제출 #660323

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
660323		Dec0Dedd	Information (CEOI08_information)	C++14	42 / 100	445 ms	19100 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;

void dfs(int v) {
    vis[v]=true;
    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;
    for (auto u : G[v]) {
        if (vis[u.first] || us[u.second]) continue;
        r.push_back(u.second), dfs2(u.first);
    }
}

int main() {
    cin>>n>>m;
    for (int i=1; i<=m; ++i) {
        int a, b; cin>>a>>b;
        G[a].push_back({b, i});
    } dfs(1);
    memset(vis, false, sizeof(vis));
    dfs2(1);

    if ((int)l.size() < n-1 || (int)r.size() < n-1) cout<<-1<<"\n";
    else {
        for (auto u : l) cout<<u<<" ";
        cout<<"\n";
        for (auto u : r) cout<<u<<" ";
        cout<<"\n";
    }
}

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