Submission #106164

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
106164	2019-04-17T00:13:23 Z	Noam527	Alternating Current (BOI18_alternating)	C++17	100 / 100	131 ms	15476 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; int nxtcol = 5;
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] == nxtcol) return false;
	vis[v % n] = nxtcol;
	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';
	}
	nxtcol++;
  	vis[v] = nxtcol;
	for (const auto &i : g[v]) {
		if (i.to != v - 1) {
			path.push_back(i.i);
			if (dfs(i.to, v + n)) return true;
			path.pop_back();
		}
	}
	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	6 ms	4992 KB	Output is correct
2	Correct	6 ms	5120 KB	Output is correct
3	Correct	6 ms	5120 KB	Output is correct
4	Correct	6 ms	5120 KB	Output is correct
5	Correct	6 ms	5120 KB	Output is correct
6	Correct	6 ms	5120 KB	Output is correct
7	Correct	8 ms	5120 KB	Output is correct
8	Correct	7 ms	4992 KB	Output is correct
9	Correct	7 ms	4992 KB	Output is correct
10	Correct	7 ms	4992 KB	Output is correct
11	Correct	6 ms	4992 KB	Output is correct
12	Correct	7 ms	5120 KB	Output is correct
13	Correct	6 ms	5120 KB	Output is correct
14	Correct	7 ms	5120 KB	Output is correct
15	Correct	6 ms	4992 KB	Output is correct
16	Correct	6 ms	4992 KB	Output is correct
17	Correct	6 ms	4992 KB	Output is correct
18	Correct	5 ms	4992 KB	Output is correct
19	Correct	6 ms	4992 KB	Output is correct
20	Correct	7 ms	4992 KB	Output is correct
21	Correct	6 ms	4992 KB	Output is correct
22	Correct	6 ms	4992 KB	Output is correct
23	Correct	6 ms	5120 KB	Output is correct
24	Correct	7 ms	5120 KB	Output is correct
25	Correct	7 ms	5120 KB	Output is correct
26	Correct	5 ms	5120 KB	Output is correct
27	Correct	6 ms	5120 KB	Output is correct
28	Correct	5 ms	5120 KB	Output is correct
29	Correct	6 ms	5120 KB	Output is correct
30	Correct	5 ms	4992 KB	Output is correct
31	Correct	6 ms	5120 KB	Output is correct
32	Correct	6 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	4992 KB	Output is correct
36	Correct	6 ms	4992 KB	Output is correct
37	Correct	6 ms	4992 KB	Output is correct
38	Correct	5 ms	4992 KB	Output is correct
39	Correct	5 ms	4992 KB	Output is correct
40	Correct	5 ms	4992 KB	Output is correct

