답안 #63249 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
63249	2018-08-01T07:01:54 Z	윤교준(#1834)	Alternating Current (BOI18_alternating)	C++11	55 / 100	3000 ms	16948 KB

alternating

#include <bits/stdc++.h>
#define rf(x) (x)=0;while(*p<48)p++;while(47<*p)(x)=((x)<<3)+((x)<<1)+(*p++&15);
#define pb push_back
#define eb emplace_back
#define sz(V) ((int)(V).size())
#define befv(V) ((V)[(sz(V)-2)])
#define allv(V) ((V).begin()),((V).end())
#define sorv(V) sort(allv(V))
#define revv(V) reverse(allv(V))
#define univ(V) (V).erase(unique(allv(V)),(V).end())
#define clv(V) (V).clear()
#define upmin(a,b) (a)=min((a),(b))
#define upmax(a,b) (a)=max((a),(b))
#define INF (0x3f3f3f3f)
#define INFLL (0x3f3f3f3f3f3f3f3fll)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
void fuk() { puts("impossible"); exit(0); }

const bool debug = 0;
const int MAXN = 100005;
const int MAXM = 100005;

struct PFS {
	int d[MAXN*2], N;
	void init() { fill(d, d+MAXN*2, 0); }
	void add(int s, int e) { d[s]++; d[e+1]--; }
	bool cal() {
		for(int i = 1; i <= N*2; i++) d[i+1] += d[i];
		for(int i = 1; i <= N; i++)
			if(!(d[i] + d[i+N])) return false;
		return true;
	}
} preA, preB;

vector<int> T[MAXN*2];
vector<int> G[MAXM], CH;
bitset<MAXM> isChild;
int prt[MAXM];

int A[MAXM], B[MAXM];

int Ans[MAXM];
int N, M;

bool isValid() {
	preA.init(); preB.init();
	for(int i = 1; i <= M; i++)
		(Ans[i] ? preA : preB).add(A[i], B[i]);
	return preA.cal() && preB.cal();
}

void dfs(int i, int c) {
	prt[i] = c;
	for(int v : G[i]) if(!prt[v])
		dfs(v, c);
}

int main() {
	ios::sync_with_stdio(false);

	cin >> N >> M;
	preA.N = preB.N = N;
	for(int i = 1; i <= M; i++) {
		cin >> A[i] >> B[i];
		if(A[i] > B[i]) B[i] += N;
		if(B[i]-A[i] == N-1) { A[i] = 1; B[i] = N; }
		T[A[i]].eb(i);
		T[A[i]+N].eb(i);

		if(debug) printf("%d ; %d %d\n", i, A[i], B[i]);
	}

	{
		int ci = -1;
		for(int i = 1; i <= M; i++)
			if(1 == A[i] && B[i] == N)
				ci = i;
		if(0 < ci) {
			for(int i = 1; i <= M; i++) if(i != ci) {
				isChild[i] = true;
				G[ci].eb(i);
			}
		} else {
			/*
			for(int i = 1; i <= M; i++) for(int j = 1; j <= M; j++) {
				if((A[i] <= A[j] && B[j] <= B[i])
					|| (A[i]+N <= A[j] && B[j] <= B[i]+N)
					|| (A[i] <= A[j]+N && B[j]+N <= B[i])) {
					if(A[i] == A[j] && B[i] == B[j]) {
						if(i >= j) continue;
					}
					isChild[j] = true;
					G[i].eb(j);
				}
			}
			*/
			for(int i = 1, st = 0, et = 0, ei = -1; i <= N*2; i++) {
				for(int v : T[i]) {
					int e = i + (B[v]-A[v]);
					if(e <= et) {
						isChild[v] = true;
						G[ei].eb(v);
					}
					else {
						if(st == i) {
							isChild[ei] = true;
							G[v].eb(ei);
						}
						st = i; et = e; ei = v;
					}
				}
			}
		}
	}
	for(int i = 1; i <= M; i++) if(!isChild[i]) CH.eb(i);
	for(int i : CH) dfs(i, i);
	sort(allv(CH), [&](int a, int b) { return A[a] < A[b]; });

