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답안 #789688

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
789688 2023-07-21T19:01:55 Z benjaminkleyn 늑대인간 (IOI18_werewolf) C++17
15 / 100
 4000 ms 85808 KB 
#include "werewolf.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

vector<int> g[200000];

int e[200000];
int par1[200000][20], par2[200000][20];
int find(int u)
{
    return e[u] == u ? u : e[u] = find(e[u]);
}

bool vis1[200000] = {false}, vis2[200000] = {false};
int euler1[200000], euler2[200000];
int in1[200000], out1[200000], t1 = 0;
int in2[200000], out2[200000], t2 = 0;
vector<int> c1[200000], c2[200000];
void dfs1(int u)
{
    vis1[u] = true;
    in1[u] = t1++;
    for (int v : c1[u])
        if (!vis1[v])
            dfs1(v);
    out1[u] = t1;
}
void dfs2(int u)
{
    vis2[u] = true;
    in2[u] = t2++;
    for (int v : c2[u])
        if (!vis2[v])
            dfs2(v);
    out2[u] = t2;
}

const int BS = 1000;
struct Query
{
    int l1, r1, l2, r2, t;
};
bool operator<(const Query &A, const Query &B)
{
    return A.l1 / BS < B.l1 / BS || (A.l1 / BS == B.l1 / BS && A.r1 < B.r1);
}

int t[800000] = {0};
void update(int v, int tl, int tr, int idx, int val)
{
    if (idx < tl || tr < idx)
        return;
    if (tl == tr)
    {
        t[v] += val;
        return;
    }
    int tm = (tl + tr) / 2;
    update(2 * v, tl, tm, idx, val);
    update(2 * v + 1, tm + 1, tr, idx, val);
    t[v] = (t[2 * v] > 0) || (t[2 * v + 1] > 0);
}
int query(int v, int tl, int tr, int l, int r)
{
    if (r < tl || tr < l)
        return 0;
    if (l <= tl && tr <= r)
        return t[v];
    int tm = (tl + tr) / 2;
    return (query(2 * v, tl, tm, l, r) > 0) || (query(2 * v + 1, tm + 1, tr, l, r) > 0);
}

vector<int> check_validity(int N, vector<int> X, vector<int> Y, vector<int> S, vector<int> E, vector<int> L, vector<int> R)
{
    int Q = S.size(), M = X.size();
    vector<int> A(Q, 0);

    for (int i = 0; i < N; i++)
        par1[i][0] = par2[i][0] = i;

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

    for (int i = 0; i < N; i++)
        e[i] = i;

    for (int u = 0; u < N; u++)
        for (int v : g[u])
            if (v < u)
            {
                v = find(v);
                e[v] = u;
                par1[v][0] = u;
            }

    for (int i = 0; i < N; i++)
        e[i] = i;

    for (int u = N - 1; u >= 0; u--)
        for (int v : g[u])
            if (v > u)
            {
                v = find(v);
                e[v] = u;
                par2[v][0] = u;
            }

    for (int k = 1; k < 20; k++)
        for (int u = 0; u < N; u++)
        {
            par1[u][k] = par1[par1[u][k-1]][k-1];
            par2[u][k] = par2[par2[u][k-1]][k-1];
        }

    for (int i = 0; i < N; i++)
    {
        c1[par1[i][0]].push_back(i);
        c2[par2[i][0]].push_back(i);
    }

    for (int i = N - 1; i >= 0; i--)
        if (!vis1[i])
            dfs1(i);

    for (int i = 0; i < N; i++)
        if (!vis2[i])
            dfs2(i);

