oj.uz

Submission #635457

# Submission time Handle Problem Language Result Execution time Memory
635457 2022-08-26T09:42:44 Z Markomafko972 Parking (CEOI22_parking) C++14
20 / 100
 2000 ms 30784 KB 
#include <bits/stdc++.h>
#define X first
#define Y second
using namespace std;

int n, m, a, b, e, kol, kolg, jed, sol;
vector<int> v[200005];
int g[200005];
int bio[200005];
vector<int> pr;
int gdje[200005][5];
vector<int> smj[200005];
int ideu[200005];
set< pair<int, pair<int, int> > > s;
set< pair<int, pair<int, int> > > :: iterator it;
pair<int, int> pos[200005];
vector< pair<int, int> > out;
vector< pair<int, int> > tren;
int sam[200005];
int znak[200005];
int dalje[200005];
int dist[200005];
queue<int> q;

vector< pair< int, pair<int, int> > > svi;
vector<int> pravi[200005];
set< pair< pair<int, int>, pair<int, int> > > tocke;

void dfs(int x) {
    if (v[x].size() == 1) jed = 1;

    bio[x] = 1;
    kol++;
    if (g[x] == 2) {
        kolg++;
        s.insert({0, {1, x}});
    }
    else {
        s.insert({ideu[x], {0, x}});
    }

    for (int i = 0; i < v[x].size(); i++) {
        if (bio[v[x][i]] == 0) dfs(v[x][i]);
    }
}

void rek(int x) {
    bio[x] = 1;
    if (gdje[pos[x].X][0] == x && gdje[pos[x].Y][0] == x) tren.push_back({x, 1});
    else if (gdje[pos[x].X][1] == x && gdje[pos[x].Y][1] == x) tren.push_back({x, -1});
    else tren.push_back({x, 0});

    for (int i = 0; i < v[x].size(); i++) {
        if (bio[v[x][i]] == 0) rek(v[x][i]);
    }
}

void bfs() {
	
	while (!q.empty()) {
		int cvor = q.front();
		q.pop();
		
		for (int i = 0; i < v[cvor].size(); i++) {
			if (dist[v[cvor][i]] == -1) {
				dist[v[cvor][i]] = dist[cvor]+1;
				q.push(v[cvor][i]);
			}
		}
	}
	
}

int main() {

    ios_base::sync_with_stdio(false);
    cin.tie(0);

	memset(dist, -1, sizeof dist);
    cin >> n >> m;
    for (int i = 1; i <= n; i++) pos[i] = {-1, -1};

    for (int i = 0; i < m; i++) {
        cin >> a >> b;
        gdje[i][0] = a;
        gdje[i][1] = b;
        if (pos[a].X == -1) pos[a].X = i;
        else pos[a].Y = i;

        if (pos[b].X == -1) pos[b].X = i;
        else pos[b].Y = i;

        if (a == 0 && b == 0) {
            e++;
            pr.push_back(i);
        }
        else if (a != b && a > 0 && b > 0) {
            smj[a].push_back(b);
            ideu[a]++;
            v[a].push_back(b);
            v[b].push_back(a);
            g[b]++;
            pravi[b].push_back(a);
        }
        else if (b == 0) {
            if (sam[a] == 0) sam[a] = i+1;
            else {
                sol++;
                e++;
                out.push_back({i, sam[a]-1});
                pr.push_back(i);
            }
        }
    }

	for (int i = 1; i <= n; i++) {
        if (bio[i] == 0 && (int)v[i].size() > 0) {
            kol = 0, kolg = 0, jed = 0;
            s.clear();
            dfs(i);

            svi.push_back({1-jed, {kolg, i}});

            sol += kol+max(1, kolg);
        }
    }

    sort(svi.begin(), svi.end());
    memset(bio, 0, sizeof bio);
    for (int i = 0; i < svi.size(); i++) {
        if (svi[i].X == 0) {
            if (svi[i].Y.X > 0 && e < 1) {
                cout << -1;
                return 0;
            }

            if (svi[i].Y.X == 0) sol--;
            e++;
        }
        else {
            if ((svi[i].Y.X > 1 && e < 2) || e < 1) {
                cout << -1;
                return 0;
            }
        }

        tren.clear();
        rek(svi[i].Y.Y);
        int raz = 0;
        for (int j = 0; j < tren.size(); j++) {
            if (tren[j].Y != 0) raz++;
        }

        if (raz == 0 && svi[i].X == 1) {
            int wh = pos[svi[i].Y.Y].X;
            if (gdje[wh][0] != svi[i].Y.Y) wh = pos[svi[i].Y.Y].Y;

            out.push_back({wh, pr.back()});
            pravi[ smj[svi[i].Y.Y][0] ].clear();
            if (pos[ smj[svi[i].Y.Y][0] ].X == wh) pos[ smj[svi[i].Y.Y][0] ].X = pr.back();
            else pos[ smj[svi[i].Y.Y][0] ].Y = pr.back();
            smj[svi[i].Y.Y].clear();
        }
        
        for (int j = 0; j < tren.size(); j++) {
        	if ((int)smj[tren[j].X].size() == 0 && tren[j].Y == 0) {
        		q.push(tren[j].X);
        		dist[tren[j].X] = 0;
        		break;
			}
		}
		
		if (q.size() == 0) {
			for (int j = 0; j < tren.size(); j++) {
				if ((int)smj[tren[j].X].size() == 1 && tren[j].Y == 1) {
					q.push(tren[j].X);
					dist[tren[j].X] = 0;
					break;
				}
			}
		}
		
		if (q.size() == 0) {
			while(1) {
				
			}
		}
		
		bfs();
        
        tocke.clear();
        for (int j = 0; j < tren.size(); j++) {
        	//cout << tren[j].X << " " << (int)smj[tren[j].X].size() << " " << 1-tren[j].Y << endl;
        	znak[tren[j].X] = 1-tren[j].Y;
        	dalje[tren[j].X] = (int)smj[tren[j].X].size();
        	tocke.insert({{(int)smj[tren[j].X].size(), 1-tren[j].Y}, {dist[tren[j].X], tren[j].X}});
		}

        for (int abc = 0; abc < tren.size(); abc++) {
            int novi = -1, w = 0;
			
			pair< pair<int, int>, pair<int, int> > broj = *tocke.begin();
            tocke.erase(tocke.begin());
        	novi = broj.Y.Y;
            w = 1 - broj.X.Y;
            
