제출 #764913

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
764913		vjudge1	Roadside Advertisements (NOI17_roadsideadverts)	C++17	7 / 100	1077 ms	26484 KiB

roadsideadverts

//Bismillahir-Rahmanir-Rahim

# include <bits/stdc++.h>
 
# define pb push_back
# define ff first
# define ss second
# define nl "\n"
# define sz(x) ((int)(x).size())
# define deb(x) cerr << #x  << " = " << x << endl; 
# define pll pair <ll, ll>
# define pii pair <int, int>
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
 
const ll maxn = 5e4 + 2;
const ll inf = 2e18 + 0;
const ll mod = 1e9 + 7;
const ll dx[] = {-1, 1, 0, 0};
const ll dy[] = {0, 0, -1, 1};
const ll P = 67;

using namespace std;

ll n, q, timer;
vector <pll> g[maxn];
ll tin[maxn];
ll tout[maxn];
ll up[maxn][17];
ll sum[maxn][17];
ll d[maxn];
map <pll, ll> mp;
bool used[maxn];
ll ww[maxn];

void dfs (ll v = 1, ll pa = 1)
{
    up[v][0] = pa;
    d[v] = d[pa] + 1;
    tin[v] = ++timer;
    for (ll j = 1; j <= 16; ++j)
    {
        up[v][j] = up[up[v][j - 1]][j - 1];
        sum[v][j] = sum[v][j - 1] + sum[up[v][j - 1]][j - 1];
    }
    for (pll it : g[v])
    {
        ll to = it.ff, w = it.ss;
        if (to == pa) continue;
        sum[to][0] = w;
        dfs(to, v);
    }
    tout[v] = timer;
}

bool anc (ll u, ll v)
{
    return tin[u] <= tin[v] && tout[v] <= tout[u];
}

pll lca (ll u, ll v)
{
    if (d[u] < d[v]) swap(u, v);
    ll k = d[u] - d[v];
    ll summ = 0;
    for (ll j = 16; j >= 0; --j)
    {
        if (k & (1LL << j))
        {
            summ += sum[u][j];
            u = up[u][j];
        }
    }
    for (ll j = 16; j >= 0; --j)
    {
        if (up[u][j] != up[v][j])
        {
            summ += sum[u][j];
            summ += sum[u][j];
            u = up[u][j];
            v = up[v][j];
        }
    }
    return {up[v][0], summ};
}

void ma1n (/* SABR */)
{
    cin >> n;
    for (ll i = 1; i < n; ++i)
    {
        ll u, v;
        cin >> u >> v >> ww[i];
        g[u].pb({v, ww[i]});
        g[v].pb({u, ww[i]});
        mp[{u, v}] = i;
        mp[{v, u}] = i;
    }
    dfs();
    cin >> q;
    while (q--)
    {
        vector <ll> v(5);
        for (ll i = 0; i < 5; ++i)
        {
            cin >> v[i];
        }
        ll lc = lca(v[0], v[1]).ff;
        for (ll i = 0; i < 5; ++i)
        {
            for (ll j = i + 1; j < 5; ++j)
            {
                lc = lca(lc, lca(v[i], v[j]).ff).ff;
            }
        }   
        memset(used, 0, sizeof used);
        for (ll i = 0; i < 5; ++i)
        {
            ll cur = v[i];
            while (cur != lc)
            {
                used[mp[{cur, up[cur][0]}]] = 1;
                cur = up[cur][0];
            }
        }
        ll res = 0;
        for (ll i = 1; i < n; ++i)
        {
            if (used[i])
            {
                res += ww[i];
            }
        }
        cout << res << nl;
    }
}
 
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
//  freopen("file.in", "r", stdin);
//  freopen("file.out", "w", stdout);
    int ttt = 1;
//  cin >> ttt;
    for (int test = 1; test <= ttt; ++test)
    {
//      cout << "Case " << test << ":" << '\n';
        ma1n();
    }
    return 0;
}

// 998batrr | BbIWEJI 3A TObOU!!!
// tourist  | BbIWEJI 3A TObOU!!!

• Subtask 1: 7 / 7
• Subtask 2: 0 / 23
• Subtask 3: 0 / 40
• Subtask 4: 0 / 30