結果
問題 |
No.1320 Two Type Min Cost Cycle
|
ユーザー |
|
提出日時 | 2023-07-02 03:23:02 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 824 ms / 2,000 ms |
コード長 | 3,470 bytes |
コンパイル時間 | 2,442 ms |
コンパイル使用メモリ | 212,252 KB |
最終ジャッジ日時 | 2025-02-15 05:31:33 |
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 57 |
ソースコード
#include <bits/stdc++.h> using namespace std; using ll = long long; constexpr int INF = (int)1e9 + 1001010; constexpr ll llINF = (ll)4e18 + 22000020; const string endn = "\n"; template <class T> inline vector<vector<T>> vector2(size_t i, size_t j, const T &init = T()) {return vector<vector<T>>(i, vector<T>(j, init));} const string ELEM_SEPARATION = " ", VEC_SEPARATION = endn; template<class T> istream& operator >>(istream &i, vector<T> &A) {for(auto &I : A) {i >> I;} return i;} template<class T> ostream& operator <<(ostream &o, const vector<vector<T>> &A) {int i=A.size(); for(auto &I : A){o << I << (--i ? VEC_SEPARATION : "");} return o;} template<class T> ostream& operator <<(ostream &o, const vector<T> &A) {int i=A.size(); for(auto &I : A){o << I << (--i ? ELEM_SEPARATION : "");} return o;} template<class T> vector<T>& operator ++(vector<T> &A, int n) {for(auto &I : A) {I++;} return A;} template<class T> vector<T>& operator --(vector<T> &A, int n) {for(auto &I : A) {I--;} return A;} template<class T, class U> bool chmax(T &a, const U &b) {return ((a < b) ? (a = b, true) : false);} template<class T, class U> bool chmin(T &a, const U &b) {return ((a > b) ? (a = b, true) : false);} ll floor(ll a, ll b) {assert(b != 0); return((a%b != 0 && ((a>0) != (b>0))) ? a/b-1 : a/b);} ll ceil (ll a, ll b) {assert(b != 0); return((a%b != 0 && ((a>0) == (b>0))) ? a/b+1 : a/b);} // ================================== ここまでテンプレ ================================== template<class T> using priority_queue_greater = priority_queue<T, vector<T>, greater<T>>; int main(){ ios::sync_with_stdio(false); cin.tie(nullptr); int t; cin >> t; int n, m; cin >> n >> m; auto edges = vector2<pair<int, ll>>(n, 0); for(int i = 0; i < m; i++){ int u, v, w; cin >> u >> v >> w; u--; v--; edges[u].emplace_back(v, w); if(t == 0) edges[v].emplace_back(u, w); } auto solve = [&](int root) -> ll { // rootを根とする最短路木を作る vector<ll> distance(n, llINF); vector<int> label(n); { priority_queue_greater<tuple<ll, int, int>> pq; // {dist, vIndex} pq.emplace(0, root, root); while(!pq.empty()){ auto [d, now, pre] = pq.top(); pq.pop(); if(distance[now] < d) continue; distance[now] = d; if(pre == root) label[now] = now; else label[now] = label[pre]; for(auto [nxt, cost] : edges[now]){ pq.emplace(d+cost, nxt, now); } } } // 最短閉路を見つける ll ret = llINF; for(int from = 0; from < n; from++){ if(from == root) continue; for(auto [to, cost] : edges[from]){ if(t == 0){ if(label[from] == label[to]) continue; if(to == root && label[from] == from) continue; else chmin(ret, distance[from] + distance[to] + cost); } if(t == 1){ if(to != root) continue; else chmin(ret, distance[from] + cost); } } } return ret; }; ll ans = llINF; for(int i = 0; i < n; i++){ auto s = solve(i); chmin(ans, s); } if(ans == llINF) cout << -1 << endl; else cout << ans << endl; return 0; }