oj.uz

Submission #555898

# Submission time Handle Problem Language Result Execution time Memory
555898 2022-05-01T18:51:06 Z blue Pipes (BOI13_pipes) C++17
90.9259 / 100
 192 ms 29704 KB 
#include <iostream>
#include <vector>
#include <queue>
using namespace std;
 
using ll = long long;
using pl = pair<ll, ll>;
using vpl = vector<pl>;
using pii = pair<int, int>;
using vi = vector<int>;
using vl = vector<ll>;
#define sz(x) int(x.size())
 
const int mx = 100'000;
const int emx = 500'000;
 
vl c(1+mx);
vector<pii> edge[1+mx];
 
vi deg(1+mx, 0);
vi visit(1+emx, 0);
 
vector<ll> ans(1+emx);
 
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	
	int N, M;
	cin >> N >> M;
 
	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});
		deg[u]++;
		deg[v]++;
	}
 
	if(M > N)
	{
		cout << "0\n";
		return 0;
	}
 
	queue<int> tbv;
	for(int i = 1; i <= N; i++)
	{
		if(deg[i] == 1)
		{
			tbv.push(i);
		}
	}
 
	int endv = -1;
 
	vi node_visit(1+N, 0);
 
	while(!tbv.empty())
	{
		int u = tbv.front();
		tbv.pop();
 
		node_visit[u] = 1;
 
		// cerr << "u = " << u << '\n';
 
		int elim = 0;
 
		for(auto ed: edge[u])
		{
			int v = ed.first;
 
			if(visit[ed.second]) continue;
 
			visit[ed.second] = 1;
 
			deg[v]--;
 
			elim = 1;
 
			if(deg[v] <= 1)
			{
				tbv.push(v);
			}
			ans[ed.second] = 2*c[u];
			// cerr << ed.first << ' ' << ed.second << " : " << 2*c[u] << '\n';
 
			c[v] -= c[u];
			c[u] -= c[u];
 
		}
 
		if(!elim)
		{
			if(M == N-1)
			{
				if(c[u] != 0)
				{
					cout << "0\n";
					return 0;
				}
			}
		}
	}
 
	// for(int u = 1; u <= N; u++)
	// {
	// 	cerr << "node = " << u << '\n';
	// 	for(auto ed: edge[u]) cerr << ed.first << ' ' << ed.second << '\n';
	// }
 
 
	if(M == N)
	{
		// cerr << "done\n";
		ll a[1+N], b[1+N];
 
		int u = 1;
		while(node_visit[u]) u++;
 
		int src = u;
 
		vi edgelist;
		vi nodelist;
 
		while(1)
		{
			int nv = 0;
			for(auto ed: edge[u])
			{
				if(visit[ed.second]) continue;
				visit[ed.second] = 1;
				nv = 1;
 
				nodelist.push_back(u);
				edgelist.push_back(ed.second);
 
				// cerr << u << " -> " << ed.first << ' ' << ed.second << '\n';
 
				u = ed.first;
				break;
			}
			if(!nv) break;
		}
 
		int Z = sz(edgelist);
 
		a[0] = 1;
		b[0] = 0;
 
		if(Z % 2 == 0)
		{
			cout << "0\n";
			return 0;
		}
 
		for(int z = 0; z+1 < Z; z++)
		{
			a[z+1] = -a[z];
			b[z+1] = c[ nodelist[z+1] ] - b[z];
		}
 
 
		// for(int i = 0; i < Z; i++) cerr << nodelist[i] << ' ' << edgelist[i] << ' ' << a[i] << ' ' << b[i] << '\n';
 
		ll x = 0;
 
		//if(b[0] + b[z-1] != c[ nodelist[] ])
		if((b[0] + b[Z-1]) % 2 != c[nodelist[0]] % 2) 
		{
			cout << "0\n";
		}
 
		//x + b[0]  +  x + b[z-1]  ==  c[nodelist[0]]
 
		ll x2 = (c[nodelist[0]] - b[0] - b[Z-1]);
 
		for(int y = 0; y < Z; y++)
			ans[ edgelist[y] ] = (a[y] * x2  +  2*b[y]);
	}
 
 
 