Subtask #2
20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	6 ms	4992 KB	Output is correct
2	Correct	6 ms	5120 KB	Output is correct
3	Correct	6 ms	5120 KB	Output is correct
4	Correct	6 ms	5120 KB	Output is correct
5	Correct	6 ms	5120 KB	Output is correct
6	Correct	6 ms	5120 KB	Output is correct
7	Correct	8 ms	5120 KB	Output is correct
8	Correct	7 ms	4992 KB	Output is correct
9	Correct	7 ms	4992 KB	Output is correct
10	Correct	7 ms	4992 KB	Output is correct
11	Correct	6 ms	4992 KB	Output is correct
12	Correct	7 ms	5120 KB	Output is correct
13	Correct	6 ms	5120 KB	Output is correct
14	Correct	7 ms	5120 KB	Output is correct
15	Correct	6 ms	4992 KB	Output is correct
16	Correct	6 ms	4992 KB	Output is correct
17	Correct	6 ms	4992 KB	Output is correct
18	Correct	5 ms	4992 KB	Output is correct
19	Correct	6 ms	4992 KB	Output is correct
20	Correct	7 ms	4992 KB	Output is correct
21	Correct	6 ms	4992 KB	Output is correct
22	Correct	6 ms	4992 KB	Output is correct
23	Correct	6 ms	5120 KB	Output is correct
24	Correct	7 ms	5120 KB	Output is correct
25	Correct	7 ms	5120 KB	Output is correct
26	Correct	5 ms	5120 KB	Output is correct
27	Correct	6 ms	5120 KB	Output is correct
28	Correct	5 ms	5120 KB	Output is correct
29	Correct	6 ms	5120 KB	Output is correct
30	Correct	5 ms	4992 KB	Output is correct
31	Correct	6 ms	5120 KB	Output is correct
32	Correct	6 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	4992 KB	Output is correct
36	Correct	6 ms	4992 KB	Output is correct
37	Correct	6 ms	4992 KB	Output is correct
38	Correct	5 ms	4992 KB	Output is correct
39	Correct	5 ms	4992 KB	Output is correct
40	Correct	5 ms	4992 KB	Output is correct
41	Correct	5 ms	4992 KB	Output is correct
42	Correct	5 ms	4992 KB	Output is correct
43	Correct	5 ms	5120 KB	Output is correct
44	Correct	5 ms	4992 KB	Output is correct
45	Correct	6 ms	4992 KB	Output is correct
46	Correct	6 ms	5120 KB	Output is correct
47	Correct	7 ms	4992 KB	Output is correct
48	Correct	6 ms	4992 KB	Output is correct
49	Correct	7 ms	5008 KB	Output is correct
50	Correct	5 ms	4992 KB	Output is correct
51	Correct	6 ms	4992 KB	Output is correct
52	Correct	6 ms	4992 KB	Output is correct
53	Correct	7 ms	4992 KB	Output is correct
54	Correct	7 ms	4992 KB	Output is correct
55	Correct	5 ms	5164 KB	Output is correct
56	Correct	6 ms	5120 KB	Output is correct
57	Correct	7 ms	4992 KB	Output is correct
58	Correct	6 ms	4992 KB	Output is correct
59	Correct	7 ms	4992 KB	Output is correct
60	Correct	6 ms	5120 KB	Output is correct
61	Correct	7 ms	5120 KB	Output is correct
62	Correct	6 ms	5120 KB	Output is correct
63	Correct	7 ms	4992 KB	Output is correct
64	Correct	6 ms	4992 KB	Output is correct
65	Correct	6 ms	5120 KB	Output is correct
66	Correct	6 ms	5120 KB	Output is correct
67	Correct	6 ms	4992 KB	Output is correct
68	Correct	6 ms	4992 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	6 ms	4992 KB	Output is correct
2	Correct	6 ms	5120 KB	Output is correct
3	Correct	6 ms	5120 KB	Output is correct
4	Correct	6 ms	5120 KB	Output is correct
5	Correct	6 ms	5120 KB	Output is correct
6	Correct	6 ms	5120 KB	Output is correct
7	Correct	8 ms	5120 KB	Output is correct
8	Correct	7 ms	4992 KB	Output is correct
9	Correct	7 ms	4992 KB	Output is correct
10	Correct	7 ms	4992 KB	Output is correct
11	Correct	6 ms	4992 KB	Output is correct
12	Correct	7 ms	5120 KB	Output is correct
