結果
問題 |
No.1812 Uribo Road
|
ユーザー |
![]() |
提出日時 | 2021-12-31 11:53:17 |
言語 | C++17(gcc12) (gcc 12.3.0 + boost 1.87.0) |
結果 |
WA
|
実行時間 | - |
コード長 | 2,571 bytes |
コンパイル時間 | 8,215 ms |
コンパイル使用メモリ | 274,496 KB |
最終ジャッジ日時 | 2025-01-27 08:05:51 |
ジャッジサーバーID (参考情報) |
judge5 / judge4 |
(要ログイン)
ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 21 WA * 9 |
ソースコード
//山登り #include <bits/stdc++.h> #include <ctime> #include <cstdlib> #define rep(i, l, n) for (int i = (l); i < (n); i++) using namespace std; using Pair = pair<int, int>; template <class T> using V = vector<T>; template <class T> using VV = V<V<T> >; const int inf = 2000000000; using chrono::duration_cast; using chrono::milliseconds; using chrono::system_clock; inline int getnow() { return duration_cast<milliseconds>(system_clock::now().time_since_epoch()).count(); } VV<int> dijkstra(int n, VV<int>& edge, V<int>& R, VV<Pair>& route) { VV<int> dist(n, V<int>(0)); V<int> st = { 0,n - 1 }; rep(i, 0, R.size()) { st.push_back(edge[R[i]][0]); st.push_back(edge[R[i]][1]); } rep(i, 0, st.size()) { int k = st[i]; V<int> di(n, -1); priority_queue<Pair, V<Pair>, greater<Pair> > pq; pq.push({ 0,k }); int cnt = 0; while (pq.size() && cnt < n) { Pair p = pq.top(); pq.pop(); int d = p.first; int v = p.second; if (di[v] == -1) { cnt++; di[v] = d; rep(j, 0, route[v].size()) { Pair p = { d + route[v][j].second,route[v][j].first }; pq.push(p); } } } dist[k] = di; } return dist; } int main(void) { srand(time(NULL)); int start = getnow(); int N, M, K; cin >> N >> M >> K; V<int> R(K); rep(i, 0, K) { cin >> R[i]; R[i] -= 1; } VV<int> edge(M, V<int>(3)); VV<Pair> route(N, V<Pair>(0)); rep(i, 0, M) { rep(j, 0, 3) { cin >> edge[i][j]; } edge[i][0] -= 1; edge[i][1] -= 1; route[edge[i][0]].push_back({ edge[i][1],edge[i][2] }); route[edge[i][1]].push_back({ edge[i][0],edge[i][2] }); } int rsum = 0; rep(i, 0, R.size()) { rsum += edge[R[i]][2]; } VV<int> dist = dijkstra(N, edge, R, route); V<int> p = {}; rep(i, 0, K) { p.push_back(i); } int ans = inf; int tans = inf; while (getnow() - start < 4990) { int x = rand() % K; int y = rand() % K; if (K > 1) { y = (x + rand() % (K - 1)) % K; } int tmp = p[x]; p[x] = p[y]; p[y] = tmp; V<int> q = p; VV<int> dp(K, V<int>(2, inf)); rep(i, 0, 2) { dp[0][i] = rsum + dist[0][edge[R[p[0]]][i]]; } rep(k, 0, K - 1) { int s = p[k]; int t = p[k + 1]; rep(i, 0, 2) { rep(j, 0, 2) { int d = dp[k][i ^ 1] + dist[edge[R[s]][i]][edge[R[t]][j]]; if (dp[k + 1][j] > d) { dp[k + 1][j] = d; } } } } int a = inf; rep(j, 0, 2) { int d = dp[K - 1][j ^ 1] + dist[edge[R[p[K - 1]]][j]][N - 1]; if (a > d) { a = d; } } if (ans > a) { ans = a; } else { rep(i, 0, K) { p[i] = q[i]; } } } cout << ans << endl; return 0; }