답안 #63233 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
63233	2018-08-01T06:44:09 Z	김세빈(#1833)	Alternating Current (BOI18_alternating)	C++11	13 / 100	178 ms	18444 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]) 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	10 ms	9848 KB	Output is correct
2	Correct	12 ms	9848 KB	Output is correct
3	Correct	10 ms	9884 KB	Output is correct
4	Correct	12 ms	9992 KB	Output is correct
5	Correct	10 ms	9992 KB	Output is correct
6	Correct	10 ms	9992 KB	Output is correct
7	Correct	12 ms	9992 KB	Output is correct
8	Correct	11 ms	10096 KB	Output is correct
9	Correct	11 ms	10096 KB	Output is correct
10	Correct	11 ms	10096 KB	Output is correct
11	Correct	10 ms	10096 KB	Output is correct
12	Correct	11 ms	10096 KB	Output is correct
13	Correct	12 ms	10096 KB	Output is correct
14	Correct	14 ms	10096 KB	Output is correct
15	Correct	12 ms	10096 KB	Output is correct
16	Correct	13 ms	10096 KB	Output is correct
17	Correct	12 ms	10096 KB	Output is correct
18	Correct	12 ms	10096 KB	Output is correct
19	Correct	11 ms	10096 KB	Output is correct
20	Correct	12 ms	10096 KB	Output is correct
21	Correct	12 ms	10096 KB	Output is correct
22	Correct	10 ms	10096 KB	Output is correct
23	Correct	12 ms	10096 KB	Output is correct
24	Correct	11 ms	10096 KB	Output is correct
25	Correct	12 ms	10096 KB	Output is correct
26	Correct	11 ms	10096 KB	Output is correct
27	Correct	11 ms	10096 KB	Output is correct
28	Correct	11 ms	10096 KB	Output is correct
29	Correct	12 ms	10096 KB	Output is correct
30	Correct	10 ms	10096 KB	Output is correct
31	Correct	14 ms	10096 KB	Output is correct
32	Correct	13 ms	10096 KB	Output is correct
33	Correct	12 ms	10096 KB	Output is correct
34	Correct	10 ms	10096 KB	Output is correct
35	Correct	12 ms	10096 KB	Output is correct
36	Correct	11 ms	10096 KB	Output is correct
37	Correct	12 ms	10096 KB	Output is correct
38	Correct	13 ms	10096 KB	Output is correct
39	Correct	9 ms	10096 KB	Output is correct
40	Correct	13 ms	10096 KB	Output is correct

