oj.uz

답안 #335041

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
335041 2020-12-11T00:38:46 Z 12tqian 늑대인간 (IOI18_werewolf) C++17
15 / 100
 4000 ms 117092 KB 
#include "werewolf.h"
#include <bits/stdc++.h>

struct DSU {
    std::vector<int> e;
    void init(int n) {
        e = std::vector<int>(n, -1);
    }
    int get(int x) {
        return e[x] < 0 ? x : e[x] = get(e[x]);
    }
    bool same_set(int a, int b) {
        return get(a) == get(b);
    }
    int size(int x) {
        return -e[get(x)];
    }
    bool unite(int x, int y) {
        x = get(x), y = get(y);
        if (x == y) return false;
        if (e[x] > e[y]) std::swap(x, y);
        e[x] += e[y]; e[y] = x;
        return true;
    }
    bool head(int x, int y) {
        x = get(x), y = get(y);
        if (x == y) return false;
        e[y] = x;
        return true;
    }
};

struct LCAJump {
    int n;
    std::vector<std::vector<int>> par;
    std::vector<std::vector<int>> adj;
    std::vector<int> depth;
    void init(int _n) {
        n = _n;
        int d = 1;
        while ((1 << d) < n) d++;
        par.assign(d, std::vector<int>(n));
        adj.resize(n);
        depth.resize(n);
    }
    void ae(int x, int y) {
        adj[x].push_back(y);
        adj[y].push_back(x);
    }
    void gen(int root = 0) {
        par[0][root] = root;
        dfs(root);
    }
    void dfs(int src = 0) {
        for (int i = 1; i < par.size(); i++) {
            par[i][src] = par[i - 1][par[i - 1][src]];
        }
        for (int nxt: adj[src]) {
            if (nxt == par[0][src]) continue;
            depth[nxt] = depth[par[0][nxt] = src] + 1;
            dfs(nxt);
        }
    }
    int jump(int x, int d) {
        for (int i = 0; i < par.size(); i++) {
            if ((d >> i) & 1) {
                x = par[i][x];
            }
        }
        return x;
    }
    int lca(int x, int y) {
        if (depth[x] < depth[y]) std::swap(x, y);
        x = jump(x, depth[x] - depth[y]);
        if (x == y) return x;
        for (int i = par.size() - 1; i >= 0; i--) {
            int nx = par[i][x];
            int ny = par[i][y];
            if (nx != ny) x = nx, y = ny;
        }
        return par[0][x];
    }
};

template <class T> struct SegTree {
    const T ID = 1e9;
    T comb(T a, T b) {
        return std::min(a, b);
    }
    int n;
    std::vector<T> seg;
    void init(int _n) {
        n = _n;
        seg.assign(2 * n, ID);
    }
    void pull(int p) {
        seg[p] = comb(seg[2 * p], seg[2 * p + 1]);
    }
    void upd(int p, T val) {
        seg[p += n] = val;
        for (p /= 2; p; p /= 2) pull(p);
    }
    void add(int p, T val) {
        seg[p += n] += val;
        for (p /= 2; p; p /= 2) pull(p);
    }
    T query(int l, int r) {
        T ra = ID, rb = ID;
        for (l += n, r += n + 1; l < r; l /= 2, r /= 2) {
            if (l & 1) ra = comb(ra, seg[l++]);
            if (r & 1) rb = comb(seg[--r], rb);
        }
        return comb(ra, rb);
    }
};

std::vector<int> check_validity(int N, std::vector<int> X, std::vector<int> Y, std::vector<int> S, std::vector<int> E, std::vector<int> L, std::vector<int> R) {
    using namespace std;
    int Q = S.size();
    int M = X.size();

    vector<int> ans(Q);
    vector<vector<int>> g1(N), g2(N);
    DSU d1, d2; d1.init(N), d2.init(N);
    vector<vector<int>> adj(N);

    for (int i = 0; i < M; i++) {
        adj[X[i]].push_back(Y[i]);
        adj[Y[i]].push_back(X[i]);
    }

    LCAJump j1, j2;
    j1.init(N), j2.init(N);

    for (int i = 0; i < N; i++) {
        for (int j : adj[i]) {
            if (j > i || d1.same_set(i, j)) continue;
            int u = i;
            int v = d1.get(j);
            g1[u].push_back(v);
            g1[v].push_back(u);
            d1.head(u, v);
            j1.ae(u, v);;
        }
    }

    for (int i = N - 1; i >= 0; i--){ 
        for (int j : adj[i]) {
            if (j < i || d2.same_set(i, j)) continue;
            int u = i;
            int v = d2.get(j);
            g2[u].push_back(v);
            g2[v].push_back(u);
            d2.head(u, v);
            j2.ae(u, v);;
        }
    }

    int r1 = N - 1;
    int r2 = 0;

    vector<array<int, 2>> gap1(N), gap2(N);
    vector<int> o1, o2;

