oj.uz

Submission #535562

# Submission time Handle Problem Language Result Execution time Memory
535562 2022-03-10T13:48:29 Z inksamurai Logičari (COCI21_logicari) C++17
110 / 110
 172 ms 19124 KB 
#include <bits/stdc++.h>
#define int ll
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 inf=1e9+11;
const int nax=100000;
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){
					dp[v][1][1]+=dp[u][0][0];
					dp[v][0][1]+=dp[u][0][1];
				}else{
					dp[v][1][1]+=dp[u][1][0];
					dp[v][0][1]+=dp[u][1][1];
				}
			}
		}else{
			dp[v][0][1]=0;
			for(auto u:adj[v]){
				if(u==par) continue;
				if(u!=ru){
					dp[v][0][1]+=dp[u][0][1];
				}else{
					dp[v][0][1]+=dp[u][1][0];
				}
			}
		}
	}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 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 2 ms 2644 KB Output is correct
5 Correct 129 ms 19000 KB Output is correct
6 Correct 146 ms 19088 KB Output is correct
7 Correct 145 ms 19124 KB Output is correct
8 Correct 140 ms 19020 KB Output is correct

Subtask #2
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 1 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 1 ms 2644 KB Output is correct
6 Correct 2 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 2 ms 2644 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 1 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 2 ms 2644 KB Output is correct
2 Correct 2 ms 2644 KB Output is correct
3 Correct 1 ms 2644 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 1 ms 2644 KB Output is correct
6 Correct 2 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 2 ms 2644 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 1 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 2 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 2 ms 2644 KB Output is correct
18 Correct 2 ms 2644 KB Output is correct
19 Correct 1 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 2 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 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 2 ms 2644 KB Output is correct
5 Correct 129 ms 19000 KB Output is correct
6 Correct 146 ms 19088 KB Output is correct
7 Correct 145 ms 19124 KB Output is correct
8 Correct 140 ms 19020 KB Output is correct
9 Correct 2 ms 2644 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 1 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 1 ms 2644 KB Output is correct
14 Correct 2 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 2 ms 2644 KB Output is correct
18 Correct 2 ms 2644 KB Output is correct
19 Correct 1 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 2 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 2 ms 2644 KB Output is correct
26 Correct 2 ms 2644 KB Output is correct
27 Correct 1 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 2 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 80 ms 9280 KB Output is correct
34 Correct 70 ms 9376 KB Output is correct
35 Correct 86 ms 9388 KB Output is correct
36 Correct 82 ms 9404 KB Output is correct
37 Correct 13 ms 4376 KB Output is correct
38 Correct 76 ms 9412 KB Output is correct
39 Correct 4 ms 3156 KB Output is correct
40 Correct 61 ms 9288 KB Output is correct
41 Correct 53 ms 10440 KB Output is correct
42 Correct 56 ms 10424 KB Output is correct
43 Correct 172 ms 19084 KB Output is correct
44 Correct 107 ms 14700 KB Output is correct