{"id":88,"date":"2026-01-10T11:11:06","date_gmt":"2026-01-10T03:11:06","guid":{"rendered":"https:\/\/\u9f50\u6cb3\u4e00\u4e2d.cn\/blog\/?p=88"},"modified":"2026-01-10T11:11:06","modified_gmt":"2026-01-10T03:11:06","slug":"spfa%e7%ae%97%e6%b3%95","status":"publish","type":"post","link":"https:\/\/\u9f50\u6cb3\u4e00\u4e2d.cn\/blog\/index.php\/2026\/01\/10\/spfa%e7%ae%97%e6%b3%95\/","title":{"rendered":"SPFA\u7b97\u6cd5"},"content":{"rendered":"\n<p>\u8d1f\u73afP3385: <a href=\"https:\/\/www.luogu.com.cn\/problem\/P3385\">https:\/\/www.luogu.com.cn\/problem\/P3385<\/a><\/p>\n\n\n\n<p>SPFA\u89c6\u9891: <a href=\"https:\/\/www.bilibili.com\/video\/BV19mq4BREGL\/?spm_id_from=333.337.search-card.all.click&amp;vd_source=0d24edb3ad1a435dd9fec2b4bace6d95\">https:\/\/www.bilibili.com\/video\/BV19mq4BREGL<\/a><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u8fd9\u79cd\u4e00\u4e2a\u6d4b\u8bd5\u70b9\u591a\u4e2a\u6d4b\u8bd5\u6570\u636e\u7684\uff0c\u4e00\u5b9a\u8981\u6bcf\u6b21<strong>\u6e05\u7a7a\u6570\u7ec4<\/strong>!<\/p>\n<\/blockquote>\n\n\n\n<pre class=\"wp-block-code\"><code>memset(dis, 0x3f3f3f3f, sizeof(dis));\nmemset(vis, 0, sizeof(vis));\nmemset(inwait, 0 ,sizeof(inwait)); \/\/ \u6e05\u7a7a\u662f\u5426\u5728\u961f\u4e2d\nfor (int k = 1; k &lt;= n; k++) a&#91;k].clear(); \/\/ \u6e05\u7a7a\u90bb\u63a5\u8868\nwhile (!q.empty()) q.pop();  \/\/ \u6e05\u7a7a\u961f\u5217<\/code><\/pre>\n\n\n\n<p class=\"has-text-align-center\">\u6ce8\u610f\uff0c\u5982\u679c\u67d0\u4e2a\u5b9a\u70b9\u5df2\u7ecf\u5728\u961f\u5217\u4e2d\uff0c\u4e0d\u80fd<strong>\u91cd\u590d\u52a0\u5165\u961f\u5217<\/strong>\uff0c\u6240\u4ee5\u8bbe\u5b9a\u4e00\u4e2a\u6570\u7ec4\u5224\u65ad\u9876\u70b9\u662f\u5426\u5728\u961f\u5217\u4e2d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u4e3b\u8981\u7a0b\u5e8f\nwhile (!q.empty()) {\n\tint u = q.front();q.pop();\n\t\t\n\tinwait&#91;u] = 0;\n\tvis&#91;u]++;\n\tif (vis&#91;u] > n) {\n\t\t\/\/ \u4e00\u4e2a\u70b9\u8fde\u7eed\u5165\u961f\u8d85\u8fc7n\u6b21\uff0c\u8bc1\u660e\u5b58\u5728\u8d1f\u73af\n\t\tbreak;\n\t}\n\t\/\/ \u904d\u5386u\u6240\u80fd\u5230\u8fbe\u7684\u70b9\t\n\tfor (auto ed : a&#91;u]) {\n\t\tif (dis&#91;ed.v] > ed.w + dis&#91;u]) {\n\t\t\tdis&#91;ed.v] = ed.w + dis&#91;u];  \/\/ 1\u5230\u8fbe\u4e0a\u4e00\u4e2a\u70b9\u7684\u8ddd\u79bbdis&#91;u]\u52a0\u4e0a\u5f53\u524d\u8fb9\u7684\u6743\u91cded.w\n\t\t\tif (!inwait&#91;ed.v]) { \n\t\t\t\tinwait&#91;ed.v] = 1;\n\t\t\t\tq.push(ed.v);\n\t\t\t}\n\t\t\t\t\t\n\t\t}\n\t\t\t\t\n\t}\n}<\/code><\/pre>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8d1f\u73afP3385: https:&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-88","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/\u9f50\u6cb3\u4e00\u4e2d.cn\/blog\/index.php\/wp-json\/wp\/v2\/posts\/88","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/\u9f50\u6cb3\u4e00\u4e2d.cn\/blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/\u9f50\u6cb3\u4e00\u4e2d.cn\/blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/\u9f50\u6cb3\u4e00\u4e2d.cn\/blog\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/\u9f50\u6cb3\u4e00\u4e2d.cn\/blog\/index.php\/wp-json\/wp\/v2\/comments?post=88"}],"version-history":[{"count":3,"href":"https:\/\/\u9f50\u6cb3\u4e00\u4e2d.cn\/blog\/index.php\/wp-json\/wp\/v2\/posts\/88\/revisions"}],"predecessor-version":[{"id":91,"href":"https:\/\/\u9f50\u6cb3\u4e00\u4e2d.cn\/blog\/index.php\/wp-json\/wp\/v2\/posts\/88\/revisions\/91"}],"wp:attachment":[{"href":"https:\/\/\u9f50\u6cb3\u4e00\u4e2d.cn\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=88"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/\u9f50\u6cb3\u4e00\u4e2d.cn\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=88"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/\u9f50\u6cb3\u4e00\u4e2d.cn\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=88"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}