Submission #631456

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
631456	2022-08-18T06:57:54 Z	TranGiaHuy1508	Pipes (BOI13_pipes)	C++17	90.9259 / 100	196 ms	41812 KB

pipes

/*
	Unknown's C++ Template (v3.2)
*/

#include "bits/stdc++.h"
using namespace std;

#define int long long

using ll = long long;
using ld = long double;
using ii = pair<int, int>;
using vi = vector<int>;
using vii = vector<ii>;
using vvi = vector<vi>;
using vvii = vector<vii>;
template <class T> using maxpq = priority_queue<T>;
template <class T> using minpq = priority_queue<T, vector<T>, greater<T>>;

#define pb push_back
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define mid ((l+r)>>1)
#define fi first
#define se second

#ifdef LOCAL
	#define debug(x) cout << #x << " = " << x << "\n";
#else
	#define debug(x) ;
#endif

template <class A, class B>
ostream& operator << (ostream& out, pair<A, B> x)
{ out << "(" << x.first << ", " << x.second << ")"; return out; }

template <class T>
ostream& operator << (ostream& out, vector<T> x){
	out << "[";
	for (int i=0; i<sz(x); i++) { out << (i ? ", " : "") << x[i]; }
	out << "]"; return out;
}

template <class T>
istream& operator >> (istream& in, vector<T> &x){
	for (auto &i: x) in >> i;
	return in;
}

const ld PI = acos(-1.0);
const int allmod[3] = {(int)1e9+7, 998244353, (int)1e9+9};
const int mod = allmod[0];
const int maxn = 2e5 + 64;
const ll inf = 1e18;
const ld eps = 1e-6;
const int multitest = 0;

int n, m, root = -1;
vi deg, change, res;
vi pt_order, edge_order;
vii edges;
vvii adj;

void dfs(int x, int p = -1){
	if (x == root && p >= 0) return;
	pt_order.pb(x);

	for (auto k: adj[x]){
		if (k.fi == p) continue;
		if (!deg[k.fi]) continue;
		edge_order.pb(k.se);
		dfs(k.fi, x);
		break;
	}
}

void main_program(){
	cin >> n >> m;

	deg.assign(n, 0); change.resize(n); cin >> change;
	adj.resize(n);
	res.resize(m); edges.resize(m);

	for (int i = 0; i < m; i++){
		int x, y; cin >> x >> y;
		x--; y--;
		deg[x]++; deg[y]++;
		edges[i] = {x, y};
		adj[x].pb({y, i}); adj[y].pb({x, i});
	}

	queue<int> q;
	for (int i = 0; i < n; i++){
		if (deg[i] == 1) q.push(i);
	}

	while (!q.empty()){
		int x = q.front(); q.pop();
		for (auto k: adj[x]){
			if (deg[k.fi]){
				res[k.se] += change[x] * 2;
				change[k.fi] -= change[x];
				deg[k.fi]--;

				if (deg[k.fi] == 1) q.push(k.fi);
			}
		}
		change[x] = 0;
		if (deg[x]) deg[x]--;
	}

	if ((n == m) || (*max_element(all(deg)) == 0)){
		for (int i = 0; i < n; i++){
			assert((deg[i] >= 0));
			if (deg[i] > 0) root = i;
		}

		if (root >= 0){
			dfs(root);

			int tt = 0;
			for (auto i: pt_order) tt += change[i];

			for (int i = 1; i < sz(pt_order); i += 2) tt -= change[pt_order[i]] * 2;

			res[edge_order.back()] = tt;
			for (int i = sz(pt_order) - 1; i >= 1; i--){
				res[edge_order[i-1]] = 2 * change[pt_order[i]] - res[edge_order[i]];
			}
		}

		for (int i = 0; i < m; i++) cout << res[i] << "\n";
	}
	else cout << "0\n";
}

void pre_main(){

}

signed main(){
	#ifdef LOCAL
		auto stime = chrono::high_resolution_clock::now();
	#endif
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	#ifndef ONLINE_JUDGE
		if (fopen(".inp", "r")){
			freopen(".inp", "r", stdin);
			freopen(".out", "w", stdout);
		}
	#endif
	int t = 1; if (multitest) cin >> t;
	pre_main();
	while (t--) main_program();
	#ifdef LOCAL
		auto etime = chrono::high_resolution_clock::now();
		auto duration = chrono::duration_cast<chrono::milliseconds>(etime-stime).count();
		cout << "\n[" << duration << "ms]\n";
	#endif
}

Compilation message

pipes.cpp: In function 'int main()':
pipes.cpp:148:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  148 |    freopen(".inp", "r", stdin);
      |    ~~~~~~~^~~~~~~~~~~~~~~~~~~~
pipes.cpp:149:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  149 |    freopen(".out", "w", stdout);
      |    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1