	if(debug) {
		for(int v : CH) printf("%d ", v); puts("");
	}

/*
	for(int v : CH) preA.add(A[v], B[v]);
	if(!preA.cal()) fuk();
	preA.init();
*/

	if(sz(CH) & 1) {
		for(int i = 0, n = sz(CH); i < n; i++) {
			for(int j = 0; j < i; j++) Ans[CH[j]] = (i-j-1) & 1;
			for(int j = i; j < n; j++) Ans[CH[j]] = (j-i) & 1;
			for(int j = 1; j <= M; j++) if(isChild[j])
				Ans[j] = !Ans[prt[j]];
			if(isValid()) break;
		}
	} else {
		for(int i = 0, n = sz(CH); i < n; i++)
			Ans[CH[i]] = i & 1;
		for(int i = 1; i <= M; i++) if(isChild[i])
			Ans[i] = !Ans[prt[i]];
	}

	if(!isValid()) fuk();
	for(int i = 1; i <= M; i++) printf("%d", !!Ans[i]);
	puts("");
	return 0;
}

Compilation message

alternating.cpp: In function 'int main()':
alternating.cpp:124:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for(int v : CH) printf("%d ", v); puts("");
   ^~~
alternating.cpp:124:37: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   for(int v : CH) printf("%d ", v); puts("");
                                     ^~~~

Subtask #1
13.0 / 13.0

#	결과	실행 시간	메모리	Grader output
1	Correct	11 ms	8952 KB	Output is correct
2	Correct	13 ms	9064 KB	Output is correct
3	Correct	13 ms	9064 KB	Output is correct
4	Correct	16 ms	9112 KB	Output is correct
5	Correct	12 ms	9112 KB	Output is correct
6	Correct	11 ms	9112 KB	Output is correct
7	Correct	12 ms	9112 KB	Output is correct
8	Correct	13 ms	9248 KB	Output is correct
9	Correct	13 ms	9248 KB	Output is correct
10	Correct	13 ms	9256 KB	Output is correct
11	Correct	12 ms	9256 KB	Output is correct
12	Correct	11 ms	9256 KB	Output is correct
13	Correct	9 ms	9256 KB	Output is correct
14	Correct	14 ms	9256 KB	Output is correct
15	Correct	13 ms	9324 KB	Output is correct
16	Correct	10 ms	9324 KB	Output is correct
17	Correct	13 ms	9324 KB	Output is correct
18	Correct	11 ms	9324 KB	Output is correct
19	Correct	13 ms	9324 KB	Output is correct
20	Correct	10 ms	9324 KB	Output is correct
21	Correct	10 ms	9324 KB	Output is correct
22	Correct	9 ms	9324 KB	Output is correct
23	Correct	13 ms	9324 KB	Output is correct
24	Correct	11 ms	9324 KB	Output is correct
25	Correct	9 ms	9324 KB	Output is correct
26	Correct	11 ms	9324 KB	Output is correct
27	Correct	10 ms	9324 KB	Output is correct
28	Correct	10 ms	9324 KB	Output is correct
29	Correct	12 ms	9324 KB	Output is correct
30	Correct	12 ms	9324 KB	Output is correct
31	Correct	10 ms	9324 KB	Output is correct
32	Correct	10 ms	9324 KB	Output is correct
33	Correct	10 ms	9324 KB	Output is correct
34	Correct	10 ms	9324 KB	Output is correct
35	Correct	10 ms	9324 KB	Output is correct
36	Correct	10 ms	9324 KB	Output is correct
37	Correct	11 ms	9324 KB	Output is correct
38	Correct	11 ms	9324 KB	Output is correct
39	Correct	11 ms	9324 KB	Output is correct
40	Correct	10 ms	9324 KB	Output is correct

