Submission #63251

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
63251	2018-08-01T07:04:03 Z	김세빈(#1833)	Alternating Current (BOI18_alternating)	C++11	55 / 100	3000 ms	18972 KB

alternating

#include <bits/stdc++.h>

using namespace std;

typedef pair <int, int> pii;

vector <int> L[101010], V[101010];
vector <int> X[101010], Y[101010];
set <int> S;
pii P[101010];
int chk[101010], ans[101010];
int n, m;

void die() { printf("impossible\n"); exit(0); }

void dfs(int p, int c)
{
	chk[p] = 2; ans[p] = c;
	for(int &t: V[p]){
		if(chk[t] == 1) dfs(t, !c);
		else if(ans[t] == ans[p]) die();
	}
}

int main()
{
	int i, j, s, e, x, y, a, b;
	
	scanf("%d%d", &n, &m);
	
	for(i=1; i<=m; i++){
		scanf("%d%d", &a, &b);
		b ++; if(b > n) b -= n;
		P[i] = pii(a, b);
		if(a < b){
			L[a].push_back(i);
			L[b].push_back(-i);
		}
		else{
			L[1].push_back(i);
			L[b].push_back(-i);
			L[a].push_back(i);
		}
	}
	
	for(i=1; i<=n; i++){
		for(int &t: L[i]){
			if(t > 0) S.insert(t);
			else S.erase(-t);
		}
		
		if(S.size() == 2){
			a = *S.begin(); b = *next(S.begin());
			V[a].push_back(b);
			V[b].push_back(a);
			chk[a] = 1; chk[b] = 1;
		}
		else if(S.size() == 1) die();
	}
	
	for(i=1; i<=m; i++){
		if(chk[i] == 1) dfs(i, 0);
	}
	
	x = 1;
	
	for(i=1; i<=m; i++){
		if(chk[i]){
			if(ans[i] == 1) x = i;
		}
	}
	
	ans[x] = 1;
	s = P[x].first;
	
	for(i=1; i<=m; i++){
		P[i].first = (P[i].first - s + n) % n + 1;
		P[i].second = (P[i].second - s + n) % n + 1;
		if(P[i].first >= P[i].second) P[i].second += n;
		
		if(chk[i] && ans[i] == 1) X[P[i].first].push_back(i);
		else if(!chk[i]) Y[P[i].first].push_back(i);
	}
	
	s = 1; e = P[x].second; y = -1;
	
	for(i=1; i<=n; i++){
		for(int &t: X[i]) e = max(e, P[t].second);
		
		if(i == e){
			y = -1;
			for(j=s; j<=e; j++){
				for(int &t: Y[j]){
					if(P[t].second > e) y = t;
				}
			}
			if(y == -1) die();
			
			ans[y] = 1;
			e = P[y].second;
			i = P[y].first;
			y = -1;
		}
	}
	
	for(i=1; i<=m; i++) printf("%d", ans[i]);
	printf("\n");
	
	return 0;
}

Compilation message

alternating.cpp: In function 'int main()':
alternating.cpp:29:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~
alternating.cpp:32:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", &a, &b);
   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
13.0 / 13.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	11 ms	9848 KB	Output is correct
2	Correct	13 ms	9848 KB	Output is correct
3	Correct	13 ms	9908 KB	Output is correct
4	Correct	13 ms	10088 KB	Output is correct
5	Correct	14 ms	10088 KB	Output is correct
6	Correct	15 ms	10088 KB	Output is correct
7	Correct	11 ms	10088 KB	Output is correct
8	Correct	13 ms	10092 KB	Output is correct
9	Correct	11 ms	10092 KB	Output is correct
10	Correct	13 ms	10092 KB	Output is correct
11	Correct	11 ms	10092 KB	Output is correct
12	Correct	12 ms	10200 KB	Output is correct
13	Correct	13 ms	10200 KB	Output is correct
14	Correct	11 ms	10200 KB	Output is correct
15	Correct	11 ms	10200 KB	Output is correct
16	Correct	11 ms	10200 KB	Output is correct
17	Correct	12 ms	10200 KB	Output is correct
18	Correct	13 ms	10200 KB	Output is correct
19	Correct	11 ms	10200 KB	Output is correct
20	Correct	13 ms	10200 KB	Output is correct
21	Correct	13 ms	10200 KB	Output is correct
22	Correct	13 ms	10200 KB	Output is correct
23	Correct	13 ms	10200 KB	Output is correct
24	Correct	10 ms	10324 KB	Output is correct
25	Correct	14 ms	10324 KB	Output is correct
26	Correct	14 ms	10324 KB	Output is correct
27	Correct	14 ms	10324 KB	Output is correct
28	Correct	15 ms	10324 KB	Output is correct
29	Correct	12 ms	10324 KB	Output is correct
30	Correct	15 ms	10324 KB	Output is correct
31	Correct	10 ms	10324 KB	Output is correct
32	Correct	12 ms	10324 KB	Output is correct
33	Correct	13 ms	10324 KB	Output is correct
34	Correct	13 ms	10324 KB	Output is correct
35	Correct	11 ms	10324 KB	Output is correct
36	Correct	11 ms	10324 KB	Output is correct
37	Correct	17 ms	10324 KB	Output is correct
38	Correct	13 ms	10324 KB	Output is correct
39	Correct	11 ms	10324 KB	Output is correct
40	Correct	11 ms	10324 KB	Output is correct

