oj.uz

답안 #555876

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
555876 2022-05-01T18:32:47 Z blue Pipes (BOI13_pipes) C++17
67.5926 / 100
 65 ms 21196 KB 
#include <iostream>
#include <vector>
#include <queue>
using namespace std;

using ll = long long;
using vi = vector<int>;
using pii = pair<int, int>;
using vpii = vector<pii>;
using vll = vector<ll>;
#define sz(x) int(x.size())

const int mx = 100'000;

int N, M;
vpii edge[1+mx];
vll c(1+mx);


vll x(1+mx);

void dfs(int u, int p)
{
	for(pii vp : edge[u])
	{
		int v = vp.first;
		int e = vp.second;

		if(v == p) continue;
		dfs(v, u);

		x[e] = 2*c[v];

		c[u] -= c[v];
		c[v] = 0;
	}
}

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int N, M;
	cin >> N >> M;

	if(M > N)
	{
		cout << "0\n";
		return 0;
	}

	for(int i = 1; i <= N; i++) cin >> c[i];

	for(int j = 1; j <= M; j++)
	{
		int u, v;
		cin >> u >> v;
		edge[u].push_back({v, j});
		edge[v].push_back({u, j});
	}

	if(M == N-1)
	{
		dfs(1, 0);
	}
	else
	{
		queue<int> tbv;
		vi visit(1+N, 0);

		vi deg(1+N);
		for(int i = 1; i <= N; i++)
		{
			deg[i] = sz(edge[i]);
			if(deg[i] == 1)
			{
				tbv.push(i);
				visit[i] = 1;
			}
		}

		// cerr << "A\n";


		while(!tbv.empty())
		{
			int u = tbv.front();
			tbv.pop();

			for(auto vp : edge[u])
			{
				int v = vp.first;
				int e = vp.second;

				if(visit[v]) continue;

				deg[v]--;

				x[e] = 2*c[v];
				c[v] -= c[u];
				c[u] = 0;

				if(!deg[v])
				{
					tbv.push(v);
					visit[v] = 1;
				}
			}
		}

		// cerr << "B\n";

		int U = 1;
		while(visit[U])
			U++;

		int viscount = 0;
		for(int u = 1; u <= N; u++)
			viscount += visit[u];

		vi edgevis(1+N, 0);

		// cerr << "C\n";

		vi nodes, edges;
		for(int z = 1; z <= N - viscount; z++)
		{
			for(auto vp : edge[U])
			{
				int v = vp.first;
				int e = vp.second;

				if(visit[v]) continue;
				if(edgevis[e]) continue;

				edgevis[e] = 1;


				nodes.push_back(U);
				edges.push_back(e);

				U = v;

				break;
			}
		}
		// cerr << "D\n";

		int Z = N - viscount;

		// cerr << "Z = " << Z << '\n';

		// for(int z = 0; z < Z; z++) cerr << nodes[z] << ' ' << edges[z] << '\n';

		if(Z % 2 == 0)
		{
			cout << "0\n";
			return 0;
		}

		vll a(Z), b(Z);
		a[0] = 1;
		b[0] = 0;

		for(int i = 1; i < Z; i++)
		{
			a[i] = -a[i-1];
			b[i] = c[nodes[i]] - b[i-1];
		}

		//(a.back() + a[0]) * x  +  (b.back() + b[0]) == c[nodes[0]]
		//x = (c[nodes[0]] - (b.back() + b[0])) / (a.back() + a[0])

		for(int i = 0; i < Z; i++)
		{
			x[edges[i]] = 2*((a[i] * (c[nodes[0]] - (b.back() + b[0]))) / (a.back() + a[0]) + b[i]);