Subtask #2
0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	10 ms	9848 KB	Output is correct
2	Correct	12 ms	9848 KB	Output is correct
3	Correct	10 ms	9884 KB	Output is correct
4	Correct	12 ms	9992 KB	Output is correct
5	Correct	10 ms	9992 KB	Output is correct
6	Correct	10 ms	9992 KB	Output is correct
7	Correct	12 ms	9992 KB	Output is correct
8	Correct	11 ms	10096 KB	Output is correct
9	Correct	11 ms	10096 KB	Output is correct
10	Correct	11 ms	10096 KB	Output is correct
11	Correct	10 ms	10096 KB	Output is correct
12	Correct	11 ms	10096 KB	Output is correct
13	Correct	12 ms	10096 KB	Output is correct
14	Correct	14 ms	10096 KB	Output is correct
15	Correct	12 ms	10096 KB	Output is correct
16	Correct	13 ms	10096 KB	Output is correct
17	Correct	12 ms	10096 KB	Output is correct
18	Correct	12 ms	10096 KB	Output is correct
19	Correct	11 ms	10096 KB	Output is correct
20	Correct	12 ms	10096 KB	Output is correct
21	Correct	12 ms	10096 KB	Output is correct
22	Correct	10 ms	10096 KB	Output is correct
23	Correct	12 ms	10096 KB	Output is correct
24	Correct	11 ms	10096 KB	Output is correct
25	Correct	12 ms	10096 KB	Output is correct
26	Correct	11 ms	10096 KB	Output is correct
27	Correct	11 ms	10096 KB	Output is correct
28	Correct	11 ms	10096 KB	Output is correct
29	Correct	12 ms	10096 KB	Output is correct
30	Correct	10 ms	10096 KB	Output is correct
31	Correct	14 ms	10096 KB	Output is correct
32	Correct	13 ms	10096 KB	Output is correct
33	Correct	12 ms	10096 KB	Output is correct
34	Correct	10 ms	10096 KB	Output is correct
35	Correct	12 ms	10096 KB	Output is correct
36	Correct	11 ms	10096 KB	Output is correct
37	Correct	12 ms	10096 KB	Output is correct
38	Correct	13 ms	10096 KB	Output is correct
39	Correct	9 ms	10096 KB	Output is correct
40	Correct	13 ms	10096 KB	Output is correct
41	Correct	14 ms	10096 KB	Output is correct
42	Correct	13 ms	10108 KB	Output is correct
43	Correct	12 ms	10108 KB	Output is correct
44	Correct	11 ms	10108 KB	Output is correct
45	Correct	11 ms	10108 KB	Output is correct
46	Correct	11 ms	10108 KB	Output is correct
47	Correct	11 ms	10108 KB	Output is correct
48	Correct	13 ms	10108 KB	Output is correct
49	Correct	13 ms	10108 KB	Output is correct
50	Correct	12 ms	10108 KB	Output is correct
51	Correct	11 ms	10108 KB	Output is correct
52	Correct	13 ms	10220 KB	Output is correct
53	Correct	13 ms	10220 KB	Output is correct
54	Correct	12 ms	10220 KB	Output is correct
55	Correct	12 ms	10220 KB	Output is correct
56	Correct	13 ms	10220 KB	Output is correct
57	Correct	14 ms	10220 KB	Output is correct
58	Correct	14 ms	10220 KB	Output is correct
59	Correct	12 ms	10220 KB	Output is correct
60	Correct	14 ms	10220 KB	Output is correct
61	Correct	12 ms	10220 KB	Output is correct
62	Incorrect	12 ms	10220 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	10 ms	9848 KB	Output is correct
2	Correct	12 ms	9848 KB	Output is correct
3	Correct	10 ms	9884 KB	Output is correct
4	Correct	12 ms	9992 KB	Output is correct
5	Correct	10 ms	9992 KB	Output is correct
6	Correct	10 ms	9992 KB	Output is correct
7	Correct	12 ms	9992 KB	Output is correct
8	Correct	11 ms	10096 KB	Output is correct
9	Correct	11 ms	10096 KB	Output is correct
10	Correct	11 ms	10096 KB	Output is correct
11	Correct	10 ms	10096 KB	Output is correct
12	Correct	11 ms	10096 KB	Output is correct
13	Correct	12 ms	10096 KB	Output is correct
14	Correct	14 ms	10096 KB	Output is correct
15	Correct	12 ms	10096 KB	Output is correct
16	Correct	13 ms	10096 KB	Output is correct
17	Correct	12 ms	10096 KB	Output is correct
18	Correct	12 ms	10096 KB	Output is correct
19	Correct	11 ms	10096 KB	Output is correct
20	Correct	12 ms	10096 KB	Output is correct
21	Correct	12 ms	10096 KB	Output is correct
22	Correct	10 ms	10096 KB	Output is correct
23	Correct	12 ms	10096 KB	Output is correct
24	Correct	11 ms	10096 KB	Output is correct
25	Correct	12 ms	10096 KB	Output is correct
26	Correct	11 ms	10096 KB	Output is correct
27	Correct	11 ms	10096 KB	Output is correct
28	Correct	11 ms	10096 KB	Output is correct
29	Correct	12 ms	10096 KB	Output is correct
30	Correct	10 ms	10096 KB	Output is correct
31	Correct	14 ms	10096 KB	Output is correct
32	Correct	13 ms	10096 KB	Output is correct
33	Correct	12 ms	10096 KB	Output is correct
34	Correct	10 ms	10096 KB	Output is correct
35	Correct	12 ms	10096 KB	Output is correct
36	Correct	11 ms	10096 KB	Output is correct
37	Correct	12 ms	10096 KB	Output is correct
38	Correct	13 ms	10096 KB	Output is correct
39	Correct	9 ms	10096 KB	Output is correct
40	Correct	13 ms	10096 KB	Output is correct
41	Correct	14 ms	10096 KB	Output is correct
42	Correct	13 ms	10108 KB	Output is correct
43	Correct	12 ms	10108 KB	Output is correct
44	Correct	11 ms	10108 KB	Output is correct
45	Correct	11 ms	10108 KB	Output is correct
46	Correct	11 ms	10108 KB	Output is correct
47	Correct	11 ms	10108 KB	Output is correct
48	Correct	13 ms	10108 KB	Output is correct
49	Correct	13 ms	10108 KB	Output is correct
50	Correct	12 ms	10108 KB	Output is correct
51	Correct	11 ms	10108 KB	Output is correct
52	Correct	13 ms	10220 KB	Output is correct
53	Correct	13 ms	10220 KB	Output is correct
54	Correct	12 ms	10220 KB	Output is correct
55	Correct	12 ms	10220 KB	Output is correct
56	Correct	13 ms	10220 KB	Output is correct
57	Correct	14 ms	10220 KB	Output is correct
58	Correct	14 ms	10220 KB	Output is correct
59	Correct	12 ms	10220 KB	Output is correct
60	Correct	14 ms	10220 KB	Output is correct
61	Correct	12 ms	10220 KB	Output is correct
62	Incorrect	12 ms	10220 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	121 ms	17752 KB	Output is correct
2	Correct	17 ms	17752 KB	Output is correct
3	Correct	38 ms	17752 KB	Output is correct
4	Correct	60 ms	17752 KB	Output is correct
5	Correct	178 ms	18444 KB	Output is correct
6	Correct	127 ms	18444 KB	Output is correct
7	Correct	163 ms	18444 KB	Output is correct
8	Incorrect	17 ms	18444 KB	'impossible' claimed, but there is a solution
9	Halted	0 ms	0 KB	-