    /*
    for (int i = 0; i < N; i++)
        cout << par1[i][0] << ' ';
    cout << '\n';

    for (int i = 0; i < N; i++)
        cout << par2[i][0] << ' ';
    cout << '\n';

    for (int i = 0; i < N; i++)
        cout << in1[i] << ' ';
    cout << '\n';

    for (int i = 0; i < N; i++)
        cout << in2[i] << ' ';
    cout << '\n';
    */

    vector<Query> queries(Q);
    for (int i = 0; i < Q; i++)
    {
        for (int k = 19; k >= 0; k--)
        {
            if (par1[E[i]][k] <= R[i])
                E[i] = par1[E[i]][k];
            if (par2[S[i]][k] >= L[i])
                S[i] = par2[S[i]][k];
        }
        queries[i] = {in1[E[i]], out1[E[i]]-1, in2[S[i]], out2[S[i]]-1, i};
    }

    for (int i = 0; i < N; i++)
    {
        euler1[in1[i]] = i;
        euler2[in2[i]] = i;
    }

    sort(queries.begin(), queries.end());
    int l = 0, r = -1;
    for (auto [l1, r1, l2, r2, t] : queries)
    {
        while (r < r1)
            update(1, 0, N - 1, in2[euler1[++r]], 1);
        while (l > l1)
            update(1, 0, N - 1, in2[euler1[--l]], 1);
        while (r > r1)
            update(1, 0, N - 1, in2[euler1[r--]], -1);
        while (l < l1)
            update(1, 0, N - 1, in2[euler1[l++]], -1);
        A[t] = query(1, 0, N - 1, l2, r2);
    }

    return A;
}

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 14420 KB Output is correct
2 Correct 6 ms 14420 KB Output is correct
3 Correct 6 ms 14420 KB Output is correct
4 Correct 6 ms 14420 KB Output is correct
5 Correct 7 ms 14472 KB Output is correct
6 Correct 7 ms 14420 KB Output is correct
7 Correct 6 ms 14420 KB Output is correct
8 Correct 7 ms 14420 KB Output is correct
9 Correct 6 ms 14420 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 14420 KB Output is correct
2 Correct 6 ms 14420 KB Output is correct
3 Correct 6 ms 14420 KB Output is correct
4 Correct 6 ms 14420 KB Output is correct
5 Correct 7 ms 14472 KB Output is correct
6 Correct 7 ms 14420 KB Output is correct
7 Correct 6 ms 14420 KB Output is correct
8 Correct 7 ms 14420 KB Output is correct
9 Correct 6 ms 14420 KB Output is correct
10 Correct 74 ms 15496 KB Output is correct
11 Correct 56 ms 15444 KB Output is correct
12 Correct 20 ms 15444 KB Output is correct
13 Correct 125 ms 15628 KB Output is correct
14 Correct 109 ms 15616 KB Output is correct
15 Correct 26 ms 15572 KB Output is correct

Subtask #3
0 / 34.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1455 ms 82356 KB Output is correct
2 Correct 1204 ms 85808 KB Output is correct
3 Correct 2712 ms 83504 KB Output is correct
4 Correct 3695 ms 82476 KB Output is correct
5 Correct 3966 ms 83240 KB Output is correct
6 Execution timed out 4043 ms 83148 KB Time limit exceeded
7 Halted 0 ms 0 KB -

Subtask #4
0 / 51.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 14420 KB Output is correct
2 Correct 6 ms 14420 KB Output is correct
3 Correct 6 ms 14420 KB Output is correct
4 Correct 6 ms 14420 KB Output is correct
5 Correct 7 ms 14472 KB Output is correct
6 Correct 7 ms 14420 KB Output is correct
7 Correct 6 ms 14420 KB Output is correct
8 Correct 7 ms 14420 KB Output is correct
9 Correct 6 ms 14420 KB Output is correct
10 Correct 74 ms 15496 KB Output is correct
11 Correct 56 ms 15444 KB Output is correct
12 Correct 20 ms 15444 KB Output is correct
13 Correct 125 ms 15628 KB Output is correct
14 Correct 109 ms 15616 KB Output is correct
15 Correct 26 ms 15572 KB Output is correct
16 Correct 1455 ms 82356 KB Output is correct
17 Correct 1204 ms 85808 KB Output is correct
18 Correct 2712 ms 83504 KB Output is correct
19 Correct 3695 ms 82476 KB Output is correct
20 Correct 3966 ms 83240 KB Output is correct
21 Execution timed out 4043 ms 83148 KB Time limit exceeded
22 Halted 0 ms 0 KB -