Submission #441143

#	Time	Username	Problem	Language	Result	Execution time	Memory
441143		hhhhaura	Amusement Park (CEOI19_amusementpark)	C++14	100 / 100	2703 ms	6596 KiB

amusementpark

#define wiwihorz
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma loop-opt(on)

#define rep(i, a, b) for(int i = a; i <= b; i++)
#define rrep(i, a, b) for(int i = b; i >= a; i--)
#define all(x) x.begin(), x.end()
#define ceil(a, b) ((a + b - 1) / (b))

#define INF 1000000000000000000
#define MOD 998244353
#define eps (1e-9)

using namespace std;

#define int long long int
#define lld long double
#define pii pair<int, int>
#define random mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count())

#ifdef wiwihorz
#define print(a...) kout("[" + string(#a) + "] = ", a)
void vprint(auto L, auto R) {while(L < R) cerr << *L << " \n"[next(L) == R], ++L;}
void kout() { cerr << endl; }
template<class T1, class ... T2> void kout(T1 a, T2 ... e) { cerr << a << " ", kout(e...); }
#else
#define print(...) 0
#define vprint(...) 0
#endif
namespace solver {
	int n, m, inv2 = 499122177;
	vector<int> dp, ok, cnt;
	vector<pii> es;
	void init_(int _n, int _m) {
		n = _n, m = _m;
		es.clear();
		dp.assign(1 << n, 0);
		ok.assign(1 << n, 0);
		cnt.assign(1 << n, 0);
	}
	int solve() {
		rep(i, 1, (1 << n) - 1) {
			bool yes = 0;
			for(auto j : es) {
				yes |= (((i >> (j.first - 1)) & 1) 
					&& ((i >> (j.second - 1)) & 1));
			}
			cnt[i] = __builtin_popcount(i);
			ok[i] = !yes; 
		}
		dp[0] = 1;
		rep(i, 1, (1 << n) - 1) {
			for(int j = i; j > 0; j = (j - 1) & i) {
				if(!ok[j]) continue;
				dp[i] = (dp[i] + ((cnt[j] & 1) ? 1 : -1) * dp[i ^ j]) % MOD;
			}
		}
		int ans = m * inv2 % MOD * dp[(1 << n) - 1] % MOD;
		return (ans + MOD) % MOD;
	}
};
using namespace solver;
signed main() {
	ios::sync_with_stdio(false), cin.tie(0);
	int n, m; cin >> n >> m;
	init_(n, m);
	rep(i, 1, m) {
		int a, b; cin >> a >> b;
		es.push_back({a, b});
	}
	cout << solve() << "\n";
	return 0;
}

Compilation message (stderr)

amusementpark.cpp:4: warning: ignoring '#pragma loop ' [-Wunknown-pragmas]
    4 | #pragma loop-opt(on)
      | 
amusementpark.cpp:24:13: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   24 | void vprint(auto L, auto R) {while(L < R) cerr << *L << " \n"[next(L) == R], ++L;}
      |             ^~~~
amusementpark.cpp:24:21: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   24 | void vprint(auto L, auto R) {while(L < R) cerr << *L << " \n"[next(L) == R], ++L;}
      |                     ^~~~

• Subtask 1: 7 / 7
• Subtask 2: 12 / 12
• Subtask 3: 23 / 23
• Subtask 4: 21 / 21
• Subtask 5: 37 / 37