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Submission #239746

# Submission time Handle Problem Language Result Execution time Memory
239746 2020-06-17T08:37:13 Z neihcr7j Beads and wires (APIO14_beads) C++14
100 / 100
 193 ms 22636 KB 
#include<bits/stdc++.h>

#define oo 1000000000
#define maxn 200005

using namespace std;
typedef long long ll;

int n;

vector < pair < int, int > > g[maxn];

int dp[maxn][4];

void dfs(int u, int du) {
  dp[u][0] = dp[u][1] = 0;
  dp[u][2] = dp[u][3] = -oo;

  for (auto i : g[u]) {
    int v = i.first, w = i.second;
    if (du == v) continue;

    dfs(v, u);

    int a = max(dp[u][0] + max(dp[v][1], dp[v][2] + w), dp[u][1] + dp[v][3] + w);

    a = max(a, max(dp[u][2] + max(dp[v][0], dp[v][1]), dp[u][3] + dp[v][1]) + w);
    a = max(a, dp[u][1] + max(dp[v][0], dp[v][1]));

    int b = dp[u][1] + max(dp[v][1], dp[v][2] + w);
    int c = max(dp[u][2] + max(dp[v][2] + w, dp[v][1]), dp[u][1] + dp[v][1] + w);
    int d = max(dp[u][3] + max(dp[v][2] + w, dp[v][1]), dp[u][1] + max(dp[v][0], dp[v][1]) + w);

    dp[u][0] = a;
    dp[u][1] = b;
    dp[u][2] = c;
    dp[u][3] = d;

    //if (u == 1) cerr << a << ' ' << b << ' ' << c <<  ' ' << d << '\n';
  }
}

int main(){
  #define TASK "ABC"
  //freopen(TASK".inp", "r", stdin); freopen(TASK".out", "w", stdout);
  ios_base::sync_with_stdio(0);

  cin >> n;

  for (int i = 1; i < n; ++i) {
    int u, v, c;
    cin >> u >> v >> c;

    g[u].push_back({v, c});
    g[v].push_back({u, c});
  }

  int root = 1;
  dfs(root, root);

  //cerr << dp[8][1] << '\n';

  cout << max(dp[root][0], dp[root][1]);

  return 0;
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 4992 KB Output is correct
2 Correct 8 ms 4992 KB Output is correct
3 Correct 7 ms 4992 KB Output is correct
4 Correct 8 ms 4992 KB Output is correct
5 Correct 7 ms 5120 KB Output is correct
6 Correct 7 ms 4992 KB Output is correct
7 Correct 7 ms 4992 KB Output is correct
8 Correct 7 ms 4992 KB Output is correct
9 Correct 7 ms 4992 KB Output is correct
10 Correct 7 ms 5120 KB Output is correct
11 Correct 7 ms 4992 KB Output is correct
12 Correct 7 ms 5120 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 4992 KB Output is correct
2 Correct 8 ms 4992 KB Output is correct
3 Correct 7 ms 4992 KB Output is correct
4 Correct 8 ms 4992 KB Output is correct
5 Correct 7 ms 5120 KB Output is correct
6 Correct 7 ms 4992 KB Output is correct
7 Correct 7 ms 4992 KB Output is correct
8 Correct 7 ms 4992 KB Output is correct
9 Correct 7 ms 4992 KB Output is correct
10 Correct 7 ms 5120 KB Output is correct
11 Correct 7 ms 4992 KB Output is correct
12 Correct 7 ms 5120 KB Output is correct
13 Correct 7 ms 5120 KB Output is correct
14 Correct 7 ms 4992 KB Output is correct
15 Correct 10 ms 4992 KB Output is correct
16 Correct 8 ms 4992 KB Output is correct
17 Correct 7 ms 5120 KB Output is correct
18 Correct 7 ms 5120 KB Output is correct
19 Correct 8 ms 4992 KB Output is correct
20 Correct 7 ms 5120 KB Output is correct
21 Correct 7 ms 4992 KB Output is correct
22 Correct 7 ms 5120 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 4992 KB Output is correct
2 Correct 8 ms 4992 KB Output is correct
3 Correct 7 ms 4992 KB Output is correct
4 Correct 8 ms 4992 KB Output is correct
5 Correct 7 ms 5120 KB Output is correct
6 Correct 7 ms 4992 KB Output is correct
7 Correct 7 ms 4992 KB Output is correct
8 Correct 7 ms 4992 KB Output is correct
9 Correct 7 ms 4992 KB Output is correct
10 Correct 7 ms 5120 KB Output is correct
11 Correct 7 ms 4992 KB Output is correct
12 Correct 7 ms 5120 KB Output is correct
13 Correct 7 ms 5120 KB Output is correct
14 Correct 7 ms 4992 KB Output is correct
15 Correct 10 ms 4992 KB Output is correct
16 Correct 8 ms 4992 KB Output is correct
17 Correct 7 ms 5120 KB Output is correct
18 Correct 7 ms 5120 KB Output is correct
19 Correct 8 ms 4992 KB Output is correct
20 Correct 7 ms 5120 KB Output is correct
21 Correct 7 ms 4992 KB Output is correct
22 Correct 7 ms 5120 KB Output is correct
23 Correct 11 ms 5376 KB Output is correct
24 Correct 10 ms 5376 KB Output is correct
25 Correct 10 ms 5376 KB Output is correct
26 Correct 12 ms 5760 KB Output is correct
27 Correct 12 ms 5760 KB Output is correct
28 Correct 11 ms 5760 KB Output is correct
29 Correct 11 ms 5760 KB Output is correct
30 Correct 12 ms 5760 KB Output is correct
31 Correct 12 ms 6016 KB Output is correct