13	Correct	6 ms	5120 KB	Output is correct
14	Correct	7 ms	5120 KB	Output is correct
15	Correct	6 ms	4992 KB	Output is correct
16	Correct	6 ms	4992 KB	Output is correct
17	Correct	6 ms	4992 KB	Output is correct
18	Correct	5 ms	4992 KB	Output is correct
19	Correct	6 ms	4992 KB	Output is correct
20	Correct	7 ms	4992 KB	Output is correct
21	Correct	6 ms	4992 KB	Output is correct
22	Correct	6 ms	4992 KB	Output is correct
23	Correct	6 ms	5120 KB	Output is correct
24	Correct	7 ms	5120 KB	Output is correct
25	Correct	7 ms	5120 KB	Output is correct
26	Correct	5 ms	5120 KB	Output is correct
27	Correct	6 ms	5120 KB	Output is correct
28	Correct	5 ms	5120 KB	Output is correct
29	Correct	6 ms	5120 KB	Output is correct
30	Correct	5 ms	4992 KB	Output is correct
31	Correct	6 ms	5120 KB	Output is correct
32	Correct	6 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	4992 KB	Output is correct
36	Correct	6 ms	4992 KB	Output is correct
37	Correct	6 ms	4992 KB	Output is correct
38	Correct	5 ms	4992 KB	Output is correct
39	Correct	5 ms	4992 KB	Output is correct
40	Correct	5 ms	4992 KB	Output is correct
41	Correct	5 ms	4992 KB	Output is correct
42	Correct	5 ms	4992 KB	Output is correct
43	Correct	5 ms	5120 KB	Output is correct
44	Correct	5 ms	4992 KB	Output is correct
45	Correct	6 ms	4992 KB	Output is correct
46	Correct	6 ms	5120 KB	Output is correct
47	Correct	7 ms	4992 KB	Output is correct
48	Correct	6 ms	4992 KB	Output is correct
49	Correct	7 ms	5008 KB	Output is correct
50	Correct	5 ms	4992 KB	Output is correct
51	Correct	6 ms	4992 KB	Output is correct
52	Correct	6 ms	4992 KB	Output is correct
53	Correct	7 ms	4992 KB	Output is correct
54	Correct	7 ms	4992 KB	Output is correct
55	Correct	5 ms	5164 KB	Output is correct
56	Correct	6 ms	5120 KB	Output is correct
57	Correct	7 ms	4992 KB	Output is correct
58	Correct	6 ms	4992 KB	Output is correct
59	Correct	7 ms	4992 KB	Output is correct
60	Correct	6 ms	5120 KB	Output is correct
61	Correct	7 ms	5120 KB	Output is correct
62	Correct	6 ms	5120 KB	Output is correct
63	Correct	7 ms	4992 KB	Output is correct
64	Correct	6 ms	4992 KB	Output is correct
65	Correct	6 ms	5120 KB	Output is correct
66	Correct	6 ms	5120 KB	Output is correct
67	Correct	6 ms	4992 KB	Output is correct
68	Correct	6 ms	4992 KB	Output is correct
69	Correct	6 ms	4992 KB	Output is correct
70	Correct	6 ms	5120 KB	Output is correct
71	Correct	6 ms	5120 KB	Output is correct
72	Correct	5 ms	4992 KB	Output is correct
73	Correct	6 ms	4992 KB	Output is correct
74	Correct	8 ms	5120 KB	Output is correct
75	Correct	6 ms	4992 KB	Output is correct
76	Correct	7 ms	5120 KB	Output is correct
77	Correct	7 ms	5120 KB	Output is correct
78	Correct	7 ms	4980 KB	Output is correct
79	Correct	7 ms	5120 KB	Output is correct
80	Correct	7 ms	5120 KB	Output is correct
81	Correct	7 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	9 ms	5120 KB	Output is correct
85	Correct	7 ms	5120 KB	Output is correct
86	Correct	8 ms	5120 KB	Output is correct
87	Correct	6 ms	5120 KB	Output is correct
88	Correct	6 ms	5120 KB	Output is correct
89	Correct	6 ms	5120 KB	Output is correct
90	Correct	8 ms	5120 KB	Output is correct
91	Correct	6 ms	5120 KB	Output is correct
92	Correct	6 ms	5036 KB	Output is correct
93	Correct	6 ms	5120 KB	Output is correct
94	Correct	8 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	6 ms	5120 KB	Output is correct

