답안 #63219 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
63219	2018-08-01T06:23:43 Z	김세빈(#1833)	Alternating Current (BOI18_alternating)	C++11	0 / 100	177 ms	18808 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+1; 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){
			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
0 / 13.0

#	결과	실행 시간	메모리	Grader output
1	Correct	10 ms	9720 KB	Output is correct
2	Correct	10 ms	9832 KB	Output is correct
3	Correct	12 ms	10032 KB	Output is correct
4	Correct	11 ms	10032 KB	Output is correct
5	Correct	10 ms	10032 KB	Output is correct
6	Correct	10 ms	10032 KB	Output is correct
7	Correct	10 ms	10060 KB	Output is correct
8	Correct	12 ms	10084 KB	Output is correct
9	Correct	12 ms	10216 KB	Output is correct
10	Correct	11 ms	10216 KB	Output is correct
11	Correct	12 ms	10216 KB	Output is correct
12	Correct	12 ms	10216 KB	Output is correct
13	Correct	12 ms	10216 KB	Output is correct
14	Correct	11 ms	10216 KB	Output is correct
15	Correct	9 ms	10216 KB	Output is correct
16	Correct	10 ms	10216 KB	Output is correct
17	Correct	10 ms	10216 KB	Output is correct
18	Correct	10 ms	10216 KB	Output is correct
19	Correct	9 ms	10216 KB	Output is correct
20	Correct	13 ms	10236 KB	Output is correct
21	Correct	11 ms	10240 KB	Output is correct
22	Correct	10 ms	10240 KB	Output is correct
23	Correct	14 ms	10240 KB	Output is correct
24	Correct	10 ms	10240 KB	Output is correct
25	Correct	10 ms	10240 KB	Output is correct
26	Correct	11 ms	10240 KB	Output is correct
27	Incorrect	12 ms	10240 KB	no wires in direction 0 between segments 15 and 15
28	Halted	0 ms	0 KB	-

Subtask #2
0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	10 ms	9720 KB	Output is correct
2	Correct	10 ms	9832 KB	Output is correct
3	Correct	12 ms	10032 KB	Output is correct
4	Correct	11 ms	10032 KB	Output is correct
5	Correct	10 ms	10032 KB	Output is correct
6	Correct	10 ms	10032 KB	Output is correct
7	Correct	10 ms	10060 KB	Output is correct
8	Correct	12 ms	10084 KB	Output is correct
9	Correct	12 ms	10216 KB	Output is correct
10	Correct	11 ms	10216 KB	Output is correct
11	Correct	12 ms	10216 KB	Output is correct
12	Correct	12 ms	10216 KB	Output is correct
13	Correct	12 ms	10216 KB	Output is correct
14	Correct	11 ms	10216 KB	Output is correct
15	Correct	9 ms	10216 KB	Output is correct
16	Correct	10 ms	10216 KB	Output is correct
17	Correct	10 ms	10216 KB	Output is correct
18	Correct	10 ms	10216 KB	Output is correct
19	Correct	9 ms	10216 KB	Output is correct
20	Correct	13 ms	10236 KB	Output is correct
21	Correct	11 ms	10240 KB	Output is correct
22	Correct	10 ms	10240 KB	Output is correct
23	Correct	14 ms	10240 KB	Output is correct
24	Correct	10 ms	10240 KB	Output is correct
25	Correct	10 ms	10240 KB	Output is correct
26	Correct	11 ms	10240 KB	Output is correct
27	Incorrect	12 ms	10240 KB	no wires in direction 0 between segments 15 and 15
28	Halted	0 ms	0 KB	-

