Submission #551984

#	Time	Username	Problem	Language	Result	Execution time	Memory
551984		aadit_ambadkar	Burza (COCI16_burza)	C++11	160 / 160	67 ms	3276 KiB

burza

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
 
vector<int> adj[402], q[402];
int n, k, st[402], dr[402], level[402], pz;
 
void dfs(int u, int p) {
    if (u==p) return;
    if (u) {
        level[u]=level[p]+1;
    }
    if (level[u]==k-1) {
        st[u]=pz++;
        dr[u]=pz;
        return;
    }
    st[u]=pz;
    for (auto i : adj[u]) {
        if (i!=p) dfs(i, u);
    }
    dr[u]=pz;
}
 
bool dp[402][(1<<20)];
 
// bool solve() {
//     dp[0][0]=1;
//     for (int i = 1; i < n; i++) {
//         q[st[i]].push_back(i);
//     }
//     for (int i = 0; i < pz; i++) {
//         for (int j = 0; j < (1<<k); j++) {
//             if (!dp[i][j]) continue;
//             for (auto it : q[i]) {
//                 if (!(j >> level[it] & 1)) {
//                     dp[dr[it]][j | (1<<level[it])]=1;
//                 }
//             }
//         }
//     }
//     for (int j = 0; j < (1<<k); j++) {
//         if (dp[pz][j]) return 1;
//     }
//     return 0;
// }
 
bool solve()
{
    dp[0][0] = 1;
    for(int i = 1; i < n; ++i)
        q[st[i]].push_back(i);
 
    for(int i = 0; i < pz; ++i)
    {
        for(int j = 0; j < (1<<k); ++j)
        {
            if (!dp[i][j])
                continue;
            for(int jj = 0; jj < q[i].size(); ++jj)
            {
                int it = q[i][jj];
                if (!(j >> level[it] & 1))
                    dp[dr[it]][j | (1<<level[it])] = 1;
            }
        }
    }
    for(int j = 0; j < (1<<k); ++j)
        if (dp[pz][j])
            return 1;
 
    return 0;
}
 
int main() {
    cin >> n >> k;
    if (k*k >= n) {
        cout << "DA\n";
        return 0;
    }
    for (int i = 1; i < n; i++) {
        int a, b; cin >> a >> b;
        a--; b--;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    level[0]=-1;
    dfs(0, -1);
    cout << (solve() ? "DA\n" : "NE\n");
}

Compilation message (stderr)

burza.cpp: In function 'bool solve()':
burza.cpp:60:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |             for(int jj = 0; jj < q[i].size(); ++jj)
      |                             ~~~^~~~~~~~~~~~~

• 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