oj.uz

답안 #805385

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
805385 2023-08-03T16:11:22 Z FedShat 수도 (JOI20_capital_city) C++17
11 / 100
 1859 ms 524288 KB 
#include <bits/stdc++.h>

using namespace std;
using ll = long long;
constexpr int INF = numeric_limits<int>::max() / 2;
constexpr ll INFLL = numeric_limits<ll>::max() / 2;

template<class T>
istream &operator>>(istream &is, vector<T> &a) {
    for (auto &i : a) {
        is >> i;
    }
    return is;
}

struct LCA {
    static constexpr int k = 18;
    vector<vector<int>> up;
    vector<int> depth;

    LCA() {}
    LCA(int n) {
        up.resize(k, vector<int>(n));
        depth.resize(n);
    }

    void add_leaf(int v, int p) {
        depth[v] = depth[p] + 1;
        up[0][v] = p;
        for (int i = 1; i < k; ++i) {
            up[i][v] = up[i - 1][up[i - 1][v]];
        }
    }

    int up_d(int v, int d) {
        for (int i = k - 1; i >= 0; --i) {
            if (d >= (1 << i)) {
                v = up[i][v];
                d -= (1 << i);
            }
        }
        return v;
    }

    int lca(int u, int v) {
        if (depth[u] < depth[v]) {
            swap(u, v);
        }
        u = up_d(u, depth[u] - depth[v]);
        for (int i = k - 1; i >= 0; --i) {
            if (up[i][u] != up[i][v]) {
                u = up[i][u];
                v = up[i][v];
            }
        }
        if (u == v) {
            return u;
        }
        return up[0][u];
    }
};

vector<vector<int>> tr, g, gg;
vector<int> tin, tout, c, ggg;
int timer = 0;
LCA st;

void add(int v, int p) {
    g.emplace_back();
    ggg[v] = g.size() - 1;
    g.back().push_back(c[v]);
    gg[0][v] = ggg[p];
    for (int i = 1; i < LCA::k; ++i) {
        g.emplace_back();
        gg[i][v] = g.size() - 1;
        g.back().emplace_back(gg[i - 1][v]);
        g.back().emplace_back(gg[i - 1][st.up[i - 1][v]]);
    }
}

void dfs(int v, int p) {
    tin[v] = timer++;
    if (p == -1) {
        g.emplace_back();
        ggg[v] = g.size() - 1;
        g.back().push_back(c[v]);
    }
    for (auto u : tr[v]) {
        if (u != p) {
            st.add_leaf(u, v);
            add(u, v);
            dfs(u, v);
        }
    }
    tout[v] = timer;
}

vector<bool> used;
vector<int> topsort;

void dfs1(int v) {
    used[v] = 1;
    for (auto u : g[v]) {
        if (!used[u]) {
            dfs1(u);
        }
    }
    topsort.push_back(v);
}

vector<vector<int>> gr;
vector<int> cond, siz;
int cnt = 0;
int k;

void dfs2(int v) {
    used[v] = 1;
    cond[v] = cnt;
    siz[cnt] += (v < k);
    for (auto u : gr[v]) {
        if (!used[u]) {
            dfs2(u);
        }
    }
}

vector<vector<int>> gcond;

