Submission #660326

#	Time	Username	Problem	Language	Result	Execution time	Memory
660326		Dec0Dedd	Information (CEOI08_information)	C++14	42 / 100	1095 ms	9580 KiB

information

#include <bits/stdc++.h>

using namespace std;

#define pii pair<int, int>

const int N = 2e3+1;
const int M = 1e6+1;

bool us[M], vis[N];
vector<pii> G[N];
vector<int> l, r;
int n, m;

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());

void dfs(int v) {
    vis[v]=true;

    shuffle(G[v].begin(), G[v].end(), rng);
    for (auto u : G[v]) {
        if (vis[u.first]) continue;
        us[u.second]=true; l.push_back(u.second);
        dfs(u.first);
    }
}

void dfs2(int v) {
    vis[v]=true;

    shuffle(G[v].begin(), G[v].end(), rng);
    for (auto u : G[v]) {
        if (vis[u.first] || us[u.second]) continue;
        r.push_back(u.second), dfs2(u.first);
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
    
    cin>>n>>m;
    for (int i=1; i<=m; ++i) {
        int a, b; cin>>a>>b;
        G[a].push_back({b, i});
    }

    int t=100, xr=0;
    while (t--) {
        memset(vis, false, sizeof(vis));
        dfs(1);
        memset(vis, false, sizeof(vis));
        dfs2(1);

        xr=max(xr, (int)r.size());
        if ((int)l.size() == n-1 && (int)r.size() == n-1) break;
        l.clear(), r.clear();
    }

    if ((int)l.size() < n-1 || (int)r.size() < n-1) cout<<"NONE\n";
    else {
        for (auto u : l) cout<<u<<" ";
        cout<<"\n";
        for (auto u : r) cout<<u<<" ";
        cout<<"\n";
    }
}

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