Submission #106122

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
106122	2019-04-16T16:21:57 Z	Noam527	Alternating Current (BOI18_alternating)	C++17	55 / 100	9 ms	5248 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;
	/*
	vis[v] = 1;
	for (const auto &i : g[v]) {
		path.push_back(i.i);
		if (i.to != v - 1 && dfs(i.to, v + n)) return true;
		path.pop_back();
	}
	*/
	if (dfs(v, v + n)) return true;
	return false;
}

int main() {
	ios::sync_with_stdio(0), cin.tie(0);
	cin >> n >> m;
	if (n > 1000) finish(-1); // quick please
	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	6 ms	5120 KB	Output is correct
3	Correct	8 ms	5120 KB	Output is correct
4	Correct	7 ms	4992 KB	Output is correct
5	Correct	8 ms	5120 KB	Output is correct
6	Correct	8 ms	4992 KB	Output is correct
7	Correct	7 ms	5120 KB	Output is correct
8	Correct	4 ms	4992 KB	Output is correct
9	Correct	7 ms	4992 KB	Output is correct
10	Correct	8 ms	4992 KB	Output is correct
11	Correct	7 ms	4864 KB	Output is correct
12	Correct	9 ms	4992 KB	Output is correct
13	Correct	8 ms	5120 KB	Output is correct
14	Correct	8 ms	5120 KB	Output is correct
15	Correct	7 ms	4992 KB	Output is correct
16	Correct	7 ms	5120 KB	Output is correct
17	Correct	7 ms	4992 KB	Output is correct
18	Correct	8 ms	4992 KB	Output is correct
19	Correct	8 ms	5112 KB	Output is correct
20	Correct	7 ms	4992 KB	Output is correct
21	Correct	6 ms	4992 KB	Output is correct
22	Correct	7 ms	5120 KB	Output is correct
23	Correct	6 ms	4992 KB	Output is correct
24	Correct	8 ms	4992 KB	Output is correct
25	Correct	7 ms	5120 KB	Output is correct
26	Correct	8 ms	4992 KB	Output is correct
27	Correct	8 ms	4992 KB	Output is correct
28	Correct	8 ms	4992 KB	Output is correct
29	Correct	8 ms	4992 KB	Output is correct
30	Correct	6 ms	5120 KB	Output is correct
31	Correct	8 ms	5120 KB	Output is correct
32	Correct	7 ms	4992 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	4992 KB	Output is correct
37	Correct	6 ms	4992 KB	Output is correct
38	Correct	7 ms	5120 KB	Output is correct
39	Correct	6 ms	5120 KB	Output is correct
40	Correct	8 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	6 ms	5120 KB	Output is correct
3	Correct	8 ms	5120 KB	Output is correct
4	Correct	7 ms	4992 KB	Output is correct
5	Correct	8 ms	5120 KB	Output is correct
6	Correct	8 ms	4992 KB	Output is correct
7	Correct	7 ms	5120 KB	Output is correct
8	Correct	4 ms	4992 KB	Output is correct
9	Correct	7 ms	4992 KB	Output is correct
10	Correct	8 ms	4992 KB	Output is correct
11	Correct	7 ms	4864 KB	Output is correct
12	Correct	9 ms	4992 KB	Output is correct
13	Correct	8 ms	5120 KB	Output is correct
14	Correct	8 ms	5120 KB	Output is correct
15	Correct	7 ms	4992 KB	Output is correct
16	Correct	7 ms	5120 KB	Output is correct
17	Correct	7 ms	4992 KB	Output is correct
18	Correct	8 ms	4992 KB	Output is correct
19	Correct	8 ms	5112 KB	Output is correct
20	Correct	7 ms	4992 KB	Output is correct
21	Correct	6 ms	4992 KB	Output is correct
22	Correct	7 ms	5120 KB	Output is correct
23	Correct	6 ms	4992 KB	Output is correct
24	Correct	8 ms	4992 KB	Output is correct
25	Correct	7 ms	5120 KB	Output is correct
26	Correct	8 ms	4992 KB	Output is correct
