Submission #106144

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
106144	2019-04-16T19:15:18 Z	Noam527	Alternating Current (BOI18_alternating)	C++17	55 / 100	3000 ms	16116 KB

alternating

#include <bits/stdc++.h>
#define CHECK cout << "ok" << endl
#define finish(x) return cout << x << endl, 0
typedef long long ll;
typedef long double ldb;
const int md = 1e9 + 7;
const ll inf = 1e18;
const int OO = 0;
const int OOO = 1;
using namespace std;

struct edge {
	int to, i;
	edge(int tt = 0, int ii = 0) : to(tt), i(ii) {}
};

int n, m;
int C[100005] = {};
int dp[200005], to[200005];
int range[200005] = {};

vector<edge> g[200005];
vector<int> vis;
vector<int> path;

string ans;

void add(int l, int r) {
	C[l]++;
	C[r + 1]--;
}
void pre() {
	for (int i = 1; i <= n; i++) C[i] += C[i - 1];
	for (int i = 1; i <= n; i++) {
		if (C[i] == 1) {
			cout << "impossible\n";
			exit(0);
		}
		C[i] = max(0, min(1, C[i] - 2));
		if (C[i]) {
			if (OO) {
				cout << "from C adding " << i << " " << i - 1 << '\n';
			}
			g[i].push_back(edge(i - 1, -1));
			g[i + n].push_back(edge(i - 1 + n, -1));
		}
	}
}

bool dfs(int v, int tar) {
	if (OO) {
		cout << "dfsing " << v << " tar " << tar << '\n';
	}
	if (v == tar) return true;
	if (vis[v % n]) return false;
	vis[v % n] = 1;
	for (const auto &i : g[v]) {
		path.push_back(i.i);
		if (dfs(i.to, tar)) return true;
		path.pop_back();
	}
	return false;
}

bool check(int v) {
	if (OO) {
		cout << "starting check on " << v << '\n';
	}
	for (auto &i : vis) i = 0;
	if (dfs(v, v + n)) return true;
	return false;
}

int main() {
	ios::sync_with_stdio(0), cin.tie(0);
	cin >> n >> m;
	for (int i = 0, l, r; i < m; i++) {
		cin >> l >> r;
		if (l > r) {
			add(l, n);
			add(1, r);
			l--;
			r += n;
			if (OO) cout << "from input adding " << l << " " << r << '\n';
			g[l].push_back(edge(r, i));
			g[l + n].push_back(edge(2 * n, i));
		}
		else {
			add(l, r);
			l--;
			if (OO) cout << "from input adding " << l << " " << r << '\n';
			g[l].push_back(edge(r, i));
			g[l + n].push_back(edge(r + n, i));
		}
	}
	pre();

	ans.resize(m, '1');
	vis.resize(n, 0);

	for (int i = 0; i < n; i++) {
		if (check(i)) {
			for (const auto &j : path)
				if (j != -1) ans[j] = '0';
			finish(ans);
		}
	}
	finish("impossible");
}

Subtask #1
13.0 / 13.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	7 ms	5120 KB	Output is correct
2	Correct	1 ms	4992 KB	Output is correct
3	Correct	7 ms	5120 KB	Output is correct
4	Correct	6 ms	5120 KB	Output is correct
5	Correct	7 ms	4992 KB	Output is correct
6	Correct	6 ms	5120 KB	Output is correct
7	Correct	6 ms	4992 KB	Output is correct
8	Correct	6 ms	4992 KB	Output is correct
9	Correct	6 ms	5120 KB	Output is correct
10	Correct	8 ms	4992 KB	Output is correct
11	Correct	8 ms	5120 KB	Output is correct
12	Correct	6 ms	5120 KB	Output is correct
13	Correct	6 ms	4992 KB	Output is correct
14	Correct	8 ms	4992 KB	Output is correct
15	Correct	6 ms	5120 KB	Output is correct
16	Correct	6 ms	5120 KB	Output is correct
17	Correct	6 ms	4992 KB	Output is correct
18	Correct	8 ms	5120 KB	Output is correct
19	Correct	6 ms	4992 KB	Output is correct
20	Correct	7 ms	4992 KB	Output is correct
21	Correct	7 ms	4992 KB	Output is correct
22	Correct	7 ms	4992 KB	Output is correct
23	Correct	7 ms	5092 KB	Output is correct
24	Correct	6 ms	4992 KB	Output is correct
25	Correct	6 ms	5120 KB	Output is correct
26	Correct	7 ms	4992 KB	Output is correct
27	Correct	7 ms	5120 KB	Output is correct
28	Correct	7 ms	4992 KB	Output is correct
29	Correct	7 ms	4992 KB	Output is correct
30	Correct	7 ms	4992 KB	Output is correct
31	Correct	7 ms	5120 KB	Output is correct
32	Correct	7 ms	5120 KB	Output is correct
33	Correct	6 ms	4992 KB	Output is correct
34	Correct	7 ms	5120 KB	Output is correct
35	Correct	6 ms	5120 KB	Output is correct
36	Correct	6 ms	5120 KB	Output is correct
37	Correct	6 ms	4992 KB	Output is correct
38	Correct	6 ms	5120 KB	Output is correct
39	Correct	7 ms	4992 KB	Output is correct
40	Correct	7 ms	4992 KB	Output is correct

