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Submission #494902

# Submission time Handle Problem Language Result Execution time Memory
494902 2021-12-17T11:16:17 Z Stickfish Beads and wires (APIO14_beads) C++17
57 / 100
 1000 ms 17864 KB 
#include <iostream>
#include <vector>
using namespace std;

const int MAXN = 2e5 + 123;
const int INF = 1.77013e9;
vector<pair<int, int>> edg[MAXN];
int dp[MAXN][2];

void update(int v, int rt) {
    dp[v][0] = dp[v][1] = 0;
    int rtw = -INF;
    for (auto [u, w] : edg[v]) {
        if (u == rt) {
            rtw = w;
            continue;
        }
        dp[v][0] += max(dp[u][0], dp[u][1]);
    }
    dp[v][1] = dp[v][0];
    if (rtw != -INF) {
        for (auto [u, w] : edg[v]) {
            if (u == rt)
                continue;
            dp[v][1] = max(dp[v][1], dp[v][0] + rtw + w + min(0, dp[u][0] - dp[u][1]));
        }
    }
}

void get_ans(int v, int rt) {
    for (auto [u, w] : edg[v]) {
        if (u == rt) {
            continue;
        }
        get_ans(u, v);
    }
    update(v, rt);
}

int dfs(int v, int rt) {
    int ans = dp[v][0];
    for (auto [u, w] : edg[v]) {
        if (u == rt)
            continue;
        update(v, u);
        update(u, -1);
        ans = max(ans, dfs(u, v));
        update(u, v);
        update(v, -1);
    }
    return ans;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int n;
    cin >> n;
    for (int i = 0; i < n - 1; ++i) {
        int u, v, d;
        cin >> u >> v >> d;
        --u, --v;
        edg[u].push_back({v, d});
        edg[v].push_back({u, d});
    }
    get_ans(0, -1);
    int ans = dfs(0, -1);
    cout << ans << endl;
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 2 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 2 ms 4940 KB Output is correct
6 Correct 2 ms 4940 KB Output is correct
7 Correct 2 ms 4940 KB Output is correct
8 Correct 2 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 2 ms 4940 KB Output is correct
12 Correct 2 ms 4940 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 2 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 2 ms 4940 KB Output is correct
6 Correct 2 ms 4940 KB Output is correct
7 Correct 2 ms 4940 KB Output is correct
8 Correct 2 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 2 ms 4940 KB Output is correct
12 Correct 2 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 3 ms 4940 KB Output is correct
16 Correct 3 ms 4940 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 3 ms 5020 KB Output is correct
19 Correct 3 ms 4940 KB Output is correct
20 Correct 2 ms 4940 KB Output is correct
21 Correct 3 ms 4940 KB Output is correct
22 Correct 3 ms 4940 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 2 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 2 ms 4940 KB Output is correct
6 Correct 2 ms 4940 KB Output is correct
7 Correct 2 ms 4940 KB Output is correct
8 Correct 2 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 2 ms 4940 KB Output is correct
12 Correct 2 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 3 ms 4940 KB Output is correct
16 Correct 3 ms 4940 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 3 ms 5020 KB Output is correct
19 Correct 3 ms 4940 KB Output is correct
20 Correct 2 ms 4940 KB Output is correct
21 Correct 3 ms 4940 KB Output is correct
22 Correct 3 ms 4940 KB Output is correct
23 Correct 5 ms 5196 KB Output is correct
24 Correct 4 ms 5212 KB Output is correct
25 Correct 5 ms 5196 KB Output is correct
26 Correct 8 ms 5452 KB Output is correct
27 Correct 8 ms 5604 KB Output is correct
28 Correct 534 ms 5664 KB Output is correct
29 Correct 230 ms 5672 KB Output is correct
30 Correct 169 ms 5560 KB Output is correct
31 Correct 111 ms 5836 KB Output is correct

Subtask #4
0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 2 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 2 ms 4940 KB Output is correct
6 Correct 2 ms 4940 KB Output is correct
7 Correct 2 ms 4940 KB Output is correct
8 Correct 2 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 2 ms 4940 KB Output is correct
12 Correct 2 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 3 ms 4940 KB Output is correct
16 Correct 3 ms 4940 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 3 ms 5020 KB Output is correct
19 Correct 3 ms 4940 KB Output is correct
20 Correct 2 ms 4940 KB Output is correct
21 Correct 3 ms 4940 KB Output is correct
22 Correct 3 ms 4940 KB Output is correct
23 Correct 5 ms 5196 KB Output is correct
24 Correct 4 ms 5212 KB Output is correct
25 Correct 5 ms 5196 KB Output is correct
26 Correct 8 ms 5452 KB Output is correct
27 Correct 8 ms 5604 KB Output is correct
28 Correct 534 ms 5664 KB Output is correct
29 Correct 230 ms 5672 KB Output is correct
30 Correct 169 ms 5560 KB Output is correct
31 Correct 111 ms 5836 KB Output is correct
32 Correct 29 ms 8008 KB Output is correct
33 Correct 28 ms 8008 KB Output is correct
34 Correct 33 ms 7968 KB Output is correct
35 Correct 196 ms 17548 KB Output is correct
36 Correct 171 ms 17476 KB Output is correct
37 Correct 168 ms 17484 KB Output is correct
38 Execution timed out 1018 ms 17864 KB Time limit exceeded
39 Halted 0 ms 0 KB -