27	Correct	8 ms	4992 KB	Output is correct
28	Correct	8 ms	4992 KB	Output is correct
29	Correct	8 ms	4992 KB	Output is correct
30	Correct	6 ms	5120 KB	Output is correct
31	Correct	8 ms	5120 KB	Output is correct
32	Correct	7 ms	4992 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	4992 KB	Output is correct
37	Correct	6 ms	4992 KB	Output is correct
38	Correct	7 ms	5120 KB	Output is correct
39	Correct	6 ms	5120 KB	Output is correct
40	Correct	8 ms	4992 KB	Output is correct
41	Correct	6 ms	4992 KB	Output is correct
42	Correct	6 ms	5120 KB	Output is correct
43	Correct	7 ms	5120 KB	Output is correct
44	Correct	7 ms	5120 KB	Output is correct
45	Correct	6 ms	4992 KB	Output is correct
46	Correct	7 ms	5092 KB	Output is correct
47	Correct	7 ms	5120 KB	Output is correct
48	Correct	8 ms	4992 KB	Output is correct
49	Correct	8 ms	5120 KB	Output is correct
50	Correct	8 ms	4992 KB	Output is correct
51	Correct	7 ms	5120 KB	Output is correct
52	Correct	8 ms	4992 KB	Output is correct
53	Correct	8 ms	4992 KB	Output is correct
54	Correct	7 ms	5120 KB	Output is correct
55	Correct	7 ms	5120 KB	Output is correct
56	Correct	8 ms	5120 KB	Output is correct
57	Correct	7 ms	4992 KB	Output is correct
58	Correct	8 ms	4992 KB	Output is correct
59	Correct	6 ms	4992 KB	Output is correct
60	Correct	6 ms	4992 KB	Output is correct
61	Correct	7 ms	4992 KB	Output is correct
62	Correct	6 ms	4992 KB	Output is correct
63	Correct	7 ms	4992 KB	Output is correct
64	Correct	8 ms	5120 KB	Output is correct
65	Correct	7 ms	5120 KB	Output is correct
66	Correct	8 ms	5120 KB	Output is correct
67	Correct	8 ms	5120 KB	Output is correct
68	Correct	7 ms	5120 KB	Output is correct
69	Correct	6 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	6 ms	5120 KB	Output is correct
3	Correct	8 ms	5120 KB	Output is correct
4	Correct	7 ms	4992 KB	Output is correct
5	Correct	8 ms	5120 KB	Output is correct
6	Correct	8 ms	4992 KB	Output is correct
7	Correct	7 ms	5120 KB	Output is correct
8	Correct	4 ms	4992 KB	Output is correct
9	Correct	7 ms	4992 KB	Output is correct
10	Correct	8 ms	4992 KB	Output is correct
11	Correct	7 ms	4864 KB	Output is correct
12	Correct	9 ms	4992 KB	Output is correct
13	Correct	8 ms	5120 KB	Output is correct
14	Correct	8 ms	5120 KB	Output is correct
15	Correct	7 ms	4992 KB	Output is correct
16	Correct	7 ms	5120 KB	Output is correct
17	Correct	7 ms	4992 KB	Output is correct
18	Correct	8 ms	4992 KB	Output is correct
19	Correct	8 ms	5112 KB	Output is correct
20	Correct	7 ms	4992 KB	Output is correct
21	Correct	6 ms	4992 KB	Output is correct
22	Correct	7 ms	5120 KB	Output is correct
23	Correct	6 ms	4992 KB	Output is correct
24	Correct	8 ms	4992 KB	Output is correct
25	Correct	7 ms	5120 KB	Output is correct
26	Correct	8 ms	4992 KB	Output is correct
27	Correct	8 ms	4992 KB	Output is correct
28	Correct	8 ms	4992 KB	Output is correct
29	Correct	8 ms	4992 KB	Output is correct
30	Correct	6 ms	5120 KB	Output is correct
31	Correct	8 ms	5120 KB	Output is correct
32	Correct	7 ms	4992 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	4992 KB	Output is correct
37	Correct	6 ms	4992 KB	Output is correct
38	Correct	7 ms	5120 KB	Output is correct
39	Correct	6 ms	5120 KB	Output is correct