Subtask #2
20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	7 ms	5120 KB	Output is correct
2	Correct	1 ms	4992 KB	Output is correct
3	Correct	7 ms	5120 KB	Output is correct
4	Correct	6 ms	5120 KB	Output is correct
5	Correct	7 ms	4992 KB	Output is correct
6	Correct	6 ms	5120 KB	Output is correct
7	Correct	6 ms	4992 KB	Output is correct
8	Correct	6 ms	4992 KB	Output is correct
9	Correct	6 ms	5120 KB	Output is correct
10	Correct	8 ms	4992 KB	Output is correct
11	Correct	8 ms	5120 KB	Output is correct
12	Correct	6 ms	5120 KB	Output is correct
13	Correct	6 ms	4992 KB	Output is correct
14	Correct	8 ms	4992 KB	Output is correct
15	Correct	6 ms	5120 KB	Output is correct
16	Correct	6 ms	5120 KB	Output is correct
17	Correct	6 ms	4992 KB	Output is correct
18	Correct	8 ms	5120 KB	Output is correct
19	Correct	6 ms	4992 KB	Output is correct
20	Correct	7 ms	4992 KB	Output is correct
21	Correct	7 ms	4992 KB	Output is correct
22	Correct	7 ms	4992 KB	Output is correct
23	Correct	7 ms	5092 KB	Output is correct
24	Correct	6 ms	4992 KB	Output is correct
25	Correct	6 ms	5120 KB	Output is correct
26	Correct	7 ms	4992 KB	Output is correct
27	Correct	7 ms	5120 KB	Output is correct
28	Correct	7 ms	4992 KB	Output is correct
29	Correct	7 ms	4992 KB	Output is correct
30	Correct	7 ms	4992 KB	Output is correct
31	Correct	7 ms	5120 KB	Output is correct
32	Correct	7 ms	5120 KB	Output is correct
33	Correct	6 ms	4992 KB	Output is correct
34	Correct	7 ms	5120 KB	Output is correct
35	Correct	6 ms	5120 KB	Output is correct
36	Correct	6 ms	5120 KB	Output is correct
37	Correct	6 ms	4992 KB	Output is correct
38	Correct	6 ms	5120 KB	Output is correct
39	Correct	7 ms	4992 KB	Output is correct
40	Correct	7 ms	4992 KB	Output is correct
41	Correct	7 ms	4984 KB	Output is correct
42	Correct	7 ms	5248 KB	Output is correct
43	Correct	6 ms	5120 KB	Output is correct
44	Correct	7 ms	5120 KB	Output is correct
45	Correct	39 ms	4992 KB	Output is correct
46	Correct	7 ms	4992 KB	Output is correct
47	Correct	7 ms	5068 KB	Output is correct
48	Correct	6 ms	4992 KB	Output is correct
49	Correct	7 ms	4992 KB	Output is correct
50	Correct	7 ms	5120 KB	Output is correct
51	Correct	6 ms	5120 KB	Output is correct
52	Correct	7 ms	5120 KB	Output is correct
53	Correct	6 ms	5120 KB	Output is correct
54	Correct	6 ms	4992 KB	Output is correct
55	Correct	6 ms	5120 KB	Output is correct
56	Correct	7 ms	5120 KB	Output is correct
57	Correct	7 ms	5120 KB	Output is correct
58	Correct	7 ms	4992 KB	Output is correct
59	Correct	7 ms	4992 KB	Output is correct
60	Correct	7 ms	5120 KB	Output is correct
61	Correct	6 ms	4992 KB	Output is correct
62	Correct	8 ms	4992 KB	Output is correct
63	Correct	6 ms	4992 KB	Output is correct
64	Correct	6 ms	5120 KB	Output is correct
65	Correct	6 ms	5120 KB	Output is correct
66	Correct	7 ms	5120 KB	Output is correct
67	Correct	8 ms	5120 KB	Output is correct
68	Correct	7 ms	5092 KB	Output is correct
69	Correct	7 ms	4992 KB	Output is correct

