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Submission #635469

# Submission time Handle Problem Language Result Execution time Memory
635469 2022-08-26T10:02:53 Z Markomafko972 Parking (CEOI22_parking) C++14
100 / 100
 554 ms 47500 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) {
			q.push(tren[0].X);
			dist[tren[0].X] = 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:191:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  191 |         for (int j = 0; j < tren.size(); j++) {
      |                         ~~^~~~~~~~~~~~~
Main.cpp:198:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  198 |         for (int abc = 0; abc < tren.size(); abc++) {
      |                           ~~~~^~~~~~~~~~~~~
Main.cpp:208:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  208 |             for (int j = 0; j < pravi[novi].size(); j++) {
      |                             ~~^~~~~~~~~~~~~~~~~~~~
Main.cpp:234:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  234 |     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 11 ms 15956 KB Output is correct
2 Correct 9 ms 15956 KB Output is correct
3 Correct 11 ms 16124 KB Output is correct
4 Correct 9 ms 15956 KB Output is correct
5 Correct 9 ms 15956 KB Output is correct
6 Correct 8 ms 15956 KB Output is correct
7 Correct 8 ms 15956 KB Output is correct
8 Correct 8 ms 15956 KB Output is correct
9 Correct 9 ms 15956 KB Output is correct
10 Correct 9 ms 15956 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 109 ms 28300 KB Output is correct
2 Correct 152 ms 30772 KB Output is correct
3 Correct 89 ms 25732 KB Output is correct
4 Correct 63 ms 25152 KB Output is correct
5 Correct 126 ms 30476 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 16084 KB Output is correct
2 Correct 9 ms 15956 KB Output is correct
3 Correct 8 ms 16084 KB Output is correct
4 Correct 9 ms 16212 KB Output is correct
5 Correct 10 ms 16040 KB Output is correct
6 Correct 9 ms 16020 KB Output is correct
7 Correct 9 ms 16084 KB Output is correct
8 Correct 9 ms 16084 KB Output is correct
9 Correct 10 ms 16116 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 16084 KB Output is correct
2 Correct 9 ms 15956 KB Output is correct
3 Correct 8 ms 16084 KB Output is correct
4 Correct 9 ms 16212 KB Output is correct
5 Correct 10 ms 16040 KB Output is correct
6 Correct 9 ms 16020 KB Output is correct
7 Correct 9 ms 16084 KB Output is correct
8 Correct 9 ms 16084 KB Output is correct
9 Correct 10 ms 16116 KB Output is correct
10 Correct 430 ms 45360 KB Output is correct
11 Correct 53 ms 21564 KB Output is correct
12 Correct 300 ms 41432 KB Output is correct
13 Correct 493 ms 47152 KB Output is correct
14 Correct 270 ms 38932 KB Output is correct
15 Correct 304 ms 38480 KB Output is correct
16 Correct 546 ms 45864 KB Output is correct
17 Correct 390 ms 42216 KB Output is correct
18 Correct 554 ms 46672 KB Output is correct

Subtask #5
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 16084 KB Output is correct
2 Correct 9 ms 16140 KB Output is correct
3 Correct 10 ms 16132 KB Output is correct
4 Correct 11 ms 16084 KB Output is correct
5 Correct 11 ms 15988 KB Output is correct
6 Correct 9 ms 16128 KB Output is correct
7 Correct 11 ms 16060 KB Output is correct
8 Correct 10 ms 16132 KB Output is correct
9 Correct 10 ms 16084 KB Output is correct
10 Correct 8 ms 16084 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 16048 KB Output is correct
14 Correct 9 ms 16084 KB Output is correct
15 Correct 9 ms 16144 KB Output is correct
16 Correct 12 ms 16084 KB Output is correct
17 Correct 8 ms 16084 KB Output is correct
18 Correct 10 ms 16084 KB Output is correct
19 Correct 11 ms 16084 KB Output is correct
20 Correct 10 ms 16084 KB Output is correct
21 Correct 8 ms 16084 KB Output is correct
22 Correct 10 ms 16084 KB Output is correct
23 Correct 11 ms 16084 KB Output is correct
24 Correct 12 ms 16164 KB Output is correct

