oj.uz

Submission #63247

# Submission time Handle Problem Language Result Execution time Memory
63247 2018-08-01T06:58:51 Z 윤교준(#1834) Alternating Current (BOI18_alternating) C++11
55 / 100
 3000 ms 13644 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) uf(ei, v);
					else {
						if(st == i) uf(v, 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:118:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for(int v : CH) printf("%d ", v); puts("");
   ^~~
alternating.cpp:118:37: 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 10 ms 8952 KB Output is correct
2 Correct 10 ms 9140 KB Output is correct
3 Correct 10 ms 9140 KB Output is correct
4 Correct 14 ms 9140 KB Output is correct
5 Correct 10 ms 9140 KB Output is correct
6 Correct 11 ms 9140 KB Output is correct
7 Correct 10 ms 9140 KB Output is correct
8 Correct 10 ms 9140 KB Output is correct
9 Correct 9 ms 9172 KB Output is correct
10 Correct 12 ms 9212 KB Output is correct
11 Correct 10 ms 9256 KB Output is correct
12 Correct 11 ms 9256 KB Output is correct
13 Correct 10 ms 9256 KB Output is correct
14 Correct 10 ms 9260 KB Output is correct
15 Correct 12 ms 9260 KB Output is correct
16 Correct 12 ms 9260 KB Output is correct
17 Correct 34 ms 9260 KB Output is correct
18 Correct 12 ms 9260 KB Output is correct
19 Correct 12 ms 9260 KB Output is correct
20 Correct 12 ms 9260 KB Output is correct
21 Correct 13 ms 9260 KB Output is correct
22 Correct 10 ms 9260 KB Output is correct
23 Correct 12 ms 9260 KB Output is correct
24 Correct 14 ms 9260 KB Output is correct
25 Correct 13 ms 9260 KB Output is correct
26 Correct 11 ms 9260 KB Output is correct
27 Correct 10 ms 9260 KB Output is correct
28 Correct 12 ms 9260 KB Output is correct
29 Correct 10 ms 9260 KB Output is correct
30 Correct 14 ms 9260 KB Output is correct
31 Correct 13 ms 9260 KB Output is correct
32 Correct 11 ms 9260 KB Output is correct
33 Correct 12 ms 9260 KB Output is correct
34 Correct 13 ms 9260 KB Output is correct
35 Correct 11 ms 9260 KB Output is correct
36 Correct 10 ms 9260 KB Output is correct
37 Correct 14 ms 9260 KB Output is correct
38 Correct 15 ms 9324 KB Output is correct
39 Correct 11 ms 9324 KB Output is correct
40 Correct 12 ms 9324 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 8952 KB Output is correct
2 Correct 10 ms 9140 KB Output is correct
3 Correct 10 ms 9140 KB Output is correct
4 Correct 14 ms 9140 KB Output is correct
5 Correct 10 ms 9140 KB Output is correct
6 Correct 11 ms 9140 KB Output is correct
7 Correct 10 ms 9140 KB Output is correct
8 Correct 10 ms 9140 KB Output is correct
9 Correct 9 ms 9172 KB Output is correct
10 Correct 12 ms 9212 KB Output is correct
11 Correct 10 ms 9256 KB Output is correct
12 Correct 11 ms 9256 KB Output is correct
13 Correct 10 ms 9256 KB Output is correct
14 Correct 10 ms 9260 KB Output is correct
15 Correct 12 ms 9260 KB Output is correct
16 Correct 12 ms 9260 KB Output is correct
17 Correct 34 ms 9260 KB Output is correct
18 Correct 12 ms 9260 KB Output is correct
19 Correct 12 ms 9260 KB Output is correct
20 Correct 12 ms 9260 KB Output is correct
21 Correct 13 ms 9260 KB Output is correct
22 Correct 10 ms 9260 KB Output is correct
23 Correct 12 ms 9260 KB Output is correct
24 Correct 14 ms 9260 KB Output is correct
25 Correct 13 ms 9260 KB Output is correct
26 Correct 11 ms 9260 KB Output is correct
27 Correct 10 ms 9260 KB Output is correct
28 Correct 12 ms 9260 KB Output is correct
29 Correct 10 ms 9260 KB Output is correct
30 Correct 14 ms 9260 KB Output is correct
31 Correct 13 ms 9260 KB Output is correct
32 Correct 11 ms 9260 KB Output is correct
33 Correct 12 ms 9260 KB Output is correct
34 Correct 13 ms 9260 KB Output is correct
35 Correct 11 ms 9260 KB Output is correct
36 Correct 10 ms 9260 KB Output is correct
37 Correct 14 ms 9260 KB Output is correct
38 Correct 15 ms 9324 KB Output is correct
39 Correct 11 ms 9324 KB Output is correct
40 Correct 12 ms 9324 KB Output is correct
41 Correct 12 ms 9324 KB Output is correct
42 Correct 15 ms 9324 KB Output is correct
43 Correct 10 ms 9324 KB Output is correct
44 Correct 11 ms 9324 KB Output is correct
45 Correct 12 ms 9324 KB Output is correct
46 Correct 11 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 11 ms 9324 KB Output is correct
50 Correct 14 ms 9324 KB Output is correct
51 Correct 13 ms 9324 KB Output is correct
52 Correct 14 ms 9324 KB Output is correct
53 Correct 21 ms 9324 KB Output is correct
54 Correct 12 ms 9324 KB Output is correct
55 Correct 13 ms 9324 KB Output is correct
56 Correct 12 ms 9324 KB Output is correct
57 Correct 11 ms 9324 KB Output is correct
58 Correct 13 ms 9340 KB Output is correct
59 Correct 10 ms 9340 KB Output is correct
60 Correct 10 ms 9340 KB Output is correct
61 Correct 12 ms 9340 KB Output is correct
62 Correct 17 ms 9340 KB Output is correct
63 Correct 25 ms 9340 KB Output is correct
64 Correct 12 ms 9340 KB Output is correct
65 Correct 10 ms 9340 KB Output is correct
66 Correct 12 ms 9340 KB Output is correct
67 Correct 13 ms 9340 KB Output is correct
68 Correct 12 ms 9340 KB Output is correct
69 Correct 13 ms 9340 KB Output is correct

