제출 #851293

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
851293		c2zi6	Burza (COCI16_burza)	C++14	160 / 160	353 ms	12636 KiB

burza

#include <bits/stdc++.h>

using namespace std;
using ll = long long;
using ld = long double;

int n, k;
vector<vector<int>> gp;
vector<int> d;
vector<bool> lav;
vector<int> l, r;
int last;

void dfs(int u = 0, int p = -1) {
    if (p == -1) d[u] = 0;
    else d[u] = d[p] + 1;
    
    if (d[u] == k) {
        lav[u] = true;
        l[u] = last;
        r[u] = last;
        last++;
        return;
    }

    for (int v : gp[u]) {
        if (v == p) continue;
        dfs(v, u);
        lav[u] = (lav[u] | lav[v]);
        r[u] = max(r[u], r[v]);
        l[u] = min(l[u], l[v]);
    }
}

void solve() {
    cin >> n >> k;
    gp = vector<vector<int>>(n);
    for (int i = 1; i < n; i++) {
        int u, v;
        cin >> u >> v;
        u--, v--;
        gp[u].push_back(v);
        gp[v].push_back(u);
    }
    if (k > 20) {
        cout << "DA" << endl;
        return;
    }
    d = vector<int>(n);
    l = vector<int>(n, 2e9);
    r = vector<int>(n, -2e9);
    lav = vector<bool>(n);
    last = 0;
    dfs();

    // for (int i = 0; i < n; i++) {
    //     if (!lav[i]) continue;
    //     cout << i+1 << " " << l[i] << "-" << r[i] << endl;
    // }
    // cout << "VERJ" << endl;
    
    int lbyr[k][last];
    for (int i = 0; i < k; i++) {
        for (int j = 0; j < last; j++) {
            lbyr[i][j] = -1;
        }
    }

    for (int i = 1; i < n; i++) {
        if (!lav[i]) continue;
        lbyr[d[i]-1][r[i]] = l[i];
    }

    bool ans = false;
    bool dp[1<<k][last]{};
    for (int s = 1; s < (1<<k); s++) {
        for (int i = 0; i < last; i++) {
            dp[s][i] = false;
            for (int j = 0; j < k; j++) {
                if (!(s & (1<<j))) continue;
                if (lbyr[j][i] == -1) continue;
                if (lbyr[j][i] == 0) {
                    dp[s][i] = true;
                    break;
                }
                if (dp[s^(1<<j)][lbyr[j][i]-1]) {
                    dp[s][i] = true;
                    break;
                }
            }
            if (dp[s][i] && i == last-1) {
                ans = true;
            }
        }
    }
    if (ans) cout << "DA" << endl;
    else cout << "NE" << endl;
}

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

• Subtask 1: 16 / 16
• Subtask 2: 16 / 16
• Subtask 3: 16 / 16
• Subtask 4: 16 / 16
• Subtask 5: 16 / 16
• Subtask 6: 16 / 16
• Subtask 7: 16 / 16
• Subtask 8: 16 / 16
• Subtask 9: 16 / 16
• Subtask 10: 16 / 16