Submission #532705

#	Time	Username	Problem	Language	Result	Execution time	Memory
532705		fatemetmhr	Alternating Current (BOI18_alternating)	C++17	13 / 100	12 ms	712 KiB

alternating

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

#define pb push_back

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());


const int maxn5 = 5e3 + 10;

int a[maxn5], b[maxn5];
bool av[2][maxn5];


int main(){
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);

	int n, m; cin >> n >> m;
	for(int i = 0; i < m; i++){
		cin >> a[i] >> b[i];
		a[i]--;
		b[i]--;
	}

	for(int mask = 1; mask < (1 << m) - 1; mask++){
		memset(av, false, sizeof av);
		for(int i = 0; i < m; i++){
			int x = a[i];
			while(true){
				av[(mask >> i)&1][x] = true;
				if(x == b[i])
					break;
				x++;
				if(x == n)
					x = 0;
			}
		}
		bool re = true;
		for(int i = 0; i < n; i++)
			if(!av[0][i] || !av[1][i])
				re = false;
		if(re){
			for(int i = 0; i < m; i++)
				cout << ((mask >> i)&1);
			return cout << endl, 0;
		}
	}
	cout << "impossible" << endl;

}

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