Subtask #2
20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	11 ms	8952 KB	Output is correct
2	Correct	13 ms	9064 KB	Output is correct
3	Correct	13 ms	9064 KB	Output is correct
4	Correct	16 ms	9112 KB	Output is correct
5	Correct	12 ms	9112 KB	Output is correct
6	Correct	11 ms	9112 KB	Output is correct
7	Correct	12 ms	9112 KB	Output is correct
8	Correct	13 ms	9248 KB	Output is correct
9	Correct	13 ms	9248 KB	Output is correct
10	Correct	13 ms	9256 KB	Output is correct
11	Correct	12 ms	9256 KB	Output is correct
12	Correct	11 ms	9256 KB	Output is correct
13	Correct	9 ms	9256 KB	Output is correct
14	Correct	14 ms	9256 KB	Output is correct
15	Correct	13 ms	9324 KB	Output is correct
16	Correct	10 ms	9324 KB	Output is correct
17	Correct	13 ms	9324 KB	Output is correct
18	Correct	11 ms	9324 KB	Output is correct
19	Correct	13 ms	9324 KB	Output is correct
20	Correct	10 ms	9324 KB	Output is correct
21	Correct	10 ms	9324 KB	Output is correct
22	Correct	9 ms	9324 KB	Output is correct
23	Correct	13 ms	9324 KB	Output is correct
24	Correct	11 ms	9324 KB	Output is correct
25	Correct	9 ms	9324 KB	Output is correct
26	Correct	11 ms	9324 KB	Output is correct
27	Correct	10 ms	9324 KB	Output is correct
28	Correct	10 ms	9324 KB	Output is correct
29	Correct	12 ms	9324 KB	Output is correct
30	Correct	12 ms	9324 KB	Output is correct
31	Correct	10 ms	9324 KB	Output is correct
32	Correct	10 ms	9324 KB	Output is correct
33	Correct	10 ms	9324 KB	Output is correct
34	Correct	10 ms	9324 KB	Output is correct
35	Correct	10 ms	9324 KB	Output is correct
36	Correct	10 ms	9324 KB	Output is correct
37	Correct	11 ms	9324 KB	Output is correct
38	Correct	11 ms	9324 KB	Output is correct
39	Correct	11 ms	9324 KB	Output is correct
40	Correct	10 ms	9324 KB	Output is correct
41	Correct	10 ms	9324 KB	Output is correct
42	Correct	14 ms	9324 KB	Output is correct
43	Correct	11 ms	9324 KB	Output is correct
44	Correct	13 ms	9324 KB	Output is correct
45	Correct	12 ms	9324 KB	Output is correct
46	Correct	10 ms	9324 KB	Output is correct
47	Correct	12 ms	9324 KB	Output is correct
48	Correct	11 ms	9324 KB	Output is correct
49	Correct	12 ms	9324 KB	Output is correct
50	Correct	11 ms	9324 KB	Output is correct
51	Correct	13 ms	9324 KB	Output is correct
52	Correct	11 ms	9324 KB	Output is correct
53	Correct	24 ms	9324 KB	Output is correct
54	Correct	12 ms	9324 KB	Output is correct
55	Correct	11 ms	9324 KB	Output is correct
56	Correct	13 ms	9324 KB	Output is correct
57	Correct	12 ms	9324 KB	Output is correct
58	Correct	12 ms	9324 KB	Output is correct
59	Correct	13 ms	9324 KB	Output is correct
60	Correct	13 ms	9324 KB	Output is correct
61	Correct	12 ms	9324 KB	Output is correct
62	Correct	12 ms	9324 KB	Output is correct
63	Correct	23 ms	9324 KB	Output is correct
64	Correct	12 ms	9324 KB	Output is correct
65	Correct	12 ms	9324 KB	Output is correct
66	Correct	15 ms	9340 KB	Output is correct
67	Correct	12 ms	9340 KB	Output is correct
68	Correct	11 ms	9340 KB	Output is correct
69	Correct	11 ms	9340 KB	Output is correct

