{"id":162,"date":"2025-01-12T13:01:02","date_gmt":"2025-01-12T05:01:02","guid":{"rendered":"http:\/\/150.230.63.147\/blog\/?p=162"},"modified":"2025-01-12T13:01:02","modified_gmt":"2025-01-12T05:01:02","slug":"e-directing-edges-%e8%a7%a3%e6%9e%90%e6%80%9d%e7%b6%ad%e3%80%81%e6%8b%93%e6%a8%b8%e6%8e%92%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/blog.seekrealthing.net\/blog\/?p=162","title":{"rendered":"E. Directing Edges \u89e3\u6790(\u601d\u7dad\u3001\u62d3\u6a38\u6392\u5e8f)"},"content":{"rendered":"\n

Codeforce 1385 E. Directing Edges \u89e3\u6790(\u601d\u7dad\u3001\u62d3\u6a38\u6392\u5e8f)<\/h1>\n

\u4eca\u5929\u6211\u5011\u4f86\u770b\u770bCF1385E
\n\u984c\u76ee\u9023\u7d50<\/a><\/p>\n

\n

\u984c\u76ee<\/strong>
\n\u7d66\u4e00\u5f35\u5716\uff0c\u5176\u4e2d\u6709\u4e9b\u908a\u4e00\u958b\u59cb\u5c31\u662f\u6709\u5411\u908a\uff0c\u6709\u4e9b\u908a\u4e00\u958b\u59cb\u6c92\u7d66\u5b9a\u65b9\u5411\u3002\u6c42\u662f\u5426\u53ef\u80fd\u6709\u4e00\u7a2e\u908a\u7684\u65b9\u5411\u6307\u5b9a\uff0c\u80fd\u5920\u8b93\u6574\u5f35\u5716\u8b8a\u6210\u6709\u5411\u7121\u74b0\u5716\u3002<\/p>\n<\/blockquote>\n

\u524d\u8a00<\/h3>\n

\u5b8c\u5168\u4e0d\u6703\u2026<\/p>\n

\u60f3\u6cd5<\/h3>\n

\u9996\u5148\u5148\u53ea\u628a\u56fa\u5b9a\u597d\u65b9\u5411\u7684\u908a\u653e\u5230\u5716\u4e0a\uff0c\u4e26\u4e14\u8dd1\u4e00\u904d\u62d3\u6a38\u6392\u5e8f\uff0c\u6211\u662f\u4f7f\u7528\u6bcf\u6b21\u8655\u7406\u5165\u5ea6\u70ba\u96f6\u7684\u9ede\u7684\u65b9\u6cd5\uff0c\u4e26\u4e14\u7528queue\u8655\u7406\u4e0b\u4e00\u500b\u8981\u770b\u7684\u9ede\u7684\u65b9\u6cd5\u3002
\n\u6ce8\u610f\u5230\uff0c\u9019\u500b\u65b9\u6cd5\u8655\u7406\u7684\u9ede\u7684\u9806\u5e8f\u662f(\u5982\u679c\u8655\u7406\u7684\u5716\u662f\u6709\u5411\u7121\u74b0\u5716)\uff0c\u6703\u662f\u6df1\u5ea6\u70ba0\u7684\u9ede\u5148\u88ab\u8655\u7406\u5b8c\uff0c\u7136\u5f8c\u624d\u6703\u662f\u6df1\u5ea6\u70ba1\u7684\u9ede\u3002\u3002\u3002
\n\u5982\u6b64\u4e00\u4f86\uff0c\u6211\u5011\u7d00\u9304\u6bcf\u500b\u9ede\u88ab\u8655\u7406\u7684\u9806\u5e8f\u3002\u5982\u679c\u767c\u73fe\u6700\u5f8c\u7e3d\u7de8\u865f\u5c0f\u65bc$n$\uff0c\u4ee3\u8868\u5716\u4e2d\u6709\u74b0\uff0c\u6240\u4ee5\u5230\u67d0\u6b65\u4ee5\u5f8c\u7a0b\u5f0f\u627e\u4e0d\u5230\u5165\u5ea6\u70ba0\u7684\u9ede\uff0c\u6211\u5011\u5373\u53ef\u8f38\u51faNO\u3002
\n\u90a3\u9ebc\u63a5\u4e0b\u4f86\u6211\u5011\u8003\u616e\u672a\u5b9a\u5411\u7684\u908a\uff0c\u89c0\u5bdf\u5230\uff0c\u53ea\u8981\u5c07\u908a\u5f9e\u7de8\u865f\u5c0f\u7684\u9ede\u9023\u5230\u7de8\u865f\u5927\u7684\uff0c\u5c31\u4e00\u5b9a\u4e0d\u6703\u6709\u74b0\uff0c\u56e0\u70ba\u6211\u5011\u4e0a\u9762\u8aaa\u904e\uff0c\u7de8\u865f\u5c0f\u7684\u6df1\u5ea6\u4e5f\u5c0f\u3002<\/p>\n

\u7a0b\u5f0f\u78bc:<\/h3>\n
const int _n=2e5+10;  \nint t,n,m,_,cnt,num[_n],in[_n],x,y;  \nbool vis[_n];  \nqueue<int> q;  \nvector<PII> es,ans;  \nVI G[_n];  \nmain(void) {ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);  \n  cin>>t;while(t--){  \n    cin>>n>>m;rep(i,0,n+1)G[i].clear();es.clear(),ans.clear();while(!q.empty())q.pop();  \n    memset(num,0,sizeof(num[0])*(n+1)),cnt=0,memset(in,0,sizeof(in[0])*(n+1));  \n    rep(i,0,m){cin>>_>>x>>y;if(!_)es.pb({x,y});else G[x].pb(y),in[y]++,ans.pb({x,y});}  \n    rep(i,1,n+1)if(!in[i])q.push(i);  \n    while(!q.empty()){  \n      int now=q.front();q.pop();  \n      num[now]=cnt++;vis[now]=1;for(int u:G[now]){in[u]--;if(!in[u])q.push(u);}  \n    }if(cnt<n){cout<<"NO\\n";goto A;}  \n    cout<<"YES\\n";  \n    for(PII e:es)if(num[e.fi]<num[e.se])cout<<e.fi<<' '<<e.se<<'\\n'; else cout<<e.se<<' '<<e.fi<<'\\n';  \n    for(PII e:ans)cout<<e.fi<<' '<<e.se<<'\\n';  \n    A:;  \n  }  \n  return 0;  \n}  \n<\/code><\/pre>\n
\u6a19\u982d\u3001\u6a21\u677f\u8acb\u9edeSubmission\u770b
\nSubmission<\/a><\/p>\n<\/div>\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_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[3],"tags":[10,9,8,38],"class_list":["post-162","post","type-post","status-publish","format-standard","hentry","category-ojcode","tag-codeforce","tag-ojcode","tag-8","tag-38"],"jetpack_publicize_connections":[],"yoast_head":"\nE. 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