This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include "catdog.h"
#include<bits/stdc++.h>
using namespace std;
int n;
vector<int> con[100005];
int dp[100005][3];
int tip[100005];
void dfs(int nod, int par)
{
if(tip[nod]==0)
{
dp[nod][0]=0;
dp[nod][1]=0;
dp[nod][2]=0;
}
else if(tip[nod]==1)
{
dp[nod][0]=1;
dp[nod][1]=0;
dp[nod][2]=1;
}
else
{
dp[nod][0]=1;
dp[nod][1]=1;
dp[nod][2]=0;
}
for(auto adj:con[nod])
{
if(adj!=par)
{
dfs(adj,nod);
dp[nod][0] += min({dp[adj][0],dp[adj][1]+1,dp[adj][2]+1});
dp[nod][1] += min({dp[adj][0],dp[adj][1],dp[adj][2]+1});
dp[nod][2] += min({dp[adj][0],dp[adj][1]+1,dp[adj][2]});
}
}
}
void initialize(int N, std::vector<int> A, std::vector<int> B)
{
n=N;
for(int i=0;i<n-1;i++)
{
con[A[i]].push_back(B[i]);
con[B[i]].push_back(A[i]);
}
}
int cat(int v)
{
tip[v]=1;
dfs(1,0);
return min({dp[1][0],dp[1][1],dp[1][2]});
}
int dog(int v)
{
tip[v]=2;
dfs(1,0);
return min({dp[1][0],dp[1][1],dp[1][2]});
}
int neighbor(int v)
{
tip[v]=0;
dfs(1,0);
return min({dp[1][0],dp[1][1],dp[1][2]});
}
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