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Submission #692544

# Submission time Handle Problem Language Result Execution time Memory
692544 2023-02-01T20:35:19 Z finn__ One-Way Streets (CEOI17_oneway) C++17
100 / 100
 68 ms 14032 KB 
#include <bits/stdc++.h>
using namespace std;

struct Edge
{
    unsigned v, i;
    bool as_given;

    Edge(unsigned v_, unsigned i_, bool as_given_)
    {
        v = v_, i = i_, as_given = as_given_;
    }
};

vector<vector<Edge>> g;
vector<int> r;
vector<unsigned> y, l;
vector<bool> visited;
string orientation;

unsigned orient_edges(unsigned u, Edge p = Edge(-1, -1, 0), unsigned i = 0)
{
    visited[u] = 1;
    y[u] = l[u] = i++;

    for (Edge const &e : g[u])
    {
        if (!visited[e.v])
        {
            i = orient_edges(e.v, e, i);
            r[u] += r[e.v];
            l[u] = min(l[u], l[e.v]);
        }

        if (e.i != p.i)
        {
            if (l[e.v] > y[u] && r[e.v])
                orientation[e.i] = ((r[e.v] > 0) ^ !e.as_given) ? 'L' : 'R';
            else
                orientation[e.i] = 'B';

            l[u] = min(l[u], y[e.v]);
        }
    }

    return i;
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    size_t n, m;
    cin >> n >> m;

    g = vector<vector<Edge>>(n);
    r = vector<int>(n, 0);
    y = vector<unsigned>(n);
    l = vector<unsigned>(n);
    visited = vector<bool>(n, 0);
    orientation.resize(m);

    for (unsigned i = 0; i < m; i++)
    {
        unsigned u, v;
        cin >> u >> v;
        g[u - 1].emplace_back(v - 1, i, 1);
        g[v - 1].emplace_back(u - 1, i, 0);
    }

    size_t p;
    cin >> p;

    for (size_t i = 0; i < p; i++)
    {
        unsigned u, v;
        cin >> u >> v;
        r[u - 1]++;
        r[v - 1]--;
    }

    for (unsigned i = 0; i < n; i++)
        if (!visited[i])
            orient_edges(i);

    cout << orientation << '\n';
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 272 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 320 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 328 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 320 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 272 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 320 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 328 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 320 KB Output is correct
11 Correct 35 ms 7024 KB Output is correct
12 Correct 33 ms 8136 KB Output is correct
13 Correct 38 ms 9284 KB Output is correct
14 Correct 45 ms 10444 KB Output is correct
15 Correct 46 ms 10708 KB Output is correct
16 Correct 48 ms 9508 KB Output is correct
17 Correct 38 ms 10412 KB Output is correct
18 Correct 40 ms 9324 KB Output is correct
19 Correct 40 ms 11392 KB Output is correct
20 Correct 33 ms 8012 KB Output is correct
21 Correct 30 ms 7748 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 272 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 320 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 328 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 320 KB Output is correct
11 Correct 35 ms 7024 KB Output is correct
12 Correct 33 ms 8136 KB Output is correct
13 Correct 38 ms 9284 KB Output is correct
14 Correct 45 ms 10444 KB Output is correct
15 Correct 46 ms 10708 KB Output is correct
16 Correct 48 ms 9508 KB Output is correct
17 Correct 38 ms 10412 KB Output is correct
18 Correct 40 ms 9324 KB Output is correct
19 Correct 40 ms 11392 KB Output is correct
20 Correct 33 ms 8012 KB Output is correct
21 Correct 30 ms 7748 KB Output is correct
22 Correct 54 ms 11596 KB Output is correct
23 Correct 56 ms 10432 KB Output is correct
24 Correct 68 ms 10556 KB Output is correct
25 Correct 56 ms 14032 KB Output is correct
26 Correct 50 ms 11332 KB Output is correct
27 Correct 51 ms 10408 KB Output is correct
28 Correct 23 ms 4692 KB Output is correct
29 Correct 53 ms 8836 KB Output is correct
30 Correct 48 ms 8840 KB Output is correct
31 Correct 48 ms 9224 KB Output is correct
32 Correct 45 ms 10884 KB Output is correct