oj.uz

Submission #634476

# Submission time Handle Problem Language Result Execution time Memory
634476 2022-08-24T13:16:19 Z Markomafko972 Parking (CEOI22_parking) C++14
20 / 100
 130 ms 30932 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];

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

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]);
    }
}

int main() {

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

    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();
        }
        
        s.clear();
        for (int j = 0; j < tren.size(); j++) {
        	znak[tren[j].X] = 1-tren[j].Y;
        	dalje[tren[j].X] = (int)smj[tren[j].X].size();
        	s.insert({(int)smj[tren[j].X].size(), {1-tren[j].Y, tren[j].X}});
		}

        for (int abc = 0; abc < tren.size(); abc++) {
            int novi = -1, w = 0;
			
			pair<int, pair<int, int> > broj = *s.begin();
			
			if (broj.X != 0) {
				while (1) {
					
				}
			}
			
            s.erase(s.begin());
        	novi = broj.Y.Y;
            w = 1 - broj.Y.X;
            	
            for (int j = 0; j < pravi[novi].size(); j++) {
            	int susjed = pravi[novi][j];
            	if (s.find({dalje[susjed], {znak[susjed], susjed}}) != s.end()) {
					s.erase({dalje[susjed], {znak[susjed], susjed}});
            		dalje[susjed]--;
            		s.insert({dalje[susjed], {znak[susjed], susjed}});
            	}
            	else {
            		while (1) {
            			
					}
				}
			}
			
            /*for (int j = 0; j < tren.size(); j++) {
                if (bio[tren[j].X] == 2) continue;
                int koll = 0, k2 = 0;
                if (smj[tren[j].X].size() > 0 && bio[smj[tren[j].X][0]] != 2) {
                    koll++;
                    if (g[smj[tren[j].X][0]] == 2) k2++;
                }
                if (smj[tren[j].X].size() > 1 && bio[smj[tren[j].X][1]] != 2) {
                    koll++;
                    if (g[smj[tren[j].X][1]] == 2) k2++;
                }

                if (koll == 0 && tren[j].Y >= 0 && k2 == 0) {
                    novi = tren[j].X;
                    w = tren[j].Y;
                    break;
                }

                if (koll == 0) {
                    novi = tren[j].X;
                    w = tren[j].Y;
                }
            }

            bio[novi] = 2;*/

            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:39:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |     for (int i = 0; i < v[x].size(); i++) {
      |                     ~~^~~~~~~~~~~~~
Main.cpp: In function 'void rek(int)':
Main.cpp:50:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |     for (int i = 0; i < v[x].size(); i++) {
      |                     ~~^~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:110:23: 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]
  110 |     for (int i = 0; i < svi.size(); i++) {
      |                     ~~^~~~~~~~~~~~
Main.cpp:130:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  130 |         for (int j = 0; j < tren.size(); j++) {
      |                         ~~^~~~~~~~~~~~~
Main.cpp:146:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  146 |         for (int j = 0; j < tren.size(); j++) {
      |                         ~~^~~~~~~~~~~~~
Main.cpp:152:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  152 |         for (int abc = 0; abc < tren.size(); abc++) {
      |                           ~~~~^~~~~~~~~~~~~
Main.cpp:167:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  167 |             for (int j = 0; j < pravi[novi].size(); j++) {
      |                             ~~^~~~~~~~~~~~~~~~~~~~
Main.cpp:224:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  224 |     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 7 ms 15188 KB Output is correct
2 Correct 7 ms 15188 KB Output is correct
3 Correct 7 ms 15188 KB Output is correct
4 Correct 7 ms 15188 KB Output is correct
5 Correct 8 ms 15188 KB Output is correct
6 Correct 7 ms 15188 KB Output is correct
7 Correct 8 ms 15188 KB Output is correct
8 Correct 7 ms 15188 KB Output is correct
9 Correct 8 ms 15188 KB Output is correct
10 Correct 7 ms 15188 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 86 ms 27508 KB Output is correct
2 Correct 130 ms 29932 KB Output is correct
3 Correct 62 ms 24848 KB Output is correct
4 Correct 61 ms 24252 KB Output is correct
5 Correct 113 ms 29492 KB Output is correct

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 15316 KB Output is correct
2 Correct 9 ms 15188 KB Output is correct
3 Correct 8 ms 15328 KB Output is correct
4 Correct 9 ms 15316 KB Output is correct
5 Correct 8 ms 15316 KB Output is correct
6 Correct 8 ms 15316 KB Output is correct
7 Runtime error 21 ms 30932 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 8 ms 15316 KB Output is correct
2 Correct 9 ms 15188 KB Output is correct
3 Correct 8 ms 15328 KB Output is correct
4 Correct 9 ms 15316 KB Output is correct
5 Correct 8 ms 15316 KB Output is correct
6 Correct 8 ms 15316 KB Output is correct
7 Runtime error 21 ms 30932 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 15392 KB Output is correct
2 Correct 8 ms 15356 KB Output is correct
3 Correct 9 ms 15316 KB Output is correct
4 Correct 8 ms 15280 KB Output is correct
5 Correct 8 ms 15188 KB Output is correct
6 Correct 10 ms 15316 KB Output is correct
7 Correct 8 ms 15316 KB Output is correct
8 Correct 9 ms 15392 KB Output is correct
9 Correct 9 ms 15316 KB Output is correct
10 Correct 8 ms 15340 KB Output is correct
11 Correct 9 ms 15316 KB Output is correct
12 Correct 9 ms 15316 KB Output is correct
13 Correct 9 ms 15316 KB Output is correct
14 Correct 8 ms 15316 KB Output is correct
15 Correct 10 ms 15316 KB Output is correct
16 Runtime error 21 ms 30932 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 7 ms 15188 KB Output is correct
2 Correct 7 ms 15188 KB Output is correct
3 Correct 7 ms 15188 KB Output is correct
4 Correct 7 ms 15188 KB Output is correct
5 Correct 8 ms 15188 KB Output is correct
6 Correct 7 ms 15188 KB Output is correct
7 Correct 8 ms 15188 KB Output is correct
8 Correct 7 ms 15188 KB Output is correct
9 Correct 8 ms 15188 KB Output is correct
10 Correct 7 ms 15188 KB Output is correct
11 Correct 86 ms 27508 KB Output is correct
12 Correct 130 ms 29932 KB Output is correct
13 Correct 62 ms 24848 KB Output is correct
14 Correct 61 ms 24252 KB Output is correct
15 Correct 113 ms 29492 KB Output is correct
16 Correct 8 ms 15316 KB Output is correct
17 Correct 9 ms 15188 KB Output is correct
18 Correct 8 ms 15328 KB Output is correct
19 Correct 9 ms 15316 KB Output is correct
20 Correct 8 ms 15316 KB Output is correct
21 Correct 8 ms 15316 KB Output is correct
22 Runtime error 21 ms 30932 KB Execution killed with signal 6
23 Halted 0 ms 0 KB -