{"id":148,"date":"2020-11-19T04:43:00","date_gmt":"2020-11-19T04:43:00","guid":{"rendered":"https:\/\/imwarming.com\/?p=148"},"modified":"2020-11-19T04:43:00","modified_gmt":"2020-11-19T04:43:00","slug":"bfs%e4%b8%8edfs%e5%9f%ba%e7%a1%80","status":"publish","type":"post","link":"https:\/\/imwarming.com\/?p=148","title":{"rendered":"bfs\u4e0edfs\u57fa\u7840"},"content":{"rendered":"

bfs\u50cf\u4e8c\u53c9\u6811\u7684\u5c42\u5e8f\u904d\u5386<\/p>\n

\"\"<\/p>\n

\u50cf\u8fd9\u4e2a\u56fe\u8d70bfs\u5c31{1\uff0c 2\uff0c 3\uff0c 4\uff0c 5\uff0c 6\uff0c 7\uff0c 8}\u8fd9\u6837\u8d70\uff1b<\/p>\n

dfs\u5c31{1\uff0c 2\uff0c 5\uff0c 6\uff0c 3\uff0c 7\uff0c 8\uff0c 4}\u3002<\/p>\n

bfs\u4e0equeue\u76f8\u7ed3\u5408\uff0c\u8d70\u5230\u54ea\u5c31\u628a\u54ea\u52a0\u8fdbqueue\uff0c\u51fa\u65f6\u628a\u6700\u5148\u8fdb\u7684\u90a3\u4e2a\u70b9\u5f39\u51fa\uff0c\u540c\u65f6\u628a\u5f39\u51fa\u8fd9\u4e2a\u70b9\u6709\u5173\u8fde\u7684\u70b9\u52a0\u5165queue\u3002<\/p>\n

