제출 #885559

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
885559		parlimoos	Burza (COCI16_burza)	C++14	0 / 160	1 ms	604 KiB

burza

//Be Name KHODA
#pragma GCC optimize("Ofast")
#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;
#define pb push_back
#define pp pop_back
#define lb lower_bound
#define ub upper_bound
#define cl clear
#define bg begin
#define arr(x) array<int , x>
#define endl '\n'

int n , k;
vector<int> tr[400];
bool dp[400][400];
int hs[400];

void init(){
    fill(&hs[0] , &hs[n] , -1);
    queue<int> q;
    q.push(0);
    hs[0] = 0;

    while(!q.empty()){
        int v = q.front();
        q.pop();

        for(int u : tr[v]){
            if(hs[u] == -1){
                hs[u] = hs[v] + 1;
                q.push(u);
            }
        }
    }
}
void f(int v = 0 , int p = -1){
    if(hs[v] >= k){
        dp[v][k] = 1;
    }else{
        for(int u : tr[v]){
            if(u != p){
                f(u , v);
                for(int i = 399 ; i >= 0 ; i--){
                    if(!dp[u][i]) continue;
                    for(int j = i ; j >= hs[v] ; j--){
                        if(!dp[v][j]){
                            dp[v][j] = 1;
                            break;
                        }
                    }
                }
                if(dp[v][hs[v]]) for(int i = hs[v] + 1 ; i < 400 ; i++) dp[v][i] = 0;
            }
        }
    }
}

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);

    cin >> n >> k;
    for(int i = 1 ; i < n ; i++){
        int v , u;
        cin >> v >> u;
        v-- , u--;
        tr[v].pb(u) , tr[u].pb(v);
    }
    init();
    f();
    // for(int i = 0 ; i < n ; i++){
    //     cout << i << " : "; 
    //     for(int j = 0 ; j < 10 ; j++) cout << dp[i][j] << " ";
    //     cout << endl;
    // }
    if(dp[0][0]) cout << "NE";
    else cout << "DA";
}

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