oj.uz

Submission #120955

# Submission time Handle Problem Language Result Execution time Memory
120955 2019-06-25T20:06:06 Z thiago4532 Pipes (BOI13_pipes) C++17
65 / 100
 379 ms 29880 KB 
#include <bits/stdc++.h>
#define int int64_t

using namespace std;
typedef pair<int, int> pii;
const int maxn = 1e5 + 10;
const int maxm = 5e5 + 10;
vector<int> grafo[maxn];
int n;
int s[maxn];
map<pair<int, int>, int> mapa;
int val[maxn], ans[maxn];
int grau[maxn];

namespace tree{

int nivel[maxn], pai[maxn], soma[maxn];
void dfs(int u, int p = 0) {
	pai[u] = p;

	for(auto v : grafo[u]) {
		if(v == p) continue;
		nivel[v] = nivel[u] + 1;
		dfs(v, u);
	}
}

};

namespace cycle {
vector<int> grafo[maxn];
int st;

bool mark[maxn];
vector<int> ordem;

void dfs(int u) {
	mark[u] = true;
	ordem.push_back(u);

	for(auto v : grafo[u]) {
		if(!mark[v]) dfs(v);
	}
}

void solve() {
	dfs(st);
	if(ordem.size() % 2 == 0){
		cout << "0\n";
		return;
	}

	int x = 0;
	int sig = 1;
	for(auto& u : ordem){
		x += s[u]*sig;
		sig *= -1;
	}
	x/=2;

	ans[mapa[{ordem[0], ordem.back()}]] = x;
	// cout << ordem[0] << " " << ordem.back() << ": " << ans[mapa[{ordem[0], ordem.back()}]] << "\n";
	for(int i = 0; i < (int)ordem.size() - 1; i++) {
		ans[mapa[{ordem[i], ordem[i+1]}]] = s[ordem[i]] - x;
		// cout << ordem[i] << " " << ordem[i+1] << ": " << s[ordem[i]] - x << "\n";
		x = s[ordem[i]] - x;
	}

	for(int i=1;i<=n;i++){
		cout << ans[i] << "\n";
	}
}

};

int32_t main() {
	int m;

	cin >> n >> m;
	if(m > n) {
		cout << "0\n";
		return 0;
	}
	int total = 0;
	for(int i=1;i<=n;i++)
		cin >> s[i], s[i] *= 2, total += s[i];

	for(int i=1;i<=m;i++) {
		int a, b;
		cin >> a >> b;
		grafo[a].push_back(b);
		grafo[b].push_back(a);
		mapa[{a, b}] = i;
		mapa[{b, a}] = i;

		grau[a]++;
		grau[b]++;
	}
	if(n - 1 == m) {
		tree::dfs(1);
		vector<pii> arr;
		for(int i=1;i<=n;i++)
			arr.push_back({tree::nivel[i], i});
		sort(arr.begin(), arr.end(), greater<pii>());

		for(auto e : arr) {
			int v = e.second;
			int u = tree::pai[v];

			tree::soma[u] += (s[v] - tree::soma[v]);
			ans[mapa[{u, v}]] = (s[v] - tree::soma[v]);
		}

		if(tree::soma[1] != s[1]){
			cout << "0\n";
			return 0;
		}

		for(int i=1;i<=m;i++)
			cout << ans[i] << "\n";

	}else { // n == m
		bool only_cycle = true; // only cycle
		for(int i=1;i<=n;i++)
			if(grau[i] == 1) only_cycle = false;

		if(only_cycle) {
			for(int i=1;i<=n;i++)
				cycle::grafo[i] = grafo[i];
			cycle::st = 1;

