Submission #473473

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
473473	2021-09-15T14:54:09 Z	Hamed5001	Alternating Current (BOI18_alternating)	C++14	13 / 100	3000 ms	2124 KB

alternating

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

int N, M;
vector<pair<int, int>> wires;

bool can(int msk) {
	vector<vector<bool>> cov(2, vector<bool>(N, 0));
	for (int i = M-1, j = 0; i >= 0; i--, j++) {
		bool which = msk & (1 << i);
		for (int k = wires[j].first; k != wires[j].second; (k+=1)%=N) {
			cov[which][k] = 1;
		}
		cov[which][wires[j].second] = 1;
	}
	for (int i = 0; i < N; i++) {
		for (int j = 0; j < 2; j++) {
			if (!cov[j][i]) return false;
		}
	}

	return true;
}

void solve() {
	cin >> N >> M;
	for (int i = 0; i < M; i++) {
		int a, b;
		cin >> a >> b;
		wires.push_back({--a, --b});
	}
	for (int msk = 0; msk < (1 << M); msk++) {
		if (can(msk)) {
			for (int i = M-1; i >= 0; i--) {
				cout << (1 & (msk >> i));
			}
			return;
		}
	}

	cout << "impossible";
}

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

Subtask #1
13.0 / 13.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	204 KB	Output is correct
2	Correct	1 ms	312 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Correct	0 ms	204 KB	Output is correct
5	Correct	1 ms	204 KB	Output is correct
6	Correct	1 ms	208 KB	Output is correct
7	Correct	1 ms	204 KB	Output is correct
8	Correct	1 ms	204 KB	Output is correct
9	Correct	1 ms	204 KB	Output is correct
10	Correct	1 ms	204 KB	Output is correct
11	Correct	1 ms	204 KB	Output is correct
12	Correct	1 ms	204 KB	Output is correct
13	Correct	2 ms	204 KB	Output is correct
14	Correct	1 ms	204 KB	Output is correct
15	Correct	0 ms	204 KB	Output is correct
16	Correct	0 ms	204 KB	Output is correct
17	Correct	1 ms	204 KB	Output is correct
18	Correct	0 ms	204 KB	Output is correct
19	Correct	1 ms	204 KB	Output is correct
20	Correct	1 ms	204 KB	Output is correct
21	Correct	1 ms	204 KB	Output is correct
22	Correct	4 ms	204 KB	Output is correct
23	Correct	1 ms	204 KB	Output is correct
24	Correct	1 ms	204 KB	Output is correct
25	Correct	1 ms	204 KB	Output is correct
26	Correct	1 ms	308 KB	Output is correct
27	Correct	2 ms	204 KB	Output is correct
28	Correct	0 ms	204 KB	Output is correct
29	Correct	1 ms	212 KB	Output is correct
30	Correct	0 ms	312 KB	Output is correct
31	Correct	1 ms	208 KB	Output is correct
32	Correct	1 ms	208 KB	Output is correct
33	Correct	1 ms	208 KB	Output is correct
34	Correct	1 ms	316 KB	Output is correct
35	Correct	18 ms	324 KB	Output is correct
36	Correct	1 ms	204 KB	Output is correct
37	Correct	1 ms	208 KB	Output is correct
38	Correct	16 ms	316 KB	Output is correct
39	Correct	1 ms	208 KB	Output is correct
40	Correct	1 ms	212 KB	Output is correct

Subtask #2
0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	204 KB	Output is correct
2	Correct	1 ms	312 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Correct	0 ms	204 KB	Output is correct
5	Correct	1 ms	204 KB	Output is correct
6	Correct	1 ms	208 KB	Output is correct
7	Correct	1 ms	204 KB	Output is correct
8	Correct	1 ms	204 KB	Output is correct
9	Correct	1 ms	204 KB	Output is correct
10	Correct	1 ms	204 KB	Output is correct
11	Correct	1 ms	204 KB	Output is correct
12	Correct	1 ms	204 KB	Output is correct
13	Correct	2 ms	204 KB	Output is correct
14	Correct	1 ms	204 KB	Output is correct
15	Correct	0 ms	204 KB	Output is correct
16	Correct	0 ms	204 KB	Output is correct
17	Correct	1 ms	204 KB	Output is correct
18	Correct	0 ms	204 KB	Output is correct
19	Correct	1 ms	204 KB	Output is correct
20	Correct	1 ms	204 KB	Output is correct
21	Correct	1 ms	204 KB	Output is correct
22	Correct	4 ms	204 KB	Output is correct
23	Correct	1 ms	204 KB	Output is correct
24	Correct	1 ms	204 KB	Output is correct
25	Correct	1 ms	204 KB	Output is correct
26	Correct	1 ms	308 KB	Output is correct
27	Correct	2 ms	204 KB	Output is correct
28	Correct	0 ms	204 KB	Output is correct
29	Correct	1 ms	212 KB	Output is correct
30	Correct	0 ms	312 KB	Output is correct
31	Correct	1 ms	208 KB	Output is correct
32	Correct	1 ms	208 KB	Output is correct
33	Correct	1 ms	208 KB	Output is correct
34	Correct	1 ms	316 KB	Output is correct
35	Correct	18 ms	324 KB	Output is correct
36	Correct	1 ms	204 KB	Output is correct
37	Correct	1 ms	208 KB	Output is correct
38	Correct	16 ms	316 KB	Output is correct
39	Correct	1 ms	208 KB	Output is correct
40	Correct	1 ms	212 KB	Output is correct
41	Correct	1 ms	204 KB	Output is correct
42	Correct	2 ms	204 KB	Output is correct
43	Incorrect	0 ms	204 KB	'impossible' claimed, but there is a solution
44	Halted	0 ms	0 KB	-

