Submission #109666

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
109666	2019-05-07T09:26:26 Z	jangwonyoung	Alternating Current (BOI18_alternating)	C++14	74 / 100	306 ms	16396 KB

alternating

#include<bits/stdc++.h>
using namespace std;
#define pb push_back
const int N=1e5+1,M=1e5+1;
int n,m;
int u[M],v[M];
vector<int>add[M];
bool in[M];
set<int>s;
vector<int>adj[M];
int col[M];
bool ok=true;
void dfs(int id){
	for(auto cur:adj[id]){
		if(col[cur]==col[id]) ok=false;
		if(!col[cur]){
			col[cur]=3-col[id];
			dfs(cur);
		}
	}
}
int lz[262144],mi[262144];
void push(int id){
	lz[id*2]+=lz[id];
	mi[id*2]+=lz[id];
	lz[id*2+1]+=lz[id];
	mi[id*2+1]+=lz[id];
	lz[id]=0;
}
void upd(int id,int l,int r,int ql,int qr,int v){
	if(l>qr || r<ql) return;
	if(ql<=l && r<=qr){
		lz[id]+=v;mi[id]+=v;return;
	}
	push(id);
	int mid=(l+r)/2;
	upd(id*2,l,mid,ql,qr,v);upd(id*2+1,mid+1,r,ql,qr,v);
}
int qry(int id,int l,int r,int ql,int qr){
	if(l>qr || r<ql) return 1e9;
	if(ql<=l && r<=qr) return mi[id];
	push(id);
	int mid=(l+r)/2;
	return min(qry(id*2,l,mid,ql,qr),qry(id*2+1,mid+1,r,ql,qr));
}
int main(){
	ios::sync_with_stdio(false);
	cin >> n >> m;
	for(int i=1; i<=m ;i++){
		cin >> u[i] >> v[i];
		add[u[i]-1].pb(i);add[v[i]].pb(i);
		if(u[i]>v[i] || u[i]==1) s.insert(i),in[i]=true;
	}
	for(int i=1; i<=n ;i++){
		if(s.size()<2) return cout << "impossible\n",0;
		if(s.size()==2){
			int x=*s.begin(),y=*s.rbegin();
			adj[x].pb(y);adj[y].pb(x);
		}
		for(auto cur:add[i]){
			if(in[cur]) in[cur]=false,s.erase(cur);
			else in[cur]=true,s.insert(cur);
		}
	}
	for(int i=1; i<=m ;i++){
		if(!col[i]){col[i]=1;dfs(i);}
		if(col[i]==1){
			if(u[i]<=v[i]) upd(1,1,n,u[i],v[i],1);
			else upd(1,1,n,u[i],n,1),upd(1,1,n,1,v[i],1);
		}
	}
	if(!ok) return cout << "impossible\n",0;
	for(int i=1; i<=m ;i++){
		if(col[i]!=1){cout << "0";continue;}
		int val;
		if(u[i]<=v[i]) val=qry(1,1,n,u[i],v[i]);
		else val=min(qry(1,1,n,u[i],n),qry(1,1,n,1,v[i]));
		if(val==1){cout << "1";continue;}
		if(u[i]<=v[i]) upd(1,1,n,u[i],v[i],-1);
		else upd(1,1,n,u[i],n,-1),upd(1,1,n,1,v[i],-1);
		cout << "0";
	}
	cout << endl;
}

Subtask #1
13.0 / 13.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	6 ms	4992 KB	Output is correct
2	Correct	7 ms	4992 KB	Output is correct
3	Correct	6 ms	5120 KB	Output is correct
4	Correct	7 ms	5120 KB	Output is correct
5	Correct	8 ms	5120 KB	Output is correct
6	Correct	6 ms	4992 KB	Output is correct
7	Correct	7 ms	5120 KB	Output is correct
8	Correct	7 ms	5092 KB	Output is correct
9	Correct	8 ms	5120 KB	Output is correct
10	Correct	9 ms	5248 KB	Output is correct
11	Correct	6 ms	4992 KB	Output is correct
12	Correct	7 ms	4988 KB	Output is correct
13	Correct	7 ms	5120 KB	Output is correct
14	Correct	7 ms	4992 KB	Output is correct
15	Correct	7 ms	5120 KB	Output is correct
16	Correct	7 ms	5120 KB	Output is correct
17	Correct	6 ms	4992 KB	Output is correct
18	Correct	6 ms	4992 KB	Output is correct
19	Correct	6 ms	4992 KB	Output is correct
20	Correct	6 ms	4992 KB	Output is correct
21	Correct	7 ms	5120 KB	Output is correct
22	Correct	6 ms	4992 KB	Output is correct
23	Correct	6 ms	5120 KB	Output is correct
24	Correct	6 ms	4992 KB	Output is correct
25	Correct	7 ms	4992 KB	Output is correct
26	Correct	6 ms	4992 KB	Output is correct
27	Correct	9 ms	4992 KB	Output is correct
28	Correct	8 ms	5120 KB	Output is correct