 
	for(int e = 1; e <= M; e++)
	{
		cout << ans[e] << '\n';
	}
 
}

Compilation message

pipes.cpp: In function 'int main()':
pipes.cpp:127:7: warning: unused variable 'src' [-Wunused-variable]
  127 |   int src = u;
      |       ^~~
pipes.cpp:172:6: warning: unused variable 'x' [-Wunused-variable]
  172 |   ll x = 0;
      |      ^
pipes.cpp:60:6: warning: unused variable 'endv' [-Wunused-variable]
   60 |  int endv = -1;
      |      ^~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 9684 KB Output is correct
2 Correct 6 ms 9684 KB Output is correct
3 Correct 7 ms 9684 KB Output is correct
4 Correct 58 ms 14476 KB Output is correct
5 Correct 5 ms 9664 KB Output is correct
6 Correct 5 ms 9684 KB Output is correct
7 Correct 4 ms 9684 KB Output is correct
8 Correct 4 ms 9640 KB Output is correct
9 Correct 5 ms 9684 KB Output is correct
10 Correct 5 ms 9684 KB Output is correct
11 Correct 5 ms 9684 KB Output is correct
12 Correct 5 ms 9684 KB Output is correct
13 Correct 45 ms 13440 KB Output is correct
14 Correct 54 ms 14196 KB Output is correct
15 Correct 63 ms 14476 KB Output is correct
16 Correct 63 ms 13748 KB Output is correct
17 Correct 67 ms 14488 KB Output is correct
18 Correct 85 ms 14448 KB Output is correct
19 Correct 65 ms 13736 KB Output is correct
20 Correct 5 ms 9684 KB Output is correct
21 Correct 5 ms 9768 KB Output is correct
22 Correct 61 ms 14436 KB Output is correct
23 Correct 57 ms 13416 KB Output is correct
24 Correct 77 ms 14500 KB Output is correct
25 Correct 69 ms 13664 KB Output is correct

Subtask #2
60.9259259259 / 70.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 9684 KB Output isn't correct
2 Correct 5 ms 9684 KB Output is correct
3 Correct 57 ms 15544 KB Output is correct
4 Correct 50 ms 14412 KB Output is correct
5 Correct 44 ms 14652 KB Output is correct
6 Correct 186 ms 29704 KB Output is correct
7 Incorrect 5 ms 9684 KB Output isn't correct
8 Correct 5 ms 9684 KB Output is correct
9 Correct 4 ms 9684 KB Output is correct
10 Correct 5 ms 9684 KB Output is correct
11 Correct 5 ms 9684 KB Output is correct
12 Correct 5 ms 9684 KB Output is correct
13 Correct 7 ms 9684 KB Output is correct
14 Correct 5 ms 9684 KB Output is correct
15 Correct 5 ms 9684 KB Output is correct
16 Correct 5 ms 9684 KB Output is correct
17 Correct 5 ms 9684 KB Output is correct
18 Correct 5 ms 9684 KB Output is correct
19 Correct 6 ms 9684 KB Output is correct
20 Correct 5 ms 9684 KB Output is correct
21 Correct 6 ms 9808 KB Output is correct
22 Incorrect 7 ms 9792 KB Output isn't correct
23 Correct 47 ms 14632 KB Output is correct
24 Incorrect 58 ms 15720 KB Output isn't correct
25 Correct 72 ms 15464 KB Output is correct
26 Correct 50 ms 14488 KB Output is correct
27 Correct 47 ms 14384 KB Output is correct
28 Correct 46 ms 14932 KB Output is correct
29 Correct 151 ms 25844 KB Output is correct
30 Correct 68 ms 15284 KB Output is correct
31 Correct 59 ms 15804 KB Output is correct
32 Incorrect 57 ms 15980 KB Output isn't correct
33 Correct 58 ms 15680 KB Output is correct
34 Correct 40 ms 14412 KB Output is correct
35 Correct 40 ms 14400 KB Output is correct
36 Correct 43 ms 14696 KB Output is correct
37 Correct 192 ms 29628 KB Output is correct
38 Correct 71 ms 15576 KB Output is correct
39 Incorrect 66 ms 15964 KB Output isn't correct
40 Correct 59 ms 15840 KB Output is correct
41 Correct 48 ms 15740 KB Output is correct
42 Correct 38 ms 14276 KB Output is correct
43 Correct 44 ms 14392 KB Output is correct
44 Correct 48 ms 14648 KB Output is correct
45 Correct 141 ms 27284 KB Output is correct
46 Correct 75 ms 15432 KB Output is correct
47 Correct 59 ms 15768 KB Output is correct
48 Correct 58 ms 15736 KB Output is correct
49 Correct 48 ms 15308 KB Output is correct
50 Correct 41 ms 14548 KB Output is correct
51 Correct 45 ms 14632 KB Output is correct
52 Correct 45 ms 14320 KB Output is correct
53 Correct 151 ms 27168 KB Output is correct
54 Incorrect 58 ms 15476 KB Output isn't correct