/*
..
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. ^G~:^^:::::::^:^^^^^:::::::::^:::::::::::::::^^::75^
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:!!~:.:^^:
PENGUIN SO CUTE, I LOVE PENGUIN
*/
#include<bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define NAME ""
#define int long long
#define ii pair<int,int>
const int oo=1e9;
const int mod=1e9+7;
const int N=1e5;
const int LG=18;
const int Sqrt=350;
//int hx[]={0,0,1,-1,1,1,-1,-1},hy[]={1,-1,0,0,1,-1,1,-1};
int n,dp[N+5][2][2][2][2],p[N+5],A,B;
vector<int>graph[N+5];
int find(int v)
{
if(p[v]==0)return v;
return p[v]=find(p[v]);
}
bool union_(int a,int b)
{
a=find(a);
b=find(b);
if(a==b)return false;
p[b]=a;
return true;
}
int cal(int u,int x,int y,int z,int t,int pre)
{
int &res=dp[u][x][y][z][t];
if(res!=-1)return res;
if(u==A&&x!=z)return res=oo;
if(u==B&&x!=t)return res=oo;
if(u==B&&z&&t)return res=oo;
bool kt=false;
if(y)kt=true;
if(u==A&&t)kt=true;
if(u==B&&z)kt=true;
int sum=x;
for(int v:graph[u])
if(v!=pre)sum+=cal(v,0,x,z,t,u);
res=oo;
if(kt)res=sum;
else
{
for(int v:graph[u])
if(v!=pre)res=min(res,sum-cal(v,0,x,z,t,u)+cal(v,1,x,z,t,u));
}
return res;
}
main()
{
ios_base::sync_with_stdio(false);
cin.tie(0),cout.tie(0);
//freopen(""NAME".inp","r",stdin);
//freopen(""NAME".out","w",stdout);
cin>>n;
for(int i=1;i<=n;++i)
{
int u,v;cin>>u>>v;
if(!union_(u,v))
{
A=u;B=v;
}
else
{
graph[u].push_back(v);
graph[v].push_back(u);
}
}
memset(dp,-1,sizeof(dp));
int res=oo;
res=min({cal(A,0,0,0,0,-1),cal(A,0,0,0,1,-1),cal(A,1,0,1,0,-1),cal(A,1,0,1,1,-1)});
if(res<oo)cout<<res;
else cout<<-1;
}
/*
ଘ(੭ˊᵕˋ)੭* ੈ✩‧˚huynhyen1609<3
*/
Compilation message
Main.cpp:93:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
93 | main()
| ^~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
6 ms |
15180 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
15104 KB |
Output is correct |
| 2 |
Correct |
7 ms |
15188 KB |
Output is correct |
| 3 |
Incorrect |
6 ms |
15188 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
15104 KB |
Output is correct |
| 2 |
Correct |
7 ms |
15188 KB |
Output is correct |
| 3 |
Incorrect |
6 ms |
15188 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
6 ms |
15180 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
