Submission #160729

#	Time	Username	Problem	Language	Result	Execution time	Memory
160729		gs18115	Cats or Dogs (JOI18_catdog)	C++14	0 / 100	4 ms	2680 KiB

catdog

#include"catdog.h"
#include<iostream>
#include<vector>
#include<algorithm>
#define eb emplace_back
#define fi first
#define se second
#define all(x) (x).begin(),(x).end()
#define semicolon ;
#define ryan bear
using namespace std;
typedef long long ll;
typedef pair<int,int>pi;
typedef pair<ll,ll>pl;
const int inf=1e9+7;
int n;
vector<int>adj[100010];
int pa[100010];
void dfs(int x)
{
	for(int t:adj[x])
	{
		adj[t].erase(find(all(adj[t]),x));
		pa[t]=x;
		dfs(t);
	}
	return;
}
void initialize(int N,vector<int>A,vector<int>B)
{
	n=N;
	for(int i=0;i<n-1;i++)
		adj[A[i]].eb(B[i]),adj[B[i]].eb(A[i]);
	dfs(1);
	return;
}
int dp[100010][2];
int col[100010];
void calc(int x)
{
	for(int t:adj[x])
	{
		calc(t);
		dp[x][0]+=min(dp[t][0],dp[t][1]+1);
		dp[x][1]+=min(dp[t][1],dp[t][0]+1);
	}
	if(col[x]==1)
		dp[x][0]=inf;
	if(col[x]==2)
		dp[x][1]=inf;
	return;
}
int cat(int v)
{
	col[v]=1;
	calc(1);
	return min(dp[1][0],dp[1][1]);
}
int dog(int v)
{
	col[v]=2;
	calc(1);
	return min(dp[1][0],dp[1][1]);
}
int neighbor(int v)
{
	col[v]=0;
	calc(1);
	return min(dp[1][0],dp[1][1]);
}

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