답안 #63224 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
63224	2018-08-01T06:27:40 Z	김세빈(#1833)	Alternating Current (BOI18_alternating)	C++11	13 / 100	174 ms	18784 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 fff[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, 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);
	}
	
	e = P[x].second; y = -1;
	
	for(i=1; i<=n; i++){
		for(int &t: X[i]) e = max(e, P[t].second);
		for(int &t: Y[i]){
			if(y == -1) y = t;
			else if(P[t].second > P[y].second) y = t;
		}
		
		if(i == e){
			if(y == -1) die();
			ans[y] = 1;
			e = P[y].second;
			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:30:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d", &n, &m);
  ~~~~~^~~~~~~~~~~~~~~~
alternating.cpp:33:8: 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

#	결과	실행 시간	메모리	Grader output
1	Correct	11 ms	9848 KB	Output is correct
2	Correct	11 ms	9924 KB	Output is correct
3	Correct	10 ms	9924 KB	Output is correct
4	Correct	11 ms	9924 KB	Output is correct
5	Correct	11 ms	9944 KB	Output is correct
6	Correct	11 ms	9988 KB	Output is correct
7	Correct	11 ms	9988 KB	Output is correct
8	Correct	12 ms	9988 KB	Output is correct
9	Correct	11 ms	10188 KB	Output is correct
10	Correct	12 ms	10188 KB	Output is correct
11	Correct	11 ms	10188 KB	Output is correct
12	Correct	11 ms	10188 KB	Output is correct
13	Correct	11 ms	10188 KB	Output is correct
14	Correct	12 ms	10188 KB	Output is correct
15	Correct	12 ms	10188 KB	Output is correct
16	Correct	13 ms	10188 KB	Output is correct
17	Correct	12 ms	10188 KB	Output is correct
18	Correct	12 ms	10196 KB	Output is correct
19	Correct	13 ms	10196 KB	Output is correct
20	Correct	11 ms	10196 KB	Output is correct
21	Correct	11 ms	10196 KB	Output is correct
22	Correct	11 ms	10196 KB	Output is correct
23	Correct	14 ms	10196 KB	Output is correct
24	Correct	11 ms	10196 KB	Output is correct
25	Correct	12 ms	10196 KB	Output is correct
26	Correct	12 ms	10196 KB	Output is correct
27	Correct	12 ms	10216 KB	Output is correct
28	Correct	12 ms	10216 KB	Output is correct
29	Correct	12 ms	10216 KB	Output is correct
30	Correct	12 ms	10216 KB	Output is correct
31	Correct	12 ms	10216 KB	Output is correct
32	Correct	13 ms	10216 KB	Output is correct
33	Correct	12 ms	10216 KB	Output is correct
34	Correct	11 ms	10216 KB	Output is correct
35	Correct	14 ms	10216 KB	Output is correct
36	Correct	13 ms	10216 KB	Output is correct
37	Correct	12 ms	10216 KB	Output is correct
38	Correct	13 ms	10216 KB	Output is correct
39	Correct	14 ms	10216 KB	Output is correct
40	Correct	13 ms	10216 KB	Output is correct

Subtask #2
0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	11 ms	9848 KB	Output is correct
2	Correct	11 ms	9924 KB	Output is correct
3	Correct	10 ms	9924 KB	Output is correct
4	Correct	11 ms	9924 KB	Output is correct
5	Correct	11 ms	9944 KB	Output is correct
6	Correct	11 ms	9988 KB	Output is correct
7	Correct	11 ms	9988 KB	Output is correct
8	Correct	12 ms	9988 KB	Output is correct
9	Correct	11 ms	10188 KB	Output is correct
10	Correct	12 ms	10188 KB	Output is correct
11	Correct	11 ms	10188 KB	Output is correct
12	Correct	11 ms	10188 KB	Output is correct
13	Correct	11 ms	10188 KB	Output is correct
14	Correct	12 ms	10188 KB	Output is correct
15	Correct	12 ms	10188 KB	Output is correct
16	Correct	13 ms	10188 KB	Output is correct
17	Correct	12 ms	10188 KB	Output is correct
18	Correct	12 ms	10196 KB	Output is correct
19	Correct	13 ms	10196 KB	Output is correct
20	Correct	11 ms	10196 KB	Output is correct
21	Correct	11 ms	10196 KB	Output is correct
22	Correct	11 ms	10196 KB	Output is correct
23	Correct	14 ms	10196 KB	Output is correct
24	Correct	11 ms	10196 KB	Output is correct
25	Correct	12 ms	10196 KB	Output is correct
26	Correct	12 ms	10196 KB	Output is correct
27	Correct	12 ms	10216 KB	Output is correct
28	Correct	12 ms	10216 KB	Output is correct
29	Correct	12 ms	10216 KB	Output is correct
