#include<bits/stdc++.h>
#include "catdog.h"
#define pb push_back
#define pli pair<int,int>
#define fi first
#define se second
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL);
using namespace std;
using ll=int;
const ll maxN=2e5;
const ll inf=1e18;
const ll mod=1e9+7;
ll a[maxN],dp[maxN][3];
vector<ll>g[maxN];
ll ans=0;
void dfs(ll u,ll p=0)
{
if(a[u]==0)
{
dp[u][1]=dp[u][2]=dp[u][0]=0;
}
if(a[u]==1)
{
dp[u][1]=0;
dp[u][2]=dp[u][0]=inf;
}
if(a[u]==2)
{
dp[u][2]=0;
dp[u][1]=dp[u][0]=inf;
}
for(int v:g[u])
{
if(v!=p)
{
dfs(v,u);
dp[u][0]+=min({dp[v][0],dp[v][1]+1,dp[v][2]+1});
dp[u][1]+=min({dp[v][1],dp[v][0],dp[v][2]+1});
dp[u][2]+=min({dp[v][2],dp[v][0],dp[v][1]+1});
}
}
}
void initialize(int n,vector<int> A,vector<int>B)
{
for(int i=0;i<n-1;i++)
{
g[A[i]].pb(B[i]);
g[B[i]].pb(A[i]);
}
for(int i=1;i<=n;i++)
{
a[i]=0;
}
}
ll cat(int v)
{
a[v]=1;
ans=0;
dfs(1);
return min({dp[1][1],dp[1][0],dp[1][2]});
}
ll dog(int v)
{
a[v]=2;
ans=0;
dfs(1);
return min({dp[1][1],dp[1][0],dp[1][2]});;
}
ll neighbor(int v)
{
a[v]=0;
ans=0;
dfs(1);
return min({dp[1][1],dp[1][0],dp[1][2]});
}
/*int main()
{
fastio
//freopen(TASKNAME".INP","r",stdin);
//freopen(TASKNAME".OUT","w",stdout);
initialize(5,{1,2,2,4},{2,3,4,5});
cat(3),dog(5);
cat(2),dog(1);
cout << dog(1);
}*/
Compilation message
catdog.cpp:11:14: warning: overflow in conversion from 'double' to 'll' {aka 'int'} changes value from '1.0e+18' to '2147483647' [-Woverflow]
11 | const ll inf=1e18;
| ^~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
4948 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
4948 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
4948 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