Subtask #2
20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	11 ms	9848 KB	Output is correct
2	Correct	13 ms	9848 KB	Output is correct
3	Correct	13 ms	9908 KB	Output is correct
4	Correct	13 ms	10088 KB	Output is correct
5	Correct	14 ms	10088 KB	Output is correct
6	Correct	15 ms	10088 KB	Output is correct
7	Correct	11 ms	10088 KB	Output is correct
8	Correct	13 ms	10092 KB	Output is correct
9	Correct	11 ms	10092 KB	Output is correct
10	Correct	13 ms	10092 KB	Output is correct
11	Correct	11 ms	10092 KB	Output is correct
12	Correct	12 ms	10200 KB	Output is correct
13	Correct	13 ms	10200 KB	Output is correct
14	Correct	11 ms	10200 KB	Output is correct
15	Correct	11 ms	10200 KB	Output is correct
16	Correct	11 ms	10200 KB	Output is correct
17	Correct	12 ms	10200 KB	Output is correct
18	Correct	13 ms	10200 KB	Output is correct
19	Correct	11 ms	10200 KB	Output is correct
20	Correct	13 ms	10200 KB	Output is correct
21	Correct	13 ms	10200 KB	Output is correct
22	Correct	13 ms	10200 KB	Output is correct
23	Correct	13 ms	10200 KB	Output is correct
24	Correct	10 ms	10324 KB	Output is correct
25	Correct	14 ms	10324 KB	Output is correct
26	Correct	14 ms	10324 KB	Output is correct
27	Correct	14 ms	10324 KB	Output is correct
28	Correct	15 ms	10324 KB	Output is correct
29	Correct	12 ms	10324 KB	Output is correct
30	Correct	15 ms	10324 KB	Output is correct
31	Correct	10 ms	10324 KB	Output is correct
32	Correct	12 ms	10324 KB	Output is correct
33	Correct	13 ms	10324 KB	Output is correct
34	Correct	13 ms	10324 KB	Output is correct
35	Correct	11 ms	10324 KB	Output is correct
36	Correct	11 ms	10324 KB	Output is correct
37	Correct	17 ms	10324 KB	Output is correct
38	Correct	13 ms	10324 KB	Output is correct
39	Correct	11 ms	10324 KB	Output is correct
40	Correct	11 ms	10324 KB	Output is correct
41	Correct	12 ms	10324 KB	Output is correct
42	Correct	13 ms	10324 KB	Output is correct
43	Correct	14 ms	10324 KB	Output is correct
44	Correct	13 ms	10324 KB	Output is correct
45	Correct	12 ms	10324 KB	Output is correct
46	Correct	11 ms	10324 KB	Output is correct
47	Correct	12 ms	10324 KB	Output is correct
48	Correct	12 ms	10324 KB	Output is correct
49	Correct	10 ms	10324 KB	Output is correct
50	Correct	13 ms	10324 KB	Output is correct
51	Correct	11 ms	10324 KB	Output is correct
52	Correct	11 ms	10324 KB	Output is correct
53	Correct	13 ms	10324 KB	Output is correct
54	Correct	11 ms	10324 KB	Output is correct
55	Correct	11 ms	10324 KB	Output is correct
56	Correct	13 ms	10324 KB	Output is correct
57	Correct	11 ms	10324 KB	Output is correct
58	Correct	13 ms	10324 KB	Output is correct
59	Correct	11 ms	10324 KB	Output is correct
60	Correct	14 ms	10324 KB	Output is correct
61	Correct	12 ms	10324 KB	Output is correct
62	Correct	13 ms	10324 KB	Output is correct
63	Correct	13 ms	10324 KB	Output is correct
64	Correct	12 ms	10324 KB	Output is correct
65	Correct	13 ms	10324 KB	Output is correct
66	Correct	11 ms	10324 KB	Output is correct
67	Correct	10 ms	10324 KB	Output is correct
68	Correct	12 ms	10324 KB	Output is correct
69	Correct	12 ms	10324 KB	Output is correct

