Submission #1083311

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083311		f0rizen	Uzastopni (COCI15_uzastopni)	C++17	160 / 160	71 ms	24144 KiB

uzastopni

#include <bits/stdc++.h>

using namespace std;
using ll = long long;
const int inf = 1e9 + 7;
const ll infll = 1e18;

template<typename T>
istream &operator>>(istream &is, vector<T> &a) {
    for (auto &i : a) {
        is >> i;
    }
    return is;
}

const int N = 100;

vector<int> a;
vector<vector<int>> g;
vector<vector<bitset<N>>> dp;
vector<vector<pair<int, int>>> s;

void dfs(int v) {
    for (auto u : g[v]) {
        dfs(u);
    }
    vector<vector<int>> to(N);
    for (auto u : g[v]) {
        for (auto [l, r] : s[u]) {
            to[l].push_back(r);
        }
    }
    for (int i = N - 1; i >= 0; --i) {
        if (i == a[v]) {
            dp[v][i][i] = 1;
            dp[v][i] |= dp[v][i + 1];
            continue;
        }
        for (auto j : to[i]) {
            if (!(i <= a[v] && a[v] <= j)) {
                dp[v][i][j] = 1;
                dp[v][i] |= dp[v][j + 1];
            }
        }
    }
    for (int i = 0; i < N; ++i) {
        for (int j = i; j < N; ++j) {
            if (i <= a[v] && a[v] <= j && dp[v][i][j]) {
                s[v].push_back({i, j});
            }
        }
    }
}

int32_t main() {
#ifdef LOCAL
    freopen("/tmp/input.txt", "r", stdin);
#else
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
#endif
    int n;
    cin >> n;
    a.resize(n);
    cin >> a;
    for (auto &i : a) {
        --i;
    }
    g.resize(n);
    for (int i = 1; i < n; ++i) {
        int u, v;
        cin >> u >> v;
        --u, --v;
        g[u].push_back(v);
    }
    dp.resize(n, vector<bitset<N>>(N));
    s.resize(n);
    dfs(0);
    cout << s[0].size() << "\n";
    return 0;
}

• Subtask 1: 160 / 160