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Submission #1051017

# Submission time Handle Problem Language Result Execution time Memory
1051017 2024-08-09T18:23:35 Z ortsac Pipes (BOI13_pipes) C++17
67.5926 / 100
 91 ms 39340 KB 
#include <bits/stdc++.h>
 
using namespace std;

#define int long long
#define pii pair<long long, long long>
#define fr first
#define se second

const int MAXN = 1e5 + 10;
const int MAXM = 5e5 + 10;
vector<pii> adj[MAXN];
int bEdge = -1;
vector<pii> edges;
int h[MAXN];
int change[MAXN];
bool vis[MAXN];
int dad[MAXN];
int dp[MAXN];
int peso[MAXM];

void dfs(int node) {
    vis[node] = 1;
    for (auto [u, z] : adj[node]) {
        if (u == dad[node]) continue;
        if (vis[u]) bEdge = z;
        else {
            dad[u] = node;
            h[u] = h[node] + 1;
            dfs(u);
        }
    }
}

void calc(int node) {
    vis[node] = 1;
    for (auto [u, z] : adj[node]) {
        if (vis[u]) continue;
        calc(u);
        dp[node] += (change[u] - dp[u]);
        peso[z] += (change[u] - dp[u]);
    }
}

int32_t main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    for (int i = 1; i <= n; i++) cin >> change[i];
    for (int i = 0; i < m; i++) {
        int a, b;
        cin >> a >> b;
        edges.push_back({a, b});
        adj[a].push_back({b, i});
        adj[b].push_back({a, i});
    }
    if (m > (n + 1)) {
        cout << "0\n";
        return 0;
    }
    dfs(1);
    if (bEdge != -1) {
        auto u = edges[bEdge];
        int a = u.fr, b = u.se;
        if (h[a] > h[b]) swap(a, b);
        // a is higher than b
        int oa = a, ob = b;
        while (h[b] > h[a]) {
            b = dad[b];
        }
        while (a != b) {
            a = dad[a];
            b = dad[b];
        }
        int lca = a;
        if (lca == 1) {
            cout << "0\n";
            return 0;
        }
        a = oa;
        b = ob;
        int tam = h[a] + h[b] - 2*h[lca] + 1;
        if ((tam % 2LL) == 0) {
            cout << "0\n";
            return 0;
        }
    }
    memset(vis, 0, sizeof vis);
    calc(1);
    if (dp[1] == change[1]) {
        for (int i = 0; i < m; i++) cout << 2*peso[i] << "\n";
        return 0;
    }
    if (bEdge == -1) {
        cout << "0\n";
        return 0;
    }
    //cout << "0\n";
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 5468 KB Output is correct
2 Correct 1 ms 5468 KB Output is correct
3 Correct 1 ms 5720 KB Output is correct
4 Correct 35 ms 16984 KB Output is correct
5 Correct 1 ms 5468 KB Output is correct
6 Correct 1 ms 5468 KB Output is correct
7 Correct 1 ms 5468 KB Output is correct
8 Correct 1 ms 5468 KB Output is correct
9 Correct 1 ms 5724 KB Output is correct
10 Correct 1 ms 5724 KB Output is correct
11 Correct 1 ms 5724 KB Output is correct
12 Correct 1 ms 5724 KB Output is correct
13 Correct 31 ms 13736 KB Output is correct
14 Correct 36 ms 14792 KB Output is correct
15 Correct 32 ms 15308 KB Output is correct
16 Correct 30 ms 14276 KB Output is correct
17 Correct 33 ms 16836 KB Output is correct
18 Correct 31 ms 17100 KB Output is correct
19 Correct 38 ms 20928 KB Output is correct
20 Correct 1 ms 5468 KB Output is correct
21 Correct 1 ms 5708 KB Output is correct
22 Correct 30 ms 17088 KB Output is correct
23 Correct 26 ms 13720 KB Output is correct
24 Correct 38 ms 15300 KB Output is correct
25 Correct 25 ms 15808 KB Output is correct

Subtask #2
37.5925925926 / 70.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 5468 KB Output isn't correct
2 Incorrect 1 ms 5724 KB Output isn't correct
3 Correct 30 ms 14540 KB Output is correct
4 Correct 28 ms 17100 KB Output is correct
5 Correct 21 ms 11980 KB Output is correct
6 Correct 91 ms 39292 KB Output is correct
7 Incorrect 1 ms 5464 KB Output isn't correct
8 Incorrect 1 ms 5468 KB Output isn't correct
9 Correct 1 ms 5468 KB Output is correct
10 Correct 1 ms 5468 KB Output is correct
11 Incorrect 1 ms 5468 KB Output isn't correct
12 Correct 1 ms 5468 KB Output is correct
13 Correct 1 ms 5468 KB Output is correct
14 Incorrect 1 ms 5468 KB Output isn't correct
15 Incorrect 1 ms 5724 KB Output isn't correct
16 Incorrect 1 ms 5672 KB Output isn't correct
17 Correct 1 ms 5724 KB Output is correct
18 Incorrect 1 ms 5724 KB Output isn't correct
19 Correct 1 ms 5724 KB Output is correct
20 Correct 1 ms 5720 KB Output is correct
21 Correct 2 ms 5720 KB Output is correct
22 Incorrect 1 ms 5724 KB Output isn't correct
23 Incorrect 25 ms 14284 KB Output isn't correct
24 Incorrect 26 ms 15636 KB Output isn't correct
25 Correct 29 ms 14528 KB Output is correct
26 Incorrect 37 ms 20100 KB Output isn't correct
27 Correct 29 ms 16832 KB Output is correct
28 Correct 23 ms 12572 KB Output is correct
29 Correct 71 ms 32768 KB Output is correct
30 Incorrect 34 ms 23232 KB Output isn't correct
31 Incorrect 29 ms 17856 KB Output isn't correct
32 Incorrect 28 ms 13260 KB Output isn't correct
33 Correct 33 ms 15812 KB Output is correct
34 Incorrect 36 ms 19396 KB Output isn't correct
35 Correct 29 ms 16924 KB Output is correct
36 Correct 26 ms 12440 KB Output is correct
37 Correct 90 ms 39340 KB Output is correct
38 Incorrect 32 ms 16832 KB Output isn't correct
39 Incorrect 27 ms 15708 KB Output isn't correct
40 Incorrect 32 ms 20420 KB Output isn't correct
41 Correct 32 ms 17752 KB Output is correct
42 Correct 33 ms 16068 KB Output is correct
43 Correct 32 ms 17384 KB Output is correct
44 Correct 21 ms 11980 KB Output is correct
45 Correct 68 ms 37276 KB Output is correct
46 Incorrect 30 ms 18336 KB Output isn't correct
47 Incorrect 33 ms 18888 KB Output isn't correct
48 Incorrect 32 ms 17608 KB Output isn't correct
49 Correct 23 ms 12696 KB Output is correct
50 Correct 27 ms 15896 KB Output is correct
51 Incorrect 31 ms 17308 KB Output isn't correct
52 Correct 24 ms 12232 KB Output is correct
53 Correct 75 ms 35648 KB Output is correct
54 Incorrect 32 ms 20076 KB Output isn't correct