Submission #252920

#	Time	Username	Problem	Language	Result	Execution time	Memory
252920		test2	Cats or Dogs (JOI18_catdog)	C++14	0 / 100	4 ms	3840 KiB

catdog

#include <bits/stdc++.h>
#include "catdog.h"

using namespace std;

const int N = 1e5 + 7;
int n;

vector<int> adj[N] ; 
int hut[N] ; 
int x;
int dp[N][3] ; 

void initialize(int N, std::vector<int> A, std::vector<int> B)
{
        x = A.size();
        for(int i = 0 ; i < N - 1;i ++){
                adj[A[i]].push_back(B[i]) ;
                adj[B[i]].push_back(A[i]) ; 
        }

        return ; 
}

int sub[N] ; 

void dfz(int x, int p ){
        sub[x] = hut[x] ; 
        for(auto u : adj[x]){
                if( u == p)
                        continue ; 
                dfz(u , x) ; 
                sub[x] |= sub[u] ; 
        }
        return ; 
}

int dfs(int x ,int p){
        if( x != p && sub[x] != 3 && (sub[x]|hut[p]) == 3 ){
                return 1 ; 
        }
        int ret = 0 ;         
        
        for(auto u:adj[x] ){
                if( u == p) 
                        continue ; 
                ret += dfs(u , x) ; 
        }

        return ret ; 
}

int answer(){
        dfz(1 , 1) ;
        return dfs(1 , 1) ; 
}

int cat(int v)
{
        hut[v] = 1 ;
        return answer() ;
}

int dog(int v)
{
        hut[v] = 2 ; 
        return answer() ;
}

int neighbor(int v)
{
        memset(dp  , -1 , sizeof dp) ; 
        hut[v] = 0 ; 
        return answer();
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 30
• Subtask 3: 0 / 62