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Submission #245246

# Submission time Handle Problem Language Result Execution time Memory
245246 2020-07-05T20:16:06 Z thecodingwizard Potemkin cycle (CEOI15_indcyc) C++11
100 / 100
 273 ms 91512 KB 
#include <bits/stdc++.h>

using namespace std;

#define vi vector<int>
#define ii pair<int, int>
#define f first
#define s second
#define vii vector<ii>

vii adj[1000];
bool conn[1000][1000];
ii edges[200000];
vi adj2[200000];
bool vis[200000], active[200000];

vector<int> S;
void dfs(int u, int p) {
    if (active[u]) {
        while (true) {
            int x = S.back(); S.pop_back();
            cout << edges[x].s+1 << " ";
            if (x == u) break;
        }
        cout << endl;
        exit(0);
    }
    if (vis[u]) return;
    vis[u] = true;
    active[u] = true;
    S.push_back(u);
    for (auto v : adj2[u]) {
        if (v != p) dfs(v, u);
    }
    S.pop_back();
    active[u] = false;
}

int main() {
    int n, r; cin >> n >> r;
    for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) conn[i][j] = false;

    for (int i = 0; i < r; i++) {
        int a, b; cin >> a >> b; --a; --b;
        conn[a][b] = true;
        conn[b][a] = true;
        edges[2*i] = {a,b};
        edges[2*i+1] = {b,a};
        adj[a].push_back({b,2*i});
        adj[b].push_back({a,2*i+1});
    }

    for (int i = 0; i < 2*r; i++) {
        vis[i] = active[i] = false;
        int a = edges[i].f, b = edges[i].s;
        for (auto v : adj[b]) {
            if (v.f == a || conn[a][v.f]) continue;
            adj2[i].push_back(v.s);
        }
    }

    for (int i = 0; i < 2*r; i++) {
        if (!vis[i]) dfs(i, i);
    }
    cout << "no" << endl;

    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 7 ms 4992 KB Output is correct
3 Correct 7 ms 4992 KB Output is correct
4 Correct 7 ms 4992 KB Output is correct
5 Correct 7 ms 4992 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5060 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 7 ms 5120 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 5248 KB Output is correct

Subtask #5
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 5376 KB Output is correct
2 Correct 10 ms 5504 KB Output is correct

Subtask #6
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 5760 KB Output is correct
2 Correct 11 ms 5760 KB Output is correct
3 Correct 17 ms 7680 KB Output is correct
4 Correct 19 ms 7680 KB Output is correct

Subtask #7
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 6960 KB Output is correct
2 Correct 15 ms 7040 KB Output is correct

Subtask #8
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 107 ms 22776 KB Output is correct
2 Correct 40 ms 9872 KB Output is correct
3 Correct 122 ms 22776 KB Output is correct
4 Correct 41 ms 9848 KB Output is correct

Subtask #9
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 93 ms 51256 KB Output is correct
2 Correct 131 ms 55288 KB Output is correct

Subtask #10
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 174 ms 9720 KB Output is correct
2 Correct 165 ms 10008 KB Output is correct
3 Correct 218 ms 91512 KB Output is correct
4 Correct 273 ms 91512 KB Output is correct