40	Correct	8 ms	4992 KB	Output is correct
41	Correct	6 ms	4992 KB	Output is correct
42	Correct	6 ms	5120 KB	Output is correct
43	Correct	7 ms	5120 KB	Output is correct
44	Correct	7 ms	5120 KB	Output is correct
45	Correct	6 ms	4992 KB	Output is correct
46	Correct	7 ms	5092 KB	Output is correct
47	Correct	7 ms	5120 KB	Output is correct
48	Correct	8 ms	4992 KB	Output is correct
49	Correct	8 ms	5120 KB	Output is correct
50	Correct	8 ms	4992 KB	Output is correct
51	Correct	7 ms	5120 KB	Output is correct
52	Correct	8 ms	4992 KB	Output is correct
53	Correct	8 ms	4992 KB	Output is correct
54	Correct	7 ms	5120 KB	Output is correct
55	Correct	7 ms	5120 KB	Output is correct
56	Correct	8 ms	5120 KB	Output is correct
57	Correct	7 ms	4992 KB	Output is correct
58	Correct	8 ms	4992 KB	Output is correct
59	Correct	6 ms	4992 KB	Output is correct
60	Correct	6 ms	4992 KB	Output is correct
61	Correct	7 ms	4992 KB	Output is correct
62	Correct	6 ms	4992 KB	Output is correct
63	Correct	7 ms	4992 KB	Output is correct
64	Correct	8 ms	5120 KB	Output is correct
65	Correct	7 ms	5120 KB	Output is correct
66	Correct	8 ms	5120 KB	Output is correct
67	Correct	8 ms	5120 KB	Output is correct
68	Correct	7 ms	5120 KB	Output is correct
69	Correct	6 ms	4992 KB	Output is correct
70	Correct	7 ms	5120 KB	Output is correct
71	Correct	7 ms	5248 KB	Output is correct
72	Correct	7 ms	5120 KB	Output is correct
73	Correct	7 ms	4992 KB	Output is correct
74	Correct	7 ms	4992 KB	Output is correct
75	Correct	8 ms	4992 KB	Output is correct
76	Correct	8 ms	5120 KB	Output is correct
77	Correct	8 ms	5120 KB	Output is correct
78	Correct	7 ms	4992 KB	Output is correct
79	Correct	8 ms	5120 KB	Output is correct
80	Correct	8 ms	5120 KB	Output is correct
81	Correct	7 ms	5120 KB	Output is correct
82	Correct	9 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	8 ms	4992 KB	Output is correct
86	Correct	8 ms	4992 KB	Output is correct
87	Correct	9 ms	5120 KB	Output is correct
88	Correct	7 ms	4992 KB	Output is correct
89	Correct	9 ms	5120 KB	Output is correct
90	Correct	7 ms	5120 KB	Output is correct
91	Correct	8 ms	5120 KB	Output is correct
92	Correct	7 ms	5120 KB	Output is correct
93	Correct	7 ms	5120 KB	Output is correct
94	Correct	8 ms	5120 KB	Output is correct
95	Correct	7 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	Incorrect	7 ms	5060 KB	-1 is not a string of length exactly 100000
2	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	6 ms	5120 KB	Output is correct
3	Correct	8 ms	5120 KB	Output is correct
4	Correct	7 ms	4992 KB	Output is correct
5	Correct	8 ms	5120 KB	Output is correct
6	Correct	8 ms	4992 KB	Output is correct
7	Correct	7 ms	5120 KB	Output is correct
8	Correct	4 ms	4992 KB	Output is correct
9	Correct	7 ms	4992 KB	Output is correct
10	Correct	8 ms	4992 KB	Output is correct
11	Correct	7 ms	4864 KB	Output is correct
12	Correct	9 ms	4992 KB	Output is correct
13	Correct	8 ms	5120 KB	Output is correct
14	Correct	8 ms	5120 KB	Output is correct
15	Correct	7 ms	4992 KB	Output is correct
16	Correct	7 ms	5120 KB	Output is correct
17	Correct	7 ms	4992 KB	Output is correct
18	Correct	8 ms	4992 KB	Output is correct
19	Correct	8 ms	5112 KB	Output is correct
