Submission #1107594

#	Time	Username	Problem	Language	Result	Execution time	Memory
1107594		vjudge1	Magic Tree (CEOI19_magictree)	C++17	0 / 100	3 ms	592 KiB

magictree

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define IOS ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define stdI freopen("input.txt", "r", stdin);
#define stdO freopen("output.txt", "w", stdout);
#define all(x) x.begin(), x.end()
#define mp(x, y) make_pair(x, y)
#define int long long
#define F first
#define S second
using namespace std;
using namespace __gnu_pbds;

template<typename T, template<typename> class order = less>
using ordered_set = tree<T,
    null_type, order<T>, rb_tree_tag,
    tree_order_statistics_node_update>;

typedef pair<int, int> pii;

const int MAXN = 32, MAXLOG = 18, MAXSQ = 500, INF = 1e18, MOD = 1e9 + 7;

vector<int> adj[MAXN];
map<int, int> fru[MAXN];
map<int, int> power[MAXN];
bool mk[MAXN];
int n, m, k, f;

void un(int u, int v)
{
    int ru = u;
    if(power[u].size() < power[v].size())
    {
        swap(u, v);
    }
    for(auto q : power[v])
    {
        power[u][q.F] += q.S;
    }
    if(ru != u)
    {
        swap(power[u], power[ru]);
    }
}

void dfs(int v)
{
    for(auto u : fru[v])
    {
        power[v][u.F] = u.S;
    }
    for(auto u : adj[v])
    {
        dfs(u);
        un(v, u);
        power[u].clear();
    }
    if(mk[v])
    {
        int mx = 0;
        for(auto u : power[v])
        {
            mx = max(mx, u.S);
        }
        f += mx;
        power[v].clear();
    }
}

void solve()
{
    cin >> n >> m >> k;
    for(int i = 2; i <= n; i++)
    {
        int x; cin >> x;
        adj[x].push_back(i);
    }
    for(int i = 0; i < m; i++)
    {
        int v, d, w; cin >> v >> d >> w;
        fru[v][d]++;
    }
    int ans = 0;
    for(int i = 0; i < (1 << n); i++)
    {
        memset(mk, 0, sizeof mk); f = 0;
        int tmp = i;
        if(tmp & 1)
        {
            continue;
        }
        while(tmp)
        {
            int q = __builtin_ctz(tmp);
            tmp ^= (1 << q);
            mk[q + 1] = 1;
        }
        dfs(1);
        ans = max(ans, f);
    }
    cout << ans << "\n";
}

int32_t main()
{
    IOS;
    int t = 1;
    //cin >> t;
    while(t--)
    {
        solve();
    }
    return 0;
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 3
• Subtask 3: 0 / 11
• Subtask 4: 0 / 12
• Subtask 5: 0 / 16
• Subtask 6: 0 / 13
• Subtask 7: 0 / 22
• Subtask 8: 0 / 17