\u4f8b\uff1aluogup5318<\/a> dfs\u4e0ebfs\u8fd0\u7528<\/p>\n

\n
#include<bits\/stdc++.h>\nusing<\/span> namespace<\/span> std;\ntypedef <\/span>long<\/span> long<\/span> ll;\n<\/span>const<\/span> int<\/span> maxn = 1e5 + 5<\/span>;\nll n, m, k, q, p;\n<\/span>string<\/span> s, r;\nvector<\/span><int<\/span>>a[maxn];\/\/<\/span>\u5b58\u8be5\u70b9\u53ef\u4ee5\u8d70\u5411\u54ea\u4e9b\u70b9\uff0cvector\u7b2c\u4e8c\u7ef4\u53ef\u4ee5\u4e00\u76f4\u5b58\u70b9<\/span>\nint<\/span> b[maxn];\/\/<\/span>\u7528\u6765\u5224\u65ad\u8be5\u70b9\u6709\u6728\u6709\u7ecf\u8fc7<\/span>\n\nvoid<\/span> dfs(int<\/span> x){\n    <\/span>if<\/span>(x >= 1<\/span> && x <= n){\/\/<\/span>\u7ecf\u8fc7\u5c31\u8f93\u51fa\u548c\u6807\u8bb0<\/span>\n        b[x] = 1<\/span>;\n        cout<\/span><<x<<'<\/span> '<\/span>;\n    }\n    <\/span>for<\/span>(int<\/span> i = 0<\/span>; i < a[x].size(); i++){\n        <\/span>if<\/span>(!b[a[x][i]])\/\/<\/span>\u628a\u6ca1\u7ecf\u8fc7\u7684\u70b9dfs\u904d\u5386\u4e00\u904d<\/span>\n            dfs(a[x][i]);\n    }\n    <\/span>return<\/span>;\n}\n\n<\/span>void<\/span> bfs(){\n    queue<\/span><int<\/span>>q;\/\/<\/span>\u961f\u5217\u5b58\u70b9<\/span>\n    q.push(1<\/span>);\/\/<\/span>\u70b91\u5148\u8fdb<\/span>\n    while<\/span>(!q.empty()){\/\/<\/span>\u5224\u65ad\u7a7a\u5426<\/span>\n        int<\/span> p = q.front();\n        <\/span>if<\/span>(b[p] == 0<\/span>){\/\/<\/span>\u961f\u9996\u672a\u7ecf\u5386\u5c31\u8f93\u51fa<\/span>\n            b[p] = 1<\/span>;\/\/<\/span>\u6807\u8bb0<\/span>\n            cout<<p<<'<\/span> '<\/span>;\n        }\n        <\/span>else<\/span>{\/\/<\/span>\u7ecf\u5386\u8fc7\u76f4\u63a5\u5f39\u51fa\u5230\u4e0b\u4e00\u6b21\u5faa\u73af<\/span>\n            q.pop();\n            <\/span>continue<\/span>;\n        }\n        <\/span>for<\/span>(int<\/span> i = 0<\/span>; i < a[p].size(); i++){\n            <\/span>if<\/span>(!b[a[p][i]])\/\/<\/span>\u628a\u70b9p\u53ef\u4ee5\u8d70\u5411\u7684\u70b9\u52a0\u5165queue<\/span>\n                q.push(a[p][i]);\n        }\n        q.pop();<\/span>\/\/<\/span>\u4e0d\u8981\u4e86\u5f39\u51fa<\/span>\n    }\n}\n\n<\/span>int<\/span> main(){\n    <\/span>\/\/<\/span>ios_base::sync_with_stdio(0);\n    <\/span>\/\/<\/span>cin.tie(); cout.tie();<\/span>\n    cin>>n>>m;\n    <\/span>for<\/span>(int<\/span> i = 1<\/span>; i <= m; i++){\n        cin<\/span>>>p>>q;\n        a[p].push_back(q);<\/span>\/\/<\/span>\u70b9p\u53ef\u4ee5\u8d70\u5411q<\/span>\n    }\n    <\/span>for<\/span>(int<\/span> i = 1<\/span>; i <= n; i++){\n        sort(a[i].begin(), a[i].end());<\/span>\/\/<\/span>\u4f9d\u9898\u610f\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\uff0c\u5982\u679c\u5927\u5230\u5c0f\u81ea\u5df1\u5199\u4e2acmp\u51fd\u6570<\/span>\n    }\n    dfs(<\/span>1<\/span>);\/\/<\/span>\u4ece1\u5f00\u59cb<\/span>\n    memset(b, 0<\/span>, sizeof<\/span>(b));\/\/<\/span>b\u6570\u7ec4\u5f52\u96f6\u7528\u4e8ebfs<\/span>\n    cout<<endl;\n    bfs();\n    <\/span>return<\/span> 0<\/span>;\n}<\/span><\/pre>\n<\/div>\n
\u4f8b\uff1aluogup3916<\/a> \u53cd\u5411\u5efa\u8fb9\u7684dfs<\/p>\n
\n
#include<bits\/stdc++.h>\nusing<\/span> namespace<\/span> std;\ntypedef <\/span>long<\/span> long<\/span> ll;\n<\/span>const<\/span> int<\/span> maxn = 1e5 + 5<\/span>;\nll n, m, k, q, p;\n<\/span>string<\/span> s, r;\nvector<\/span><int<\/span>>a[maxn];\n<\/span>int<\/span> b[maxn], c[maxn];\/\/<\/span>b\u6807\u8bb0\uff0cc\u5b58\u5230\u8fbe\u6700\u5927\u503c<\/span>\n\nvoid<\/span> dfs(int<\/span> x){\n    <\/span>for<\/span>(int<\/span> i = 0<\/span>; i < a[x].size(); i++){\/\/<\/span>a[x].size()\u662f\u53ef\u4ee5\u5230x\u70b9\u7684\u6570<\/span>\n        if<\/span>(b[a[x][i]] == 0<\/span>){\/\/<\/span>\u770b\u770b\u662f\u5426\u6807\u8bb0<\/span>\n            