Subtask #3
22.0 / 22.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	7 ms	5120 KB	Output is correct
2	Correct	1 ms	4992 KB	Output is correct
3	Correct	7 ms	5120 KB	Output is correct
4	Correct	6 ms	5120 KB	Output is correct
5	Correct	7 ms	4992 KB	Output is correct
6	Correct	6 ms	5120 KB	Output is correct
7	Correct	6 ms	4992 KB	Output is correct
8	Correct	6 ms	4992 KB	Output is correct
9	Correct	6 ms	5120 KB	Output is correct
10	Correct	8 ms	4992 KB	Output is correct
11	Correct	8 ms	5120 KB	Output is correct
12	Correct	6 ms	5120 KB	Output is correct
13	Correct	6 ms	4992 KB	Output is correct
14	Correct	8 ms	4992 KB	Output is correct
15	Correct	6 ms	5120 KB	Output is correct
16	Correct	6 ms	5120 KB	Output is correct
17	Correct	6 ms	4992 KB	Output is correct
18	Correct	8 ms	5120 KB	Output is correct
19	Correct	6 ms	4992 KB	Output is correct
20	Correct	7 ms	4992 KB	Output is correct
21	Correct	7 ms	4992 KB	Output is correct
22	Correct	7 ms	4992 KB	Output is correct
23	Correct	7 ms	5092 KB	Output is correct
24	Correct	6 ms	4992 KB	Output is correct
25	Correct	6 ms	5120 KB	Output is correct
26	Correct	7 ms	4992 KB	Output is correct
27	Correct	7 ms	5120 KB	Output is correct
28	Correct	7 ms	4992 KB	Output is correct
29	Correct	7 ms	4992 KB	Output is correct
30	Correct	7 ms	4992 KB	Output is correct
31	Correct	7 ms	5120 KB	Output is correct
32	Correct	7 ms	5120 KB	Output is correct
33	Correct	6 ms	4992 KB	Output is correct
34	Correct	7 ms	5120 KB	Output is correct
35	Correct	6 ms	5120 KB	Output is correct
36	Correct	6 ms	5120 KB	Output is correct
37	Correct	6 ms	4992 KB	Output is correct
38	Correct	6 ms	5120 KB	Output is correct
39	Correct	7 ms	4992 KB	Output is correct
40	Correct	7 ms	4992 KB	Output is correct
41	Correct	7 ms	4984 KB	Output is correct
42	Correct	7 ms	5248 KB	Output is correct
43	Correct	6 ms	5120 KB	Output is correct
44	Correct	7 ms	5120 KB	Output is correct
45	Correct	39 ms	4992 KB	Output is correct
46	Correct	7 ms	4992 KB	Output is correct
47	Correct	7 ms	5068 KB	Output is correct
48	Correct	6 ms	4992 KB	Output is correct
49	Correct	7 ms	4992 KB	Output is correct
50	Correct	7 ms	5120 KB	Output is correct
51	Correct	6 ms	5120 KB	Output is correct
52	Correct	7 ms	5120 KB	Output is correct
53	Correct	6 ms	5120 KB	Output is correct
54	Correct	6 ms	4992 KB	Output is correct
55	Correct	6 ms	5120 KB	Output is correct
56	Correct	7 ms	5120 KB	Output is correct
57	Correct	7 ms	5120 KB	Output is correct
58	Correct	7 ms	4992 KB	Output is correct
59	Correct	7 ms	4992 KB	Output is correct
60	Correct	7 ms	5120 KB	Output is correct
61	Correct	6 ms	4992 KB	Output is correct
62	Correct	8 ms	4992 KB	Output is correct
63	Correct	6 ms	4992 KB	Output is correct
64	Correct	6 ms	5120 KB	Output is correct
65	Correct	6 ms	5120 KB	Output is correct
66	Correct	7 ms	5120 KB	Output is correct
67	Correct	8 ms	5120 KB	Output is correct
68	Correct	7 ms	5092 KB	Output is correct
69	Correct	7 ms	4992 KB	Output is correct
70	Correct	8 ms	5120 KB	Output is correct
71	Correct	9 ms	5120 KB	Output is correct
72	Correct	8 ms	5120 KB	Output is correct
73	Correct	6 ms	4992 KB	Output is correct
74	Correct	6 ms	5120 KB	Output is correct
75	Correct	8 ms	5120 KB	Output is correct
76	Correct	7 ms	5120 KB	Output is correct
77	Correct	7 ms	5120 KB	Output is correct
78	Correct	6 ms	4992 KB	Output is correct
79	Correct	6 ms	5120 KB	Output is correct
80	Correct	7 ms	5120 KB	Output is correct
81	Correct	8 ms	5120 KB	Output is correct
82	Correct	7 ms	5120 KB	Output is correct
83	Correct	7 ms	5120 KB	Output is correct
84	Correct	7 ms	5120 KB	Output is correct
85	Correct	7 ms	5120 KB	Output is correct
86	Correct	7 ms	5004 KB	Output is correct
87	Correct	7 ms	5120 KB	Output is correct
88	Correct	6 ms	4992 KB	Output is correct
89	Correct	8 ms	5120 KB	Output is correct
90	Correct	7 ms	5248 KB	Output is correct
91	Correct	7 ms	5120 KB	Output is correct
92	Correct	7 ms	5092 KB	Output is correct
93	Correct	8 ms	5120 KB	Output is correct
94	Correct	7 ms	5120 KB	Output is correct
95	Correct	6 ms	5120 KB	Output is correct
96	Correct	7 ms	5120 KB	Output is correct
97	Correct	8 ms	5120 KB	Output is correct
98	Correct	7 ms	5120 KB	Output is correct

