Submission #589488

#	Time	Username	Problem	Language	Result	Execution time	Memory
589488		BhavayGoyal	Burza (COCI16_burza)	C++14	160 / 160	214 ms	210044 KiB

burza

#include <bits/stdc++.h>
using namespace std;

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

template<class T> using oset = 
            tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#define ll long long
#define ld long double
#define ar array
#define vi vector<int>
#define vii vector<vector<int>>
#define pii pair<int, int>
#define pb push_back
#define all(x) x.begin(), x.end()
#define f first
#define s second

const int MOD = 1e9+7;
const int inf = 1e9;
const ll linf = 1e18;

const int d4i[4]={-1, 0, 1, 0}, d4j[4]={0, 1, 0, -1};
const int d8i[8]={-1, -1, 0, 1, 1, 1, 0, -1}, d8j[8]={0, 1, 1, 1, 0, -1, -1, -1};


// -------------------------------------------------- Main Code --------------------------------------------------

const int N = 401;
vi g[N];
int n, k, ct = 0, depth[N], Left[N], Right[N], dp[N][(1<<20)];

void dfs(int src = 0, int par = -1) {
    Left[src] = inf;
    Right[src] = -inf;
    if (depth[src] == k) {
        Left[src] = ++ct;
        Right[src] = ct;
    }
    for (auto ch : g[src]) {
        if (ch == par) continue;
        depth[ch] = depth[src]+1;
        dfs(ch, src);
        Left[src] = min(Left[src], Left[ch]);
        Right[src] = max(Right[src], Right[ch]);
    }
}

void dfs1(int src = 0, int par = -1) {
    if (depth[src] > k) return;
    for (auto ch : g[src]) {
        if (ch == par) continue;
        dfs1(ch, src);
    }
    if (src == 0 || Left[src] == inf) return;

    int d = depth[src]-1;
    for (int mask = 0; mask < (1<<k); mask++) {
        if (mask&(1<<d)) {
            dp[Right[src]][mask] = max(dp[Right[src]][mask], dp[Left[src]-1][mask^(1<<d)] + Right[src]-Left[src]+1);
        }
    }
}

void sol() {
    cin >> n >> k;
    for (int i = 0; i < n-1; i++) {
        int a, b; cin >> a >> b;
        g[--a].pb(--b);
        g[b].pb(a);
    }

    if (k >= 20) {
        cout << "DA" << endl;
        return;
    }
    
    dfs();
    for (int i = 0; i < n; i++) for (int j = 0; j < (1<<k); j++) dp[i][j] = -inf;
    dp[0][0] = 0;
    dfs1();
    for (int i = 0; i < (1<<k); i++) {
        if (dp[ct][i] == ct) {
            cout << "DA" << endl;
            return;
        }
    }
    cout << "NE" << endl;
}

int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int t = 1;
    // cin >> t; 
    while (t--) {
        sol();
    }
    return 0;
}

• 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