30.0 / 30.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	212 KB	Output is correct
2	Correct	1 ms	212 KB	Output is correct
3	Correct	1 ms	340 KB	Output is correct
4	Correct	68 ms	12476 KB	Output is correct
5	Correct	0 ms	212 KB	Output is correct
6	Correct	0 ms	212 KB	Output is correct
7	Correct	1 ms	212 KB	Output is correct
8	Correct	1 ms	212 KB	Output is correct
9	Correct	1 ms	340 KB	Output is correct
10	Correct	1 ms	340 KB	Output is correct
11	Correct	1 ms	400 KB	Output is correct
12	Correct	1 ms	340 KB	Output is correct
13	Correct	47 ms	9988 KB	Output is correct
14	Correct	60 ms	11844 KB	Output is correct
15	Correct	61 ms	12488 KB	Output is correct
16	Correct	53 ms	10632 KB	Output is correct
17	Correct	65 ms	12476 KB	Output is correct
18	Correct	62 ms	12520 KB	Output is correct
19	Correct	66 ms	12228 KB	Output is correct
20	Correct	0 ms	212 KB	Output is correct
21	Correct	1 ms	340 KB	Output is correct
22	Correct	59 ms	12520 KB	Output is correct
23	Correct	42 ms	9936 KB	Output is correct
24	Correct	59 ms	12600 KB	Output is correct
25	Correct	52 ms	10420 KB	Output is correct

Subtask #2

60.9259259259 / 70.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	1 ms	468 KB	Output is correct
3	Incorrect	71 ms	15308 KB	Output isn't correct
4	Correct	42 ms	11784 KB	Output is correct
5	Correct	47 ms	11712 KB	Output is correct
6	Correct	196 ms	41812 KB	Output is correct
7	Correct	1 ms	212 KB	Output is correct
8	Correct	0 ms	212 KB	Output is correct
9	Incorrect	1 ms	212 KB	Output isn't correct
10	Correct	0 ms	212 KB	Output is correct
11	Correct	0 ms	212 KB	Output is correct
12	Correct	0 ms	212 KB	Output is correct
13	Correct	1 ms	212 KB	Output is correct
14	Correct	1 ms	212 KB	Output is correct
15	Correct	1 ms	468 KB	Output is correct
16	Correct	1 ms	340 KB	Output is correct
17	Incorrect	1 ms	468 KB	Output isn't correct
18	Correct	1 ms	340 KB	Output is correct
19	Correct	1 ms	340 KB	Output is correct
20	Correct	1 ms	340 KB	Output is correct
21	Correct	1 ms	468 KB	Output is correct
22	Correct	1 ms	468 KB	Output is correct
23	Correct	51 ms	14256 KB	Output is correct
24	Correct	66 ms	16556 KB	Output is correct
25	Incorrect	57 ms	15288 KB	Output isn't correct
26	Correct	50 ms	11888 KB	Output is correct
27	Correct	47 ms	11640 KB	Output is correct
28	Correct	47 ms	12364 KB	Output is correct
29	Correct	145 ms	34264 KB	Output is correct
30	Correct	62 ms	15544 KB	Output is correct
31	Correct	64 ms	19220 KB	Output is correct
32	Correct	63 ms	13720 KB	Output is correct
33	Incorrect	60 ms	16824 KB	Output isn't correct
34	Correct	47 ms	11828 KB	Output is correct
35	Correct	45 ms	11896 KB	Output is correct
36	Correct	60 ms	12060 KB	Output is correct
37	Correct	175 ms	41800 KB	Output is correct
38	Correct	62 ms	16012 KB	Output is correct
39	Correct	64 ms	13144 KB	Output is correct
40	Correct	62 ms	16188 KB	Output is correct
41	Incorrect	73 ms	19232 KB	Output isn't correct
42	Correct	40 ms	11720 KB	Output is correct
43	Correct	41 ms	11604 KB	Output is correct
44	Correct	47 ms	11756 KB	Output is correct
45	Correct	139 ms	36488 KB	Output is correct
46	Correct	69 ms	15548 KB	Output is correct
47	Correct	71 ms	16336 KB	Output is correct
48	Correct	63 ms	18888 KB	Output is correct
49	Incorrect	55 ms	12800 KB	Output isn't correct
50	Correct	44 ms	11864 KB	Output is correct
51	Correct	64 ms	11980 KB	Output is correct
52	Correct	52 ms	11676 KB	Output is correct
53	Correct	145 ms	36380 KB	Output is correct
54	Correct	63 ms	15080 KB	Output is correct