oj.uz

Submission #634482

# Submission time Handle Problem Language Result Execution time Memory
634482 2022-08-24T13:20:57 Z Markomafko972 Parking (CEOI22_parking) C++14
20 / 100
 2000 ms 29856 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();
            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) {
            	if (pr.size() == 0) {
            		while (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:160:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  160 |             for (int j = 0; j < pravi[novi].size(); j++) {
      |                             ~~^~~~~~~~~~~~~~~~~~~~
Main.cpp:223:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  223 |     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 15188 KB Output is correct
2 Correct 9 ms 15220 KB Output is correct
3 Correct 9 ms 15188 KB Output is correct
4 Correct 9 ms 15188 KB Output is correct
5 Correct 10 ms 15116 KB Output is correct
6 Correct 9 ms 15188 KB Output is correct
7 Correct 8 ms 15208 KB Output is correct
8 Correct 10 ms 15188 KB Output is correct
9 Correct 9 ms 15224 KB Output is correct
10 Correct 8 ms 15188 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 99 ms 27516 KB Output is correct
2 Correct 149 ms 29856 KB Output is correct
3 Correct 76 ms 24772 KB Output is correct
4 Correct 65 ms 24208 KB Output is correct
5 Correct 152 ms 29508 KB Output is correct

Subtask #3
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 15236 KB Output is correct
2 Correct 10 ms 15188 KB Output is correct
3 Correct 11 ms 15316 KB Output is correct
4 Correct 11 ms 15408 KB Output is correct
5 Correct 12 ms 15316 KB Output is correct
6 Correct 11 ms 15316 KB Output is correct
7 Execution timed out 2098 ms 15300 KB Time limit exceeded
8 Halted 0 ms 0 KB -

Subtask #4
0.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 15236 KB Output is correct
2 Correct 10 ms 15188 KB Output is correct
3 Correct 11 ms 15316 KB Output is correct
4 Correct 11 ms 15408 KB Output is correct
5 Correct 12 ms 15316 KB Output is correct
6 Correct 11 ms 15316 KB Output is correct
7 Execution timed out 2098 ms 15300 KB Time limit exceeded
8 Halted 0 ms 0 KB -

Subtask #5
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 15316 KB Output is correct
2 Correct 12 ms 15316 KB Output is correct
3 Correct 11 ms 15244 KB Output is correct
4 Correct 10 ms 15228 KB Output is correct
5 Correct 9 ms 15184 KB Output is correct
6 Correct 9 ms 15272 KB Output is correct
7 Correct 11 ms 15296 KB Output is correct
8 Correct 9 ms 15316 KB Output is correct
9 Correct 10 ms 15388 KB Output is correct
10 Correct 8 ms 15316 KB Output is correct
11 Correct 10 ms 15316 KB Output is correct
12 Correct 12 ms 15316 KB Output is correct
13 Correct 8 ms 15316 KB Output is correct
14 Correct 9 ms 15316 KB Output is correct
15 Correct 8 ms 15320 KB Output is correct
16 Execution timed out 2086 ms 15316 KB Time limit exceeded
17 Halted 0 ms 0 KB -

Subtask #6
0.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 15188 KB Output is correct
2 Correct 9 ms 15220 KB Output is correct
3 Correct 9 ms 15188 KB Output is correct
4 Correct 9 ms 15188 KB Output is correct
5 Correct 10 ms 15116 KB Output is correct
6 Correct 9 ms 15188 KB Output is correct
7 Correct 8 ms 15208 KB Output is correct
8 Correct 10 ms 15188 KB Output is correct
9 Correct 9 ms 15224 KB Output is correct
10 Correct 8 ms 15188 KB Output is correct
11 Correct 99 ms 27516 KB Output is correct
12 Correct 149 ms 29856 KB Output is correct
13 Correct 76 ms 24772 KB Output is correct
14 Correct 65 ms 24208 KB Output is correct
15 Correct 152 ms 29508 KB Output is correct
16 Correct 10 ms 15236 KB Output is correct
17 Correct 10 ms 15188 KB Output is correct
18 Correct 11 ms 15316 KB Output is correct
19 Correct 11 ms 15408 KB Output is correct
20 Correct 12 ms 15316 KB Output is correct
21 Correct 11 ms 15316 KB Output is correct
22 Execution timed out 2098 ms 15300 KB Time limit exceeded
23 Halted 0 ms 0 KB -