oj.uz

Submission #319020

# Submission time Handle Problem Language Result Execution time Memory
319020 2020-11-03T17:49:35 Z rqi Pipes (BOI13_pipes) C++14
74.0741 / 100
 378 ms 21988 KB 
#include <bits/stdc++.h>

using namespace std;

typedef vector<int> vi;
typedef long long ll;
typedef pair<int, int> pi;
typedef vector<pi> vpi;

#define mp make_pair
#define f first
#define s second
#define pb push_back

struct DSU{
	vi e;
	void init(int n){
		e = vi(n, -1);
	}
	int get(int a){
		if(e[a] < 0) return a;
		e[a] = get(e[a]);
		return e[a];
	}
	bool unite(int a, int b){
		a = get(a);
		b = get(b);
		if(a == b) return 0;
		if(-e[a] < -e[b]) swap(a, b);
		e[b] = a;
		return 1;
	}
};

const int mx = 500005;
const int mx1 = 100005;
int N, M;
ll c[mx1];
int u[mx];
int v[mx];
ll x[mx];

bool inTree[mx1];
vpi adj[mx1];

int depth[mx1];

void genTree(int node, int prv = -1, int d = 0){
	depth[node] = d;
	for(auto u: adj[node]){
		if(u.f == prv) continue;
		genTree(u.f, node, d+1);
		ll val = c[u.f];
		x[u.s]+=val;
		c[u.f]-=val;
		c[node]-=val;
	}
}

int main(){
	cin >> N >> M;
	DSU dsu;
	dsu.init(N+5);
	for(int i = 1; i <= N; i++){
		cin >> c[i];
	}
	for(int i = 1; i <= M; i++){
		cin >> u[i] >> v[i];
		if(dsu.unite(u[i], v[i])){
			inTree[i] = 1;
			adj[u[i]].pb(mp(v[i], i));
			adj[v[i]].pb(mp(u[i], i));
		}
	}

	genTree(1);

	if(M == N-1){
		if(c[1] != 0){
			cout << 0 << "\n";
			return 0;
		}
		for(int i = 1; i <= M; i++){
			cout << 2*x[i] << "\n";
		}
		return 0;
	}

	if(M >= N+1){
		cout << 0 << "\n";
		return 0;
	}

	for(int i = 1; i <= M; i++){
		if(inTree[i]) continue;
		if(depth[u[i]] % 2 != depth[v[i]] % 2){
			cout << 0 << "\n";
			return 0;
		}
	}


	for(int i = 1; i <= M; i++){
		cout << 2*x[i] << "\n";
	}

}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2668 KB Output is correct
2 Correct 2 ms 2688 KB Output is correct
3 Correct 3 ms 2796 KB Output is correct
4 Correct 142 ms 11672 KB Output is correct
5 Correct 2 ms 2796 KB Output is correct
6 Correct 2 ms 2668 KB Output is correct
7 Correct 3 ms 2668 KB Output is correct
8 Correct 2 ms 2668 KB Output is correct
9 Correct 3 ms 2796 KB Output is correct
10 Correct 3 ms 2796 KB Output is correct
11 Correct 4 ms 2796 KB Output is correct
12 Correct 3 ms 2796 KB Output is correct
13 Correct 111 ms 9960 KB Output is correct
14 Correct 130 ms 11236 KB Output is correct
15 Correct 143 ms 11748 KB Output is correct
16 Correct 116 ms 10340 KB Output is correct
17 Correct 143 ms 11752 KB Output is correct
18 Correct 139 ms 11748 KB Output is correct
19 Correct 145 ms 15720 KB Output is correct
20 Correct 2 ms 2668 KB Output is correct
21 Correct 3 ms 2816 KB Output is correct
22 Correct 137 ms 11620 KB Output is correct
23 Correct 105 ms 9828 KB Output is correct
24 Correct 142 ms 11772 KB Output is correct
25 Correct 114 ms 10424 KB Output is correct

Subtask #2
44.0740740741 / 70.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2668 KB Output isn't correct
2 Incorrect 3 ms 2924 KB Output isn't correct
3 Correct 122 ms 13368 KB Output is correct
4 Correct 134 ms 14180 KB Output is correct
5 Correct 123 ms 11108 KB Output is correct
6 Correct 375 ms 21860 KB Output is correct
7 Incorrect 2 ms 2668 KB Output isn't correct
8 Incorrect 2 ms 2796 KB Output isn't correct
9 Correct 2 ms 2668 KB Output is correct
10 Correct 2 ms 2668 KB Output is correct
11 Correct 3 ms 2668 KB Output is correct
12 Correct 2 ms 2668 KB Output is correct
13 Correct 3 ms 2668 KB Output is correct
14 Incorrect 2 ms 2668 KB Output isn't correct
15 Incorrect 3 ms 2924 KB Output isn't correct
16 Incorrect 4 ms 2828 KB Output isn't correct
17 Correct 3 ms 2796 KB Output is correct
18 Correct 3 ms 2796 KB Output is correct
19 Correct 3 ms 2796 KB Output is correct
20 Correct 3 ms 2796 KB Output is correct
21 Correct 4 ms 2796 KB Output is correct
22 Incorrect 3 ms 2796 KB Output isn't correct
23 Incorrect 114 ms 12772 KB Output isn't correct
24 Incorrect 146 ms 15208 KB Output isn't correct
25 Correct 122 ms 13284 KB Output is correct
26 Correct 132 ms 16484 KB Output is correct
27 Correct 132 ms 16996 KB Output is correct
28 Correct 133 ms 11236 KB Output is correct
29 Correct 318 ms 19688 KB Output is correct
30 Incorrect 148 ms 18668 KB Output isn't correct
31 Incorrect 144 ms 18024 KB Output isn't correct
32 Incorrect 141 ms 12776 KB Output isn't correct
33 Correct 134 ms 14692 KB Output is correct
34 Correct 134 ms 15848 KB Output is correct
35 Correct 129 ms 14048 KB Output is correct
36 Correct 128 ms 11152 KB Output is correct
37 Correct 378 ms 21988 KB Output is correct
38 Incorrect 146 ms 14560 KB Output isn't correct
39 Incorrect 140 ms 12428 KB Output isn't correct
40 Incorrect 144 ms 14440 KB Output isn't correct
41 Correct 134 ms 18020 KB Output is correct
42 Correct 132 ms 18148 KB Output is correct
43 Correct 132 ms 15336 KB Output is correct
44 Correct 128 ms 11108 KB Output is correct
45 Correct 300 ms 16740 KB Output is correct
46 Incorrect 146 ms 16832 KB Output isn't correct
47 Incorrect 151 ms 14820 KB Output isn't correct
48 Incorrect 150 ms 18692 KB Output isn't correct
49 Correct 122 ms 11876 KB Output is correct
50 Correct 135 ms 15204 KB Output is correct
51 Correct 128 ms 13028 KB Output is correct
52 Correct 127 ms 12260 KB Output is correct
53 Correct 318 ms 18276 KB Output is correct
54 Incorrect 144 ms 16100 KB Output isn't correct