Subtask #3
22.0 / 22.0

#	결과	실행 시간	메모리	Grader output
1	Correct	11 ms	8952 KB	Output is correct
2	Correct	13 ms	9064 KB	Output is correct
3	Correct	13 ms	9064 KB	Output is correct
4	Correct	16 ms	9112 KB	Output is correct
5	Correct	12 ms	9112 KB	Output is correct
6	Correct	11 ms	9112 KB	Output is correct
7	Correct	12 ms	9112 KB	Output is correct
8	Correct	13 ms	9248 KB	Output is correct
9	Correct	13 ms	9248 KB	Output is correct
10	Correct	13 ms	9256 KB	Output is correct
11	Correct	12 ms	9256 KB	Output is correct
12	Correct	11 ms	9256 KB	Output is correct
13	Correct	9 ms	9256 KB	Output is correct
14	Correct	14 ms	9256 KB	Output is correct
15	Correct	13 ms	9324 KB	Output is correct
16	Correct	10 ms	9324 KB	Output is correct
17	Correct	13 ms	9324 KB	Output is correct
18	Correct	11 ms	9324 KB	Output is correct
19	Correct	13 ms	9324 KB	Output is correct
20	Correct	10 ms	9324 KB	Output is correct
21	Correct	10 ms	9324 KB	Output is correct
22	Correct	9 ms	9324 KB	Output is correct
23	Correct	13 ms	9324 KB	Output is correct
24	Correct	11 ms	9324 KB	Output is correct
25	Correct	9 ms	9324 KB	Output is correct
26	Correct	11 ms	9324 KB	Output is correct
27	Correct	10 ms	9324 KB	Output is correct
28	Correct	10 ms	9324 KB	Output is correct
29	Correct	12 ms	9324 KB	Output is correct
30	Correct	12 ms	9324 KB	Output is correct
31	Correct	10 ms	9324 KB	Output is correct
32	Correct	10 ms	9324 KB	Output is correct
33	Correct	10 ms	9324 KB	Output is correct
34	Correct	10 ms	9324 KB	Output is correct
35	Correct	10 ms	9324 KB	Output is correct
36	Correct	10 ms	9324 KB	Output is correct
37	Correct	11 ms	9324 KB	Output is correct
38	Correct	11 ms	9324 KB	Output is correct
39	Correct	11 ms	9324 KB	Output is correct
40	Correct	10 ms	9324 KB	Output is correct
41	Correct	10 ms	9324 KB	Output is correct
42	Correct	14 ms	9324 KB	Output is correct
43	Correct	11 ms	9324 KB	Output is correct
44	Correct	13 ms	9324 KB	Output is correct
45	Correct	12 ms	9324 KB	Output is correct
46	Correct	10 ms	9324 KB	Output is correct
47	Correct	12 ms	9324 KB	Output is correct
48	Correct	11 ms	9324 KB	Output is correct
49	Correct	12 ms	9324 KB	Output is correct
50	Correct	11 ms	9324 KB	Output is correct
51	Correct	13 ms	9324 KB	Output is correct
52	Correct	11 ms	9324 KB	Output is correct
53	Correct	24 ms	9324 KB	Output is correct
54	Correct	12 ms	9324 KB	Output is correct
55	Correct	11 ms	9324 KB	Output is correct
56	Correct	13 ms	9324 KB	Output is correct
57	Correct	12 ms	9324 KB	Output is correct
58	Correct	12 ms	9324 KB	Output is correct
59	Correct	13 ms	9324 KB	Output is correct
60	Correct	13 ms	9324 KB	Output is correct
61	Correct	12 ms	9324 KB	Output is correct
62	Correct	12 ms	9324 KB	Output is correct
63	Correct	23 ms	9324 KB	Output is correct
64	Correct	12 ms	9324 KB	Output is correct
65	Correct	12 ms	9324 KB	Output is correct
66	Correct	15 ms	9340 KB	Output is correct
67	Correct	12 ms	9340 KB	Output is correct
68	Correct	11 ms	9340 KB	Output is correct
69	Correct	11 ms	9340 KB	Output is correct
70	Correct	10 ms	9340 KB	Output is correct
71	Correct	222 ms	9340 KB	Output is correct
72	Correct	16 ms	9340 KB	Output is correct
73	Correct	10 ms	9340 KB	Output is correct
74	Correct	12 ms	9340 KB	Output is correct
75	Correct	10 ms	9340 KB	Output is correct
76	Correct	12 ms	9340 KB	Output is correct
77	Correct	12 ms	9368 KB	Output is correct
78	Correct	29 ms	9368 KB	Output is correct
79	Correct	11 ms	9368 KB	Output is correct
80	Correct	11 ms	9368 KB	Output is correct
81	Correct	11 ms	9368 KB	Output is correct
82	Correct	12 ms	9368 KB	Output is correct
83	Correct	11 ms	9368 KB	Output is correct
84	Correct	12 ms	9368 KB	Output is correct
85	Correct	14 ms	9368 KB	Output is correct
86	Correct	11 ms	9368 KB	Output is correct
87	Correct	15 ms	9368 KB	Output is correct
88	Correct	11 ms	9368 KB	Output is correct
89	Correct	166 ms	9368 KB	Output is correct
90	Correct	13 ms	9368 KB	Output is correct
91	Correct	12 ms	9368 KB	Output is correct
92	Correct	13 ms	9368 KB	Output is correct
93	Correct	13 ms	9368 KB	Output is correct
94	Correct	11 ms	9368 KB	Output is correct
95	Correct	12 ms	9368 KB	Output is correct
96	Correct	12 ms	9368 KB	Output is correct
97	Correct	14 ms	9368 KB	Output is correct
98	Correct	9 ms	9368 KB	Output is correct