Subtask #3
22.0 / 22.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	11 ms	9848 KB	Output is correct
2	Correct	13 ms	9848 KB	Output is correct
3	Correct	13 ms	9908 KB	Output is correct
4	Correct	13 ms	10088 KB	Output is correct
5	Correct	14 ms	10088 KB	Output is correct
6	Correct	15 ms	10088 KB	Output is correct
7	Correct	11 ms	10088 KB	Output is correct
8	Correct	13 ms	10092 KB	Output is correct
9	Correct	11 ms	10092 KB	Output is correct
10	Correct	13 ms	10092 KB	Output is correct
11	Correct	11 ms	10092 KB	Output is correct
12	Correct	12 ms	10200 KB	Output is correct
13	Correct	13 ms	10200 KB	Output is correct
14	Correct	11 ms	10200 KB	Output is correct
15	Correct	11 ms	10200 KB	Output is correct
16	Correct	11 ms	10200 KB	Output is correct
17	Correct	12 ms	10200 KB	Output is correct
18	Correct	13 ms	10200 KB	Output is correct
19	Correct	11 ms	10200 KB	Output is correct
20	Correct	13 ms	10200 KB	Output is correct
21	Correct	13 ms	10200 KB	Output is correct
22	Correct	13 ms	10200 KB	Output is correct
23	Correct	13 ms	10200 KB	Output is correct
24	Correct	10 ms	10324 KB	Output is correct
25	Correct	14 ms	10324 KB	Output is correct
26	Correct	14 ms	10324 KB	Output is correct
27	Correct	14 ms	10324 KB	Output is correct
28	Correct	15 ms	10324 KB	Output is correct
29	Correct	12 ms	10324 KB	Output is correct
30	Correct	15 ms	10324 KB	Output is correct
31	Correct	10 ms	10324 KB	Output is correct
32	Correct	12 ms	10324 KB	Output is correct
33	Correct	13 ms	10324 KB	Output is correct
34	Correct	13 ms	10324 KB	Output is correct
35	Correct	11 ms	10324 KB	Output is correct
36	Correct	11 ms	10324 KB	Output is correct
37	Correct	17 ms	10324 KB	Output is correct
38	Correct	13 ms	10324 KB	Output is correct
39	Correct	11 ms	10324 KB	Output is correct
40	Correct	11 ms	10324 KB	Output is correct
41	Correct	12 ms	10324 KB	Output is correct
42	Correct	13 ms	10324 KB	Output is correct
43	Correct	14 ms	10324 KB	Output is correct
44	Correct	13 ms	10324 KB	Output is correct
45	Correct	12 ms	10324 KB	Output is correct
46	Correct	11 ms	10324 KB	Output is correct
47	Correct	12 ms	10324 KB	Output is correct
48	Correct	12 ms	10324 KB	Output is correct
49	Correct	10 ms	10324 KB	Output is correct
50	Correct	13 ms	10324 KB	Output is correct
51	Correct	11 ms	10324 KB	Output is correct
52	Correct	11 ms	10324 KB	Output is correct
53	Correct	13 ms	10324 KB	Output is correct
54	Correct	11 ms	10324 KB	Output is correct
55	Correct	11 ms	10324 KB	Output is correct
56	Correct	13 ms	10324 KB	Output is correct
57	Correct	11 ms	10324 KB	Output is correct
58	Correct	13 ms	10324 KB	Output is correct
59	Correct	11 ms	10324 KB	Output is correct
60	Correct	14 ms	10324 KB	Output is correct
61	Correct	12 ms	10324 KB	Output is correct
62	Correct	13 ms	10324 KB	Output is correct
63	Correct	13 ms	10324 KB	Output is correct
64	Correct	12 ms	10324 KB	Output is correct
65	Correct	13 ms	10324 KB	Output is correct
66	Correct	11 ms	10324 KB	Output is correct
67	Correct	10 ms	10324 KB	Output is correct
68	Correct	12 ms	10324 KB	Output is correct
69	Correct	12 ms	10324 KB	Output is correct
70	Correct	13 ms	10324 KB	Output is correct
71	Correct	17 ms	10324 KB	Output is correct
72	Correct	10 ms	10324 KB	Output is correct
73	Correct	10 ms	10324 KB	Output is correct
74	Correct	12 ms	10324 KB	Output is correct
75	Correct	13 ms	10324 KB	Output is correct
76	Correct	11 ms	10324 KB	Output is correct
77	Correct	13 ms	10324 KB	Output is correct
78	Correct	11 ms	10324 KB	Output is correct
79	Correct	11 ms	10324 KB	Output is correct
80	Correct	11 ms	10324 KB	Output is correct
81	Correct	13 ms	10324 KB	Output is correct
82	Correct	12 ms	10324 KB	Output is correct
83	Correct	13 ms	10324 KB	Output is correct
84	Correct	11 ms	10324 KB	Output is correct
85	Correct	11 ms	10324 KB	Output is correct
86	Correct	12 ms	10324 KB	Output is correct
87	Correct	18 ms	10324 KB	Output is correct
88	Correct	12 ms	10324 KB	Output is correct
89	Correct	13 ms	10324 KB	Output is correct
90	Correct	14 ms	10324 KB	Output is correct
91	Correct	11 ms	10324 KB	Output is correct
92	Correct	14 ms	10324 KB	Output is correct
93	Correct	13 ms	10324 KB	Output is correct
94	Correct	14 ms	10324 KB	Output is correct
95	Correct	11 ms	10324 KB	Output is correct
96	Correct	12 ms	10324 KB	Output is correct
97	Correct	12 ms	10324 KB	Output is correct
98	Correct	13 ms	10324 KB	Output is correct