29	Correct	7 ms	5120 KB	Output is correct
30	Correct	7 ms	5120 KB	Output is correct
31	Correct	6 ms	5120 KB	Output is correct
32	Correct	6 ms	4992 KB	Output is correct
33	Correct	7 ms	4992 KB	Output is correct
34	Correct	9 ms	4992 KB	Output is correct
35	Correct	6 ms	5000 KB	Output is correct
36	Correct	6 ms	4992 KB	Output is correct
37	Correct	6 ms	5120 KB	Output is correct
38	Correct	7 ms	5120 KB	Output is correct
39	Correct	8 ms	4992 KB	Output is correct
40	Correct	7 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	7 ms	4992 KB	Output is correct
3	Correct	6 ms	5120 KB	Output is correct
4	Correct	7 ms	5120 KB	Output is correct
5	Correct	8 ms	5120 KB	Output is correct
6	Correct	6 ms	4992 KB	Output is correct
7	Correct	7 ms	5120 KB	Output is correct
8	Correct	7 ms	5092 KB	Output is correct
9	Correct	8 ms	5120 KB	Output is correct
10	Correct	9 ms	5248 KB	Output is correct
11	Correct	6 ms	4992 KB	Output is correct
12	Correct	7 ms	4988 KB	Output is correct
13	Correct	7 ms	5120 KB	Output is correct
14	Correct	7 ms	4992 KB	Output is correct
15	Correct	7 ms	5120 KB	Output is correct
16	Correct	7 ms	5120 KB	Output is correct
17	Correct	6 ms	4992 KB	Output is correct
18	Correct	6 ms	4992 KB	Output is correct
19	Correct	6 ms	4992 KB	Output is correct
20	Correct	6 ms	4992 KB	Output is correct
21	Correct	7 ms	5120 KB	Output is correct
22	Correct	6 ms	4992 KB	Output is correct
23	Correct	6 ms	5120 KB	Output is correct
24	Correct	6 ms	4992 KB	Output is correct
25	Correct	7 ms	4992 KB	Output is correct
26	Correct	6 ms	4992 KB	Output is correct
27	Correct	9 ms	4992 KB	Output is correct
28	Correct	8 ms	5120 KB	Output is correct
29	Correct	7 ms	5120 KB	Output is correct
30	Correct	7 ms	5120 KB	Output is correct
31	Correct	6 ms	5120 KB	Output is correct
32	Correct	6 ms	4992 KB	Output is correct
33	Correct	7 ms	4992 KB	Output is correct
34	Correct	9 ms	4992 KB	Output is correct
35	Correct	6 ms	5000 KB	Output is correct
36	Correct	6 ms	4992 KB	Output is correct
37	Correct	6 ms	5120 KB	Output is correct
38	Correct	7 ms	5120 KB	Output is correct
39	Correct	8 ms	4992 KB	Output is correct
40	Correct	7 ms	4992 KB	Output is correct
41	Correct	6 ms	5120 KB	Output is correct
42	Correct	6 ms	4992 KB	Output is correct
43	Correct	7 ms	5120 KB	Output is correct
44	Correct	6 ms	5120 KB	Output is correct
45	Correct	6 ms	5120 KB	Output is correct
46	Correct	6 ms	5120 KB	Output is correct
47	Correct	6 ms	4992 KB	Output is correct
48	Correct	6 ms	5120 KB	Output is correct
49	Correct	7 ms	5120 KB	Output is correct
50	Correct	6 ms	5120 KB	Output is correct
51	Correct	5 ms	4992 KB	Output is correct
52	Correct	6 ms	4992 KB	Output is correct
53	Correct	6 ms	4992 KB	Output is correct
54	Correct	7 ms	5120 KB	Output is correct
55	Correct	8 ms	5068 KB	Output is correct
56	Correct	8 ms	5120 KB	Output is correct
57	Correct	7 ms	5120 KB	Output is correct
58	Correct	7 ms	5120 KB	Output is correct
59	Correct	8 ms	5120 KB	Output is correct
60	Correct	7 ms	5120 KB	Output is correct
61	Correct	7 ms	5120 KB	Output is correct
62	Correct	7 ms	5120 KB	Output is correct
63	Correct	7 ms	5120 KB	Output is correct
64	Correct	6 ms	5120 KB	Output is correct
65	Correct	6 ms	5120 KB	Output is correct
66	Correct	7 ms	5092 KB	Output is correct
67	Correct	7 ms	5120 KB	Output is correct
68	Correct	6 ms	5120 KB	Output is correct
69	Correct	6 ms	5248 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	7 ms	4992 KB	Output is correct