Subtask #4
0 / 19.0

#	결과	실행 시간	메모리	Grader output
1	Correct	50 ms	12144 KB	Output is correct
2	Correct	11 ms	12144 KB	Output is correct
3	Correct	33 ms	13432 KB	Output is correct
4	Correct	37 ms	13560 KB	Output is correct
5	Correct	128 ms	16948 KB	Output is correct
6	Execution timed out	3058 ms	16948 KB	Time limit exceeded
7	Halted	0 ms	0 KB	-

Subtask #5
0 / 26.0

#	결과	실행 시간	메모리	Grader output
1	Correct	11 ms	8952 KB	Output is correct
2	Correct	13 ms	9064 KB	Output is correct
3	Correct	13 ms	9064 KB	Output is correct
4	Correct	16 ms	9112 KB	Output is correct
5	Correct	12 ms	9112 KB	Output is correct
6	Correct	11 ms	9112 KB	Output is correct
7	Correct	12 ms	9112 KB	Output is correct
8	Correct	13 ms	9248 KB	Output is correct
9	Correct	13 ms	9248 KB	Output is correct
10	Correct	13 ms	9256 KB	Output is correct
11	Correct	12 ms	9256 KB	Output is correct
12	Correct	11 ms	9256 KB	Output is correct
13	Correct	9 ms	9256 KB	Output is correct
14	Correct	14 ms	9256 KB	Output is correct
15	Correct	13 ms	9324 KB	Output is correct
16	Correct	10 ms	9324 KB	Output is correct
17	Correct	13 ms	9324 KB	Output is correct
18	Correct	11 ms	9324 KB	Output is correct
19	Correct	13 ms	9324 KB	Output is correct
20	Correct	10 ms	9324 KB	Output is correct
21	Correct	10 ms	9324 KB	Output is correct
22	Correct	9 ms	9324 KB	Output is correct
23	Correct	13 ms	9324 KB	Output is correct
24	Correct	11 ms	9324 KB	Output is correct
25	Correct	9 ms	9324 KB	Output is correct
26	Correct	11 ms	9324 KB	Output is correct
27	Correct	10 ms	9324 KB	Output is correct
28	Correct	10 ms	9324 KB	Output is correct
29	Correct	12 ms	9324 KB	Output is correct
30	Correct	12 ms	9324 KB	Output is correct
31	Correct	10 ms	9324 KB	Output is correct
32	Correct	10 ms	9324 KB	Output is correct
33	Correct	10 ms	9324 KB	Output is correct
34	Correct	10 ms	9324 KB	Output is correct
35	Correct	10 ms	9324 KB	Output is correct
36	Correct	10 ms	9324 KB	Output is correct
37	Correct	11 ms	9324 KB	Output is correct
38	Correct	11 ms	9324 KB	Output is correct
39	Correct	11 ms	9324 KB	Output is correct
40	Correct	10 ms	9324 KB	Output is correct
41	Correct	10 ms	9324 KB	Output is correct
42	Correct	14 ms	9324 KB	Output is correct
43	Correct	11 ms	9324 KB	Output is correct
44	Correct	13 ms	9324 KB	Output is correct
45	Correct	12 ms	9324 KB	Output is correct
46	Correct	10 ms	9324 KB	Output is correct
47	Correct	12 ms	9324 KB	Output is correct
48	Correct	11 ms	9324 KB	Output is correct
49	Correct	12 ms	9324 KB	Output is correct