            //cout << "reshi " << novi << " " << w << " " << pr.size() << endl;
            	
            for (int j = 0; j < pravi[novi].size(); j++) {
            	int susjed = pravi[novi][j];
            	if (tocke.find({{dalje[susjed], znak[susjed]}, {dist[susjed], susjed}}) != tocke.end()) {
					tocke.erase({{dalje[susjed], znak[susjed]}, {dist[susjed], susjed}});
            		dalje[susjed]--;
            		tocke.insert({{dalje[susjed], znak[susjed]}, {dist[susjed], susjed}});
            	}
			}

            if (w == -1) {
                out.push_back({pos[novi].X, pr.back()});
                out.push_back({pos[novi].Y, pr.back()});
                pr.pop_back();
            }
            else if (w == 1) {
                out.push_back({pos[novi].X, pos[novi].Y});
                pr.push_back(pos[novi].X);
            }
            else {
                if (gdje[ pos[novi].X ][0] == novi) out.push_back({pos[novi].Y, pos[novi].X});
                else out.push_back({pos[novi].X, pos[novi].Y});
            }
        }
    }

    cout << sol << "\n";
    for (int i = 0; i < out.size(); i++) cout << out[i].X+1 << " " << out[i].Y+1 << "\n";

    return 0;
}

Compilation message

Main.cpp: In function 'void dfs(int)':
Main.cpp:42:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |     for (int i = 0; i < v[x].size(); i++) {
      |                     ~~^~~~~~~~~~~~~
Main.cpp: In function 'void rek(int)':
Main.cpp:53:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |     for (int i = 0; i < v[x].size(); i++) {
      |                     ~~^~~~~~~~~~~~~
Main.cpp: In function 'void bfs()':
Main.cpp:64:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |   for (int i = 0; i < v[cvor].size(); i++) {
      |                   ~~^~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:130:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  130 |     for (int i = 0; i < svi.size(); i++) {
      |                     ~~^~~~~~~~~~~~
Main.cpp:150:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  150 |         for (int j = 0; j < tren.size(); j++) {
      |                         ~~^~~~~~~~~~~~~
Main.cpp:165:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  165 |         for (int j = 0; j < tren.size(); j++) {
      |                         ~~^~~~~~~~~~~~~
Main.cpp:174:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  174 |    for (int j = 0; j < tren.size(); j++) {
      |                    ~~^~~~~~~~~~~~~
Main.cpp:192:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  192 |         for (int j = 0; j < tren.size(); j++) {
      |                         ~~^~~~~~~~~~~~~
Main.cpp:199:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  199 |         for (int abc = 0; abc < tren.size(); abc++) {
      |                           ~~~~^~~~~~~~~~~~~
Main.cpp:209:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  209 |             for (int j = 0; j < pravi[novi].size(); j++) {
      |                             ~~^~~~~~~~~~~~~~~~~~~~
Main.cpp:235:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  235 |     for (int i = 0; i < out.size(); i++) cout << out[i].X+1 << " " << out[i].Y+1 << "\n";
      |                     ~~^~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 15956 KB Output is correct
2 Correct 8 ms 15956 KB Output is correct
3 Correct 8 ms 16004 KB Output is correct
4 Correct 8 ms 15956 KB Output is correct
5 Correct 8 ms 15924 KB Output is correct
6 Correct 8 ms 16000 KB Output is correct
7 Correct 8 ms 15956 KB Output is correct
8 Correct 8 ms 16008 KB Output is correct
9 Correct 9 ms 15956 KB Output is correct
10 Correct 8 ms 15956 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 95 ms 28508 KB Output is correct
2 Correct 130 ms 30784 KB Output is correct
3 Correct 67 ms 25640 KB Output is correct
4 Correct 61 ms 25140 KB Output is correct
5 Correct 119 ms 30528 KB Output is correct

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2068 ms 16084 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0.0 / 15.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2068 ms 16084 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2078 ms 16156 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 15956 KB Output is correct
2 Correct 8 ms 15956 KB Output is correct
3 Correct 8 ms 16004 KB Output is correct
4 Correct 8 ms 15956 KB Output is correct
5 Correct 8 ms 15924 KB Output is correct
6 Correct 8 ms 16000 KB Output is correct
7 Correct 8 ms 15956 KB Output is correct
8 Correct 8 ms 16008 KB Output is correct
9 Correct 9 ms 15956 KB Output is correct
10 Correct 8 ms 15956 KB Output is correct
11 Correct 95 ms 28508 KB Output is correct
12 Correct 130 ms 30784 KB Output is correct
13 Correct 67 ms 25640 KB Output is correct
14 Correct 61 ms 25140 KB Output is correct
15 Correct 119 ms 30528 KB Output is correct
16 Execution timed out 2068 ms 16084 KB Time limit exceeded
17 Halted 0 ms 0 KB -