int main() {
    cin.tie(0)->sync_with_stdio(0);
#ifdef __APPLE__
    freopen("input.txt", "r", stdin);
#endif
    int n;
    cin >> n >> k;
    tr.resize(n);
    for (int i = 0; i < n - 1; ++i) {
        int u, v;
        cin >> u >> v;
        --u;
        --v;
        tr[u].push_back(v);
        tr[v].push_back(u);
    }
    c.resize(n);
    cin >> c;
    for (auto &i : c) {
        --i;
    }
    tin.resize(n);
    tout.resize(n);
    st = LCA(n);
    g.resize(k);
    gg.resize(LCA::k, vector<int>(n));
    ggg.resize(n);
    dfs(0, -1);
    vector<vector<int>> cc(k);
    for (int i = 0; i < n; ++i) {
        cc[c[i]].push_back(i);
    }
    auto add_edges = [&](int v, int d) {
        int cv = c[v];
        // for (int i = 0; i < d; ++i) {
        //     v = st.up[0][v];
        //     g[cv].push_back(c[v]);
        // }
        // if (cv == 2) {
        //     cout << "nigga\n";
        // }
        for (int i = LCA::k - 1; i >= 0; --i) {
            if (d >= (1 << i)) {
                g[cv].push_back(gg[i][v]);
                d -= (1 << i);
                v = st.up[i][v];
            }
        }
    };
    for (int i = 0; i < k; ++i) {
        sort(cc[i].begin(), cc[i].end(), [&](int u, int v) {
            return tin[u] < tin[v];
        });
        for (int j = 0; j + 1 < (int) cc[i].size(); ++j) {
            int l = st.lca(cc[i][j], cc[i][j + 1]);
            add_edges(cc[i][j], st.depth[cc[i][j]] - st.depth[l]);
            add_edges(cc[i][j + 1], st.depth[cc[i][j + 1]] - st.depth[l]);
        }
    }
    // for (int i = 0; i < (int) g.size(); ++i) {
    //     for (int j : g[i]) {
    //         cout << i + 1 << " " << j + 1 << "\n";
    //     }
    // }
    int sz = g.size();
    gr.resize(sz);
    for (int i = 0; i < sz; ++i) {
        for (int j : g[i]) {
            gr[j].push_back(i);
        }
    }
    used.resize(sz);
    for (int i = 0; i < sz; ++i) {
        if (!used[i]) {
            dfs1(i);
        }
    }
    used.assign(sz, 0);
    cond.resize(sz);
    reverse(topsort.begin(), topsort.end());
    for (int i : topsort) {
        if (!used[i]) {
            siz.emplace_back();
            dfs2(i);
            ++cnt;
        }
    }
    gcond.resize(cnt);
    for (int i = 0; i < sz; ++i) {
        for (int j : g[i]) {
            if (cond[i] != cond[j]) {
                gcond[cond[i]].push_back(cond[j]);
            }
        }
    }
    for (int i = 0; i < cnt; ++i) {
        sort(gcond[i].begin(), gcond[i].end());
        gcond[i].resize(unique(gcond[i].begin(), gcond[i].end()) - gcond[i].begin());
    }
    used.assign(cnt, 0);
    int ans = INF;
    for (int i = 0; i < cnt; ++i) {
        if (gcond[i].empty()) {
            ans = min(ans, siz[i]);
        }
    }
    cout << ans - 1 << "\n";
}

Subtask #1
1.0 / 1.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 212 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 11 ms 6960 KB Output is correct
12 Correct 11 ms 6904 KB Output is correct
13 Correct 11 ms 6900 KB Output is correct
14 Correct 11 ms 7004 KB Output is correct
15 Correct 11 ms 7112 KB Output is correct
16 Correct 12 ms 7288 KB Output is correct
17 Correct 14 ms 7212 KB Output is correct
18 Correct 14 ms 7288 KB Output is correct
19 Correct 11 ms 7316 KB Output is correct
20 Correct 10 ms 7236 KB Output is correct
21 Correct 10 ms 7200 KB Output is correct
22 Correct 11 ms 7344 KB Output is correct
23 Correct 12 ms 7644 KB Output is correct
24 Correct 11 ms 7216 KB Output is correct
25 Correct 11 ms 6780 KB Output is correct
26 Correct 11 ms 6944 KB Output is correct
27 Correct 11 ms 6752 KB Output is correct
28 Correct 11 ms 7060 KB Output is correct
29 Correct 11 ms 6904 KB Output is correct
30 Correct 11 ms 6964 KB Output is correct

Subtask #3
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 1859 ms 524288 KB Execution killed with signal 9
2 Halted 0 ms 0 KB -

Subtask #4
0 / 59.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 11 ms 6960 KB Output is correct
12 Correct 11 ms 6904 KB Output is correct
13 Correct 11 ms 6900 KB Output is correct
14 Correct 11 ms 7004 KB Output is correct
15 Correct 11 ms 7112 KB Output is correct
16 Correct 12 ms 7288 KB Output is correct
17 Correct 14 ms 7212 KB Output is correct
18 Correct 14 ms 7288 KB Output is correct
19 Correct 11 ms 7316 KB Output is correct
20 Correct 10 ms 7236 KB Output is correct
21 Correct 10 ms 7200 KB Output is correct
22 Correct 11 ms 7344 KB Output is correct
23 Correct 12 ms 7644 KB Output is correct
24 Correct 11 ms 7216 KB Output is correct
25 Correct 11 ms 6780 KB Output is correct
26 Correct 11 ms 6944 KB Output is correct
27 Correct 11 ms 6752 KB Output is correct
28 Correct 11 ms 7060 KB Output is correct
29 Correct 11 ms 6904 KB Output is correct
30 Correct 11 ms 6964 KB Output is correct
31 Runtime error 1859 ms 524288 KB Execution killed with signal 9
32 Halted 0 ms 0 KB -