oj.uz

Submission #564132

# Submission time Handle Problem Language Result Execution time Memory
564132 2022-05-18T15:25:24 Z piOOE Potemkin cycle (CEOI15_indcyc) C++17
100 / 100
 322 ms 172564 KB 
#include <bits/stdc++.h>

using namespace std;

#define all(x) begin(x), end(x)
#define sz(x) ((int)size(x))
#define trace(x) cout << #x << ": " << (x) << endl;

typedef long long ll;

const int N = 1000, M = 100000;


int A[M], B[M], C[2][M];

bool e[N][N];
vector<pair<int, int>> adj[N];
vector<pair<int, int>> g[2][M];

vector<int> st;

int used[2][M];

void dfs(int t, int v, pair<int, int> p) {
    used[t][v] = 1;
    st.emplace_back(C[t][v]);
    for (auto to: g[t][v]) {
        if (to != p) {
            if (used[to.first][to.second] == 1) {
                cout << C[to.first][to.second] + 1 << " ";
                int lst = C[to.first][to.second];
                int wow = 0;
                while (true) {
                    auto u = st.back();
                    cout << u + 1 << " ";
                    if (wow && e[u][lst]) {
                        break;
                    }
                    ++wow;
                    st.pop_back();
                }
                exit(0);
            }
        }
    }
    for (auto to: g[t][v]) {
        if (to != p) {
            if (!used[to.first][to.second]) {
                dfs(to.first, to.second, {t, v});
            }
        }
    }
    used[t][v] = 2;
    st.pop_back();
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, r;
    cin >> n >> r;
    for (int i = 0; i < r; ++i) {
        cin >> A[i] >> B[i];
        --A[i], --B[i];
        C[0][i] = A[i];
        C[1][i] = B[i];
        adj[A[i]].emplace_back(B[i], i);
        adj[B[i]].emplace_back(A[i], i);
        e[A[i]][B[i]] = e[B[i]][A[i]] = true;
    }
    for (int v = 0; v < n; ++v) {
        for (auto [a, i]: adj[v]) {
            for (auto [b, j]: adj[v]) {
                if (i != j && !e[a][b]) {
                    int t1 = (B[i] == a);
                    int t2 = (B[j] == v);
                    g[t1][i].emplace_back(t2, j);
                }
            }
        }
    }
    for (int v = 0; v < r; ++v) {
        if (!used[0][v]) {
            dfs(0, v, {-1, -1});
        }
        if (!used[1][v]) {
            dfs(1, v, {-1, -1});
        }
    }
    cout << "no";
    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 3 ms 5076 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 2 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5076 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 5076 KB Output is correct
2 Correct 2 ms 5000 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5204 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5588 KB Output is correct
2 Correct 4 ms 5760 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 5828 KB Output is correct
2 Correct 7 ms 5844 KB Output is correct
3 Correct 15 ms 9572 KB Output is correct
4 Correct 14 ms 9684 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 8276 KB Output is correct
2 Correct 11 ms 8532 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 99 ms 36148 KB Output is correct
2 Correct 26 ms 12192 KB Output is correct
3 Correct 105 ms 36288 KB Output is correct
4 Correct 42 ms 12240 KB Output is correct

Subtask #9
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 135 ms 95180 KB Output is correct
2 Correct 162 ms 103328 KB Output is correct

Subtask #10
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 115 ms 9720 KB Output is correct
2 Correct 111 ms 9632 KB Output is correct
3 Correct 284 ms 172496 KB Output is correct
4 Correct 322 ms 172564 KB Output is correct