Submission #555737

#	Time	Username	Problem	Language	Result	Execution time	Memory
555737		new_acc	Zapina (COCI20_zapina)	C++14	0 / 110	1 ms	340 KiB

zapina

#include<bits/stdc++.h>
#define fi first
#define se second
#define pitem item*
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef vector<ll> vl;
const int N=400+10;
const int SS=1<<19;
const int INFi=2e9;
const ll INFl=1e13;
const ll mod2=998244353;
const ll mod=1e9+7;
const ll mod3=1000696969;
const ll p=70032301;
const ull p2=913;
const int L=20;
bitset<(1<<20)+1> dp[N*2][2];
bool pod[N],level[N];
vi graf[N];
int n,k,wsk,pierw[N];
void dfs(int v,int o){
    if(level[v]==k) pod[v]=1;
    for(auto u:graf[v]){
        if(u==o) continue;
        level[u]=level[v]+1;
        dfs(u,v);
        pod[v]|=pod[u];
    }
}
void dfs2(int v,int o){
    wsk++;
    pierw[v]=wsk;
    if(v!=1){
        for(int i=0;i<(1<<(k+1));i++){
            if(i&(1<<level[v])) dp[wsk][1][i]=min(dp[wsk-1][1][i],dp[wsk-1][0][i-(1<<level[v])]); 
            else dp[wsk][1][i]=dp[wsk-1][1][i];
        }
        if(level[v]!=k) dp[wsk][0]=dp[wsk-1][0];
        else dp[wsk][0]=dp[wsk][1];
    }
    for(auto u:graf[v]){
        if(u==o or !pod[u] or level[u]>k) continue;
        dfs2(u,v);
    }
    if(v==1) return;
    wsk++;
    dp[wsk][0]=dp[wsk-1][0],dp[wsk][1]=dp[pierw[o]][1]; 
}
void solve(){
    cin>>n>>k;
    for(int a,b,i=1;i<n;i++){
        cin>>a>>b;
        graf[a].push_back(b),graf[b].push_back(a);
    }
    if(k*k>=n){
        cout<<"DA\n";
        return;
    }
    dfs(1,1);
    for(int i=0;i<(1<<(k+1));i++) dp[1][0][i]=1;
    dfs2(1,1);
    cout<<(dp[wsk][0][(1<<(k+1))-1]?"DA":"NE")<<"\n";
}
int main(){
    ios_base::sync_with_stdio(0),cin.tie(0);
    int tt=1;
    while(tt--) solve();
}

• Subtask 1: 0 / 22
• Subtask 2: 0 / 33
• Subtask 3: 0 / 55