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Submission #861754

# Submission time Handle Problem Language Result Execution time Memory
861754 2023-10-17T01:07:01 Z Ahmed_Solyman Logičari (COCI21_logicari) C++14
20 / 110
 167 ms 7428 KB 
/*
In the name of Allah
made by: Ahmed_Solyman
*/
#include <bits/stdc++.h>
#include <ext/rope>
 
using namespace std;
using namespace __gnu_cxx;
#pragma GCC optimize("-Ofast")
#pragma GCC optimize("-O1")
//-------------------------------------------------------------//
typedef long long ll;
typedef unsigned long long ull;
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define PI acos(-1)
#define lb lower_bound
#define ub upper_bound
#define endl '\n'
#define all(v) v.begin(),v.end()
#define allr(v) v.rbegin(),v.rend()
#define sum_to(n) (n*(n+1))/2
#define pb push_back
#define pf push_front
#define fil(arr,x) memset(arr,x,sizeof(arr))
const ll mod=1e9+7;
int dx[8]={0,1,0,-1,1,1,-1,-1};
int dy[8]={1,0,-1,0,1,-1,-1,1};
//-------------------------------------------------------------//
ll lcm(ll a,ll b)
{
    return (max(a,b)/__gcd(a,b))*min(a,b);
}
void person_bool(bool x)
{
    cout<<(x?"YES":"NO")<<endl;
}
int main()
{
    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);
    #ifndef ONLINE_JUDGE
    //freopen("input.in", "r", stdin);
    //freopen("output.out", "w", stdout);
    #endif
    fast
    int n;cin>>n;
    vector<int>adj[n];
    int deg[n];
    for(int i=0;i<n;i++){
    	int u,v;cin>>u>>v;u--;v--;
    	deg[u]++;deg[v]++;
    	adj[u].push_back(v);
    	adj[v].push_back(u);
    }
    bool ok=1;
    for(int i=0;i<n;i++)ok&=(deg[i]==2);
    if(ok){
    	if(n%4)cout<<-1<<endl;
    	else cout<<n/2<<endl;
    	return 0;
    }
    int ans=-1;
    for(int i=1;i<(1<<n);i++){
    	vector<bool>v(n);
    	for(int j=0;j<n;j++){
    		if((1<<j)&i){
    			v[j]=1;
    		}
    	}
    	bool valid=1;
    	for(int j=0;j<n;j++){
    		int cnt=0;
    		for(auto ch:adj[j]){
    			if(v[ch])cnt++;
    		}
    		valid&=(cnt==1);
    	}
    	if(valid){
    		if(ans==-1){
    			ans=__builtin_popcount(i);
    		}
    		else{
    			ans=min(ans,__builtin_popcount(i));
    		}
    	}
    }
    cout<<ans<<endl;
    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 21 ms 6236 KB Output is correct
6 Correct 22 ms 7260 KB Output is correct
7 Correct 22 ms 7428 KB Output is correct
8 Correct 26 ms 7260 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 141 ms 428 KB Output is correct
2 Correct 140 ms 428 KB Output is correct
3 Correct 138 ms 344 KB Output is correct
4 Correct 158 ms 344 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 72 ms 348 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 33 ms 348 KB Output is correct
9 Correct 167 ms 348 KB Output is correct
10 Correct 141 ms 348 KB Output is correct
11 Correct 17 ms 348 KB Output is correct
12 Correct 147 ms 432 KB Output is correct

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 141 ms 428 KB Output is correct
2 Correct 140 ms 428 KB Output is correct
3 Correct 138 ms 344 KB Output is correct
4 Correct 158 ms 344 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 72 ms 348 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 33 ms 348 KB Output is correct
9 Correct 167 ms 348 KB Output is correct
10 Correct 141 ms 348 KB Output is correct
11 Correct 17 ms 348 KB Output is correct
12 Correct 147 ms 432 KB Output is correct
13 Incorrect 0 ms 348 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #4
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 21 ms 6236 KB Output is correct
6 Correct 22 ms 7260 KB Output is correct
7 Correct 22 ms 7428 KB Output is correct
8 Correct 26 ms 7260 KB Output is correct
9 Correct 141 ms 428 KB Output is correct
10 Correct 140 ms 428 KB Output is correct
11 Correct 138 ms 344 KB Output is correct
12 Correct 158 ms 344 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 72 ms 348 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 33 ms 348 KB Output is correct
17 Correct 167 ms 348 KB Output is correct
18 Correct 141 ms 348 KB Output is correct
19 Correct 17 ms 348 KB Output is correct
20 Correct 147 ms 432 KB Output is correct
21 Incorrect 0 ms 348 KB Output isn't correct
22 Halted 0 ms 0 KB -