Submission #540886

#	Time	Username	Problem	Language	Result	Execution time	Memory
540886		skittles1412	Alternating Current (BOI18_alternating)	C++17	13 / 100	3061 ms	2236 KiB

alternating

#include "bits/extc++.h"

using namespace std;

template <typename T>
void dbgh(const T& t) {
	cerr << t << endl;
}

template <typename T, typename... U>
void dbgh(const T& t, const U&... u) {
	cerr << t << " | ";
	dbgh(u...);
}

#ifdef DEBUG
#define dbg(...)                                           \
	cerr << "L" << __LINE__ << " [" << #__VA_ARGS__ << "]" \
		 << ": ";                                          \
	dbgh(__VA_ARGS__)
#else
#define cerr   \
	if (false) \
	cerr
#define dbg(...)
#endif

#define endl "\n"
#define long int64_t
#define sz(x) int((x).size())

void solve() {
	int n, m;
	cin >> n >> m;
	int arr[m][2];
	for (auto& [l, r] : arr) {
		cin >> l >> r;
		l--;
		r--;
	}
	for (int i = 0; i < (1 << m); i++) {
		int vis[n] {};
		for (int j = 0; j < m; j++) {
			int msk = 1 << ((i >> j) & 1);
			auto [l, r] = arr[j];
			if (l <= r) {
				for (int k = l; k <= r; k++) {
					vis[k] |= msk;
				}
			} else {
				for (int k = l; k < n; k++) {
					vis[k] |= msk;
				}
				for (int k = 0; k <= r; k++) {
					vis[k] |= msk;
				}
			}
		}
		for (auto& a : vis) {
			if (a != 3) {
				goto loop;
			}
		}
		for (int j = 0; j < m; j++) {
			cout << ((i >> j) & 1);
		}
		cout << endl;
		return;
	loop:;
	}
	cout << "impossible" << endl;
}

int main() {
	cin.tie(nullptr);
	ios_base::sync_with_stdio(false);
	cin.exceptions(ios::failbit);
	solve();
}

• Subtask 1: 13 / 13
• Subtask 2: 0 / 20
• Subtask 3: 0 / 22
• Subtask 4: 0 / 19
• Subtask 5: 0 / 26