Subtask #4
19.0 / 19.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	40 ms	13800 KB	Output is correct
2	Correct	6 ms	5760 KB	Output is correct
3	Correct	22 ms	8576 KB	Output is correct
4	Correct	35 ms	12152 KB	Output is correct
5	Correct	102 ms	12404 KB	Output is correct
6	Correct	87 ms	10616 KB	Output is correct
7	Correct	86 ms	12840 KB	Output is correct
8	Correct	14 ms	8576 KB	Output is correct
9	Correct	14 ms	8576 KB	Output is correct
10	Correct	115 ms	12660 KB	Output is correct
11	Correct	67 ms	11384 KB	Output is correct
12	Correct	75 ms	11768 KB	Output is correct
13	Correct	7 ms	5888 KB	Output is correct
14	Correct	9 ms	5888 KB	Output is correct
15	Correct	116 ms	15164 KB	Output is correct
16	Correct	37 ms	11644 KB	Output is correct
17	Correct	131 ms	15476 KB	Output is correct
18	Correct	42 ms	8056 KB	Output is correct
19	Correct	10 ms	5760 KB	Output is correct
20	Correct	38 ms	10712 KB	Output is correct

Subtask #5
26.0 / 26.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	6 ms	4992 KB	Output is correct
2	Correct	6 ms	5120 KB	Output is correct
3	Correct	6 ms	5120 KB	Output is correct
4	Correct	6 ms	5120 KB	Output is correct
5	Correct	6 ms	5120 KB	Output is correct
6	Correct	6 ms	5120 KB	Output is correct
7	Correct	8 ms	5120 KB	Output is correct
8	Correct	7 ms	4992 KB	Output is correct
9	Correct	7 ms	4992 KB	Output is correct
10	Correct	7 ms	4992 KB	Output is correct
11	Correct	6 ms	4992 KB	Output is correct
12	Correct	7 ms	5120 KB	Output is correct
13	Correct	6 ms	5120 KB	Output is correct
14	Correct	7 ms	5120 KB	Output is correct
15	Correct	6 ms	4992 KB	Output is correct
16	Correct	6 ms	4992 KB	Output is correct
17	Correct	6 ms	4992 KB	Output is correct
18	Correct	5 ms	4992 KB	Output is correct
19	Correct	6 ms	4992 KB	Output is correct
20	Correct	7 ms	4992 KB	Output is correct
21	Correct	6 ms	4992 KB	Output is correct
22	Correct	6 ms	4992 KB	Output is correct
23	Correct	6 ms	5120 KB	Output is correct
24	Correct	7 ms	5120 KB	Output is correct
25	Correct	7 ms	5120 KB	Output is correct
26	Correct	5 ms	5120 KB	Output is correct
27	Correct	6 ms	5120 KB	Output is correct
28	Correct	5 ms	5120 KB	Output is correct
29	Correct	6 ms	5120 KB	Output is correct
30	Correct	5 ms	4992 KB	Output is correct
31	Correct	6 ms	5120 KB	Output is correct
32	Correct	6 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	4992 KB	Output is correct
36	Correct	6 ms	4992 KB	Output is correct
37	Correct	6 ms	4992 KB	Output is correct
38	Correct	5 ms	4992 KB	Output is correct
39	Correct	5 ms	4992 KB	Output is correct
40	Correct	5 ms	4992 KB	Output is correct
41	Correct	5 ms	4992 KB	Output is correct
42	Correct	5 ms	4992 KB	Output is correct
43	Correct	5 ms	5120 KB	Output is correct
44	Correct	5 ms	4992 KB	Output is correct
45	Correct	6 ms	4992 KB	Output is correct
46	Correct	6 ms	5120 KB	Output is correct
47	Correct	7 ms	4992 KB	Output is correct
48	Correct	6 ms	4992 KB	Output is correct
49	Correct	7 ms	5008 KB	Output is correct
50	Correct	5 ms	4992 KB	Output is correct
51	Correct	6 ms	4992 KB	Output is correct
52	Correct	6 ms	4992 KB	Output is correct
53	Correct	7 ms	4992 KB	Output is correct
54	Correct	7 ms	4992 KB	Output is correct
55	Correct	5 ms	5164 KB	Output is correct
56	Correct	6 ms	5120 KB	Output is correct
57	Correct	7 ms	4992 KB	Output is correct
58	Correct	6 ms	4992 KB	Output is correct
59	Correct	7 ms	4992 KB	Output is correct
60	Correct	6 ms	5120 KB	Output is correct