Subtask #3
0 / 22.0

#	결과	실행 시간	메모리	Grader output
1	Correct	10 ms	9720 KB	Output is correct
2	Correct	10 ms	9832 KB	Output is correct
3	Correct	12 ms	10032 KB	Output is correct
4	Correct	11 ms	10032 KB	Output is correct
5	Correct	10 ms	10032 KB	Output is correct
6	Correct	10 ms	10032 KB	Output is correct
7	Correct	10 ms	10060 KB	Output is correct
8	Correct	12 ms	10084 KB	Output is correct
9	Correct	12 ms	10216 KB	Output is correct
10	Correct	11 ms	10216 KB	Output is correct
11	Correct	12 ms	10216 KB	Output is correct
12	Correct	12 ms	10216 KB	Output is correct
13	Correct	12 ms	10216 KB	Output is correct
14	Correct	11 ms	10216 KB	Output is correct
15	Correct	9 ms	10216 KB	Output is correct
16	Correct	10 ms	10216 KB	Output is correct
17	Correct	10 ms	10216 KB	Output is correct
18	Correct	10 ms	10216 KB	Output is correct
19	Correct	9 ms	10216 KB	Output is correct
20	Correct	13 ms	10236 KB	Output is correct
21	Correct	11 ms	10240 KB	Output is correct
22	Correct	10 ms	10240 KB	Output is correct
23	Correct	14 ms	10240 KB	Output is correct
24	Correct	10 ms	10240 KB	Output is correct
25	Correct	10 ms	10240 KB	Output is correct
26	Correct	11 ms	10240 KB	Output is correct
27	Incorrect	12 ms	10240 KB	no wires in direction 0 between segments 15 and 15
28	Halted	0 ms	0 KB	-

Subtask #4
0 / 19.0

#	결과	실행 시간	메모리	Grader output
1	Correct	125 ms	17768 KB	Output is correct
2	Correct	15 ms	17768 KB	Output is correct
3	Correct	39 ms	17768 KB	Output is correct
4	Correct	62 ms	17768 KB	Output is correct
5	Correct	177 ms	18444 KB	Output is correct
6	Correct	106 ms	18444 KB	Output is correct
7	Correct	160 ms	18444 KB	Output is correct
8	Correct	23 ms	18444 KB	Output is correct
9	Correct	16 ms	18444 KB	Output is correct
10	Correct	175 ms	18808 KB	Output is correct
11	Correct	143 ms	18808 KB	Output is correct
12	Correct	150 ms	18808 KB	Output is correct
13	Incorrect	15 ms	18808 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	10 ms	9720 KB	Output is correct
2	Correct	10 ms	9832 KB	Output is correct
3	Correct	12 ms	10032 KB	Output is correct
4	Correct	11 ms	10032 KB	Output is correct
5	Correct	10 ms	10032 KB	Output is correct
6	Correct	10 ms	10032 KB	Output is correct
7	Correct	10 ms	10060 KB	Output is correct
8	Correct	12 ms	10084 KB	Output is correct
9	Correct	12 ms	10216 KB	Output is correct
10	Correct	11 ms	10216 KB	Output is correct
11	Correct	12 ms	10216 KB	Output is correct
12	Correct	12 ms	10216 KB	Output is correct
13	Correct	12 ms	10216 KB	Output is correct
14	Correct	11 ms	10216 KB	Output is correct
15	Correct	9 ms	10216 KB	Output is correct
16	Correct	10 ms	10216 KB	Output is correct
17	Correct	10 ms	10216 KB	Output is correct
18	Correct	10 ms	10216 KB	Output is correct
19	Correct	9 ms	10216 KB	Output is correct
20	Correct	13 ms	10236 KB	Output is correct
21	Correct	11 ms	10240 KB	Output is correct
22	Correct	10 ms	10240 KB	Output is correct
23	Correct	14 ms	10240 KB	Output is correct
24	Correct	10 ms	10240 KB	Output is correct
25	Correct	10 ms	10240 KB	Output is correct
26	Correct	11 ms	10240 KB	Output is correct
27	Incorrect	12 ms	10240 KB	no wires in direction 0 between segments 15 and 15
28	Halted	0 ms	0 KB	-

답안 #63219

Compilation message

Subtask #1 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
0 / 13.0

Subtask #2
0 / 20.0

Subtask #3
0 / 22.0

Subtask #4
0 / 19.0

Subtask #5
0 / 26.0