結果

問題 No.1288 yuki collection
ユーザー lorent_kyoprolorent_kyopro
提出日時 2020-11-14 01:34:31
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 108 ms / 5,000 ms
コード長 5,841 bytes
コンパイル時間 2,120 ms
コンパイル使用メモリ 220,824 KB
実行使用メモリ 4,380 KB
最終ジャッジ日時 2023-09-30 04:37:46
合計ジャッジ時間 5,267 ms
ジャッジサーバーID
（参考情報） 		judge11 / judge14
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 1 ms
4,380 KB
testcase_01 AC 2 ms
4,376 KB
testcase_02 AC 2 ms
4,380 KB
testcase_03 AC 2 ms
4,376 KB
testcase_04 AC 1 ms
4,380 KB
testcase_05 AC 1 ms
4,376 KB
testcase_06 AC 1 ms
4,380 KB
testcase_07 AC 1 ms
4,376 KB
testcase_08 AC 2 ms
4,380 KB
testcase_09 AC 1 ms
4,376 KB
testcase_10 AC 1 ms
4,380 KB
testcase_11 AC 1 ms
4,376 KB
testcase_12 AC 2 ms
4,376 KB
testcase_13 AC 75 ms
4,380 KB
testcase_14 AC 80 ms
4,376 KB
testcase_15 AC 62 ms
4,380 KB
testcase_16 AC 62 ms
4,376 KB
testcase_17 AC 80 ms
4,376 KB
testcase_18 AC 82 ms
4,380 KB
testcase_19 AC 78 ms
4,380 KB
testcase_20 AC 86 ms
4,380 KB
testcase_21 AC 90 ms
4,380 KB
testcase_22 AC 93 ms
4,376 KB
testcase_23 AC 91 ms
4,380 KB
testcase_24 AC 79 ms
4,380 KB
testcase_25 AC 79 ms
4,376 KB
testcase_26 AC 81 ms
4,380 KB
testcase_27 AC 40 ms
4,376 KB
testcase_28 AC 50 ms
4,376 KB
testcase_29 AC 36 ms
4,380 KB
testcase_30 AC 4 ms
4,380 KB
testcase_31 AC 5 ms
4,380 KB
testcase_32 AC 6 ms
4,376 KB
testcase_33 AC 76 ms
4,380 KB
testcase_34 AC 108 ms
4,376 KB
testcase_35 AC 87 ms
4,380 KB
testcase_36 AC 50 ms
4,376 KB
testcase_37 AC 55 ms
4,380 KB
testcase_38 AC 37 ms
4,376 KB
testcase_39 AC 32 ms
4,380 KB
testcase_40 AC 2 ms
4,376 KB
testcase_41 AC 1 ms
4,380 KB
testcase_42 AC 2 ms
4,376 KB
権限があれば一括ダウンロードができます

ソースコード

diff # 

#include <bits/stdc++.h>

#include <algorithm>
#include <cassert>
#include <limits>
#include <queue>
#include <vector>

namespace atcoder {

template <class Cap, class Cost> struct mcf_graph {
  public:
    mcf_graph() {}
    mcf_graph(int n) : _n(n), g(n) {}

    int add_edge(int from, int to, Cap cap, Cost cost) {
        assert(0 <= from && from < _n);
        assert(0 <= to && to < _n);
        int m = int(pos.size());
        pos.push_back({from, int(g[from].size())});
        int from_id = int(g[from].size());
        int to_id = int(g[to].size());
        if (from == to) to_id++;
        g[from].push_back(_edge{to, to_id, cap, cost});
        g[to].push_back(_edge{from, from_id, 0, -cost});
        return m;
    }

    struct edge {
        int from, to;
        Cap cap, flow;
        Cost cost;
    };

    edge get_edge(int i) {
        int m = int(pos.size());
        assert(0 <= i && i < m);
        auto _e = g[pos[i].first][pos[i].second];
        auto _re = g[_e.to][_e.rev];
        return edge{
            pos[i].first, _e.to, _e.cap + _re.cap, _re.cap, _e.cost,
        };
    }
    std::vector<edge> edges() {
        int m = int(pos.size());
        std::vector<edge> result(m);
        for (int i = 0; i < m; i++) {
            result[i] = get_edge(i);
        }
        return result;
    }