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 8952 KB Output is correct
2 Correct 10 ms 9140 KB Output is correct
3 Correct 10 ms 9140 KB Output is correct
4 Correct 14 ms 9140 KB Output is correct
5 Correct 10 ms 9140 KB Output is correct
6 Correct 11 ms 9140 KB Output is correct
7 Correct 10 ms 9140 KB Output is correct
8 Correct 10 ms 9140 KB Output is correct
9 Correct 9 ms 9172 KB Output is correct
10 Correct 12 ms 9212 KB Output is correct
11 Correct 10 ms 9256 KB Output is correct
12 Correct 11 ms 9256 KB Output is correct
13 Correct 10 ms 9256 KB Output is correct
14 Correct 10 ms 9260 KB Output is correct
15 Correct 12 ms 9260 KB Output is correct
16 Correct 12 ms 9260 KB Output is correct
17 Correct 34 ms 9260 KB Output is correct
18 Correct 12 ms 9260 KB Output is correct
19 Correct 12 ms 9260 KB Output is correct
20 Correct 12 ms 9260 KB Output is correct
21 Correct 13 ms 9260 KB Output is correct
22 Correct 10 ms 9260 KB Output is correct
23 Correct 12 ms 9260 KB Output is correct
24 Correct 14 ms 9260 KB Output is correct
25 Correct 13 ms 9260 KB Output is correct
26 Correct 11 ms 9260 KB Output is correct
27 Correct 10 ms 9260 KB Output is correct
28 Correct 12 ms 9260 KB Output is correct
29 Correct 10 ms 9260 KB Output is correct
30 Correct 14 ms 9260 KB Output is correct
31 Correct 13 ms 9260 KB Output is correct
32 Correct 11 ms 9260 KB Output is correct
33 Correct 12 ms 9260 KB Output is correct
34 Correct 13 ms 9260 KB Output is correct
35 Correct 11 ms 9260 KB Output is correct
36 Correct 10 ms 9260 KB Output is correct
37 Correct 14 ms 9260 KB Output is correct
38 Correct 15 ms 9324 KB Output is correct
39 Correct 11 ms 9324 KB Output is correct
40 Correct 12 ms 9324 KB Output is correct
41 Correct 12 ms 9324 KB Output is correct
42 Correct 15 ms 9324 KB Output is correct
43 Correct 10 ms 9324 KB Output is correct
44 Correct 11 ms 9324 KB Output is correct
45 Correct 12 ms 9324 KB Output is correct
46 Correct 11 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 11 ms 9324 KB Output is correct
50 Correct 14 ms 9324 KB Output is correct
51 Correct 13 ms 9324 KB Output is correct
52 Correct 14 ms 9324 KB Output is correct
53 Correct 21 ms 9324 KB Output is correct
54 Correct 12 ms 9324 KB Output is correct
55 Correct 13 ms 9324 KB Output is correct
56 Correct 12 ms 9324 KB Output is correct
57 Correct 11 ms 9324 KB Output is correct
58 Correct 13 ms 9340 KB Output is correct
59 Correct 10 ms 9340 KB Output is correct
60 Correct 10 ms 9340 KB Output is correct
61 Correct 12 ms 9340 KB Output is correct
62 Correct 17 ms 9340 KB Output is correct
63 Correct 25 ms 9340 KB Output is correct
64 Correct 12 ms 9340 KB Output is correct
65 Correct 10 ms 9340 KB Output is correct
66 Correct 12 ms 9340 KB Output is correct
67 Correct 13 ms 9340 KB Output is correct
68 Correct 12 ms 9340 KB Output is correct
69 Correct 13 ms 9340 KB Output is correct
70 Correct 11 ms 9340 KB Output is correct
71 Correct 259 ms 9340 KB Output is correct
72 Correct 21 ms 9340 KB Output is correct
73 Correct 11 ms 9340 KB Output is correct
74 Correct 13 ms 9340 KB Output is correct
75 Correct 12 ms 9340 KB Output is correct
76 Correct 10 ms 9340 KB Output is correct
77 Correct 13 ms 9340 KB Output is correct
78 Correct 28 ms 9340 KB Output is correct
79 Correct 14 ms 9340 KB Output is correct
80 Correct 21 ms 9416 KB Output is correct
81 Correct 12 ms 9416 KB Output is correct
82 Correct 11 ms 9416 KB Output is correct
83 Correct 19 ms 9416 KB Output is correct
84 Correct 17 ms 9416 KB Output is correct
85 Correct 10 ms 9416 KB Output is correct
86 Correct 14 ms 9416 KB Output is correct
87 Correct 16 ms 9416 KB Output is correct
88 Correct 13 ms 9416 KB Output is correct
89 Correct 153 ms 9416 KB Output is correct
90 Correct 23 ms 10284 KB Output is correct
91 Correct 13 ms 10284 KB Output is correct
92 Correct 11 ms 10284 KB Output is correct
93 Correct 13 ms 10284 KB Output is correct
94 Correct 12 ms 10284 KB Output is correct
95 Correct 12 ms 10284 KB Output is correct
96 Correct 22 ms 10284 KB Output is correct
97 Correct 23 ms 10284 KB Output is correct
98 Correct 15 ms 10284 KB Output is correct

