Submission #300086

#	Time	Username	Problem	Language	Result	Execution time	Memory
300086		HynDuf	Uzastopni (COCI15_uzastopni)	C++11	160 / 160	6 ms	1408 KiB

uzastopni

#include <bits/stdc++.h>

#define task "U"
#define all(v) (v).begin(), (v).end()
#define rep(i, l, r) for (int i = (l); i <= (r); ++i)
#define Rep(i, r, l) for (int i = (r); i >= (l); --i)
#define DB(X) { cerr << #X << " = " << (X) << '\n'; }
#define DB1(A, _) { cerr << #A << "[" << _ << "] = " << (A[_]) << '\n'; }
#define DB2(A, _, __) { cerr << #A << "[" << _ << "][" << __ << "] = " << (A[_][__]) << '\n'; }
#define DB3(A, _, __, ___) { cerr << #A << "[" << _ << "][" << __ << "][" << ___ << "] = " << (A[_][__][___]) << '\n'; }
#define PR(A, l, r) { cerr << '\n'; rep(_, l, r) DB1(A, _); cerr << '\n';}
#define SZ(x) ((int)(x).size())
#define pb push_back
#define eb emplace_back
#define pf push_front
#define F first
#define S second
#define by(x) [](const auto& a, const auto& b) { return a.x < b.x; } // sort(arr, arr + N, by(a));
#define next ___next
#define prev ___prev
#define y1 ___y1
#define left ___left
#define right ___right
#define y0 ___y0
#define div ___div
#define j0 ___j0
#define jn ___jn

using ll = long long;
using ld = long double;
using ull = unsigned long long;
using namespace std;
typedef pair<int, int> ii;
typedef pair<ii, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<ll> vl;
const int N = 1e4 + 2, NN = 102;
int n, val[N];
bool in[NN];
bitset<NN> l[N], r[N];
vi g[N];
void dfs(int u)
{
    in[val[u]] = 1;
    for (int v : g[u]) if (!in[val[v]]) dfs(v);
    l[u][val[u]] = 1;
    r[u][val[u]] = 1;
    if (SZ(g[u])) sort(all(g[u]), [&](const int &A, const int &B)
    {
        return val[A] < val[B];
    });
    for (int v : g[u]) if (!in[val[v]] && val[v] > val[u])
    {
        rep(i, val[u] + 1, val[v]) if (r[u][i - 1] && l[v][i])
        {
            r[u] |= r[v];
            break;
        }
    }
    if (SZ(g[u])) reverse(all(g[u]));
    for (int v : g[u]) if (!in[val[v]] && val[v] < val[u])
    {
        rep(i, val[v], val[u] - 1) if (r[v][i] && l[u][i + 1])
        {
            l[u] |= l[v];
            break;
        }
    }
    in[val[u]] = 0;
}
int main()
{
#ifdef HynDuf
    freopen(task".in", "r", stdin);
    //freopen(task".out", "w", stdout);
#else
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
#endif
    cin >> n;
    rep(i, 1, n) cin >> val[i];
    rep(i, 2, n)
    {
        int u, v;
        cin >> u >> v;
        g[u].eb(v);
        g[v].eb(u);
    }
    dfs(1);
    cout << l[1].count() * r[1].count();
    return 0;
}

• Subtask 1: 160 / 160