    int ti = 0;
    function<int(int, int)> dfs1 = [&](int src, int par) -> int {
        gap1[src][0] = gap1[src][1] = ti++;
        o1.push_back(src);
        for (int nxt : g1[src]) {
            if (nxt == par) continue;
            gap1[src][1] = max(gap1[src][1], dfs1(nxt, src));
        }
        return gap1[src][1];
    };
    function<int(int, int)> dfs2 = [&](int src, int par) -> int {
        gap2[src][0] = gap2[src][1] = ti++;
        o2.push_back(src);
        for (int nxt : g2[src]) {
            if (nxt == par) continue;
            gap2[src][1] = max(gap2[src][1], dfs2(nxt, src));
        }
        return gap2[src][1];
    };

    dfs1(r1, -1);
    ti = 0;
    dfs2(r2, -1);
    j1.gen(r1);
    j2.gen(r2);

    auto up = [&](int t, LCAJump& L, int src, int high) -> int {
        for (int i = L.par.size() - 1; i >= 0; i--) {
            if (t == 0) { 
                if (L.par[i][src] <= high) src = L.par[i][src];
            } else {
                if (L.par[i][src] >= high) src = L.par[i][src];
            }   
        }

        return src;
    };  

    map<int, int> conv;
    for (int i = 0; i < N; i++) 
        conv[o1[i]] = i;
    vector<int> loc(N);

    // cout << "STUFF" << endl;
    // for (int i = 0; i < N; i++) 
    //     cout << o1[i] << " ";
    // cout << endl;
    // for (int i = 0; i < N; i++)
    //     cout << o2[i] << " ";
    // cout << endl << endl;

    // for (int i = 0; i < N; i++)
    //     o1[i] = conv[o1[i]], o2[i] = conv[o2[i]], loc[o2[i]] = i;

    // cout << "NEW STUFF" << endl;
    // for (int i = 0; i < N; i++)
    //     cout << o1[i];
    // cout << endl;
    // for (int i = 0; i < N; i++)
    //     cout << o2[i];
    // cout << endl << endl;

    vector<vector<array<int, 4>>> lower(N);

    for (int i = 0; i < Q; i++) {
        int st = S[i];
        int ed = E[i];
        swap(st, ed);

        int c1 = up(0, j1, st, R[i]);
        int c2 = up(1, j2, ed, L[i]);
        vector<int> oc(N);
        for (int i = gap1[c1][0]; i <= gap1[c1][1]; i++)
            oc[o1[i]]++;
        for (int i = gap2[c2][0]; i <= gap2[c2][1]; i++)
            oc[o2[i]]++;
        bool ok = false;
        for (int i = 0; i < N; i++)
            ok |= (oc[i] > 1);
        ans[i] = ok;
        // cout << "QUERY " << c1 << " " << c2 << endl;
        // cout << "QUERY " << gap1[c1][0] << " " << gap1[c1][1] << " " << gap2[c2][0] << " " << gap2[c2][1] << endl;

        // lower[gap1[c1][0]].push_back({gap1[c1][0], gap2[c2][0], gap2[c2][1], i});
    }

    // SegTree<int> seg;
    // seg.init(N);

    // for (int i = N - 1; i >= 0; i--) {
    //     seg.upd(loc[o2[i]], i);

    //     for (auto& qq : lower[i]) {
    //         if (seg.query(qq[1], qq[2]) <= qq[0]) ans[qq[3]] = 1;
    //         else ans[qq[3]] = 0;
    //     }
    // }
    // for (int x : ans) cout << x << '\n';
    // cout << "MADE IT" << endl;
    return ans;
}

Compilation message

werewolf.cpp: In member function 'void LCAJump::dfs(int)':
werewolf.cpp:55:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |         for (int i = 1; i < par.size(); i++) {
      |                         ~~^~~~~~~~~~~~
werewolf.cpp: In member function 'int LCAJump::jump(int, int)':
werewolf.cpp:65:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |         for (int i = 0; i < par.size(); i++) {
      |                         ~~^~~~~~~~~~~~

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 46 ms 2156 KB Output is correct
11 Correct 38 ms 2028 KB Output is correct
12 Correct 20 ms 2028 KB Output is correct
13 Correct 49 ms 2284 KB Output is correct
14 Correct 41 ms 2284 KB Output is correct
15 Correct 38 ms 2156 KB Output is correct

Subtask #3
0 / 34.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 4049 ms 117092 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 51.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 364 KB Output is correct
9 Correct 1 ms 364 KB Output is correct
10 Correct 46 ms 2156 KB Output is correct
11 Correct 38 ms 2028 KB Output is correct
12 Correct 20 ms 2028 KB Output is correct
13 Correct 49 ms 2284 KB Output is correct
14 Correct 41 ms 2284 KB Output is correct
15 Correct 38 ms 2156 KB Output is correct
16 Execution timed out 4049 ms 117092 KB Time limit exceeded
17 Halted 0 ms 0 KB -