20	Correct	7 ms	4992 KB	Output is correct
21	Correct	6 ms	4992 KB	Output is correct
22	Correct	7 ms	5120 KB	Output is correct
23	Correct	6 ms	4992 KB	Output is correct
24	Correct	8 ms	4992 KB	Output is correct
25	Correct	7 ms	5120 KB	Output is correct
26	Correct	8 ms	4992 KB	Output is correct
27	Correct	8 ms	4992 KB	Output is correct
28	Correct	8 ms	4992 KB	Output is correct
29	Correct	8 ms	4992 KB	Output is correct
30	Correct	6 ms	5120 KB	Output is correct
31	Correct	8 ms	5120 KB	Output is correct
32	Correct	7 ms	4992 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	4992 KB	Output is correct
37	Correct	6 ms	4992 KB	Output is correct
38	Correct	7 ms	5120 KB	Output is correct
39	Correct	6 ms	5120 KB	Output is correct
40	Correct	8 ms	4992 KB	Output is correct
41	Correct	6 ms	4992 KB	Output is correct
42	Correct	6 ms	5120 KB	Output is correct
43	Correct	7 ms	5120 KB	Output is correct
44	Correct	7 ms	5120 KB	Output is correct
45	Correct	6 ms	4992 KB	Output is correct
46	Correct	7 ms	5092 KB	Output is correct
47	Correct	7 ms	5120 KB	Output is correct
48	Correct	8 ms	4992 KB	Output is correct
49	Correct	8 ms	5120 KB	Output is correct
50	Correct	8 ms	4992 KB	Output is correct
51	Correct	7 ms	5120 KB	Output is correct
52	Correct	8 ms	4992 KB	Output is correct
53	Correct	8 ms	4992 KB	Output is correct
54	Correct	7 ms	5120 KB	Output is correct
55	Correct	7 ms	5120 KB	Output is correct
56	Correct	8 ms	5120 KB	Output is correct
57	Correct	7 ms	4992 KB	Output is correct
58	Correct	8 ms	4992 KB	Output is correct
59	Correct	6 ms	4992 KB	Output is correct
60	Correct	6 ms	4992 KB	Output is correct
61	Correct	7 ms	4992 KB	Output is correct
62	Correct	6 ms	4992 KB	Output is correct
63	Correct	7 ms	4992 KB	Output is correct
64	Correct	8 ms	5120 KB	Output is correct
65	Correct	7 ms	5120 KB	Output is correct
66	Correct	8 ms	5120 KB	Output is correct
67	Correct	8 ms	5120 KB	Output is correct
68	Correct	7 ms	5120 KB	Output is correct
69	Correct	6 ms	4992 KB	Output is correct
70	Correct	7 ms	5120 KB	Output is correct
71	Correct	7 ms	5248 KB	Output is correct
72	Correct	7 ms	5120 KB	Output is correct
73	Correct	7 ms	4992 KB	Output is correct
74	Correct	7 ms	4992 KB	Output is correct
75	Correct	8 ms	4992 KB	Output is correct
76	Correct	8 ms	5120 KB	Output is correct
77	Correct	8 ms	5120 KB	Output is correct
78	Correct	7 ms	4992 KB	Output is correct
79	Correct	8 ms	5120 KB	Output is correct
80	Correct	8 ms	5120 KB	Output is correct
81	Correct	7 ms	5120 KB	Output is correct
82	Correct	9 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	8 ms	4992 KB	Output is correct
86	Correct	8 ms	4992 KB	Output is correct
87	Correct	9 ms	5120 KB	Output is correct
88	Correct	7 ms	4992 KB	Output is correct
89	Correct	9 ms	5120 KB	Output is correct
90	Correct	7 ms	5120 KB	Output is correct
91	Correct	8 ms	5120 KB	Output is correct
92	Correct	7 ms	5120 KB	Output is correct
93	Correct	7 ms	5120 KB	Output is correct
94	Correct	8 ms	5120 KB	Output is correct
95	Correct	7 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	Incorrect	7 ms	5060 KB	-1 is not a string of length exactly 100000
100	Halted	0 ms	0 KB	-

Submission #106122

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