Subtask #4
0 / 19.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	42 ms	13828 KB	Output is correct
2	Correct	8 ms	5888 KB	Output is correct
3	Correct	29 ms	9080 KB	Output is correct
4	Correct	36 ms	12776 KB	Output is correct
5	Correct	84 ms	15864 KB	Output is correct
6	Correct	94 ms	11768 KB	Output is correct
7	Correct	92 ms	15860 KB	Output is correct
8	Correct	23 ms	9212 KB	Output is correct
9	Correct	20 ms	8960 KB	Output is correct
10	Correct	117 ms	16116 KB	Output is correct
11	Correct	81 ms	14100 KB	Output is correct
12	Correct	66 ms	12712 KB	Output is correct
13	Execution timed out	3033 ms	5916 KB	Time limit exceeded
14	Halted	0 ms	0 KB	-

Subtask #5
0 / 26.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	7 ms	5120 KB	Output is correct
2	Correct	1 ms	4992 KB	Output is correct
3	Correct	7 ms	5120 KB	Output is correct
4	Correct	6 ms	5120 KB	Output is correct
5	Correct	7 ms	4992 KB	Output is correct
6	Correct	6 ms	5120 KB	Output is correct
7	Correct	6 ms	4992 KB	Output is correct
8	Correct	6 ms	4992 KB	Output is correct
9	Correct	6 ms	5120 KB	Output is correct
10	Correct	8 ms	4992 KB	Output is correct
11	Correct	8 ms	5120 KB	Output is correct
12	Correct	6 ms	5120 KB	Output is correct
13	Correct	6 ms	4992 KB	Output is correct
14	Correct	8 ms	4992 KB	Output is correct
15	Correct	6 ms	5120 KB	Output is correct
16	Correct	6 ms	5120 KB	Output is correct
17	Correct	6 ms	4992 KB	Output is correct
18	Correct	8 ms	5120 KB	Output is correct
19	Correct	6 ms	4992 KB	Output is correct
20	Correct	7 ms	4992 KB	Output is correct
21	Correct	7 ms	4992 KB	Output is correct
22	Correct	7 ms	4992 KB	Output is correct
23	Correct	7 ms	5092 KB	Output is correct
24	Correct	6 ms	4992 KB	Output is correct
25	Correct	6 ms	5120 KB	Output is correct
26	Correct	7 ms	4992 KB	Output is correct
27	Correct	7 ms	5120 KB	Output is correct
28	Correct	7 ms	4992 KB	Output is correct
29	Correct	7 ms	4992 KB	Output is correct
30	Correct	7 ms	4992 KB	Output is correct
31	Correct	7 ms	5120 KB	Output is correct
32	Correct	7 ms	5120 KB	Output is correct
33	Correct	6 ms	4992 KB	Output is correct
34	Correct	7 ms	5120 KB	Output is correct
35	Correct	6 ms	5120 KB	Output is correct
36	Correct	6 ms	5120 KB	Output is correct
37	Correct	6 ms	4992 KB	Output is correct
38	Correct	6 ms	5120 KB	Output is correct
39	Correct	7 ms	4992 KB	Output is correct
40	Correct	7 ms	4992 KB	Output is correct
41	Correct	7 ms	4984 KB	Output is correct
42	Correct	7 ms	5248 KB	Output is correct
43	Correct	6 ms	5120 KB	Output is correct
44	Correct	7 ms	5120 KB	Output is correct
45	Correct	39 ms	4992 KB	Output is correct
46	Correct	7 ms	4992 KB	Output is correct
47	Correct	7 ms	5068 KB	Output is correct
48	Correct	6 ms	4992 KB	Output is correct
49	Correct	7 ms	4992 KB	Output is correct
50	Correct	7 ms	5120 KB	Output is correct
51	Correct	6 ms	5120 KB	Output is correct
