oj.uz

답안 #955488

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
955488 2024-03-30T14:54:54 Z yoav_s Newspapers (CEOI21_newspapers) C++17
0 / 100
 1000 ms 852 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef vector<ll> v;
typedef vector<v> vv;
typedef vector<vv> vvv;
typedef pair<ll,ll> p;
typedef vector<p> vp;
typedef vector<vp> vvp;
typedef vector<vvp> vvvp;
typedef pair<ll, p> tri;
typedef vector<tri> vtri;
typedef vector<vtri> vvtri;
typedef vector<vvtri> vvvtri;
typedef vector<bool> vb;
typedef vector<vb> vvb;
typedef vector<vvb> vvvb;

#define f first
#define s second
#define pb push_back
#define eb emplace_back
#define all(v) (v).begin(),(v).end()

const ll INF = 1e18;
const ll mod = 1e9 + 7;

bool eulerTour(ll i, v &visited, vv &graph, v &res, ll &uniqCount, ll nonLeafCount)
{
    res.pb(i);
    visited[i]++;
    uniqCount++;

    for (ll x : graph[i])
    {
        if (visited[x] == 0 && graph[x].size() > 1)
        {
            bool poss = eulerTour(x,visited,graph,res,uniqCount, nonLeafCount);
            if (!poss) return false;
            if (uniqCount < nonLeafCount)
            {
                res.pb(i);
                visited[i]++;
                if (visited[i] >= 3) return false;
            }
        }
    }
    return true;
}

int main()
{
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    ll N, M;
    cin >> N >> M;
    vv graph(N);
    for (ll i=  0; i < M; i++)
    {
        ll a, b;
        cin >> a >> b;
        graph[a-1].pb(b-1);
        graph[b-1].pb(a-1);
    }
    if (M != N - 1)
    {
        cout << "NO\n";
        return 0;
    }
    //theory - find euler tour, check if visiting a vertex thrice (at least). if yes, then NO. otherwise check if works. if not, repeat twice
    if (N == 1)
    {
        cout << "YES\n1\n1\n";
        return 0;
    }
    if (N == 2)
    {
        cout << "YES\n2\n1 1\n";
        return 0;
    }
    ll mini = INF;
    v minTour;
    for (ll i=  0; i < N; i++)
    {
        if (graph[i].size() == 1) continue;
        ll cnt = 0;
        v visited(N, 0);
        v tour;
        ll nonLeafCount = 0;
        for (auto x : graph) if (x.size() != 1) nonLeafCount++;
        if (eulerTour(i, visited, graph, tour, cnt, nonLeafCount))
        {
            vb available(N, true);
            bool poss = true;
            for (ll x : tour)
            {
                available[x] = false;
                vb newGeneration(N, false);
                for (ll i = 0 ;i < N; i++) if (available[i]) for (ll x : graph[i]) newGeneration[x] = true;
                available = newGeneration;
            }
            for (ll i = 0; i < N; i++) if (available[i]) poss = false;
            
            if (!poss)
            {
                v newTour1;
                for (ll x : tour) newTour1.pb(x);
                for (ll x : tour) newTour1.pb(x);
                
                poss = true;
                available = vb(N, true);
                for (ll x : newTour1)
                {
                    available[x] = false;
                    vb newGeneration(N, false);
                    for (ll i = 0 ;i < N; i++) if (available[i]) for (ll x : graph[i]) newGeneration[x] = true;
                    available = newGeneration;
                }
                for (ll i = 0; i < N; i++) if (available[i]) poss = false;
                if (poss) tour = newTour1;
                else
                {
                    v newTour2;
                    for (ll x : tour) newTour2.pb(x);
                    for (ll i = tour.size() - 1; i >= 0; i--) newTour2.pb(tour[i]);
                    poss = true;
                    available = vb(N, true);
                    for (ll x : newTour2)
                    {
                        available[x] = false;
                        vb newGeneration(N, false);
                        for (ll i = 0 ;i < N; i++) if (available[i]) for (ll x : graph[i]) newGeneration[x] = true;
                        available = newGeneration;
                    }
                    for (ll i = 0; i < N; i++) if (available[i]) poss = false;
                    if (poss) tour = newTour2;
                }
            }
            if (poss)
            {
                mini = tour.size();
                minTour = tour;
            }
        }
    }
    if (mini == INF)
    {
        cout << "NO\n"; return 0;
    }
    cout << "YES\n";
    cout << mini << "\n";
    for (ll x : minTour) cout << x + 1 << " ";
    cout << "\n";
    return 0;
}

Subtask #1
0.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Incorrect 0 ms 348 KB Output isn't correct
11 Halted 0 ms 0 KB -

Subtask #2
0.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Execution timed out 1046 ms 852 KB Time limit exceeded
12 Halted 0 ms 0 KB -

Subtask #3
0.0 / 80.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Incorrect 0 ms 348 KB Output isn't correct
11 Halted 0 ms 0 KB -