Subtask #4
43.0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 4992 KB Output is correct
2 Correct 8 ms 4992 KB Output is correct
3 Correct 7 ms 4992 KB Output is correct
4 Correct 8 ms 4992 KB Output is correct
5 Correct 7 ms 5120 KB Output is correct
6 Correct 7 ms 4992 KB Output is correct
7 Correct 7 ms 4992 KB Output is correct
8 Correct 7 ms 4992 KB Output is correct
9 Correct 7 ms 4992 KB Output is correct
10 Correct 7 ms 5120 KB Output is correct
11 Correct 7 ms 4992 KB Output is correct
12 Correct 7 ms 5120 KB Output is correct
13 Correct 7 ms 5120 KB Output is correct
14 Correct 7 ms 4992 KB Output is correct
15 Correct 10 ms 4992 KB Output is correct
16 Correct 8 ms 4992 KB Output is correct
17 Correct 7 ms 5120 KB Output is correct
18 Correct 7 ms 5120 KB Output is correct
19 Correct 8 ms 4992 KB Output is correct
20 Correct 7 ms 5120 KB Output is correct
21 Correct 7 ms 4992 KB Output is correct
22 Correct 7 ms 5120 KB Output is correct
23 Correct 11 ms 5376 KB Output is correct
24 Correct 10 ms 5376 KB Output is correct
25 Correct 10 ms 5376 KB Output is correct
26 Correct 12 ms 5760 KB Output is correct
27 Correct 12 ms 5760 KB Output is correct
28 Correct 11 ms 5760 KB Output is correct
29 Correct 11 ms 5760 KB Output is correct
30 Correct 12 ms 5760 KB Output is correct
31 Correct 12 ms 6016 KB Output is correct
32 Correct 36 ms 8440 KB Output is correct
33 Correct 43 ms 8440 KB Output is correct
34 Correct 39 ms 8440 KB Output is correct
35 Correct 187 ms 19192 KB Output is correct
36 Correct 188 ms 19192 KB Output is correct
37 Correct 193 ms 19192 KB Output is correct
38 Correct 134 ms 19556 KB Output is correct
39 Correct 137 ms 19544 KB Output is correct
40 Correct 177 ms 19428 KB Output is correct
41 Correct 188 ms 22636 KB Output is correct