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Submission #63249

# Submission time Handle Problem Language Result Execution time Memory
63249 2018-08-01T07:01:54 Z 윤교준(#1834) Alternating Current (BOI18_alternating) C++11
55 / 100
 3000 ms 16948 KB 
#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

# Verdict Execution time Memory 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

# Verdict Execution time Memory 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

# Verdict Execution time Memory 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

# Verdict Execution time Memory 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

# Verdict Execution time Memory 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 -