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Submission #469921

# Submission time Handle Problem Language Result Execution time Memory
469921 2021-09-02T10:24:20 Z Killer2501 Beads and wires (APIO14_beads) C++14
100 / 100
 181 ms 25292 KB 
#include <bits/stdc++.h>
#define ll int
#define pll pair<ll, ll>
#define pb push_back
#define fi first
#define se second
using namespace std;
const int N = 3e5 + 5;
const ll mod = 1e9 + 7;
ll n, m, a[N], b[N], dp[N], gp[N], tong;
vector<pll> adj[N];
void dfs(ll u, ll p, ll s)
{
    ll sum = 0;
    ll mx1 = -mod, mx2 = -mod;
    for (pll v : adj[u])
    {
        if (v.se == p)
            continue;
        dfs(v.se, u, v.fi);
        sum += max(dp[v.se], gp[v.se]);
        int val = dp[v.se] - max(dp[v.se], gp[v.se]) + v.fi;
        if (mx1 < val)
        {
            mx2 = mx1;
            mx1 = val;
        }
        else if (mx2 < val)
            mx2 = val;
    }
    dp[u] = sum;
    a[u] = sum;
    for (pll v : adj[u])
    {
        if (v.se == p)
            continue;
        int val = dp[u] - max(dp[v.se], gp[v.se]);
        gp[u] = max(gp[u], dp[v.se] + val + v.fi + s);
        int mx = v.fi + dp[v.se] - max(dp[v.se], gp[v.se]);
        if (mx == mx1)
            mx = mx2;
        else
            mx = mx1;
        a[u] = max(a[u], a[v.se] + val + v.fi + mx);
        a[u] = max(a[u], a[v.se] + val);
        for (pll z : adj[v.se])
        {
            if (z.se == u)
                continue;
            int valz = dp[v.se] - max(dp[z.se], gp[z.se]);
            a[u] = max(a[u], val + valz + v.fi + z.fi + a[z.se]);
        }
    }
}
void sol()
{
    cin >> n;
    for (int i = 1; i < n; i++)
    {
        ll x, y, w;
        cin >> x >> y >> w;
        adj[x].pb({w, y});
        adj[y].pb({w, x});
    }
    dfs(1, 0, 0);
    cout << a[1];
}
int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    int test = 1;
    //cin >> test;
    while (test-- > 0)
        sol();
    return 0;
}
/*
10
4 10 2
1 2 21
1 3 13
6 7 1
7 9 5
2 4 3
2 5 8
1 6 55
6 8 34
*/
// ctrl + F8 = compile
// ctrl + F9 = run

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7244 KB Output is correct
2 Correct 4 ms 7372 KB Output is correct
3 Correct 4 ms 7244 KB Output is correct
4 Correct 4 ms 7244 KB Output is correct
5 Correct 4 ms 7372 KB Output is correct
6 Correct 4 ms 7372 KB Output is correct
7 Correct 4 ms 7372 KB Output is correct
8 Correct 4 ms 7368 KB Output is correct
9 Correct 4 ms 7244 KB Output is correct
10 Correct 4 ms 7244 KB Output is correct
11 Correct 5 ms 7372 KB Output is correct
12 Correct 5 ms 7372 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7244 KB Output is correct
2 Correct 4 ms 7372 KB Output is correct
3 Correct 4 ms 7244 KB Output is correct
4 Correct 4 ms 7244 KB Output is correct
5 Correct 4 ms 7372 KB Output is correct
6 Correct 4 ms 7372 KB Output is correct
7 Correct 4 ms 7372 KB Output is correct
8 Correct 4 ms 7368 KB Output is correct
9 Correct 4 ms 7244 KB Output is correct
10 Correct 4 ms 7244 KB Output is correct
11 Correct 5 ms 7372 KB Output is correct
12 Correct 5 ms 7372 KB Output is correct
13 Correct 4 ms 7372 KB Output is correct
14 Correct 4 ms 7368 KB Output is correct
15 Correct 5 ms 7372 KB Output is correct
16 Correct 5 ms 7372 KB Output is correct
17 Correct 4 ms 7372 KB Output is correct
18 Correct 5 ms 7372 KB Output is correct
19 Correct 4 ms 7372 KB Output is correct
20 Correct 4 ms 7372 KB Output is correct
21 Correct 4 ms 7372 KB Output is correct
22 Correct 4 ms 7372 KB Output is correct