Subtask #3
0 / 22.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	204 KB	Output is correct
2	Correct	1 ms	312 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Correct	0 ms	204 KB	Output is correct
5	Correct	1 ms	204 KB	Output is correct
6	Correct	1 ms	208 KB	Output is correct
7	Correct	1 ms	204 KB	Output is correct
8	Correct	1 ms	204 KB	Output is correct
9	Correct	1 ms	204 KB	Output is correct
10	Correct	1 ms	204 KB	Output is correct
11	Correct	1 ms	204 KB	Output is correct
12	Correct	1 ms	204 KB	Output is correct
13	Correct	2 ms	204 KB	Output is correct
14	Correct	1 ms	204 KB	Output is correct
15	Correct	0 ms	204 KB	Output is correct
16	Correct	0 ms	204 KB	Output is correct
17	Correct	1 ms	204 KB	Output is correct
18	Correct	0 ms	204 KB	Output is correct
19	Correct	1 ms	204 KB	Output is correct
20	Correct	1 ms	204 KB	Output is correct
21	Correct	1 ms	204 KB	Output is correct
22	Correct	4 ms	204 KB	Output is correct
23	Correct	1 ms	204 KB	Output is correct
24	Correct	1 ms	204 KB	Output is correct
25	Correct	1 ms	204 KB	Output is correct
26	Correct	1 ms	308 KB	Output is correct
27	Correct	2 ms	204 KB	Output is correct
28	Correct	0 ms	204 KB	Output is correct
29	Correct	1 ms	212 KB	Output is correct
30	Correct	0 ms	312 KB	Output is correct
31	Correct	1 ms	208 KB	Output is correct
32	Correct	1 ms	208 KB	Output is correct
33	Correct	1 ms	208 KB	Output is correct
34	Correct	1 ms	316 KB	Output is correct
35	Correct	18 ms	324 KB	Output is correct
36	Correct	1 ms	204 KB	Output is correct
37	Correct	1 ms	208 KB	Output is correct
38	Correct	16 ms	316 KB	Output is correct
39	Correct	1 ms	208 KB	Output is correct
40	Correct	1 ms	212 KB	Output is correct
41	Correct	1 ms	204 KB	Output is correct
42	Correct	2 ms	204 KB	Output is correct
43	Incorrect	0 ms	204 KB	'impossible' claimed, but there is a solution
44	Halted	0 ms	0 KB	-

Subtask #4
0 / 19.0

#	Verdict	Execution time	Memory	Grader output
1	Execution timed out	3030 ms	2124 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

Subtask #5
0 / 26.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	204 KB	Output is correct
2	Correct	1 ms	312 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Correct	0 ms	204 KB	Output is correct
5	Correct	1 ms	204 KB	Output is correct
6	Correct	1 ms	208 KB	Output is correct
7	Correct	1 ms	204 KB	Output is correct
8	Correct	1 ms	204 KB	Output is correct
9	Correct	1 ms	204 KB	Output is correct
10	Correct	1 ms	204 KB	Output is correct
11	Correct	1 ms	204 KB	Output is correct
12	Correct	1 ms	204 KB	Output is correct
13	Correct	2 ms	204 KB	Output is correct
14	Correct	1 ms	204 KB	Output is correct
15	Correct	0 ms	204 KB	Output is correct
16	Correct	0 ms	204 KB	Output is correct
17	Correct	1 ms	204 KB	Output is correct
18	Correct	0 ms	204 KB	Output is correct
19	Correct	1 ms	204 KB	Output is correct
20	Correct	1 ms	204 KB	Output is correct
21	Correct	1 ms	204 KB	Output is correct
22	Correct	4 ms	204 KB	Output is correct
23	Correct	1 ms	204 KB	Output is correct
24	Correct	1 ms	204 KB	Output is correct
25	Correct	1 ms	204 KB	Output is correct
26	Correct	1 ms	308 KB	Output is correct
27	Correct	2 ms	204 KB	Output is correct
28	Correct	0 ms	204 KB	Output is correct
29	Correct	1 ms	212 KB	Output is correct
30	Correct	0 ms	312 KB	Output is correct
31	Correct	1 ms	208 KB	Output is correct
32	Correct	1 ms	208 KB	Output is correct
33	Correct	1 ms	208 KB	Output is correct
34	Correct	1 ms	316 KB	Output is correct
35	Correct	18 ms	324 KB	Output is correct
36	Correct	1 ms	204 KB	Output is correct
37	Correct	1 ms	208 KB	Output is correct
38	Correct	16 ms	316 KB	Output is correct
39	Correct	1 ms	208 KB	Output is correct
40	Correct	1 ms	212 KB	Output is correct
41	Correct	1 ms	204 KB	Output is correct
42	Correct	2 ms	204 KB	Output is correct
43	Incorrect	0 ms	204 KB	'impossible' claimed, but there is a solution
44	Halted	0 ms	0 KB	-

Submission #473473

Compilation message

Subtask #1 13.0 / 13.0

Subtask #2 0 / 20.0

Subtask #3 0 / 22.0

Subtask #4 0 / 19.0

Subtask #5 0 / 26.0

Subtask #1
13.0 / 13.0

Subtask #2
0 / 20.0

Subtask #3
0 / 22.0

Subtask #4
0 / 19.0

Subtask #5
0 / 26.0