Submission #243443

#	Time	Username	Problem	Language	Result	Execution time	Memory
243443		NONAME	Burza (COCI16_burza)	C++14	160 / 160	273 ms	39544 KiB

burza

#include <bits/stdc++.h>
#define fast_io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie()
using namespace std;
using ll = long long;

int n, k;
bool f[1 << 21], nf[1 << 21], st[25][1 << 21], mk[1 << 21];
vector <int> g[500];

void dfs1(int v, int pr = -1, int d = -1) {
    if (d == k - 1) {
        mk[v] = 1;
        return;
    }

    for (int u : g[v])
        if (u != pr)
            dfs1(u, v, d + 1), mk[v] |= mk[u];
}

void dfs2(int v, int pr = 0, int d = -1) {
    if (!mk[v])
        return;

    if (v)
        memcpy(st[d], f, sizeof(f));

    for (int u : g[v])
        if (u != pr)
            dfs2(u, v, d + 1);

    if (!v)
        return;

    memset(nf, 0, sizeof(nf));

    for (int i = 0; i < (1 << k); ++i)
        if (d == k - 1) {
            if (!(i & (1 << d)))
                nf[i | (1 << d)] |= f[i];
        } else {
            nf[i] |= f[i];
            if (!(i & (1 << d)))
                nf[i | (1 << d)] |= st[d][i];
        }

    memcpy(f, nf, sizeof(nf));
}

int main() {
    fast_io;

    cin >> n >> k;
    for (int i = 0; i < n - 1; ++i) {
        int v, u;
        cin >> v >> u;
        --v, --u;

        g[v].push_back(u);
        g[u].push_back(v);
    }

    dfs1(0);
    if (k * k >= n || !mk[0]) {
        cout << "DA\n";
        return 0;
    }

    f[0] = 1;
    dfs2(0);

    for (int msk = 0; msk < (1 << k); ++msk)
        if (f[msk]) {
            cout << "DA\n";
            return 0;
        }


    cout << "NE\n";
}

• 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