Subtask #4
0 / 19.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	150 ms	17940 KB	Output is correct
2	Correct	15 ms	17940 KB	Output is correct
3	Correct	35 ms	17940 KB	Output is correct
4	Correct	79 ms	17940 KB	Output is correct
5	Correct	151 ms	18444 KB	Output is correct
6	Correct	87 ms	18444 KB	Output is correct
7	Correct	166 ms	18444 KB	Output is correct
8	Correct	19 ms	18444 KB	Output is correct
9	Correct	14 ms	18444 KB	Output is correct
10	Correct	158 ms	18972 KB	Output is correct
11	Correct	123 ms	18972 KB	Output is correct
12	Correct	124 ms	18972 KB	Output is correct
13	Correct	13 ms	18972 KB	Output is correct
14	Correct	13 ms	18972 KB	Output is correct
15	Execution timed out	3094 ms	18972 KB	Time limit exceeded
16	Halted	0 ms	0 KB	-

Subtask #5
0 / 26.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	11 ms	9848 KB	Output is correct
2	Correct	13 ms	9848 KB	Output is correct
3	Correct	13 ms	9908 KB	Output is correct
4	Correct	13 ms	10088 KB	Output is correct
5	Correct	14 ms	10088 KB	Output is correct
6	Correct	15 ms	10088 KB	Output is correct
7	Correct	11 ms	10088 KB	Output is correct
8	Correct	13 ms	10092 KB	Output is correct
9	Correct	11 ms	10092 KB	Output is correct
10	Correct	13 ms	10092 KB	Output is correct
11	Correct	11 ms	10092 KB	Output is correct
12	Correct	12 ms	10200 KB	Output is correct
13	Correct	13 ms	10200 KB	Output is correct
14	Correct	11 ms	10200 KB	Output is correct
15	Correct	11 ms	10200 KB	Output is correct
16	Correct	11 ms	10200 KB	Output is correct
17	Correct	12 ms	10200 KB	Output is correct
18	Correct	13 ms	10200 KB	Output is correct
19	Correct	11 ms	10200 KB	Output is correct
20	Correct	13 ms	10200 KB	Output is correct
21	Correct	13 ms	10200 KB	Output is correct
22	Correct	13 ms	10200 KB	Output is correct
23	Correct	13 ms	10200 KB	Output is correct
24	Correct	10 ms	10324 KB	Output is correct
25	Correct	14 ms	10324 KB	Output is correct
26	Correct	14 ms	10324 KB	Output is correct
27	Correct	14 ms	10324 KB	Output is correct
28	Correct	15 ms	10324 KB	Output is correct
29	Correct	12 ms	10324 KB	Output is correct
30	Correct	15 ms	10324 KB	Output is correct
31	Correct	10 ms	10324 KB	Output is correct
32	Correct	12 ms	10324 KB	Output is correct
33	Correct	13 ms	10324 KB	Output is correct
34	Correct	13 ms	10324 KB	Output is correct
35	Correct	11 ms	10324 KB	Output is correct
36	Correct	11 ms	10324 KB	Output is correct
37	Correct	17 ms	10324 KB	Output is correct
38	Correct	13 ms	10324 KB	Output is correct
39	Correct	11 ms	10324 KB	Output is correct
40	Correct	11 ms	10324 KB	Output is correct
41	Correct	12 ms	10324 KB	Output is correct
42	Correct	13 ms	10324 KB	Output is correct
43	Correct	14 ms	10324 KB	Output is correct
44	Correct	13 ms	10324 KB	Output is correct
45	Correct	12 ms	10324 KB	Output is correct
46	Correct	11 ms	10324 KB	Output is correct
47	Correct	12 ms	10324 KB	Output is correct
48	Correct	12 ms	10324 KB	Output is correct
49	Correct	10 ms	10324 KB	Output is correct