Subtask #3
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7244 KB Output is correct
2 Correct 4 ms 7372 KB Output is correct
3 Correct 4 ms 7244 KB Output is correct
4 Correct 4 ms 7244 KB Output is correct
5 Correct 4 ms 7372 KB Output is correct
6 Correct 4 ms 7372 KB Output is correct
7 Correct 4 ms 7372 KB Output is correct
8 Correct 4 ms 7368 KB Output is correct
9 Correct 4 ms 7244 KB Output is correct
10 Correct 4 ms 7244 KB Output is correct
11 Correct 5 ms 7372 KB Output is correct
12 Correct 5 ms 7372 KB Output is correct
13 Correct 4 ms 7372 KB Output is correct
14 Correct 4 ms 7368 KB Output is correct
15 Correct 5 ms 7372 KB Output is correct
16 Correct 5 ms 7372 KB Output is correct
17 Correct 4 ms 7372 KB Output is correct
18 Correct 5 ms 7372 KB Output is correct
19 Correct 4 ms 7372 KB Output is correct
20 Correct 4 ms 7372 KB Output is correct
21 Correct 4 ms 7372 KB Output is correct
22 Correct 4 ms 7372 KB Output is correct
23 Correct 7 ms 7628 KB Output is correct
24 Correct 9 ms 7600 KB Output is correct
25 Correct 7 ms 7632 KB Output is correct
26 Correct 10 ms 7980 KB Output is correct
27 Correct 9 ms 8012 KB Output is correct
28 Correct 9 ms 8020 KB Output is correct
29 Correct 9 ms 7884 KB Output is correct
30 Correct 9 ms 8012 KB Output is correct
31 Correct 9 ms 8396 KB Output is correct

Subtask #4
43.0 / 43.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 7244 KB Output is correct
2 Correct 4 ms 7372 KB Output is correct
3 Correct 4 ms 7244 KB Output is correct
4 Correct 4 ms 7244 KB Output is correct
5 Correct 4 ms 7372 KB Output is correct
6 Correct 4 ms 7372 KB Output is correct
7 Correct 4 ms 7372 KB Output is correct
8 Correct 4 ms 7368 KB Output is correct
9 Correct 4 ms 7244 KB Output is correct
10 Correct 4 ms 7244 KB Output is correct
11 Correct 5 ms 7372 KB Output is correct
12 Correct 5 ms 7372 KB Output is correct
13 Correct 4 ms 7372 KB Output is correct
14 Correct 4 ms 7368 KB Output is correct
15 Correct 5 ms 7372 KB Output is correct
16 Correct 5 ms 7372 KB Output is correct
17 Correct 4 ms 7372 KB Output is correct
18 Correct 5 ms 7372 KB Output is correct
19 Correct 4 ms 7372 KB Output is correct
20 Correct 4 ms 7372 KB Output is correct
21 Correct 4 ms 7372 KB Output is correct
22 Correct 4 ms 7372 KB Output is correct
23 Correct 7 ms 7628 KB Output is correct
24 Correct 9 ms 7600 KB Output is correct
25 Correct 7 ms 7632 KB Output is correct
26 Correct 10 ms 7980 KB Output is correct
27 Correct 9 ms 8012 KB Output is correct
28 Correct 9 ms 8020 KB Output is correct
29 Correct 9 ms 7884 KB Output is correct
30 Correct 9 ms 8012 KB Output is correct
31 Correct 9 ms 8396 KB Output is correct
32 Correct 32 ms 10556 KB Output is correct
33 Correct 34 ms 10544 KB Output is correct
34 Correct 39 ms 10564 KB Output is correct
35 Correct 181 ms 20608 KB Output is correct
36 Correct 173 ms 20676 KB Output is correct
37 Correct 168 ms 20636 KB Output is correct
38 Correct 131 ms 21176 KB Output is correct
39 Correct 140 ms 20320 KB Output is correct
40 Correct 144 ms 20880 KB Output is correct
41 Correct 169 ms 25292 KB Output is correct