結果
問題 | No.1288 yuki collection |
ユーザー |
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提出日時 | 2020-09-24 23:58:37 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
TLE
|
実行時間 | - |
コード長 | 3,467 bytes |
コンパイル時間 | 2,979 ms |
コンパイル使用メモリ | 212,820 KB |
最終ジャッジ日時 | 2025-01-14 20:15:44 |
ジャッジサーバーID (参考情報) |
judge1 / judge5 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 35 TLE * 5 |
ソースコード
#include <bits/stdc++.h>using namespace std;template< typename CapType, typename CostType >class MinCostFlowDAG {public:using Cat = CapType;using Cot = CostType;using pti = pair< Cot, int >;struct edge {int to, rev;Cat cap;Cot cost;};const int V;const Cot inf;vector< vector< edge > > G;vector< Cot > h, dist;vector< int > deg, ord, prevv, preve;MinCostFlowDAG(const int node_size) : V(node_size), inf(numeric_limits< Cot >::max()),G(V), h(V, inf), dist(V), deg(V, 0), prevv(V), preve(V) {}void add_edge(const int from, const int to, const Cat cap, const Cot cost) {if(cap == 0) return;G[from].push_back((edge) {to, (int) G[to].size(), cap, cost});G[to].push_back((edge) {from, (int) G[from].size() - 1, 0, -cost});++deg[to];}bool tsort() {queue< int > que;for(int i = 0; i < V; ++i) {if(deg[i] == 0) que.push(i);}while(!que.empty()) {const int p = que.front();que.pop();ord.push_back(p);for(auto &e : G[p]) {if(e.cap > 0 && --deg[e.to] == 0) que.push(e.to);}}return (*max_element(deg.begin(), deg.end()) == 0);}void calc_potential(const int s) {h[s] = 0;for(const int v : ord) {if(h[v] == inf) continue;for(const edge &e : G[v]) {if(e.cap > 0) h[e.to] = min(h[e.to], h[v] + e.cost);}}}void Dijkstra(const int s) {priority_queue< pti, vector< pti >, greater< pti > > que;fill(dist.begin(), dist.end(), inf);dist[s] = 0;que.push(pti(0, s));while(!que.empty()) {pti p = que.top();que.pop();const int v = p.second;if(dist[v] < p.first) continue;for(int i = 0; i < (int) G[v].size(); ++i) {edge &e = G[v][i];if(e.cap > 0 && dist[e.to] > dist[v] + e.cost + h[v] - h[e.to]) {dist[e.to] = dist[v] + e.cost + h[v] - h[e.to];prevv[e.to] = v, preve[e.to] = i;que.push(pti(dist[e.to], e.to));}}}}void update(const int s, const int t, Cat &f, Cot &res) {for(int i = 0; i < V; i++) {if(dist[i] != inf) h[i] += dist[i];}Cat d = f;for(int v = t; v != s; v = prevv[v]) {d = min(d, G[prevv[v]][preve[v]].cap);}f -= d;res += h[t] * d;for(int v = t; v != s; v = prevv[v]) {edge &e = G[prevv[v]][preve[v]];e.cap -= d;G[v][e.rev].cap += d;}}Cot solve(const int s, const int t, Cat f) {if(!tsort()) assert(false); // not DAGcalc_potential(s);Cot res = 0;while(f > 0) {Dijkstra(s);if(dist[t] == inf) return -1;update(s, t, f, res);}return res;}};int main() {int N;cin >> N;string S;cin >> S;vector< int > V(N);for(auto &v : V) cin >> v;MinCostFlowDAG< int64_t, int64_t > flow(N + N + 2);int X = N + N;int Y = X + 1;string tmp = "yuki";for(int i = 0; i < N; i++) {flow.add_edge(2 * i, 2 * i + 1, 1, -V[i]);if(S[i] == 'i') {flow.add_edge(2 * i + 1, Y, 1, 0);} else {if(S[i] == 'y') {flow.add_edge(X, 2 * i, 1, 0);}int p = tmp.find(S[i]);for(int j = i + 1; j < N; j++) {if(tmp[p + 1] == S[j]) {flow.add_edge(2 * i + 1, 2 * j, 1, 0);}}}}flow.add_edge(X, Y, N, 0);cout << -flow.solve(X, Y, N) << "\n";}