Subtask #6
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 15956 KB Output is correct
2 Correct 9 ms 15956 KB Output is correct
3 Correct 11 ms 16124 KB Output is correct
4 Correct 9 ms 15956 KB Output is correct
5 Correct 9 ms 15956 KB Output is correct
6 Correct 8 ms 15956 KB Output is correct
7 Correct 8 ms 15956 KB Output is correct
8 Correct 8 ms 15956 KB Output is correct
9 Correct 9 ms 15956 KB Output is correct
10 Correct 9 ms 15956 KB Output is correct
11 Correct 109 ms 28300 KB Output is correct
12 Correct 152 ms 30772 KB Output is correct
13 Correct 89 ms 25732 KB Output is correct
14 Correct 63 ms 25152 KB Output is correct
15 Correct 126 ms 30476 KB Output is correct
16 Correct 10 ms 16084 KB Output is correct
17 Correct 9 ms 15956 KB Output is correct
18 Correct 8 ms 16084 KB Output is correct
19 Correct 9 ms 16212 KB Output is correct
20 Correct 10 ms 16040 KB Output is correct
21 Correct 9 ms 16020 KB Output is correct
22 Correct 9 ms 16084 KB Output is correct
23 Correct 9 ms 16084 KB Output is correct
24 Correct 10 ms 16116 KB Output is correct
25 Correct 430 ms 45360 KB Output is correct
26 Correct 53 ms 21564 KB Output is correct
27 Correct 300 ms 41432 KB Output is correct
28 Correct 493 ms 47152 KB Output is correct
29 Correct 270 ms 38932 KB Output is correct
30 Correct 304 ms 38480 KB Output is correct
31 Correct 546 ms 45864 KB Output is correct
32 Correct 390 ms 42216 KB Output is correct
33 Correct 554 ms 46672 KB Output is correct
34 Correct 9 ms 16084 KB Output is correct
35 Correct 9 ms 16140 KB Output is correct
36 Correct 10 ms 16132 KB Output is correct
37 Correct 11 ms 16084 KB Output is correct
38 Correct 11 ms 15988 KB Output is correct
39 Correct 9 ms 16128 KB Output is correct
40 Correct 11 ms 16060 KB Output is correct
41 Correct 10 ms 16132 KB Output is correct
42 Correct 10 ms 16084 KB Output is correct
43 Correct 8 ms 16084 KB Output is correct
44 Correct 9 ms 16084 KB Output is correct
45 Correct 9 ms 16084 KB Output is correct
46 Correct 9 ms 16048 KB Output is correct
47 Correct 9 ms 16084 KB Output is correct
48 Correct 9 ms 16144 KB Output is correct
49 Correct 12 ms 16084 KB Output is correct
50 Correct 8 ms 16084 KB Output is correct
51 Correct 10 ms 16084 KB Output is correct
52 Correct 11 ms 16084 KB Output is correct
53 Correct 10 ms 16084 KB Output is correct
54 Correct 8 ms 16084 KB Output is correct
55 Correct 10 ms 16084 KB Output is correct
56 Correct 11 ms 16084 KB Output is correct
57 Correct 12 ms 16164 KB Output is correct
58 Correct 421 ms 42728 KB Output is correct
59 Correct 541 ms 46300 KB Output is correct
60 Correct 356 ms 39692 KB Output is correct
61 Correct 415 ms 43496 KB Output is correct
62 Correct 48 ms 21604 KB Output is correct
63 Correct 532 ms 47328 KB Output is correct
64 Correct 303 ms 39504 KB Output is correct
65 Correct 477 ms 45120 KB Output is correct
66 Correct 497 ms 46292 KB Output is correct
67 Correct 312 ms 40744 KB Output is correct
68 Correct 499 ms 47500 KB Output is correct
69 Correct 498 ms 46540 KB Output is correct
70 Correct 270 ms 40112 KB Output is correct
71 Correct 298 ms 38772 KB Output is correct
72 Correct 283 ms 38848 KB Output is correct
73 Correct 539 ms 45540 KB Output is correct
74 Correct 303 ms 38988 KB Output is correct
75 Correct 492 ms 44780 KB Output is correct
76 Correct 499 ms 45260 KB Output is correct
77 Correct 490 ms 44316 KB Output is correct
78 Correct 295 ms 39136 KB Output is correct
79 Correct 471 ms 45076 KB Output is correct
80 Correct 352 ms 42308 KB Output is correct
81 Correct 500 ms 46172 KB Output is correct