3	Correct	6 ms	5120 KB	Output is correct
4	Correct	7 ms	5120 KB	Output is correct
5	Correct	8 ms	5120 KB	Output is correct
6	Correct	6 ms	4992 KB	Output is correct
7	Correct	7 ms	5120 KB	Output is correct
8	Correct	7 ms	5092 KB	Output is correct
9	Correct	8 ms	5120 KB	Output is correct
10	Correct	9 ms	5248 KB	Output is correct
11	Correct	6 ms	4992 KB	Output is correct
12	Correct	7 ms	4988 KB	Output is correct
13	Correct	7 ms	5120 KB	Output is correct
14	Correct	7 ms	4992 KB	Output is correct
15	Correct	7 ms	5120 KB	Output is correct
16	Correct	7 ms	5120 KB	Output is correct
17	Correct	6 ms	4992 KB	Output is correct
18	Correct	6 ms	4992 KB	Output is correct
19	Correct	6 ms	4992 KB	Output is correct
20	Correct	6 ms	4992 KB	Output is correct
21	Correct	7 ms	5120 KB	Output is correct
22	Correct	6 ms	4992 KB	Output is correct
23	Correct	6 ms	5120 KB	Output is correct
24	Correct	6 ms	4992 KB	Output is correct
25	Correct	7 ms	4992 KB	Output is correct
26	Correct	6 ms	4992 KB	Output is correct
27	Correct	9 ms	4992 KB	Output is correct
28	Correct	8 ms	5120 KB	Output is correct
29	Correct	7 ms	5120 KB	Output is correct
30	Correct	7 ms	5120 KB	Output is correct
31	Correct	6 ms	5120 KB	Output is correct
32	Correct	6 ms	4992 KB	Output is correct
33	Correct	7 ms	4992 KB	Output is correct
34	Correct	9 ms	4992 KB	Output is correct
35	Correct	6 ms	5000 KB	Output is correct
36	Correct	6 ms	4992 KB	Output is correct
37	Correct	6 ms	5120 KB	Output is correct
38	Correct	7 ms	5120 KB	Output is correct
39	Correct	8 ms	4992 KB	Output is correct
40	Correct	7 ms	4992 KB	Output is correct
41	Correct	6 ms	5120 KB	Output is correct
42	Correct	6 ms	4992 KB	Output is correct
43	Correct	7 ms	5120 KB	Output is correct
44	Correct	6 ms	5120 KB	Output is correct
45	Correct	6 ms	5120 KB	Output is correct
46	Correct	6 ms	5120 KB	Output is correct
47	Correct	6 ms	4992 KB	Output is correct
48	Correct	6 ms	5120 KB	Output is correct
49	Correct	7 ms	5120 KB	Output is correct
50	Correct	6 ms	5120 KB	Output is correct
51	Correct	5 ms	4992 KB	Output is correct
52	Correct	6 ms	4992 KB	Output is correct
53	Correct	6 ms	4992 KB	Output is correct
54	Correct	7 ms	5120 KB	Output is correct
55	Correct	8 ms	5068 KB	Output is correct
56	Correct	8 ms	5120 KB	Output is correct
57	Correct	7 ms	5120 KB	Output is correct
58	Correct	7 ms	5120 KB	Output is correct
59	Correct	8 ms	5120 KB	Output is correct
60	Correct	7 ms	5120 KB	Output is correct
61	Correct	7 ms	5120 KB	Output is correct
62	Correct	7 ms	5120 KB	Output is correct
63	Correct	7 ms	5120 KB	Output is correct
64	Correct	6 ms	5120 KB	Output is correct
65	Correct	6 ms	5120 KB	Output is correct
66	Correct	7 ms	5092 KB	Output is correct
67	Correct	7 ms	5120 KB	Output is correct
68	Correct	6 ms	5120 KB	Output is correct
69	Correct	6 ms	5248 KB	Output is correct
70	Correct	6 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	6 ms	5120 KB	Output is correct
74	Correct	8 ms	5120 KB	Output is correct
75	Correct	8 ms	5120 KB	Output is correct
76	Correct	10 ms	5120 KB	Output is correct
77	Correct	8 ms	5120 KB	Output is correct
78	Correct	7 ms	5120 KB	Output is correct
79	Correct	7 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	7 ms	5120 KB	Output is correct
83	Correct	8 ms	5120 KB	Output is correct
84	Correct	8 ms	5196 KB	Output is correct
85	Correct	7 ms	5120 KB	Output is correct