50	Correct	13 ms	10324 KB	Output is correct
51	Correct	11 ms	10324 KB	Output is correct
52	Correct	11 ms	10324 KB	Output is correct
53	Correct	13 ms	10324 KB	Output is correct
54	Correct	11 ms	10324 KB	Output is correct
55	Correct	11 ms	10324 KB	Output is correct
56	Correct	13 ms	10324 KB	Output is correct
57	Correct	11 ms	10324 KB	Output is correct
58	Correct	13 ms	10324 KB	Output is correct
59	Correct	11 ms	10324 KB	Output is correct
60	Correct	14 ms	10324 KB	Output is correct
61	Correct	12 ms	10324 KB	Output is correct
62	Correct	13 ms	10324 KB	Output is correct
63	Correct	13 ms	10324 KB	Output is correct
64	Correct	12 ms	10324 KB	Output is correct
65	Correct	13 ms	10324 KB	Output is correct
66	Correct	11 ms	10324 KB	Output is correct
67	Correct	10 ms	10324 KB	Output is correct
68	Correct	12 ms	10324 KB	Output is correct
69	Correct	12 ms	10324 KB	Output is correct
70	Correct	13 ms	10324 KB	Output is correct
71	Correct	17 ms	10324 KB	Output is correct
72	Correct	10 ms	10324 KB	Output is correct
73	Correct	10 ms	10324 KB	Output is correct
74	Correct	12 ms	10324 KB	Output is correct
75	Correct	13 ms	10324 KB	Output is correct
76	Correct	11 ms	10324 KB	Output is correct
77	Correct	13 ms	10324 KB	Output is correct
78	Correct	11 ms	10324 KB	Output is correct
79	Correct	11 ms	10324 KB	Output is correct
80	Correct	11 ms	10324 KB	Output is correct
81	Correct	13 ms	10324 KB	Output is correct
82	Correct	12 ms	10324 KB	Output is correct
83	Correct	13 ms	10324 KB	Output is correct
84	Correct	11 ms	10324 KB	Output is correct
85	Correct	11 ms	10324 KB	Output is correct
86	Correct	12 ms	10324 KB	Output is correct
87	Correct	18 ms	10324 KB	Output is correct
88	Correct	12 ms	10324 KB	Output is correct
89	Correct	13 ms	10324 KB	Output is correct
90	Correct	14 ms	10324 KB	Output is correct
91	Correct	11 ms	10324 KB	Output is correct
92	Correct	14 ms	10324 KB	Output is correct
93	Correct	13 ms	10324 KB	Output is correct
94	Correct	14 ms	10324 KB	Output is correct
95	Correct	11 ms	10324 KB	Output is correct
96	Correct	12 ms	10324 KB	Output is correct
97	Correct	12 ms	10324 KB	Output is correct
98	Correct	13 ms	10324 KB	Output is correct
99	Correct	150 ms	17940 KB	Output is correct
100	Correct	15 ms	17940 KB	Output is correct
101	Correct	35 ms	17940 KB	Output is correct
102	Correct	79 ms	17940 KB	Output is correct
103	Correct	151 ms	18444 KB	Output is correct
104	Correct	87 ms	18444 KB	Output is correct
105	Correct	166 ms	18444 KB	Output is correct
106	Correct	19 ms	18444 KB	Output is correct
107	Correct	14 ms	18444 KB	Output is correct
108	Correct	158 ms	18972 KB	Output is correct
109	Correct	123 ms	18972 KB	Output is correct
110	Correct	124 ms	18972 KB	Output is correct
111	Correct	13 ms	18972 KB	Output is correct
112	Correct	13 ms	18972 KB	Output is correct
113	Execution timed out	3094 ms	18972 KB	Time limit exceeded
114	Halted	0 ms	0 KB	-

Submission #63251

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