50	Correct	11 ms	9324 KB	Output is correct
51	Correct	13 ms	9324 KB	Output is correct
52	Correct	11 ms	9324 KB	Output is correct
53	Correct	24 ms	9324 KB	Output is correct
54	Correct	12 ms	9324 KB	Output is correct
55	Correct	11 ms	9324 KB	Output is correct
56	Correct	13 ms	9324 KB	Output is correct
57	Correct	12 ms	9324 KB	Output is correct
58	Correct	12 ms	9324 KB	Output is correct
59	Correct	13 ms	9324 KB	Output is correct
60	Correct	13 ms	9324 KB	Output is correct
61	Correct	12 ms	9324 KB	Output is correct
62	Correct	12 ms	9324 KB	Output is correct
63	Correct	23 ms	9324 KB	Output is correct
64	Correct	12 ms	9324 KB	Output is correct
65	Correct	12 ms	9324 KB	Output is correct
66	Correct	15 ms	9340 KB	Output is correct
67	Correct	12 ms	9340 KB	Output is correct
68	Correct	11 ms	9340 KB	Output is correct
69	Correct	11 ms	9340 KB	Output is correct
70	Correct	10 ms	9340 KB	Output is correct
71	Correct	222 ms	9340 KB	Output is correct
72	Correct	16 ms	9340 KB	Output is correct
73	Correct	10 ms	9340 KB	Output is correct
74	Correct	12 ms	9340 KB	Output is correct
75	Correct	10 ms	9340 KB	Output is correct
76	Correct	12 ms	9340 KB	Output is correct
77	Correct	12 ms	9368 KB	Output is correct
78	Correct	29 ms	9368 KB	Output is correct
79	Correct	11 ms	9368 KB	Output is correct
80	Correct	11 ms	9368 KB	Output is correct
81	Correct	11 ms	9368 KB	Output is correct
82	Correct	12 ms	9368 KB	Output is correct
83	Correct	11 ms	9368 KB	Output is correct
84	Correct	12 ms	9368 KB	Output is correct
85	Correct	14 ms	9368 KB	Output is correct
86	Correct	11 ms	9368 KB	Output is correct
87	Correct	15 ms	9368 KB	Output is correct
88	Correct	11 ms	9368 KB	Output is correct
89	Correct	166 ms	9368 KB	Output is correct
90	Correct	13 ms	9368 KB	Output is correct
91	Correct	12 ms	9368 KB	Output is correct
92	Correct	13 ms	9368 KB	Output is correct
93	Correct	13 ms	9368 KB	Output is correct
94	Correct	11 ms	9368 KB	Output is correct
95	Correct	12 ms	9368 KB	Output is correct
96	Correct	12 ms	9368 KB	Output is correct
97	Correct	14 ms	9368 KB	Output is correct
98	Correct	9 ms	9368 KB	Output is correct
99	Correct	50 ms	12144 KB	Output is correct
100	Correct	11 ms	12144 KB	Output is correct
101	Correct	33 ms	13432 KB	Output is correct
102	Correct	37 ms	13560 KB	Output is correct
103	Correct	128 ms	16948 KB	Output is correct
104	Execution timed out	3058 ms	16948 KB	Time limit exceeded
105	Halted	0 ms	0 KB	-

답안 #63249

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