86	Correct	7 ms	5120 KB	Output is correct
87	Correct	7 ms	5120 KB	Output is correct
88	Correct	6 ms	5120 KB	Output is correct
89	Correct	7 ms	5120 KB	Output is correct
90	Correct	9 ms	5120 KB	Output is correct
91	Correct	8 ms	5088 KB	Output is correct
92	Correct	9 ms	5120 KB	Output is correct
93	Correct	7 ms	5120 KB	Output is correct
94	Correct	7 ms	5120 KB	Output is correct
95	Correct	8 ms	5120 KB	Output is correct
96	Correct	9 ms	5120 KB	Output is correct
97	Correct	8 ms	5120 KB	Output is correct
98	Correct	8 ms	5120 KB	Output is correct

Subtask #4
19.0 / 19.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	72 ms	12852 KB	Output is correct
2	Correct	8 ms	6140 KB	Output is correct
3	Correct	28 ms	9152 KB	Output is correct
4	Correct	89 ms	13788 KB	Output is correct
5	Correct	142 ms	14916 KB	Output is correct
6	Correct	72 ms	9848 KB	Output is correct
7	Correct	141 ms	15096 KB	Output is correct
8	Correct	14 ms	8064 KB	Output is correct
9	Correct	11 ms	7808 KB	Output is correct
10	Correct	154 ms	15232 KB	Output is correct
11	Correct	134 ms	13688 KB	Output is correct
12	Correct	185 ms	15552 KB	Output is correct
13	Correct	9 ms	6052 KB	Output is correct
14	Correct	9 ms	6016 KB	Output is correct
15	Correct	149 ms	11904 KB	Output is correct
16	Correct	34 ms	11512 KB	Output is correct
17	Correct	306 ms	15068 KB	Output is correct
18	Correct	239 ms	11128 KB	Output is correct
19	Correct	12 ms	5496 KB	Output is correct
20	Correct	74 ms	13304 KB	Output is correct

Subtask #5
0 / 26.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	6 ms	4992 KB	Output is correct
2	Correct	7 ms	4992 KB	Output is correct
3	Correct	6 ms	5120 KB	Output is correct
4	Correct	7 ms	5120 KB	Output is correct
5	Correct	8 ms	5120 KB	Output is correct
6	Correct	6 ms	4992 KB	Output is correct
7	Correct	7 ms	5120 KB	Output is correct
8	Correct	7 ms	5092 KB	Output is correct
9	Correct	8 ms	5120 KB	Output is correct
10	Correct	9 ms	5248 KB	Output is correct
11	Correct	6 ms	4992 KB	Output is correct
12	Correct	7 ms	4988 KB	Output is correct
13	Correct	7 ms	5120 KB	Output is correct
14	Correct	7 ms	4992 KB	Output is correct
15	Correct	7 ms	5120 KB	Output is correct
16	Correct	7 ms	5120 KB	Output is correct
17	Correct	6 ms	4992 KB	Output is correct
18	Correct	6 ms	4992 KB	Output is correct
19	Correct	6 ms	4992 KB	Output is correct
20	Correct	6 ms	4992 KB	Output is correct
21	Correct	7 ms	5120 KB	Output is correct
22	Correct	6 ms	4992 KB	Output is correct
23	Correct	6 ms	5120 KB	Output is correct
24	Correct	6 ms	4992 KB	Output is correct
25	Correct	7 ms	4992 KB	Output is correct
26	Correct	6 ms	4992 KB	Output is correct
27	Correct	9 ms	4992 KB	Output is correct
28	Correct	8 ms	5120 KB	Output is correct
29	Correct	7 ms	5120 KB	Output is correct
30	Correct	7 ms	5120 KB	Output is correct
31	Correct	6 ms	5120 KB	Output is correct
32	Correct	6 ms	4992 KB	Output is correct
33	Correct	7 ms	4992 KB	Output is correct
34	Correct	9 ms	4992 KB	Output is correct
35	Correct	6 ms	5000 KB	Output is correct
36	Correct	6 ms	4992 KB	Output is correct
37	Correct	6 ms	5120 KB	Output is correct
38	Correct	7 ms	5120 KB	Output is correct
39	Correct	8 ms	4992 KB	Output is correct
40	Correct	7 ms	4992 KB	Output is correct
41	Correct	6 ms	5120 KB	Output is correct
42	Correct	6 ms	4992 KB	Output is correct
43	Correct	7 ms	5120 KB	Output is correct
44	Correct	6 ms	5120 KB	Output is correct
