oj.uz

Submission #635460

# Submission time Handle Problem Language Result Execution time Memory
635460 2022-08-26T09:43:55 Z Markomafko972 Parking (CEOI22_parking) C++14
20 / 100
 142 ms 32580 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) {
			
		}
		
		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:190:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  190 |         for (int j = 0; j < tren.size(); j++) {
      |                         ~~^~~~~~~~~~~~~
Main.cpp:197:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  197 |         for (int abc = 0; abc < tren.size(); abc++) {
      |                           ~~~~^~~~~~~~~~~~~
Main.cpp:207:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  207 |             for (int j = 0; j < pravi[novi].size(); j++) {
      |                             ~~^~~~~~~~~~~~~~~~~~~~
Main.cpp:233:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  233 |     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 9 ms 15956 KB Output is correct
2 Correct 8 ms 15956 KB Output is correct
3 Correct 8 ms 15956 KB Output is correct
4 Correct 9 ms 15956 KB Output is correct
5 Correct 8 ms 15956 KB Output is correct
6 Correct 9 ms 15956 KB Output is correct
7 Correct 8 ms 15956 KB Output is correct
8 Correct 8 ms 15888 KB Output is correct
9 Correct 10 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 93 ms 28264 KB Output is correct
2 Correct 142 ms 30692 KB Output is correct
3 Correct 77 ms 25592 KB Output is correct
4 Correct 62 ms 24980 KB Output is correct
5 Correct 124 ms 30432 KB Output is correct

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 16084 KB Output is correct
2 Correct 9 ms 16044 KB Output is correct
3 Correct 9 ms 16060 KB Output is correct
4 Correct 11 ms 16084 KB Output is correct
5 Correct 9 ms 16084 KB Output is correct
6 Correct 9 ms 16044 KB Output is correct
7 Runtime error 23 ms 32580 KB Execution killed with signal 6
8 Halted 0 ms 0 KB -

Subtask #4
0.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 16084 KB Output is correct
2 Correct 9 ms 16044 KB Output is correct
3 Correct 9 ms 16060 KB Output is correct
4 Correct 11 ms 16084 KB Output is correct
5 Correct 9 ms 16084 KB Output is correct
6 Correct 9 ms 16044 KB Output is correct
7 Runtime error 23 ms 32580 KB Execution killed with signal 6
8 Halted 0 ms 0 KB -

Subtask #5
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 16156 KB Output is correct
2 Correct 10 ms 16204 KB Output is correct
3 Correct 9 ms 16084 KB Output is correct
4 Correct 10 ms 16084 KB Output is correct
5 Correct 8 ms 15956 KB Output is correct
6 Correct 9 ms 16088 KB Output is correct
7 Correct 8 ms 16128 KB Output is correct
8 Correct 9 ms 16084 KB Output is correct
9 Correct 9 ms 16128 KB Output is correct
10 Correct 10 ms 16072 KB Output is correct
11 Correct 9 ms 16084 KB Output is correct
12 Correct 9 ms 16084 KB Output is correct
13 Correct 9 ms 16084 KB Output is correct
14 Correct 9 ms 16108 KB Output is correct
15 Correct 10 ms 16052 KB Output is correct
16 Runtime error 24 ms 32508 KB Execution killed with signal 6
17 Halted 0 ms 0 KB -

Subtask #6
0.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 15956 KB Output is correct
2 Correct 8 ms 15956 KB Output is correct
3 Correct 8 ms 15956 KB Output is correct
4 Correct 9 ms 15956 KB Output is correct
5 Correct 8 ms 15956 KB Output is correct
6 Correct 9 ms 15956 KB Output is correct
7 Correct 8 ms 15956 KB Output is correct
8 Correct 8 ms 15888 KB Output is correct
9 Correct 10 ms 15956 KB Output is correct
10 Correct 8 ms 15956 KB Output is correct
11 Correct 93 ms 28264 KB Output is correct
12 Correct 142 ms 30692 KB Output is correct
13 Correct 77 ms 25592 KB Output is correct
14 Correct 62 ms 24980 KB Output is correct
15 Correct 124 ms 30432 KB Output is correct
16 Correct 9 ms 16084 KB Output is correct
17 Correct 9 ms 16044 KB Output is correct
18 Correct 9 ms 16060 KB Output is correct
19 Correct 11 ms 16084 KB Output is correct
20 Correct 9 ms 16084 KB Output is correct
21 Correct 9 ms 16044 KB Output is correct
22 Runtime error 23 ms 32580 KB Execution killed with signal 6
23 Halted 0 ms 0 KB -