oj.uz

Submission #1044303

# Submission time Handle Problem Language Result Execution time Memory
1044303 2024-08-05T08:43:39 Z 김은성(#11005) Parking (CEOI22_parking) C++17
60 / 100
 159 ms 30764 KB 
#include <bits/stdc++.h>
using namespace std;
bool ch[200009];
vector<pair<int, int> > graph[200009];
int b[200009], t[200009];
unordered_set<int> emp;
vector<int> color[200009];
vector<pair<int, int> > ans;
vector<int> comp, cols;
bool done[200009];
void dfs(int v){
	ch[v] = 1;
	cols.push_back(v);
	for(auto [e, u]: graph[v]){
		comp.push_back(e);
		if(!ch[u]){
			dfs(u);
		}
	}
}
void makemove(int occ, int e){
	//printf("from=%d to=%d\n", occ, e);
	ans.push_back(make_pair(occ, e));
	if(t[occ]){
		color[t[occ]].erase(find(color[t[occ]].begin(), color[t[occ]].end(), occ));
		color[b[occ]].push_back(occ);
		if(b[e]){
			t[e] = t[occ];
			t[occ] = 0;
		}
		else{
			b[e] = t[occ];
			t[occ] = 0;
			emp.erase(e);
			color[b[e]].push_back(e);
		}
	}
	else{
		color[b[occ]].erase(find(color[b[occ]].begin(), color[b[occ]].end(), occ));
		emp.insert(occ);
		if(b[e]){
			t[e] = b[occ];
			b[occ] = 0;
		}
		else{
			b[e] = b[occ];
			b[occ] = 0;
			emp.erase(e);
			color[b[e]].push_back(e);
		}
	}
}
int main(){
	int n, m, i, j, ans2 = 0;
	bool flag = 0;
	scanf("%d %d", &n, &m);
	//assert(m<=4);
	for(i=1; i<=m; i++){
		scanf("%d %d", &b[i], &t[i]);
		if(b[i] != t[i])
			flag = 1, ans2++;
		if(b[i] + t[i] == 0)
			emp.insert(i);
		if(t[i])
			color[t[i]].push_back(i);
		else if(b[i])
			color[b[i]].push_back(i);
	}
	if(n==m){
		if(flag)
			printf("-1\n");
		else
			printf("0\n");
		return 0;
	}
	while(1){
		queue<int> q;
		for(int c=1; c<=n; c++){
			if(color[c].size() >= 2){
				if(!t[color[c][0]] || !t[color[c][1]]){
					q.push(c);
				}
			}
		}
		while(!q.empty()){
			int c = q.front();
			q.pop();
			assert(color[c].size() >= 2);
				assert(!t[color[c][0]] || !t[color[c][1]]);
					if(!t[color[c][0]]){
						makemove(color[c][1], color[c][0]);
						done[c] = 1;
						int temp = b[color[c][1]];
						if(temp && !done[temp] && color[temp].size() >= 2){
							q.push(temp);
						}
					}
					else{
						makemove(color[c][0], color[c][1]);
						done[c] = 1;
						int temp = b[color[c][0]];
						if(temp && !done[temp] && color[temp].size() >= 2){
							q.push(temp);
						}
					}
		}
		vector<bool> tch(n+1);
		for(i=1; i<=m; i++){
			if(b[i] && t[i]){
				tch[b[i]] = 1;
				tch[t[i]] = 1;
			}
		}
		for(i=1; i<=n; i++){
			if(!tch[i])
				break;
		}
		if(i==n+1)
			break;
	}
	for(i=1; i<=m; i++){
		if(!b[i] || !t[i])
			continue;
		graph[b[i]].push_back(make_pair(i, t[i]));
		graph[t[i]].push_back(make_pair(i, b[i]));
	}
	for(i=1; i<=n; i++){
		assert(graph[i].size());
		if(done[i] || ch[i] || graph[i][0].second == i)
			continue;
		comp.clear();
		cols.clear();
		//printf("i=%d\n", i);
		dfs(i);
		sort(comp.begin(), comp.end());
		comp.erase(unique(comp.begin(), comp.end()), comp.end());
		deque<int> qa;
		for(int c: cols){
			if(color[c].size() >= 2){
				if(!t[color[c][0]] || !t[color[c][1]])
					qa.push_front(c);
				else
					qa.push_back(c);
			}
		}
		//printf("emp.size=%d\n", emp.size());
		if(qa.empty()){
			int occ = comp[0], e = *emp.begin();
			//printf("occ=%d e=%d\n", occ, e);
			makemove(occ, e);
			for(int c: cols){
				if(color[c].size() >= 2){
					if(!t[color[c][0]] || !t[color[c][1]])
						qa.push_front(c);
					else
						qa.push_back(c);
				}
			}
		}
		//printf("qa.size=%d\n", qa.size());
		while(!qa.empty()){
			//printf("qa.front=%d\n", qa.front());
			if(done[qa.front()]){
				qa.pop_front();
				continue;
			}
			int from = color[qa.front()][0], to = color[qa.front()][1];
			//printf("from=%d to=%d\n", from, to);
			if(t[to])
				swap(from, to);
			if(t[to]){
				if(emp.empty()){
					printf("-1\n");
					return 0;
				}
				int e = *emp.begin();
				//printf("from=%d to=%d e=%d\n", from, to, e);
				makemove(from, e);
				makemove(to, e);
			}
			else{
				makemove(from, to);
			}
			done[qa.front()] = 1;
			qa.pop_front();
			for(int c: {b[from], b[to]}){
				if(c && color[c].size() == 2){
					if(!t[color[c][0]] || !t[color[c][1]])
						qa.push_front(c);
					else
						qa.push_back(c);
				}
			}
		}
	}
	printf("%d\n", ans.size());
	for(auto [u, v]: ans){
		printf("%d %d\n", u, v);
	}
	return 0;
}