45	Correct	6 ms	5120 KB	Output is correct
46	Correct	6 ms	5120 KB	Output is correct
47	Correct	6 ms	4992 KB	Output is correct
48	Correct	6 ms	5120 KB	Output is correct
49	Correct	7 ms	5120 KB	Output is correct
50	Correct	6 ms	5120 KB	Output is correct
51	Correct	5 ms	4992 KB	Output is correct
52	Correct	6 ms	4992 KB	Output is correct
53	Correct	6 ms	4992 KB	Output is correct
54	Correct	7 ms	5120 KB	Output is correct
55	Correct	8 ms	5068 KB	Output is correct
56	Correct	8 ms	5120 KB	Output is correct
57	Correct	7 ms	5120 KB	Output is correct
58	Correct	7 ms	5120 KB	Output is correct
59	Correct	8 ms	5120 KB	Output is correct
60	Correct	7 ms	5120 KB	Output is correct
61	Correct	7 ms	5120 KB	Output is correct
62	Correct	7 ms	5120 KB	Output is correct
63	Correct	7 ms	5120 KB	Output is correct
64	Correct	6 ms	5120 KB	Output is correct
65	Correct	6 ms	5120 KB	Output is correct
66	Correct	7 ms	5092 KB	Output is correct
67	Correct	7 ms	5120 KB	Output is correct
68	Correct	6 ms	5120 KB	Output is correct
69	Correct	6 ms	5248 KB	Output is correct
70	Correct	6 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	6 ms	5120 KB	Output is correct
74	Correct	8 ms	5120 KB	Output is correct
75	Correct	8 ms	5120 KB	Output is correct
76	Correct	10 ms	5120 KB	Output is correct
77	Correct	8 ms	5120 KB	Output is correct
78	Correct	7 ms	5120 KB	Output is correct
79	Correct	7 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	7 ms	5120 KB	Output is correct
83	Correct	8 ms	5120 KB	Output is correct
84	Correct	8 ms	5196 KB	Output is correct
85	Correct	7 ms	5120 KB	Output is correct
86	Correct	7 ms	5120 KB	Output is correct
87	Correct	7 ms	5120 KB	Output is correct
88	Correct	6 ms	5120 KB	Output is correct
89	Correct	7 ms	5120 KB	Output is correct
90	Correct	9 ms	5120 KB	Output is correct
91	Correct	8 ms	5088 KB	Output is correct
92	Correct	9 ms	5120 KB	Output is correct
93	Correct	7 ms	5120 KB	Output is correct
94	Correct	7 ms	5120 KB	Output is correct
95	Correct	8 ms	5120 KB	Output is correct
96	Correct	9 ms	5120 KB	Output is correct
97	Correct	8 ms	5120 KB	Output is correct
98	Correct	8 ms	5120 KB	Output is correct
99	Correct	72 ms	12852 KB	Output is correct
100	Correct	8 ms	6140 KB	Output is correct
101	Correct	28 ms	9152 KB	Output is correct
102	Correct	89 ms	13788 KB	Output is correct
103	Correct	142 ms	14916 KB	Output is correct
104	Correct	72 ms	9848 KB	Output is correct
105	Correct	141 ms	15096 KB	Output is correct
106	Correct	14 ms	8064 KB	Output is correct
107	Correct	11 ms	7808 KB	Output is correct
108	Correct	154 ms	15232 KB	Output is correct
109	Correct	134 ms	13688 KB	Output is correct
110	Correct	185 ms	15552 KB	Output is correct
111	Correct	9 ms	6052 KB	Output is correct
112	Correct	9 ms	6016 KB	Output is correct
113	Correct	149 ms	11904 KB	Output is correct
114	Correct	34 ms	11512 KB	Output is correct
115	Correct	306 ms	15068 KB	Output is correct
116	Correct	239 ms	11128 KB	Output is correct
117	Correct	12 ms	5496 KB	Output is correct
118	Correct	74 ms	13304 KB	Output is correct
119	Correct	10 ms	6784 KB	Output is correct
120	Correct	132 ms	16396 KB	Output is correct
121	Incorrect	74 ms	11896 KB	no wires in direction 0 between segments 80993 and 80994
122	Halted	0 ms	0 KB	-

Submission #109666

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 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
0 / 26.0