Subtask #5
0 / 26.0

#	결과	실행 시간	메모리	Grader output
1	Correct	10 ms	9848 KB	Output is correct
2	Correct	12 ms	9848 KB	Output is correct
3	Correct	10 ms	9884 KB	Output is correct
4	Correct	12 ms	9992 KB	Output is correct
5	Correct	10 ms	9992 KB	Output is correct
6	Correct	10 ms	9992 KB	Output is correct
7	Correct	12 ms	9992 KB	Output is correct
8	Correct	11 ms	10096 KB	Output is correct
9	Correct	11 ms	10096 KB	Output is correct
10	Correct	11 ms	10096 KB	Output is correct
11	Correct	10 ms	10096 KB	Output is correct
12	Correct	11 ms	10096 KB	Output is correct
13	Correct	12 ms	10096 KB	Output is correct
14	Correct	14 ms	10096 KB	Output is correct
15	Correct	12 ms	10096 KB	Output is correct
16	Correct	13 ms	10096 KB	Output is correct
17	Correct	12 ms	10096 KB	Output is correct
18	Correct	12 ms	10096 KB	Output is correct
19	Correct	11 ms	10096 KB	Output is correct
20	Correct	12 ms	10096 KB	Output is correct
21	Correct	12 ms	10096 KB	Output is correct
22	Correct	10 ms	10096 KB	Output is correct
23	Correct	12 ms	10096 KB	Output is correct
24	Correct	11 ms	10096 KB	Output is correct
25	Correct	12 ms	10096 KB	Output is correct
26	Correct	11 ms	10096 KB	Output is correct
27	Correct	11 ms	10096 KB	Output is correct
28	Correct	11 ms	10096 KB	Output is correct
29	Correct	12 ms	10096 KB	Output is correct
30	Correct	10 ms	10096 KB	Output is correct
31	Correct	14 ms	10096 KB	Output is correct
32	Correct	13 ms	10096 KB	Output is correct
33	Correct	12 ms	10096 KB	Output is correct
34	Correct	10 ms	10096 KB	Output is correct
35	Correct	12 ms	10096 KB	Output is correct
36	Correct	11 ms	10096 KB	Output is correct
37	Correct	12 ms	10096 KB	Output is correct
38	Correct	13 ms	10096 KB	Output is correct
39	Correct	9 ms	10096 KB	Output is correct
40	Correct	13 ms	10096 KB	Output is correct
41	Correct	14 ms	10096 KB	Output is correct
42	Correct	13 ms	10108 KB	Output is correct
43	Correct	12 ms	10108 KB	Output is correct
44	Correct	11 ms	10108 KB	Output is correct
45	Correct	11 ms	10108 KB	Output is correct
46	Correct	11 ms	10108 KB	Output is correct
47	Correct	11 ms	10108 KB	Output is correct
48	Correct	13 ms	10108 KB	Output is correct
49	Correct	13 ms	10108 KB	Output is correct
50	Correct	12 ms	10108 KB	Output is correct
51	Correct	11 ms	10108 KB	Output is correct
52	Correct	13 ms	10220 KB	Output is correct
53	Correct	13 ms	10220 KB	Output is correct
54	Correct	12 ms	10220 KB	Output is correct
55	Correct	12 ms	10220 KB	Output is correct
56	Correct	13 ms	10220 KB	Output is correct
57	Correct	14 ms	10220 KB	Output is correct
58	Correct	14 ms	10220 KB	Output is correct
59	Correct	12 ms	10220 KB	Output is correct
60	Correct	14 ms	10220 KB	Output is correct
61	Correct	12 ms	10220 KB	Output is correct
62	Incorrect	12 ms	10220 KB	no wires in direction 0 between segments 59 and 59
63	Halted	0 ms	0 KB	-

답안 #63233

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