    std::pair<Cap, Cost> flow(int s, int t) {
        return flow(s, t, std::numeric_limits<Cap>::max());
    }
    std::pair<Cap, Cost> flow(int s, int t, Cap flow_limit) {
        return slope(s, t, flow_limit).back();
    }
    std::vector<std::pair<Cap, Cost>> slope(int s, int t) {
        return slope(s, t, std::numeric_limits<Cap>::max());
    }
    std::vector<std::pair<Cap, Cost>> slope(int s, int t, Cap flow_limit) {
        assert(0 <= s && s < _n);
        assert(0 <= t && t < _n);
        assert(s != t);
        std::vector<Cost> dual(_n, 0), dist(_n);
        std::vector<int> pv(_n), pe(_n);
        std::vector<bool> vis(_n);
        auto dual_ref = [&]() {
            std::fill(dist.begin(), dist.end(),
                      std::numeric_limits<Cost>::max());
            std::fill(pv.begin(), pv.end(), -1);
            std::fill(pe.begin(), pe.end(), -1);
            std::fill(vis.begin(), vis.end(), false);
            struct Q {
                Cost key;
                int to;
                bool operator<(Q r) const { return key > r.key; }
            };
            std::priority_queue<Q> que;
            dist[s] = 0;
            que.push(Q{0, s});
            while (!que.empty()) {
                int v = que.top().to;
                que.pop();
                if (vis[v]) continue;
                vis[v] = true;
                if (v == t) break;
                for (int i = 0; i < int(g[v].size()); i++) {
                    auto e = g[v][i];
                    if (vis[e.to] || !e.cap) continue;
                    Cost cost = e.cost - dual[e.to] + dual[v];
                    if (dist[e.to] - dist[v] > cost) {
                        dist[e.to] = dist[v] + cost;
                        pv[e.to] = v;
                        pe[e.to] = i;
                        que.push(Q{dist[e.to], e.to});
                    }
                }
            }
            if (!vis[t]) {
                return false;
            }

            for (int v = 0; v < _n; v++) {
                if (!vis[v]) continue;
                dual[v] -= dist[t] - dist[v];
            }
            return true;
        };
        Cap flow = 0;
        Cost cost = 0, prev_cost_per_flow = -1;
        std::vector<std::pair<Cap, Cost>> result;
        result.push_back({flow, cost});
        while (flow < flow_limit) {
            if (!dual_ref()) break;
            Cap c = flow_limit - flow;
            for (int v = t; v != s; v = pv[v]) {
                c = std::min(c, g[pv[v]][pe[v]].cap);
            }
            for (int v = t; v != s; v = pv[v]) {
                auto& e = g[pv[v]][pe[v]];
                e.cap -= c;
                g[v][e.rev].cap += c;
            }
            Cost d = -dual[s];
            flow += c;
            cost += c * d;
            if (prev_cost_per_flow == d) {
                result.pop_back();
            }
            result.push_back({flow, cost});
            prev_cost_per_flow = d;
        }
        return result;
    }

  private:
    int _n;

    struct _edge {
        int to, rev;
        Cap cap;
        Cost cost;
    };

    std::vector<std::pair<int, int>> pos;
    std::vector<std::vector<_edge>> g;
};

}  // namespace atcoder

using namespace std;
using namespace atcoder;

__attribute__((constructor))
void fast_io() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
}

int main() {
    int n;
    string s;
    cin >> n >> s;
    vector<int> v(n);
    for (auto& vi : v) cin >> vi;

    mcf_graph<int, long long> g(n + 2);
    const int a = n, b = n + 1;

    int Y = -1, U = -1, K = -1, I = -1;
    const int inf = INT_MAX;
    for (int i = n-1; i >= 0; --i) {
        if (s[i] == 'i') {
            g.add_edge(i, b, 1, inf - v[i]);
            if (I != -1) g.add_edge(i, I, inf, 0);
            I = i;
        } else if (s[i] == 'k') {
            if (K != -1) g.add_edge(i, K, inf, 0);
            if (I != -1) g.add_edge(i, I, 1, inf - v[i]);
            K = i;
        } else if (s[i] == 'u') {
            if (U != -1) g.add_edge(i, U, inf, 0);
            if (K != -1) g.add_edge(i, K, 1, inf - v[i]);
            U = i;
        } else if (s[i] == 'y') {
            if (Y != -1) g.add_edge(i, Y, inf, 0);
            if (U != -1) g.add_edge(i, U, 1, inf - v[i]);
            Y = i;
        }
    }
    if (Y != -1) g.add_edge(a, Y, inf, 0);
    g.add_edge(a, b, n, (long long)4 * inf);
    auto [_, cost] = g.flow(a, b, n);
    long long ans = -(cost - (long long)4 * inf * n);
    cout << ans << '\n';
}
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