oj.uz

Submission #125144

# Submission time Handle Problem Language Result Execution time Memory
125144 2019-07-04T17:46:13 Z thiago4532 Pipes (BOI13_pipes) C++17
100 / 100
 455 ms 24832 KB 
#include <bits/stdc++.h>
#define int int64_t

using namespace std;
const int maxn = 1e5 + 10;
bool mark[maxn];
int ans[5*maxn], s[maxn], grau[maxn];
map<pair<int, int>, int> mapa;
int n;
vector<int> grafo[maxn];
bool marca[maxn];

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]++;
	}
	
	queue<int> fila;
	for(int i=1;i<=n;i++) {
		if(grau[i] == 1)
			fila.push(i);
	}

	while(!fila.empty()) {
		int u = fila.front();
		fila.pop();
		
		if(mark[u]) continue;
		mark[u] = true;

		// cout << u << ": " << s[u] << "\n";
		for(auto v : grafo[u]) {
			if(mark[v]) continue;
			grau[v]--;

			ans[mapa[{u, v}]] = s[u], s[v] -= s[u];
			if(grau[v] == 1) fila.push(v);
		}
	}

	vector<int> ciclo;
	for(int i=1;i<=n;i++)
		if(!mark[i]) ciclo.push_back(i);

	if(ciclo.size() == 0) {
		for(int i=1;i<=m;i++)
 			cout << ans[i] << "\n";
 		return 0;
	}
	// cout << "SHITE\n"

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

	vector<int> ordem;
	int k = 0;

	ordem.push_back(ciclo[0]);

	while(k < ordem.size()) {
		int u = ordem[k++];

		if(marca[u]) continue;
		marca[u] = true;

		for(auto v : grafo[u]) {
			if(mark[v] || marca[v]) continue;
			ordem.push_back(v);
			break;
		}
	}

	int sums = 0;
	int val = 1;
	for(auto u : ordem) {
		sums += (s[u] * val);
		val *= -1;
	}
	sums >>= 1;

	ans[mapa[{ordem.back(), ordem.front()}]] = sums;
	int l = sums;

	for(int i = 0; i < (int)ordem.size() - 1;i++) {
		ans[mapa[{ordem[i], ordem[i+1]}]] = s[ordem[i]] - l;
		l = s[ordem[i]] - l;
	}
 	for(int i=1;i<=m;i++)
 		cout << ans[i] << "\n";
	return 0;
}

Compilation message

pipes.cpp: In function 'int32_t main()':
pipes.cpp:80:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(k < ordem.size()) {
        ~~^~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2680 KB Output is correct
2 Correct 4 ms 2680 KB Output is correct
3 Correct 6 ms 2936 KB Output is correct
4 Correct 455 ms 22696 KB Output is correct
5 Correct 5 ms 2684 KB Output is correct
6 Correct 4 ms 2680 KB Output is correct
7 Correct 5 ms 2680 KB Output is correct
8 Correct 4 ms 2680 KB Output is correct
9 Correct 6 ms 2808 KB Output is correct
10 Correct 6 ms 2936 KB Output is correct
11 Correct 6 ms 2936 KB Output is correct
12 Correct 6 ms 2808 KB Output is correct
13 Correct 295 ms 18672 KB Output is correct
14 Correct 359 ms 21600 KB Output is correct
15 Correct 391 ms 22596 KB Output is correct
16 Correct 330 ms 19780 KB Output is correct
17 Correct 398 ms 22472 KB Output is correct
18 Correct 382 ms 22540 KB Output is correct
19 Correct 396 ms 22012 KB Output is correct
20 Correct 4 ms 2680 KB Output is correct
21 Correct 6 ms 2936 KB Output is correct
22 Correct 397 ms 22632 KB Output is correct
23 Correct 303 ms 18728 KB Output is correct
24 Correct 387 ms 22580 KB Output is correct
25 Correct 325 ms 19500 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2684 KB Output is correct
2 Correct 6 ms 2936 KB Output is correct
3 Correct 332 ms 22368 KB Output is correct
4 Correct 4 ms 2680 KB Output is correct
5 Correct 4 ms 2680 KB Output is correct
6 Correct 4 ms 2680 KB Output is correct
7 Correct 4 ms 2680 KB Output is correct
8 Correct 4 ms 2680 KB Output is correct
9 Correct 4 ms 2756 KB Output is correct
10 Correct 4 ms 2680 KB Output is correct
11 Correct 4 ms 2680 KB Output is correct
12 Correct 4 ms 2680 KB Output is correct
13 Correct 4 ms 2680 KB Output is correct
14 Correct 4 ms 2680 KB Output is correct
15 Correct 6 ms 2936 KB Output is correct
16 Correct 6 ms 2940 KB Output is correct
17 Correct 6 ms 2936 KB Output is correct
18 Correct 4 ms 2680 KB Output is correct
19 Correct 4 ms 2808 KB Output is correct
20 Correct 4 ms 2680 KB Output is correct
21 Correct 4 ms 2680 KB Output is correct
22 Correct 6 ms 2936 KB Output is correct
23 Correct 311 ms 20400 KB Output is correct
24 Correct 395 ms 24240 KB Output is correct
25 Correct 320 ms 22384 KB Output is correct
26 Correct 4 ms 2680 KB Output is correct
27 Correct 4 ms 2680 KB Output is correct
28 Correct 4 ms 2680 KB Output is correct
29 Correct 4 ms 2808 KB Output is correct
30 Correct 388 ms 23452 KB Output is correct
31 Correct 405 ms 24820 KB Output is correct
32 Correct 401 ms 24028 KB Output is correct
33 Correct 337 ms 23284 KB Output is correct
34 Correct 4 ms 2744 KB Output is correct
35 Correct 4 ms 2680 KB Output is correct
36 Correct 4 ms 2680 KB Output is correct
37 Correct 4 ms 2680 KB Output is correct
38 Correct 386 ms 23972 KB Output is correct
39 Correct 359 ms 23792 KB Output is correct
40 Correct 395 ms 24560 KB Output is correct
41 Correct 311 ms 23672 KB Output is correct
42 Correct 4 ms 2680 KB Output is correct
43 Correct 4 ms 2680 KB Output is correct
44 Correct 4 ms 2808 KB Output is correct
45 Correct 4 ms 2680 KB Output is correct
46 Correct 402 ms 23788 KB Output is correct
47 Correct 395 ms 24280 KB Output is correct
48 Correct 409 ms 24832 KB Output is correct
49 Correct 342 ms 22300 KB Output is correct
50 Correct 4 ms 2680 KB Output is correct
51 Correct 4 ms 2680 KB Output is correct
52 Correct 4 ms 2680 KB Output is correct
53 Correct 4 ms 2680 KB Output is correct
54 Correct 410 ms 23776 KB Output is correct