			cycle::solve();
		}else {

		}
	}
	return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5120 KB Output is correct
2 Correct 7 ms 5120 KB Output is correct
3 Correct 7 ms 5248 KB Output is correct
4 Correct 366 ms 28004 KB Output is correct
5 Correct 6 ms 5120 KB Output is correct
6 Correct 6 ms 5120 KB Output is correct
7 Correct 6 ms 5120 KB Output is correct
8 Correct 6 ms 5248 KB Output is correct
9 Correct 7 ms 5248 KB Output is correct
10 Correct 7 ms 5248 KB Output is correct
11 Correct 8 ms 5248 KB Output is correct
12 Correct 8 ms 5376 KB Output is correct
13 Correct 297 ms 23400 KB Output is correct
14 Correct 326 ms 26856 KB Output is correct
15 Correct 347 ms 28132 KB Output is correct
16 Correct 285 ms 24660 KB Output is correct
17 Correct 361 ms 28164 KB Output is correct
18 Correct 376 ms 28104 KB Output is correct
19 Correct 379 ms 29880 KB Output is correct
20 Correct 5 ms 5120 KB Output is correct
21 Correct 7 ms 5248 KB Output is correct
22 Correct 374 ms 28212 KB Output is correct
23 Correct 273 ms 23396 KB Output is correct
24 Correct 348 ms 28232 KB Output is correct
25 Correct 287 ms 24352 KB Output is correct

Subtask #2
35.0 / 70.0

# Verdict Execution time Memory Grader output
1 Incorrect 6 ms 4992 KB Output isn't correct
2 Incorrect 7 ms 5248 KB Output isn't correct
3 Incorrect 236 ms 21640 KB Output isn't correct
4 Correct 6 ms 4992 KB Output is correct
5 Correct 5 ms 4992 KB Output is correct
6 Correct 5 ms 4992 KB Output is correct
7 Incorrect 6 ms 5120 KB Output isn't correct
8 Incorrect 6 ms 5120 KB Output isn't correct
9 Incorrect 5 ms 4992 KB Output isn't correct
10 Correct 6 ms 4992 KB Output is correct
11 Correct 6 ms 4992 KB Output is correct
12 Correct 5 ms 4992 KB Output is correct
13 Correct 5 ms 4992 KB Output is correct
14 Incorrect 6 ms 5120 KB Output isn't correct
15 Incorrect 7 ms 5248 KB Output isn't correct
16 Incorrect 6 ms 5120 KB Output isn't correct
17 Incorrect 7 ms 5248 KB Output isn't correct
18 Correct 6 ms 4992 KB Output is correct
19 Correct 5 ms 5120 KB Output is correct
20 Correct 6 ms 5120 KB Output is correct
21 Correct 5 ms 4992 KB Output is correct
22 Incorrect 8 ms 5248 KB Output isn't correct
23 Incorrect 207 ms 19164 KB Output isn't correct
24 Incorrect 248 ms 22648 KB Output isn't correct
25 Incorrect 239 ms 21648 KB Output isn't correct
26 Correct 6 ms 4992 KB Output is correct
27 Correct 6 ms 4992 KB Output is correct
28 Correct 5 ms 4992 KB Output is correct
29 Correct 6 ms 4992 KB Output is correct
30 Incorrect 241 ms 22008 KB Output isn't correct
31 Incorrect 237 ms 22264 KB Output isn't correct
32 Incorrect 262 ms 22776 KB Output isn't correct
33 Incorrect 254 ms 22492 KB Output isn't correct
34 Correct 6 ms 4992 KB Output is correct
35 Correct 6 ms 4992 KB Output is correct
36 Correct 5 ms 4992 KB Output is correct
37 Correct 6 ms 5120 KB Output is correct
38 Incorrect 257 ms 22460 KB Output isn't correct
39 Incorrect 254 ms 22776 KB Output isn't correct
40 Incorrect 251 ms 22520 KB Output isn't correct
41 Incorrect 256 ms 22404 KB Output isn't correct
42 Correct 5 ms 4992 KB Output is correct
43 Correct 6 ms 4992 KB Output is correct
44 Correct 5 ms 5000 KB Output is correct
45 Correct 6 ms 5120 KB Output is correct
46 Incorrect 372 ms 22268 KB Output isn't correct
47 Incorrect 255 ms 22588 KB Output isn't correct
48 Incorrect 244 ms 22496 KB Output isn't correct
49 Incorrect 256 ms 21752 KB Output isn't correct
50 Correct 6 ms 4992 KB Output is correct
51 Correct 6 ms 4992 KB Output is correct
52 Correct 6 ms 4992 KB Output is correct
53 Correct 6 ms 4992 KB Output is correct
54 Incorrect 270 ms 22152 KB Output isn't correct