			// cerr << i << " : " << nodes[i] << " : " << a[i] << ' ' << b[i] << "\n";
		}
	}

	for(int e = 1; e <= M; e++) 
		cout << x[e] << '\n';
}

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4180 KB Output is correct
2 Correct 3 ms 4180 KB Output is correct
3 Correct 2 ms 4180 KB Output is correct
4 Correct 56 ms 8396 KB Output is correct
5 Correct 3 ms 4180 KB Output is correct
6 Correct 2 ms 4180 KB Output is correct
7 Correct 2 ms 4180 KB Output is correct
8 Correct 2 ms 4180 KB Output is correct
9 Correct 3 ms 4180 KB Output is correct
10 Correct 3 ms 4180 KB Output is correct
11 Correct 2 ms 4180 KB Output is correct
12 Correct 2 ms 4308 KB Output is correct
13 Correct 44 ms 7544 KB Output is correct
14 Correct 65 ms 8144 KB Output is correct
15 Correct 54 ms 8392 KB Output is correct
16 Correct 44 ms 7776 KB Output is correct
17 Correct 53 ms 8348 KB Output is correct
18 Correct 57 ms 8332 KB Output is correct
19 Correct 55 ms 11676 KB Output is correct
20 Correct 2 ms 4180 KB Output is correct
21 Correct 3 ms 4180 KB Output is correct
22 Correct 57 ms 8316 KB Output is correct
23 Correct 38 ms 7460 KB Output is correct
24 Correct 55 ms 8412 KB Output is correct
25 Correct 43 ms 7760 KB Output is correct

Subtask #2
37.5925925926 / 70.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 4180 KB Output isn't correct
2 Incorrect 3 ms 4180 KB Output isn't correct
3 Runtime error 47 ms 19616 KB Execution killed with signal 11
4 Correct 2 ms 4180 KB Output is correct
5 Correct 2 ms 4180 KB Output is correct
6 Correct 3 ms 4180 KB Output is correct
7 Incorrect 2 ms 4180 KB Output isn't correct
8 Incorrect 2 ms 4172 KB Output isn't correct
9 Runtime error 6 ms 8444 KB Execution killed with signal 6
10 Correct 2 ms 4180 KB Output is correct
11 Correct 2 ms 4180 KB Output is correct
12 Correct 2 ms 4180 KB Output is correct
13 Correct 2 ms 4180 KB Output is correct
14 Incorrect 2 ms 4180 KB Output isn't correct
15 Incorrect 2 ms 4180 KB Output isn't correct
16 Incorrect 3 ms 4180 KB Output isn't correct
17 Correct 3 ms 4180 KB Output is correct
18 Correct 2 ms 4180 KB Output is correct
19 Correct 3 ms 4180 KB Output is correct
20 Correct 2 ms 4180 KB Output is correct
21 Correct 2 ms 4180 KB Output is correct
22 Incorrect 2 ms 4180 KB Output isn't correct
23 Runtime error 56 ms 18640 KB Execution killed with signal 11
24 Runtime error 47 ms 20848 KB Execution killed with signal 11
25 Runtime error 51 ms 19576 KB Execution killed with signal 11
26 Correct 2 ms 4180 KB Output is correct
27 Correct 2 ms 4180 KB Output is correct
28 Correct 2 ms 4180 KB Output is correct
29 Correct 2 ms 4180 KB Output is correct
30 Runtime error 47 ms 21196 KB Execution killed with signal 11
31 Runtime error 49 ms 20272 KB Execution killed with signal 11
32 Incorrect 47 ms 9216 KB Output isn't correct
33 Runtime error 58 ms 21072 KB Execution killed with signal 11
34 Correct 2 ms 4180 KB Output is correct
35 Correct 2 ms 4180 KB Output is correct
36 Correct 2 ms 4180 KB Output is correct
37 Correct 2 ms 4180 KB Output is correct
38 Runtime error 44 ms 20428 KB Execution killed with signal 11
39 Runtime error 52 ms 20228 KB Execution killed with signal 11
40 Runtime error 58 ms 20332 KB Execution killed with signal 11
41 Runtime error 48 ms 20228 KB Execution killed with signal 11
42 Correct 2 ms 4180 KB Output is correct
43 Correct 2 ms 4128 KB Output is correct
44 Correct 2 ms 4180 KB Output is correct
45 Correct 2 ms 4180 KB Output is correct
46 Incorrect 39 ms 8476 KB Output isn't correct
47 Incorrect 45 ms 9552 KB Output isn't correct
48 Incorrect 41 ms 8656 KB Output isn't correct
49 Correct 38 ms 8908 KB Output is correct
50 Correct 2 ms 4180 KB Output is correct
51 Correct 2 ms 4180 KB Output is correct
52 Correct 2 ms 4180 KB Output is correct
53 Correct 2 ms 4180 KB Output is correct
54 Runtime error 50 ms 20376 KB Execution killed with signal 11