結果
問題 | No.1812 Uribo Road |
ユーザー |
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提出日時 | 2021-12-31 14:58:41 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 197 ms / 5,000 ms |
コード長 | 2,161 bytes |
コンパイル時間 | 1,402 ms |
コンパイル使用メモリ | 91,640 KB |
最終ジャッジ日時 | 2025-01-27 08:07:56 |
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 30 |
ソースコード
#include <iostream>#include <vector>#include <queue>#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;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) {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] });}VV<int> dist = dijkstra(N, edge, R, route);V<VV<int> > dp(1 << K, VV<int>(K, V<int>(2, inf)));rep(i, 0, K) {rep(j, 0, 2) {dp[1 << i][i][j] = dist[0][edge[R[i]][j ^ 1]] + edge[R[i]][2];}}rep(bit, 1, 1 << K) {rep(s, 0, K) {if ((bit & (1 << s)) == 0) {continue;}rep(t, 0, K) {if (bit & (1 << t)) {continue;}int b = bit | (1 << t); int c = edge[R[t]][2];rep(x, 0, 2) {rep(y, 0, 2) {int p = edge[R[s]][x]; int q = edge[R[t]][y ^ 1];int d = dp[bit][s][x] + dist[p][q] + c;if (dp[b][t][y] > d) {dp[b][t][y] = d;}}}}}}int ans = inf;rep(i, 0, K) {rep(j, 0, 2) {int d = dp[(1 << K) - 1][i][j] + dist[edge[R[i]][j]][N - 1];if (ans > d) {ans = d;}}}cout << ans << endl;return 0;}