b[a[x][i]] = 1<\/span>;\/\/<\/span>\u73b0\u5728\u7ecf\u5386\u4e86\u8981\u6807\u8bb0<\/span>\n            c[a[x][i]] = c[x];\/\/<\/span>c[x]\u662fx\u80fd\u5230\u8fbe\u7684\u6700\u5927\u503c\uff0c\u800ca[x][i]\u80fd\u5230x\uff0c\u6240\u4ee5\u5b83\u5230\u6700\u5927\u503c\u4e5f\u662fx\u80fd\u5230\u6700\u5927\u503c<\/span>\n            dfs(a[x][i]);\/\/<\/span>\u7ee7\u7eed\u6df1\u641c\u53ef\u4ee5\u5230a[x][i]\u7684\u70b9<\/span>\n        }\n    }\n}\n\n<\/span>int<\/span> main(){\n    <\/span>\/\/<\/span>ios_base::sync_with_stdio(0);\n    <\/span>\/\/<\/span>cin.tie(); cout.tie();<\/span>\n    cin>>n>>m;\n    <\/span>for<\/span>(int<\/span> i = 1<\/span>; i <= m; i++){\n        cin<\/span>>>p>>q;\n        a[q].push_back(p);<\/span>\/\/<\/span>\u53cd\u5411\u5efa\u8fb9\uff0ca[q]\u91cc\u4e3a\u80fd\u5230\u8fbeq\u7684\u70b9<\/span>\n    }\n    <\/span>for<\/span>(int<\/span> i = n; i >= 1<\/span>; i--){\/\/<\/span>\u56e0\u4e3a\u6c42\u5230\u8fbe\u6700\u5927\uff0c\u4ecen\u5012\u7740\u5faa\u73af\u5c31\u884c<\/span>\n        if<\/span>(b[i] == 0<\/span>){\/\/<\/span>\u770b\u770b\u662f\u5426\u7ecf\u5386<\/span>\n            b[i] = 1<\/span>;\/\/<\/span>\u73b0\u5728\u8981\u7ecf\u5386\u4e86\u6807\u8bb0<\/span>\n            c[i] = i;\/\/<\/span>\u81ea\u5df1\u5230\u81ea\u5df1\u6700\u5927<\/span>\n            dfs(i);\/\/<\/span>\u6df1\u5ea6\u641c\u80fd\u5230i\u70b9\u7684\u70b9\u628a\u4ed6\u4eec\u53ef\u4ee5\u5230\u8fbe\u6700\u5927\u503c\u8bbe\u4e3ai<\/span>\n        }\n    }\n    <\/span>for<\/span>(int<\/span> i = 1<\/span>; i <= n; i++)\n        cout<\/span><<c[i]<<'<\/span> '<\/span>;\/\/<\/span>\u8f93\u51fa1\u5230n\u80fd\u5230\u7684\u6700\u5927\u70b9<\/span>\n    return<\/span> 0<\/span>;\n}<\/span><\/pre>\n<\/div>\n
\u5f85\u7eed…<\/p>\n","protected":false},"excerpt":{"rendered":"
bfs\u50cf\u4e8c\u53c9\u6811\u7684\u5c42\u5e8f\u904d\u5386 \u50cf\u8fd9\u4e2a\u56fe\u8d70bfs\u5c31{1\uff0c 2\uff0c 3\uff0c 4\uff0c 5\uff0c 6\uff0c 7\uff0c 8}\u8fd9\u6837\u8d70\uff1b […]<\/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-148","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nbfs\u4e0edfs\u57fa\u7840 - imwarming<\/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:\/\/imwarming.com\/?p=148\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"bfs\u4e0edfs\u57fa\u7840 - imwarming\" \/>\n<meta property=\"og:description\" content=\"bfs\u50cf\u4e8c\u53c9\u6811\u7684\u5c42\u5e8f\u904d\u5386 \u50cf\u8fd9\u4e2a\u56fe\u8d70bfs\u5c31{1\uff0c 2\uff0c 3\uff0c 4\uff0c 5\uff0c 6\uff0c 7\uff0c 8}\u8fd9\u6837\u8d70\uff1b […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/imwarming.com\/?p=148\" \/>\n<meta property=\"og:site_name\" content=\"imwarming\" \/>\n<meta property=\"article:published_time\" content=\"2020-11-19T04:43:00+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cdn.luogu.com.cn\/upload\/image_hosting\/f4n4tlhi.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"warming\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/imwarming.com\/#website\",\"url\":\"https:\/\/imwarming.com\/\",\"name\":\"imwarming\",\"description\":\"\u6c38\u8fdc\u5e74\u8f7b\uff0c\u6c38\u8fdc\u70ed\u6cea\u76c8\u7736\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/imwarming.com\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/imwarming.com\/?p=148#primaryimage\",\"inLanguage\":\"zh-Hans\",\"url\":\"https:\/\/cdn.luogu.com.cn\/upload\/image_hosting\/f4n4tlhi.png\",\"contentUrl\":\"https:\/\/cdn.luogu.com.cn\/upload\/image_hosting\/f4n4tlhi.png\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/imwarming.com\/?p=148#webpage\",\"url\":\"https:\/\/imwarming.com\/?p=148\",\"name\":\"bfs\u4e0edfs\u57fa\u7840 - 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