30	Correct	12 ms	10216 KB	Output is correct
31	Correct	12 ms	10216 KB	Output is correct
32	Correct	13 ms	10216 KB	Output is correct
33	Correct	12 ms	10216 KB	Output is correct
34	Correct	11 ms	10216 KB	Output is correct
35	Correct	14 ms	10216 KB	Output is correct
36	Correct	13 ms	10216 KB	Output is correct
37	Correct	12 ms	10216 KB	Output is correct
38	Correct	13 ms	10216 KB	Output is correct
39	Correct	14 ms	10216 KB	Output is correct
40	Correct	13 ms	10216 KB	Output is correct
41	Correct	11 ms	10216 KB	Output is correct
42	Correct	14 ms	10216 KB	Output is correct
43	Correct	12 ms	10216 KB	Output is correct
44	Correct	11 ms	10216 KB	Output is correct
45	Correct	11 ms	10216 KB	Output is correct
46	Correct	11 ms	10216 KB	Output is correct
47	Correct	13 ms	10216 KB	Output is correct
48	Correct	13 ms	10216 KB	Output is correct
49	Correct	13 ms	10216 KB	Output is correct
50	Correct	11 ms	10216 KB	Output is correct
51	Correct	13 ms	10216 KB	Output is correct
52	Correct	10 ms	10216 KB	Output is correct
53	Correct	12 ms	10216 KB	Output is correct
54	Correct	11 ms	10216 KB	Output is correct
55	Correct	11 ms	10216 KB	Output is correct
56	Correct	11 ms	10216 KB	Output is correct
57	Correct	11 ms	10216 KB	Output is correct
58	Correct	11 ms	10216 KB	Output is correct
59	Correct	14 ms	10216 KB	Output is correct
60	Correct	11 ms	10216 KB	Output is correct
61	Correct	12 ms	10216 KB	Output is correct
62	Incorrect	11 ms	10216 KB	no wires in direction 0 between segments 59 and 59
63	Halted	0 ms	0 KB	-

Subtask #3
0 / 22.0

#	결과	실행 시간	메모리	Grader output
1	Correct	11 ms	9848 KB	Output is correct
2	Correct	11 ms	9924 KB	Output is correct
3	Correct	10 ms	9924 KB	Output is correct
4	Correct	11 ms	9924 KB	Output is correct
5	Correct	11 ms	9944 KB	Output is correct
6	Correct	11 ms	9988 KB	Output is correct
7	Correct	11 ms	9988 KB	Output is correct
8	Correct	12 ms	9988 KB	Output is correct
9	Correct	11 ms	10188 KB	Output is correct
10	Correct	12 ms	10188 KB	Output is correct
11	Correct	11 ms	10188 KB	Output is correct
12	Correct	11 ms	10188 KB	Output is correct
13	Correct	11 ms	10188 KB	Output is correct
14	Correct	12 ms	10188 KB	Output is correct
15	Correct	12 ms	10188 KB	Output is correct
16	Correct	13 ms	10188 KB	Output is correct
17	Correct	12 ms	10188 KB	Output is correct
18	Correct	12 ms	10196 KB	Output is correct
19	Correct	13 ms	10196 KB	Output is correct
20	Correct	11 ms	10196 KB	Output is correct
21	Correct	11 ms	10196 KB	Output is correct
22	Correct	11 ms	10196 KB	Output is correct
23	Correct	14 ms	10196 KB	Output is correct
24	Correct	11 ms	10196 KB	Output is correct
25	Correct	12 ms	10196 KB	Output is correct
26	Correct	12 ms	10196 KB	Output is correct
27	Correct	12 ms	10216 KB	Output is correct
28	Correct	12 ms	10216 KB	Output is correct
29	Correct	12 ms	10216 KB	Output is correct
30	Correct	12 ms	10216 KB	Output is correct
31	Correct	12 ms	10216 KB	Output is correct
32	Correct	13 ms	10216 KB	Output is correct
33	Correct	12 ms	10216 KB	Output is correct
34	Correct	11 ms	10216 KB	Output is correct
35	Correct	14 ms	10216 KB	Output is correct
36	Correct	13 ms	10216 KB	Output is correct
37	Correct	12 ms	10216 KB	Output is correct
38	Correct	13 ms	10216 KB	Output is correct
39	Correct	14 ms	10216 KB	Output is correct
40	Correct	13 ms	10216 KB	Output is correct
41	Correct	11 ms	10216 KB	Output is correct
42	Correct	14 ms	10216 KB	Output is correct
43	Correct	12 ms	10216 KB	Output is correct
44	Correct	11 ms	10216 KB	Output is correct
45	Correct	11 ms	10216 KB	Output is correct
46	Correct	11 ms	10216 KB	Output is correct
47	Correct	13 ms	10216 KB	Output is correct
48	Correct	13 ms	10216 KB	Output is correct
49	Correct	13 ms	10216 KB	Output is correct
50	Correct	11 ms	10216 KB	Output is correct
51	Correct	13 ms	10216 KB	Output is correct
52	Correct	10 ms	10216 KB	Output is correct
53	Correct	12 ms	10216 KB	Output is correct
54	Correct	11 ms	10216 KB	Output is correct
55	Correct	11 ms	10216 KB	Output is correct
