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Submission #535568

# Submission time Handle Problem Language Result Execution time Memory
535568 2022-03-10T13:55:46 Z inksamurai Logičari (COCI21_logicari) C++17
110 / 110
 150 ms 17228 KB 
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define rng(i,x,n) for(int i=x;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define vec(...) vector<__VA_ARGS__>
#define _3HspL4A ios::sync_with_stdio(0),cin.tie(0)
typedef long long ll;
using pii=pair<int,int>;
using vi=vec(int);
void print(){cout<<"\n";}
template<class T,class...E>
void print(const T&v,const E&...u){cout<<v<<' ',print(u...);}
// e 
 
const int nax=100000;
const int inf=nax;
int n,root,ru,usd[nax+11];
vi adj[nax+11];
 
void get_root(int v,int par){
	if(root!=-1) return;
	usd[v]=1;
	for(auto u:adj[v]){
		if(u==par) continue;
		if(usd[u]){
			root=v;
			ru=u;
			return;
		}
		get_root(u,v);
	}
}
 
int xru,yru,dp[nax+11][2][2];
 
void affine(int v,int par){
	rep(t,2)rep(t1,2) dp[v][t][t1]=inf;
	if(xru){
		if(yru) dp[v][1][1]=1;
		dp[v][0][1]=0;
		for(auto u:adj[v]){
			if(u==par) continue;
			if(u!=ru){
				if(yru) dp[v][1][1]+=dp[u][0][0];
				dp[v][0][1]+=dp[u][0][1];
			}else{
				if(yru) dp[v][1][1]+=dp[u][1][0];
				dp[v][0][1]+=dp[u][1][yru];
			}
		}
	}else{
		dp[v][0][0]=0;
		if(yru) dp[v][1][0]=1;
		for(auto u:adj[v]){
			if(u==par) continue;
			if(u!=ru){
				dp[v][0][0]+=dp[u][0][1];
				if(yru) dp[v][1][0]+=dp[u][0][0];
			}else{
				dp[v][0][0]+=dp[u][0][yru];
				if(yru) dp[v][1][0]+=dp[u][0][0];
			}
		}
		for(auto u:adj[v]){
			if(u==par or u==ru) continue;
			dp[v][0][1]=min(dp[v][0][1],dp[v][0][0]-dp[u][0][1]+dp[u][1][1]);
			if(yru) dp[v][1][1]=min(dp[v][1][1],dp[v][1][0]-dp[u][0][0]+dp[u][1][0]);
		}
	}
}
 
void quq(int v,int par){
	dp[v][0][0]=0;
	dp[v][1][0]=1;
	bool pok=0;
	for(auto u:adj[v]){
		if(u==par) continue;
		pok=pok or (u==ru);
		quq(u,v);
		dp[v][0][0]+=dp[u][0][1];
		dp[v][1][0]+=dp[u][0][0];
	}
	dp[v][0][1]=dp[v][1][1]=inf;
	for(auto u:adj[v]){
		if(u==par) continue;
		dp[v][0][1]=min(dp[v][0][1],dp[v][0][0]-dp[u][0][1]+dp[u][1][1]);
		dp[v][1][1]=min(dp[v][1][1],dp[v][1][0]-dp[u][0][0]+dp[u][1][0]);
	}
	if(pok){
		affine(v,par);
	}
}
 
