///////////////////////////////////////////////////////////////////////////////////////////////
#include <bits/stdc++.h>
using namespace std;
// #define int long long
#define FAST_IO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define FILE_IO(x) freopen((string(x) + ".in").c_str(), "r", stdin); freopen((string(x) + ".out").c_str(), "w", stdout)
#define f first
#define s second
#define x1 x1qwer
#define y1 y1qwer
#define right right123
#define left left123
#define foreach(it, v) for (auto it : v)
#define rep(it, n) for (int it = 0; it < n; ++it)
#define forin(it, l, r) for (int it = l; it < r; ++it)
#define all(x) x.begin(), x.end()
typedef long long ll;
typedef unsigned long long ull;
typedef double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const double DINF = numeric_limits<double>::infinity();
const ll MOD = 1e9 + 7;
const double EPS = 1e-7;
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
mt19937 mmtw_(MOD);
uniform_int_distribution<ll> rd_;
ll randomll() { return rd_(mmtw_);}
ll rnd(ll x, ll y) { return rd_(mmtw_) % (y - x + 1) + x; }
template <class T> T fact(T n) { if (n == 1) return 1; return n * fact(n - 1); }
////////////////////////////////////////////////////////////////////////////////////////////////
const int MAXN = 25;
int n, m;
vector<pii> e;
int main() {
FAST_IO;
cin >> n >> m;
rep(i, m) {
int a, b;
cin >> a >> b;
e.push_back({a - 1, b - 1});
}
ll res = 0;
for (int mask = 0; mask < (1 << n); ++mask) {
bool flag = false;
for (auto it : e) {
if ((mask & (1 << it.f)) && (mask & (1 << it.s))) {
flag = true;
break;
}
}
if (!flag) {
res++;
}
}
cout << res << endl;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
376 KB |
Output is correct |
2 |
Correct |
2 ms |
376 KB |
Output is correct |
3 |
Correct |
15 ms |
472 KB |
Output is correct |
4 |
Correct |
18 ms |
492 KB |
Output is correct |
5 |
Correct |
17 ms |
712 KB |
Output is correct |
6 |
Correct |
15 ms |
732 KB |
Output is correct |
7 |
Correct |
17 ms |
732 KB |
Output is correct |
8 |
Correct |
20 ms |
732 KB |
Output is correct |
9 |
Correct |
23 ms |
768 KB |
Output is correct |
10 |
Correct |
11 ms |
788 KB |
Output is correct |