Submission #122625

#	Time	Username	Problem	Language	Result	Execution time	Memory
122625		WhipppedCream	Cats or Dogs (JOI18_catdog)	C++17	38 / 100	3064 ms	7236 KiB

catdog

#include "catdog.h"
#include <bits/stdc++.h>
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
using namespace std;
#define X first
#define Y second
#define pb push_back
typedef pair<int, int> ii;
typedef long long ll;

const int maxn = 1e5+5;

vector<int> adj[maxn];
int dp[3][maxn];
int st[maxn];
int n;

void compute(int u = 1, int p = 0)
{
	dp[1][u] = dp[2][u] = 0;
	for(int v : adj[u]) 
	{
		if(v == p) continue;
		compute(v, u);
		dp[1][u] += min(dp[1][v], 1+dp[2][v]);
		dp[2][u] += min(dp[2][v], 1+dp[1][v]);
	}
	if(st[u] == 1) dp[2][u] = 1e9;
	if(st[u] == 2) dp[1][u] = 1e9;
}

void initialize(int N, vector<int> A, vector<int> B)
{
	n = N;
	for(int i = 0; i< n-1; i++)
	{
		adj[A[i]].pb(B[i]);
		adj[B[i]].pb(A[i]);
	}
}

int cat(int u)
{
	st[u] = 1;
	compute();
	return min(dp[1][1], dp[2][1]);
}

int dog(int u)
{
	st[u] = 2;
	compute();
	return min(dp[1][1], dp[2][1]);

}

int neighbor(int u)
{
	st[u] = 0;
	compute();
	return min(dp[1][1], dp[2][1]);

}

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