56	Correct	11 ms	10216 KB	Output is correct
57	Correct	11 ms	10216 KB	Output is correct
58	Correct	11 ms	10216 KB	Output is correct
59	Correct	14 ms	10216 KB	Output is correct
60	Correct	11 ms	10216 KB	Output is correct
61	Correct	12 ms	10216 KB	Output is correct
62	Incorrect	11 ms	10216 KB	no wires in direction 0 between segments 59 and 59
63	Halted	0 ms	0 KB	-

Subtask #4
0 / 19.0

#	결과	실행 시간	메모리	Grader output
1	Correct	132 ms	17680 KB	Output is correct
2	Correct	16 ms	17680 KB	Output is correct
3	Correct	37 ms	17680 KB	Output is correct
4	Correct	74 ms	17680 KB	Output is correct
5	Correct	174 ms	18456 KB	Output is correct
6	Correct	87 ms	18456 KB	Output is correct
7	Correct	154 ms	18456 KB	Output is correct
8	Correct	19 ms	18456 KB	Output is correct
9	Correct	16 ms	18456 KB	Output is correct
10	Correct	164 ms	18784 KB	Output is correct
11	Correct	150 ms	18784 KB	Output is correct
12	Correct	132 ms	18784 KB	Output is correct
13	Incorrect	15 ms	18784 KB	no wires in direction 0 between segments 100000 and 100000
14	Halted	0 ms	0 KB	-

Subtask #5
0 / 26.0

#	결과	실행 시간	메모리	Grader output
1	Correct	11 ms	9848 KB	Output is correct
2	Correct	11 ms	9924 KB	Output is correct
3	Correct	10 ms	9924 KB	Output is correct
4	Correct	11 ms	9924 KB	Output is correct
5	Correct	11 ms	9944 KB	Output is correct
6	Correct	11 ms	9988 KB	Output is correct
7	Correct	11 ms	9988 KB	Output is correct
8	Correct	12 ms	9988 KB	Output is correct
9	Correct	11 ms	10188 KB	Output is correct
10	Correct	12 ms	10188 KB	Output is correct
11	Correct	11 ms	10188 KB	Output is correct
12	Correct	11 ms	10188 KB	Output is correct
13	Correct	11 ms	10188 KB	Output is correct
14	Correct	12 ms	10188 KB	Output is correct
15	Correct	12 ms	10188 KB	Output is correct
16	Correct	13 ms	10188 KB	Output is correct
17	Correct	12 ms	10188 KB	Output is correct
18	Correct	12 ms	10196 KB	Output is correct
19	Correct	13 ms	10196 KB	Output is correct
20	Correct	11 ms	10196 KB	Output is correct
21	Correct	11 ms	10196 KB	Output is correct
22	Correct	11 ms	10196 KB	Output is correct
23	Correct	14 ms	10196 KB	Output is correct
24	Correct	11 ms	10196 KB	Output is correct
25	Correct	12 ms	10196 KB	Output is correct
26	Correct	12 ms	10196 KB	Output is correct
27	Correct	12 ms	10216 KB	Output is correct
28	Correct	12 ms	10216 KB	Output is correct
29	Correct	12 ms	10216 KB	Output is correct
30	Correct	12 ms	10216 KB	Output is correct
31	Correct	12 ms	10216 KB	Output is correct
32	Correct	13 ms	10216 KB	Output is correct
33	Correct	12 ms	10216 KB	Output is correct
34	Correct	11 ms	10216 KB	Output is correct
35	Correct	14 ms	10216 KB	Output is correct
36	Correct	13 ms	10216 KB	Output is correct
37	Correct	12 ms	10216 KB	Output is correct
38	Correct	13 ms	10216 KB	Output is correct
39	Correct	14 ms	10216 KB	Output is correct
40	Correct	13 ms	10216 KB	Output is correct
41	Correct	11 ms	10216 KB	Output is correct
42	Correct	14 ms	10216 KB	Output is correct
43	Correct	12 ms	10216 KB	Output is correct
44	Correct	11 ms	10216 KB	Output is correct
45	Correct	11 ms	10216 KB	Output is correct
46	Correct	11 ms	10216 KB	Output is correct
47	Correct	13 ms	10216 KB	Output is correct
48	Correct	13 ms	10216 KB	Output is correct
49	Correct	13 ms	10216 KB	Output is correct
50	Correct	11 ms	10216 KB	Output is correct
51	Correct	13 ms	10216 KB	Output is correct
52	Correct	10 ms	10216 KB	Output is correct
53	Correct	12 ms	10216 KB	Output is correct
54	Correct	11 ms	10216 KB	Output is correct
55	Correct	11 ms	10216 KB	Output is correct
56	Correct	11 ms	10216 KB	Output is correct
57	Correct	11 ms	10216 KB	Output is correct
58	Correct	11 ms	10216 KB	Output is correct
59	Correct	14 ms	10216 KB	Output is correct
60	Correct	11 ms	10216 KB	Output is correct
61	Correct	12 ms	10216 KB	Output is correct
62	Incorrect	11 ms	10216 KB	no wires in direction 0 between segments 59 and 59
63	Halted	0 ms	0 KB	-

답안 #63224

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