{"id":1234,"date":"2015-12-17T01:11:30","date_gmt":"2015-12-16T17:11:30","guid":{"rendered":"http:\/\/www.shuizilong.com\/house\/?p=1234"},"modified":"2015-12-17T01:11:55","modified_gmt":"2015-12-16T17:11:55","slug":"bzoj-1457-%e6%a3%8b%e7%9b%98%e6%b8%b8%e6%88%8f","status":"publish","type":"post","link":"https:\/\/www.shuizilong.com\/house\/archives\/bzoj-1457-%e6%a3%8b%e7%9b%98%e6%b8%b8%e6%88%8f\/","title":{"rendered":"BZOJ 1457. \u68cb\u76d8\u6e38\u620f"},"content":{"rendered":"<p><!--more--><br \/>\n\u5f80\u6a21\u578b\u4e0a\u9760\u3002\u3002<br \/>\n\u666e\u901a NIM \u662f\uff1a\u6240\u6709\u5806\u90fd\u5230\u7ec8\u6001\u4e3a\u8d1f\u3002\u8fd9\u91cc\u662f\uff1a\u4efb\u610f\u4e00\u5806\u79fb\u52a8\u5230\u7ec8\u6001\u4e3a\u80dc\u3002<br \/>\n\u90a3\u4e48\u5728\u65b0\u95ee\u9898\u91cc\uff0c\u6211\u4eec\u8981\u907f\u514d\u8d70\u5230\u4efb\u610f\u4e00\u4e2a\u53ef\u4ee5\u79fb\u52a8\u5230\u7ec8\u6001\u7684\u72b6\u6001\u3002\uff08\u5426\u5219\u4e0b\u4e00\u6b65\u5c31\u8f93\u4e86\uff09<br \/>\n\u6211\u4eec\u5b9a\u4e49\u8fd9\u6837\u7684\u72b6\u6001\u7684 sg=0\uff0c\u540c\u65f6\u907f\u514d\u4ece\u8fd9\u4e9b\u72b6\u6001\u8f6c\u79fb\uff0c\u8fd9\u6837\u5c31\u548c\u666e\u901a\u7684 NIM \u9760\u4e0a\u4e86\u3002<\/p>\n<pre class=\"brush: cpp; light: false; title: ; toolbar: true; notranslate\" title=\"\">\r\n\/\/}\/* .................................................................................................................................. *\/\r\n\r\nconst int N = int(1e2) + 9;\r\n\r\nint sg&#x5B;N]&#x5B;N];\r\n\r\nint mex(set&lt;int&gt;&amp; H){\r\n    REP(i, H.size()+1) if (!CTN(H, i)) return i;\r\n    assert(0);\r\n    return -1;\r\n}\r\n\r\nvoid init(){\r\n    REP_2(i, j, N, N){\r\n        if (!i || !j || i == j) sg&#x5B;i]&#x5B;j] = -1;\r\n        else{\r\n            set&lt;int&gt; H;\r\n            REP_1(k, i) H.insert(sg&#x5B;i-k]&#x5B;j]);\r\n            REP_1(k, j) H.insert(sg&#x5B;i]&#x5B;j-k]);\r\n            REP_1(k, min(i, j)) H.insert(sg&#x5B;i-k]&#x5B;j-k]);\r\n            sg&#x5B;i]&#x5B;j] = mex(H);\r\n        }\r\n    }\r\n}\r\n\r\nbool win(){\r\n    int SG = 0;\r\n    Rush{\r\n        int x, y; RD(x, y); if (!x &amp;&amp; !y) return false;\r\n        if (sg&#x5B;x]&#x5B;y] == -1) return true;\r\n        SG ^= sg&#x5B;x]&#x5B;y];\r\n    }\r\n    return SG;\r\n}\r\n\r\nint main(){\r\n    \r\n#ifndef ONLINE_JUDGE\r\n    freopen(&quot;\/users\/xiaodao\/desktop\/Exercise\/in.txt&quot;, &quot;r&quot;, stdin);\r\n    \/\/freopen(&quot;out.txt&quot;, &quot;w&quot;, stdout);\r\n#endif\r\n    init(); Rush puts(win() ? &quot;^o^&quot; : &quot;T_T&quot;);\r\n}\r\n<\/pre>\n<p>http:\/\/www.lydsy.com\/JudgeOnline\/problem.php?id=1457<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"N3h0sYyH6C\"><p><a href=\"https:\/\/edward-mj.com\/archives\/381\">[\u8861\u9633\u516b\u4e2d1457 \u68cb\u76d8\u6e38\u620f]\u3010\u535a\u5f08\u3011\u3010SG\u51fd\u6570\u3011\u3010NIM\u548c\u3011\u3010\u4efb\u610f\u4e00\u5b50\u6e38\u620f\u5230\u8fbe\u7ec8\u6001\u7ed3\u675f\u7684\u6e38\u620f\u3011<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"\u300a [\u8861\u9633\u516b\u4e2d1457 \u68cb\u76d8\u6e38\u620f]\u3010\u535a\u5f08\u3011\u3010SG\u51fd\u6570\u3011\u3010NIM\u548c\u3011\u3010\u4efb\u610f\u4e00\u5b50\u6e38\u620f\u5230\u8fbe\u7ec8\u6001\u7ed3\u675f\u7684\u6e38\u620f\u3011 \u300b\u2014edward_mj\" src=\"https:\/\/edward-mj.com\/archives\/381\/embed#?secret=fSRTSApQZk#?secret=N3h0sYyH6C\" data-secret=\"N3h0sYyH6C\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[22],"tags":[],"class_list":["post-1234","post","type-post","status-publish","format-standard","hentry","category-bzoj"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p2tdP7-jU","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/1234","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/comments?post=1234"}],"version-history":[{"count":0,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/posts\/1234\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/media?parent=1234"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/categories?post=1234"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.shuizilong.com\/house\/wp-json\/wp\/v2\/tags?post=1234"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}