61	Correct	7 ms	5120 KB	Output is correct
62	Correct	6 ms	5120 KB	Output is correct
63	Correct	7 ms	4992 KB	Output is correct
64	Correct	6 ms	4992 KB	Output is correct
65	Correct	6 ms	5120 KB	Output is correct
66	Correct	6 ms	5120 KB	Output is correct
67	Correct	6 ms	4992 KB	Output is correct
68	Correct	6 ms	4992 KB	Output is correct
69	Correct	6 ms	4992 KB	Output is correct
70	Correct	6 ms	5120 KB	Output is correct
71	Correct	6 ms	5120 KB	Output is correct
72	Correct	5 ms	4992 KB	Output is correct
73	Correct	6 ms	4992 KB	Output is correct
74	Correct	8 ms	5120 KB	Output is correct
75	Correct	6 ms	4992 KB	Output is correct
76	Correct	7 ms	5120 KB	Output is correct
77	Correct	7 ms	5120 KB	Output is correct
78	Correct	7 ms	4980 KB	Output is correct
79	Correct	7 ms	5120 KB	Output is correct
80	Correct	7 ms	5120 KB	Output is correct
81	Correct	7 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	9 ms	5120 KB	Output is correct
85	Correct	7 ms	5120 KB	Output is correct
86	Correct	8 ms	5120 KB	Output is correct
87	Correct	6 ms	5120 KB	Output is correct
88	Correct	6 ms	5120 KB	Output is correct
89	Correct	6 ms	5120 KB	Output is correct
90	Correct	8 ms	5120 KB	Output is correct
91	Correct	6 ms	5120 KB	Output is correct
92	Correct	6 ms	5036 KB	Output is correct
93	Correct	6 ms	5120 KB	Output is correct
94	Correct	8 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	6 ms	5120 KB	Output is correct
99	Correct	40 ms	13800 KB	Output is correct
100	Correct	6 ms	5760 KB	Output is correct
101	Correct	22 ms	8576 KB	Output is correct
102	Correct	35 ms	12152 KB	Output is correct
103	Correct	102 ms	12404 KB	Output is correct
104	Correct	87 ms	10616 KB	Output is correct
105	Correct	86 ms	12840 KB	Output is correct
106	Correct	14 ms	8576 KB	Output is correct
107	Correct	14 ms	8576 KB	Output is correct
108	Correct	115 ms	12660 KB	Output is correct
109	Correct	67 ms	11384 KB	Output is correct
110	Correct	75 ms	11768 KB	Output is correct
111	Correct	7 ms	5888 KB	Output is correct
112	Correct	9 ms	5888 KB	Output is correct
113	Correct	116 ms	15164 KB	Output is correct
114	Correct	37 ms	11644 KB	Output is correct
115	Correct	131 ms	15476 KB	Output is correct
116	Correct	42 ms	8056 KB	Output is correct
117	Correct	10 ms	5760 KB	Output is correct
118	Correct	38 ms	10712 KB	Output is correct
119	Correct	8 ms	6016 KB	Output is correct
120	Correct	89 ms	12788 KB	Output is correct
121	Correct	37 ms	9984 KB	Output is correct
122	Correct	5 ms	5120 KB	Output is correct
123	Correct	9 ms	5760 KB	Output is correct
124	Correct	33 ms	7956 KB	Output is correct
125	Correct	37 ms	9592 KB	Output is correct
126	Correct	12 ms	7296 KB	Output is correct
127	Correct	22 ms	9856 KB	Output is correct
128	Correct	68 ms	11508 KB	Output is correct
129	Correct	42 ms	9748 KB	Output is correct
130	Correct	55 ms	10232 KB	Output is correct
131	Correct	7 ms	5888 KB	Output is correct
132	Correct	7 ms	5888 KB	Output is correct
133	Correct	111 ms	15220 KB	Output is correct
134	Correct	59 ms	15080 KB	Output is correct
135	Correct	28 ms	14964 KB	Output is correct
136	Correct	45 ms	8796 KB	Output is correct
137	Correct	73 ms	11768 KB	Output is correct
138	Correct	23 ms	12928 KB	Output is correct

Submission #106164

Compilation message

Subtask #1 13.0 / 13.0

Subtask #2 20.0 / 20.0

Subtask #3 22.0 / 22.0

Subtask #4 19.0 / 19.0

Subtask #5 26.0 / 26.0

Subtask #1
13.0 / 13.0

Subtask #2
20.0 / 20.0

Subtask #3
22.0 / 22.0

Subtask #4
19.0 / 19.0

Subtask #5
26.0 / 26.0