52	Correct	7 ms	5120 KB	Output is correct
53	Correct	6 ms	5120 KB	Output is correct
54	Correct	6 ms	4992 KB	Output is correct
55	Correct	6 ms	5120 KB	Output is correct
56	Correct	7 ms	5120 KB	Output is correct
57	Correct	7 ms	5120 KB	Output is correct
58	Correct	7 ms	4992 KB	Output is correct
59	Correct	7 ms	4992 KB	Output is correct
60	Correct	7 ms	5120 KB	Output is correct
61	Correct	6 ms	4992 KB	Output is correct
62	Correct	8 ms	4992 KB	Output is correct
63	Correct	6 ms	4992 KB	Output is correct
64	Correct	6 ms	5120 KB	Output is correct
65	Correct	6 ms	5120 KB	Output is correct
66	Correct	7 ms	5120 KB	Output is correct
67	Correct	8 ms	5120 KB	Output is correct
68	Correct	7 ms	5092 KB	Output is correct
69	Correct	7 ms	4992 KB	Output is correct
70	Correct	8 ms	5120 KB	Output is correct
71	Correct	9 ms	5120 KB	Output is correct
72	Correct	8 ms	5120 KB	Output is correct
73	Correct	6 ms	4992 KB	Output is correct
74	Correct	6 ms	5120 KB	Output is correct
75	Correct	8 ms	5120 KB	Output is correct
76	Correct	7 ms	5120 KB	Output is correct
77	Correct	7 ms	5120 KB	Output is correct
78	Correct	6 ms	4992 KB	Output is correct
79	Correct	6 ms	5120 KB	Output is correct
80	Correct	7 ms	5120 KB	Output is correct
81	Correct	8 ms	5120 KB	Output is correct
82	Correct	7 ms	5120 KB	Output is correct
83	Correct	7 ms	5120 KB	Output is correct
84	Correct	7 ms	5120 KB	Output is correct
85	Correct	7 ms	5120 KB	Output is correct
86	Correct	7 ms	5004 KB	Output is correct
87	Correct	7 ms	5120 KB	Output is correct
88	Correct	6 ms	4992 KB	Output is correct
89	Correct	8 ms	5120 KB	Output is correct
90	Correct	7 ms	5248 KB	Output is correct
91	Correct	7 ms	5120 KB	Output is correct
92	Correct	7 ms	5092 KB	Output is correct
93	Correct	8 ms	5120 KB	Output is correct
94	Correct	7 ms	5120 KB	Output is correct
95	Correct	6 ms	5120 KB	Output is correct
96	Correct	7 ms	5120 KB	Output is correct
97	Correct	8 ms	5120 KB	Output is correct
98	Correct	7 ms	5120 KB	Output is correct
99	Correct	42 ms	13828 KB	Output is correct
100	Correct	8 ms	5888 KB	Output is correct
101	Correct	29 ms	9080 KB	Output is correct
102	Correct	36 ms	12776 KB	Output is correct
103	Correct	84 ms	15864 KB	Output is correct
104	Correct	94 ms	11768 KB	Output is correct
105	Correct	92 ms	15860 KB	Output is correct
106	Correct	23 ms	9212 KB	Output is correct
107	Correct	20 ms	8960 KB	Output is correct
108	Correct	117 ms	16116 KB	Output is correct
109	Correct	81 ms	14100 KB	Output is correct
110	Correct	66 ms	12712 KB	Output is correct
111	Execution timed out	3033 ms	5916 KB	Time limit exceeded
112	Halted	0 ms	0 KB	-

Submission #106144

Compilation message

Subtask #1 13.0 / 13.0

Subtask #2 20.0 / 20.0

Subtask #3 22.0 / 22.0

Subtask #4 0 / 19.0

Subtask #5 0 / 26.0

Subtask #1
13.0 / 13.0

Subtask #2
20.0 / 20.0

Subtask #3
22.0 / 22.0

Subtask #4
0 / 19.0

Subtask #5
0 / 26.0