oj.uz

Submission #525949

# Submission time Handle Problem Language Result Execution time Memory
525949 2022-02-13T09:35:55 Z Slavita Logičari (COCI21_logicari) C++14
20 / 110
 315 ms 6852 KB 
#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
#define ve vector<int>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define pi pair<int,int>
#define all(v) v.begin(),v.end()
#define si(v) (int)v.size()
#define en '\n'
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define ordered_muiltiset tree<int, null_type,less_equal<>, rb_tree_tag,tree_order_statistics_node_update>
using namespace std;
//using namespace __gnu_pbds;
typedef long long ll;
typedef unsigned long long ull;

const int N = 1e5 + 228;
const int big = 1e9;
const ll llbig = 1e18 + 228;
//ordered_set os; // os.order_of_key(4), (*os.find_by_order(5))
int n, m;
int mrk[N];
vector<int> g[N];

bool getbit(int x, int bit){
    assert(bit > 0);
    bit--;
    return (x & (1 << bit)) == (1 << bit);
}

int main(){
    cin >> n;
    for (int i = 1; i <= n; i++){
        int a, b; cin >> a >> b;
        g[a].pb(b);
        g[b].pb(a);
    }

    if (n <= 21){
        int ans = big;
        for (int mask = 1; mask <= (1 << (n + 1)); mask++){
            bool ok = 1; int an = 0;
            for (int i = 1; i <= n; i++) mrk[i] = 0;
            for (int i = 1; i <= n; i++){
                if (!getbit(mask, i)) continue;
                an++;
                mrk[i] = 2;
                for (auto u : g[i]){
                    if (getbit(mask, u)) continue;
                    if (mrk[u]) {ok = 0; break;}
                    mrk[u] = 1;
                }
            }
            for (int i = 1; i <= n; i++) {
                int kol = 0;
                for (auto u : g[i]){
                    if (getbit(mask, u)) kol++;
                }
                if (kol != 1) {ok = 0; break;}
            }
            if (ok){
                ans = min(ans, an);
            }
        }
        if (ans == big) cout << -1; else cout << ans;
    }else{
        if (n % 4 == 0){
            cout << n / 2;
        } else cout << -1;
    }

    return 0;
}
/*
*/

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 1 ms 2636 KB Output is correct
3 Correct 1 ms 2636 KB Output is correct
4 Correct 1 ms 2636 KB Output is correct
5 Correct 96 ms 5700 KB Output is correct
6 Correct 66 ms 6796 KB Output is correct
7 Correct 65 ms 6852 KB Output is correct
8 Correct 67 ms 6852 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 315 ms 2636 KB Output is correct
2 Correct 305 ms 2636 KB Output is correct
3 Correct 266 ms 2636 KB Output is correct
4 Correct 281 ms 2636 KB Output is correct
5 Correct 2 ms 2636 KB Output is correct
6 Correct 134 ms 2636 KB Output is correct
7 Correct 2 ms 2636 KB Output is correct
8 Correct 66 ms 2636 KB Output is correct
9 Correct 231 ms 2636 KB Output is correct
10 Correct 223 ms 2636 KB Output is correct
11 Correct 34 ms 2636 KB Output is correct
12 Correct 254 ms 2636 KB Output is correct

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 315 ms 2636 KB Output is correct
2 Correct 305 ms 2636 KB Output is correct
3 Correct 266 ms 2636 KB Output is correct
4 Correct 281 ms 2636 KB Output is correct
5 Correct 2 ms 2636 KB Output is correct
6 Correct 134 ms 2636 KB Output is correct
7 Correct 2 ms 2636 KB Output is correct
8 Correct 66 ms 2636 KB Output is correct
9 Correct 231 ms 2636 KB Output is correct
10 Correct 223 ms 2636 KB Output is correct
11 Correct 34 ms 2636 KB Output is correct
12 Correct 254 ms 2636 KB Output is correct
13 Incorrect 2 ms 2636 KB Output isn't correct
14 Halted 0 ms 0 KB -

Subtask #4
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2636 KB Output is correct
2 Correct 1 ms 2636 KB Output is correct
3 Correct 1 ms 2636 KB Output is correct
4 Correct 1 ms 2636 KB Output is correct
5 Correct 96 ms 5700 KB Output is correct
6 Correct 66 ms 6796 KB Output is correct
7 Correct 65 ms 6852 KB Output is correct
8 Correct 67 ms 6852 KB Output is correct
9 Correct 315 ms 2636 KB Output is correct
10 Correct 305 ms 2636 KB Output is correct
11 Correct 266 ms 2636 KB Output is correct
12 Correct 281 ms 2636 KB Output is correct
13 Correct 2 ms 2636 KB Output is correct
14 Correct 134 ms 2636 KB Output is correct
15 Correct 2 ms 2636 KB Output is correct
16 Correct 66 ms 2636 KB Output is correct
17 Correct 231 ms 2636 KB Output is correct
18 Correct 223 ms 2636 KB Output is correct
19 Correct 34 ms 2636 KB Output is correct
20 Correct 254 ms 2636 KB Output is correct
21 Incorrect 2 ms 2636 KB Output isn't correct
22 Halted 0 ms 0 KB -