br \/>\n\u00a0\u00a0\u00a0 }<br \/>\n\u00a0\u00a0\u00a0 printf(&#8220;Impossible\\n&#8221;);<br \/>\n\u00a0\u00a0\u00a0 return 0;<br \/>\n}[\/cpp]<\/p>\n<p>\u3010\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u672c\u6587\u51fa\u5904\uff0c\u8c22\u8c22\u3011<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9898\u76ee\u5728\u8fd9\u91cc\u3002 \u4e00\u3001\u62a5\u6570 \u3010\u89e3\u6790\u3011\u6a21\u62df \u6b64\u9898\u4e3a\u5b57\u7b26\u4e32\u5904\u7406\uff0c\u6ca1\u6709\u4ec0\u4e48\u6280\u5de7\uff0c\u5b8c\u5168\u8003\u57fa\u672c\u529f\uff0c\u5f97\u5206\u5bb9\u6613\uff0c\u62ff\u6ee1\u5206\u4e00\u5b9a\u8981\u4ed4\u7ec6\uff0c\u53ea\u8981\u7ec6\u5fc3\u5730\u8003\u8651\u6bcf\u4e00\u79cd\u60c5\u51b5\uff0c\u5c31\u53ef\u4ee5AC\u3002 \u4e8c\u3001\u8dd1\u6b65 \u3010\u89e3\u6790\u3011\u5173\u952e\u70b9 \u53ef\u4ee5\u4f9d\u6b21\u679a\u4e3e\u9664\u4e861\u70b9\u548cN\u70b9\u5916\u7684\u6bcf\u4e2a\u70b9\uff08\u8bbe\u5f53\u524d\u679a\u4e3e\u70b9\u4e3ai\uff09\uff0c\u7136\u540e\u4ece1\u70b9\u5f00\u59cbDFS\uff0c\u770b\u80fd\u4e0d\u80fd\u4e0d\u7ecf\u8fc7i\u70b9\u5c31\u904d\u5386\u5230N\u70b9\u3002\u5982\u679c\u4e0d\u80fd\uff0c\u90a3i\u5c31\u662f\u5173\u952e\u70b9\u3002\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO\uff08n^2\uff09\u3002 \u4e09\u3001\u88c5\u5907\u8fd0\u8f93 \u3010\u89e3\u6790\u3011\u52a8\u6001\u89c4\u52120-1\u80cc\u5305 \u672c\u9898\u4e3a\u52a0\u4e86\u4e00\u4e2a\u9650\u5236\u6761\u4ef6\u76840-1\u80cc\u5305\uff0c\u4f46\u662f\u89e3\u6cd5\u4e0e\u4f20\u7edf\u76840-1\u80cc\u5305\u5b8c\u5168\u4e00\u6837\u3002 \u72b6\u6001\uff1af[i][j][k]\u8868\u793a\u524di\u4ef6\u7269\u54c1\uff0c\u706b\u8f66\u7684\u4f53\u79ef\u4e3aj\u3001\u91cd\u91cf\u4e3ak\u65f6\u7684\u6700\u5927\u706b\u529b\u503c\uff1b \u72b6\u6001\u8f6c\u79fb\u65b9\u7a0b\uff1af[i][j][k] = max(f[i-1][j-V[i]][k-G[i]]+T[i], f[i][j][k]) \u76ee\u6807\u72b6\u6001\uff1af[n][v][g] \u65f6\u95f4\u590d\u6742\u5ea6\uff1aO(n*v*g) \u7531\u4e8e\u524di\u4ef6\u7269\u54c1\u53ea\u4e0ei-1\u4ef6\u7269\u54c1\u6709\u5173\uff0c\u4e8e\u662f\u53ef\u4ee5\u964d\u4e3a\u4e8c\u7ef4\u3002 \u3010\u53c2\u8003\u4ee3\u7801\u3011 [cpp] #include &lt;cstdio&gt; FILE *fin, *fout; int V, G, n, max=0; int f[401][401], t[401], v[401], g[401]; int main(void) { \u00a0\u00a0\u00a0 fin = fopen(&#8220;transport.in&#8221;, &#8220;r&#8221;); \u00a0\u00a0\u00a0 fout = fopen(&#8220;transport.out&#8221;, &#8220;w&#8221;); \u00a0\u00a0\u00a0 fscanf(fin, &#8220;%d%d%d&#8221;, &amp;V, &amp;G, &amp;n); \u00a0\u00a0\u00a0 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[5],"class_list":["post-52","post","type-post","status-publish","format-standard","hentry","category-3","tag-5"],"_links":{"self":[{"href":"https:\/\/sxkdz.0ginr.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/52","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sxkdz.0ginr.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sxkdz.0ginr.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sxkdz.0ginr.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sxkdz.0ginr.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=52"}],"version-history":[{"count":12,"href":"https:\/\/sxkdz.0ginr.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/52\/revisions"}],"predecessor-version":[{"id":87,"href":"https:\/\/sxkdz.0ginr.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/52\/revisions\/87"}],"wp:attachment":[{"href":"https:\/\/sxkdz.0ginr.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=52"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sxkdz.0ginr.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=52"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sxkdz.0ginr.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=52"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}