結果
問題 | No.2301 Namorientation |
ユーザー |
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提出日時 | 2023-05-12 21:55:21 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 520 ms / 3,000 ms |
コード長 | 1,841 bytes |
コンパイル時間 | 4,233 ms |
コンパイル使用メモリ | 257,428 KB |
最終ジャッジ日時 | 2025-02-12 22:38:43 |
ジャッジサーバーID (参考情報) |
judge5 / judge4 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 30 |
ソースコード
#include<bits/stdc++.h>#include<atcoder/all>using namespace std;using namespace atcoder;typedef modint998244353 mint;typedef long long ll;int main(){int n; cin >> n;vector<vector<pair<int,int>>> ikeru;ikeru.resize(n);vector<int> deg(n);vector<int> x(n), y(n);for (int i=0; i<n; i++){int a, b;cin >> a >> b;a--; b--;deg[a]++;deg[b]++;x[i] = a;y[i] = b;ikeru[a].push_back(pair(b,i));ikeru[b].push_back(pair(a,i));}vector<int> mada;vector<bool> isnamori(n, true);vector<int> comefrom(n,-1);vector<int> kousha(n,-1);for (int i=0; i<n; i++){if (deg[i] == 1){mada.push_back(i);}}while (!mada.empty()){int i = mada.back();mada.pop_back();isnamori[i] = false;for (auto [j,c]: ikeru[i]){deg[j]--;if (deg[j] == 1){mada.push_back(j);}else if (deg[j] <= 0){kousha[c] = i;}}}vector<bool> tansaku(n);for (int i=0; i<n; i++){if (!isnamori[i]){tansaku[i] = true;}}for (int i=0; i<n; i++){if (isnamori[i]){mada.push_back(i);break;}}vector<int> arr;while(!mada.empty()){int i = mada.back();mada.pop_back();if (tansaku[i]) continue;arr.push_back(i);tansaku[i] = true;for (auto [j,c]: ikeru[i]){if (!tansaku[j]){mada.push_back(j);}}}int m = arr.size();arr.push_back(arr[0]);for (int i=0; i<m; i++){comefrom[arr[i+1]] = arr[i];}for (int i=0; i<n; i++){if (isnamori[x[i]] && isnamori[y[i]]){if (comefrom[y[i]] == x[i]){cout << "->" << endl;}else{cout << "<-" << endl;}}else if (isnamori[x[i]] && !isnamori[y[i]]){cout << "<-" << endl;}else if (!isnamori[x[i]] && isnamori[y[i]]){cout << "->" << endl;}else{if (kousha[i] == y[i]){cout << "->" << endl;}else{cout << "<-" << endl;}}}}