Compilation message

Main.cpp: In function 'int main()':
Main.cpp:196:11: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wformat=]
  196 |  printf("%d\n", ans.size());
      |          ~^     ~~~~~~~~~~
      |           |             |
      |           int           std::vector<std::pair<int, int> >::size_type {aka long unsigned int}
      |          %ld
Main.cpp:54:15: warning: unused variable 'j' [-Wunused-variable]
   54 |  int n, m, i, j, ans2 = 0;
      |               ^
Main.cpp:56:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |  scanf("%d %d", &n, &m);
      |  ~~~~~^~~~~~~~~~~~~~~~~
Main.cpp:59:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |   scanf("%d %d", &b[i], &t[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 11356 KB Output is correct
2 Correct 4 ms 11424 KB Output is correct
3 Correct 2 ms 11356 KB Output is correct
4 Correct 2 ms 11356 KB Output is correct
5 Correct 2 ms 11356 KB Output is correct
6 Correct 2 ms 11356 KB Output is correct
7 Correct 2 ms 11356 KB Output is correct
8 Correct 2 ms 11356 KB Output is correct
9 Correct 2 ms 11356 KB Output is correct
10 Correct 2 ms 11352 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 66 ms 23800 KB Output is correct
2 Correct 112 ms 25024 KB Output is correct
3 Correct 77 ms 22548 KB Output is correct
4 Correct 51 ms 22304 KB Output is correct
5 Correct 87 ms 25532 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 11352 KB Output is correct
2 Correct 2 ms 11356 KB Output is correct
3 Correct 2 ms 11352 KB Output is correct
4 Correct 2 ms 11356 KB Output is correct
5 Correct 2 ms 11356 KB Output is correct
6 Correct 2 ms 11356 KB Output is correct
7 Correct 2 ms 11352 KB Output is correct
8 Correct 2 ms 11352 KB Output is correct
9 Correct 3 ms 11356 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 11352 KB Output is correct
2 Correct 2 ms 11356 KB Output is correct
3 Correct 2 ms 11352 KB Output is correct
4 Correct 2 ms 11356 KB Output is correct
5 Correct 2 ms 11356 KB Output is correct
6 Correct 2 ms 11356 KB Output is correct
7 Correct 2 ms 11352 KB Output is correct
8 Correct 2 ms 11352 KB Output is correct
9 Correct 3 ms 11356 KB Output is correct
10 Correct 113 ms 30504 KB Output is correct
11 Correct 33 ms 18768 KB Output is correct
12 Correct 38 ms 18908 KB Output is correct
13 Correct 128 ms 29640 KB Output is correct
14 Correct 32 ms 17488 KB Output is correct
15 Correct 67 ms 23652 KB Output is correct
16 Correct 159 ms 30764 KB Output is correct
17 Correct 51 ms 24148 KB Output is correct
18 Correct 120 ms 30408 KB Output is correct

Subtask #5
0.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 11352 KB Output is correct
2 Correct 2 ms 11356 KB Output is correct
3 Correct 2 ms 11360 KB Output is correct
4 Correct 2 ms 11356 KB Output is correct
5 Correct 2 ms 11352 KB Output is correct
6 Correct 2 ms 11356 KB Output is correct
7 Correct 2 ms 11356 KB Output is correct
8 Incorrect 2 ms 11352 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #6
0.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 11356 KB Output is correct
2 Correct 4 ms 11424 KB Output is correct
3 Correct 2 ms 11356 KB Output is correct
4 Correct 2 ms 11356 KB Output is correct
5 Correct 2 ms 11356 KB Output is correct
6 Correct 2 ms 11356 KB Output is correct
7 Correct 2 ms 11356 KB Output is correct
8 Correct 2 ms 11356 KB Output is correct
9 Correct 2 ms 11356 KB Output is correct
10 Correct 2 ms 11352 KB Output is correct
11 Correct 66 ms 23800 KB Output is correct
12 Correct 112 ms 25024 KB Output is correct
13 Correct 77 ms 22548 KB Output is correct
14 Correct 51 ms 22304 KB Output is correct
15 Correct 87 ms 25532 KB Output is correct
16 Correct 2 ms 11352 KB Output is correct
17 Correct 2 ms 11356 KB Output is correct
18 Correct 2 ms 11352 KB Output is correct
19 Correct 2 ms 11356 KB Output is correct
20 Correct 2 ms 11356 KB Output is correct
21 Correct 2 ms 11356 KB Output is correct
22 Correct 2 ms 11352 KB Output is correct
23 Correct 2 ms 11352 KB Output is correct
24 Correct 3 ms 11356 KB Output is correct
25 Correct 113 ms 30504 KB Output is correct
26 Correct 33 ms 18768 KB Output is correct
27 Correct 38 ms 18908 KB Output is correct
28 Correct 128 ms 29640 KB Output is correct
29 Correct 32 ms 17488 KB Output is correct
30 Correct 67 ms 23652 KB Output is correct
31 Correct 159 ms 30764 KB Output is correct
32 Correct 51 ms 24148 KB Output is correct
33 Correct 120 ms 30408 KB Output is correct
34 Correct 2 ms 11352 KB Output is correct
35 Correct 2 ms 11356 KB Output is correct
36 Correct 2 ms 11360 KB Output is correct
37 Correct 2 ms 11356 KB Output is correct
38 Correct 2 ms 11352 KB Output is correct
39 Correct 2 ms 11356 KB Output is correct
40 Correct 2 ms 11356 KB Output is correct
41 Incorrect 2 ms 11352 KB Output isn't correct
42 Halted 0 ms 0 KB -