signed main(){
_3HspL4A;
	cin>>n;
	rep(i,n){
		int u,v;
		cin>>u>>v;
		u-=1,v-=1;
		adj[u].pb(v);
		adj[v].pb(u);
	}
	root=-1;
	get_root(0,-1);
	{
		rep(i,sz(adj[root])){
			if(adj[root][i]==ru){
				adj[root].erase(adj[root].begin()+i);
				break;
			}
		}
		rep(i,sz(adj[ru])){
			if(adj[ru][i]==root){
				adj[ru].erase(adj[ru].begin()+i);
				break;
			}
		}
	}
	int ans=inf;
	rep(t,2){
		rep(t1,2){
			yru=!t,xru=!t1;
			rep(i,n){
				dp[i][0][0]=dp[i][0][1]=dp[i][1][0]=dp[i][1][1]=inf;
			}
			quq(root,-1);
			ans=min(ans,dp[root][t][t1]);
		}
	}
	print(ans>=inf?-1:ans);
//	
	return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 106 ms 17100 KB Output is correct
6 Correct 118 ms 17132 KB Output is correct
7 Correct 150 ms 17228 KB Output is correct
8 Correct 150 ms 17188 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 1 ms 2644 KB Output is correct
5 Correct 1 ms 2644 KB Output is correct
6 Correct 1 ms 2644 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 1 ms 2644 KB Output is correct
9 Correct 1 ms 2644 KB Output is correct
10 Correct 1 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 1 ms 2644 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 1 ms 2644 KB Output is correct
5 Correct 1 ms 2644 KB Output is correct
6 Correct 1 ms 2644 KB Output is correct
7 Correct 2 ms 2644 KB Output is correct
8 Correct 1 ms 2644 KB Output is correct
9 Correct 1 ms 2644 KB Output is correct
10 Correct 1 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 2 ms 2644 KB Output is correct
14 Correct 3 ms 2644 KB Output is correct
15 Correct 2 ms 2644 KB Output is correct
16 Correct 2 ms 2644 KB Output is correct
17 Correct 1 ms 2644 KB Output is correct
18 Correct 2 ms 2644 KB Output is correct
19 Correct 2 ms 2644 KB Output is correct
20 Correct 2 ms 2644 KB Output is correct
21 Correct 2 ms 2644 KB Output is correct
22 Correct 1 ms 2644 KB Output is correct
23 Correct 2 ms 2772 KB Output is correct
24 Correct 2 ms 2772 KB Output is correct

Subtask #4
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 2 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 106 ms 17100 KB Output is correct
6 Correct 118 ms 17132 KB Output is correct
7 Correct 150 ms 17228 KB Output is correct
8 Correct 150 ms 17188 KB Output is correct
9 Correct 1 ms 2644 KB Output is correct
10 Correct 1 ms 2644 KB Output is correct
11 Correct 1 ms 2644 KB Output is correct
12 Correct 1 ms 2644 KB Output is correct
13 Correct 1 ms 2644 KB Output is correct
14 Correct 1 ms 2644 KB Output is correct
15 Correct 2 ms 2644 KB Output is correct
16 Correct 1 ms 2644 KB Output is correct
17 Correct 1 ms 2644 KB Output is correct
18 Correct 1 ms 2644 KB Output is correct
19 Correct 2 ms 2644 KB Output is correct
20 Correct 2 ms 2644 KB Output is correct
21 Correct 2 ms 2644 KB Output is correct
22 Correct 3 ms 2644 KB Output is correct
23 Correct 2 ms 2644 KB Output is correct
24 Correct 2 ms 2644 KB Output is correct
25 Correct 1 ms 2644 KB Output is correct
26 Correct 2 ms 2644 KB Output is correct
27 Correct 2 ms 2644 KB Output is correct
28 Correct 2 ms 2644 KB Output is correct
29 Correct 2 ms 2644 KB Output is correct
30 Correct 1 ms 2644 KB Output is correct
31 Correct 2 ms 2772 KB Output is correct
32 Correct 2 ms 2772 KB Output is correct
33 Correct 64 ms 7248 KB Output is correct
34 Correct 79 ms 7196 KB Output is correct
35 Correct 71 ms 7244 KB Output is correct
36 Correct 55 ms 7156 KB Output is correct
37 Correct 11 ms 3840 KB Output is correct
38 Correct 56 ms 7308 KB Output is correct
39 Correct 5 ms 3028 KB Output is correct
40 Correct 54 ms 7116 KB Output is correct
41 Correct 53 ms 8104 KB Output is correct
42 Correct 47 ms 8100 KB Output is correct
43 Correct 120 ms 17080 KB Output is correct
44 Correct 71 ms 12616 KB Output is correct