{"id":180,"date":"2012-09-23T16:04:00","date_gmt":"2012-09-23T08:04:00","guid":{"rendered":"http:\/\/nike0good.jp1.rpvhost.net\/85"},"modified":"2012-09-23T16:04:00","modified_gmt":"2012-09-23T08:04:00","slug":"poj_3844_congruence","status":"publish","type":"post","link":"https:\/\/nike0good.com\/?p=180","title":{"rendered":"POJ 3844(\u540c\u4f59\uff09"},"content":{"rendered":"<p>\u679c\u65ad\u540c\u4f59\u2026\u2026<\/p>\n<p>D[j]-D[i] &nbsp;mod &nbsp;k =0<\/p>\n<p>D[j]=D[i]<\/p>\n<p>\u6c42\u6709\u591a\u5c11\u76f8\u7b49\u6570\u5bf9\uff0c\u7528\u961f\u5217O(n)<\/p>\n<p>\n<\/p>\n<p><pre name=\"code\" class=\"delphi\">Program P3844;\nconst\n   maxn=50000;\n   maxd=1000000;\nvar\n   ans,t,f,n,i,j:longint;\n   d:array[0..maxn] of longint;\nprocedure qsort(l,r:longint);\nvar\n   i,j,m,p:longint;\nbegin\n   i:=l;j:=r;\n   m:=d[(l+r) shr 1];\n   repeat\n      while d[i]&lt;m do inc(i);\n      while d[j]&gt;m do dec(j);\n      if i&lt;=j then\n      begin\n         p:=d[i];\n         d[i]:=d[j];\n         d[j]:=p;\n         inc(i);dec(j);\n      end;\n\n   until i&gt;j;\n   if l&lt;j then qsort(l,j);\n   if i&lt;r then qsort(i,r);\n\nend;\nbegin\n   read(t);\n   d[0]:=0;\n   while (t&gt;0) do\n   begin\n      read(f,n);\n      for i:=1 to n do\n      begin\n         read(d[i]);\n         d[i]:=(d[i]+d[i-1]) mod f;\n      end;\n      qsort(1,n);\n\n      ans:=0;\n      i:=0;j:=0;\n      while (i&lt;=n) do\n      begin\n         while (d[i]=d[j]) and (j&lt;n) do inc(j);\n         if d[i]&lt;&gt;d[j] then dec(j);\n         inc(ans,((j-i+1)*(j-i)) shr 1);\n         i:=j+1;\n         inc(j);\n      end;\n\n\n      writeln(ans);\n\n      dec(t);\n   end;\nend.<\/pre><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u679c\u65ad\u540c\u4f59\u2026\u2026 D[j]-D[i] &nbsp;mod &nbsp;k =0 D[j]=D[i] \u6c42\u6709\u591a\u5c11\u76f8\u7b49\u6570 [&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":[63],"class_list":["post-180","post","type-post","status-publish","format-standard","hentry","category-defaultcategory","tag-congruence"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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