oj.uz

Submission #832334

# Submission time Handle Problem Language Result Execution time Memory
832334 2023-08-21T09:13:29 Z finn__ Toy Train (IOI17_train) C++17
16 / 100
 9 ms 2004 KB 
#include "train.h"
#include <bits/stdc++.h>
using namespace std;

constexpr size_t N = 5000;

vector<int> g[N], rg[N], postorder, scc[N];
bitset<N> visited, is_charging, f;
int ind[N];

void postorder_dfs(int u)
{
    visited[u] = 1;
    for (auto const &v : g[u])
        if (!visited[v])
            postorder_dfs(v);
    postorder.push_back(u);
}

void find_scc(int u, size_t s)
{
    visited[u] = 1;
    scc[s].push_back(u);
    ind[u] = s;
    for (auto const &v : rg[u])
        if (!visited[v])
            find_scc(v, s);
}

vector<int> who_wins(vector<int> a, vector<int> r, vector<int> u, vector<int> v)
{
    size_t const n = a.size(), m = u.size();
    int subtask = 1;
    for (size_t i = 0; i < m; ++i)
        if (u[i] != v[i] && u[i] + 1 != v[i])
        {
            subtask = 3;
            break;
        }

    vector<int> w(n);

    if (subtask == 1)
    {
        vector<bool> has_edge(n), has_loop(n);
        for (size_t i = 0; i < m; ++i)
        {
            if (u[i] == v[i])
                has_loop[u[i]] = 1;
            else
                has_edge[u[i]] = 1;
        }

        for (size_t i = 0; i < n; ++i)
        {
            for (size_t j = i; j < n; ++j)
                if (has_loop[j])
                {
                    if (!(a[j] ^ r[j]))
                    {
                        w[i] = a[j];
                        break;
                    }
                    if (!has_edge[j])
                    {
                        w[i] = !a[j];
                        break;
                    }
                }
        }

        return w;
    }

    for (size_t i = 0; i < n; ++i)
        is_charging[i] = r[i];
    for (size_t i = 0; i < m; ++i)
        g[u[i]].push_back(v[i]), rg[v[i]].push_back(u[i]);

    for (size_t i = 0; i < n; ++i)
        if (!visited[i])
            postorder_dfs(i);
    visited.reset();
    size_t s = 0;
    for (auto it = postorder.rbegin(); it != postorder.rend(); ++it)
        if (!visited[*it])
        {
            find_scc(*it, s++);
        }

    for (int &x : a)
        if (!x)
        {
            subtask = 4;
            break;
        }

    if (subtask == 3)
    {
        for (size_t i = 0; i < s; ++i)
        {
            bool has_charging_node = 0;
            for (int u : scc[i])
                has_charging_node |= r[u];
            bool has_cycle = scc[i].size() > 1;
            for (int u : scc[i])
                for (int v : g[u])
                    has_cycle |= u == v;
            if (has_cycle && has_charging_node)
            {
                f[i] = 1;
            }
        }

        for (size_t i = s - 1; i < s; --i)
            if (f[i])
            {
                for (auto const u : scc[i])
                    for (auto const &v : rg[u])
                        f[ind[v]] = 1;
            }

        for (size_t i = 0; i < n; ++i)
            w[i] = f[ind[i]];
    }
    else
    {
    }

    return w;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 748 KB Output is correct
2 Correct 3 ms 852 KB Output is correct
3 Correct 3 ms 852 KB Output is correct
4 Correct 3 ms 852 KB Output is correct
5 Correct 3 ms 852 KB Output is correct
6 Correct 4 ms 852 KB Output is correct
7 Correct 2 ms 852 KB Output is correct
8 Correct 2 ms 852 KB Output is correct
9 Correct 2 ms 852 KB Output is correct
10 Correct 2 ms 852 KB Output is correct
11 Correct 2 ms 724 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 596 KB 3rd lines differ - on the 2nd token, expected: '1', found: '0'
2 Halted 0 ms 0 KB -

Subtask #3
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 1876 KB Output is correct
2 Correct 5 ms 1748 KB Output is correct
3 Correct 5 ms 1748 KB Output is correct
4 Correct 7 ms 1748 KB Output is correct
5 Correct 7 ms 1832 KB Output is correct
6 Correct 9 ms 1748 KB Output is correct
7 Correct 6 ms 1748 KB Output is correct
8 Correct 6 ms 1748 KB Output is correct
9 Correct 7 ms 1748 KB Output is correct
10 Correct 7 ms 1740 KB Output is correct
11 Correct 6 ms 1620 KB Output is correct
12 Correct 6 ms 1696 KB Output is correct
13 Correct 7 ms 1876 KB Output is correct
14 Correct 7 ms 1948 KB Output is correct
15 Correct 6 ms 2004 KB Output is correct
16 Correct 7 ms 1876 KB Output is correct
17 Correct 7 ms 1956 KB Output is correct
18 Correct 4 ms 1572 KB Output is correct

Subtask #4
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 8 ms 1492 KB 3rd lines differ - on the 1st token, expected: '1', found: '0'
2 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 6 ms 1620 KB 3rd lines differ - on the 1st token, expected: '1', found: '0'
2 Halted 0 ms 0 KB -

Subtask #6
0 / 51.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 748 KB Output is correct
2 Correct 3 ms 852 KB Output is correct
3 Correct 3 ms 852 KB Output is correct
4 Correct 3 ms 852 KB Output is correct
5 Correct 3 ms 852 KB Output is correct
6 Correct 4 ms 852 KB Output is correct
7 Correct 2 ms 852 KB Output is correct
8 Correct 2 ms 852 KB Output is correct
9 Correct 2 ms 852 KB Output is correct
10 Correct 2 ms 852 KB Output is correct
11 Correct 2 ms 724 KB Output is correct
12 Incorrect 0 ms 596 KB 3rd lines differ - on the 2nd token, expected: '1', found: '0'
13 Halted 0 ms 0 KB -