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 53 ms 12344 KB Output is correct
2 Correct 10 ms 12344 KB Output is correct
3 Correct 38 ms 13516 KB Output is correct
4 Correct 38 ms 13644 KB Output is correct
5 Execution timed out 3028 ms 13644 KB Time limit exceeded
6 Halted 0 ms 0 KB -

Subtask #5
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 8952 KB Output is correct
2 Correct 10 ms 9140 KB Output is correct
3 Correct 10 ms 9140 KB Output is correct
4 Correct 14 ms 9140 KB Output is correct
5 Correct 10 ms 9140 KB Output is correct
6 Correct 11 ms 9140 KB Output is correct
7 Correct 10 ms 9140 KB Output is correct
8 Correct 10 ms 9140 KB Output is correct
9 Correct 9 ms 9172 KB Output is correct
10 Correct 12 ms 9212 KB Output is correct
11 Correct 10 ms 9256 KB Output is correct
12 Correct 11 ms 9256 KB Output is correct
13 Correct 10 ms 9256 KB Output is correct
14 Correct 10 ms 9260 KB Output is correct
15 Correct 12 ms 9260 KB Output is correct
16 Correct 12 ms 9260 KB Output is correct
17 Correct 34 ms 9260 KB Output is correct
18 Correct 12 ms 9260 KB Output is correct
19 Correct 12 ms 9260 KB Output is correct
20 Correct 12 ms 9260 KB Output is correct
21 Correct 13 ms 9260 KB Output is correct
22 Correct 10 ms 9260 KB Output is correct
23 Correct 12 ms 9260 KB Output is correct
24 Correct 14 ms 9260 KB Output is correct
25 Correct 13 ms 9260 KB Output is correct
26 Correct 11 ms 9260 KB Output is correct
27 Correct 10 ms 9260 KB Output is correct
28 Correct 12 ms 9260 KB Output is correct
29 Correct 10 ms 9260 KB Output is correct
30 Correct 14 ms 9260 KB Output is correct
31 Correct 13 ms 9260 KB Output is correct
32 Correct 11 ms 9260 KB Output is correct
33 Correct 12 ms 9260 KB Output is correct
34 Correct 13 ms 9260 KB Output is correct
35 Correct 11 ms 9260 KB Output is correct
36 Correct 10 ms 9260 KB Output is correct
37 Correct 14 ms 9260 KB Output is correct
38 Correct 15 ms 9324 KB Output is correct
39 Correct 11 ms 9324 KB Output is correct
40 Correct 12 ms 9324 KB Output is correct
41 Correct 12 ms 9324 KB Output is correct
42 Correct 15 ms 9324 KB Output is correct
43 Correct 10 ms 9324 KB Output is correct
44 Correct 11 ms 9324 KB Output is correct
45 Correct 12 ms 9324 KB Output is correct
46 Correct 11 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 11 ms 9324 KB Output is correct
50 Correct 14 ms 9324 KB Output is correct
51 Correct 13 ms 9324 KB Output is correct
52 Correct 14 ms 9324 KB Output is correct
53 Correct 21 ms 9324 KB Output is correct
54 Correct 12 ms 9324 KB Output is correct
55 Correct 13 ms 9324 KB Output is correct
56 Correct 12 ms 9324 KB Output is correct
57 Correct 11 ms 9324 KB Output is correct
58 Correct 13 ms 9340 KB Output is correct
59 Correct 10 ms 9340 KB Output is correct
60 Correct 10 ms 9340 KB Output is correct
61 Correct 12 ms 9340 KB Output is correct
62 Correct 17 ms 9340 KB Output is correct
63 Correct 25 ms 9340 KB Output is correct
64 Correct 12 ms 9340 KB Output is correct
65 Correct 10 ms 9340 KB Output is correct
66 Correct 12 ms 9340 KB Output is correct
67 Correct 13 ms 9340 KB Output is correct
68 Correct 12 ms 9340 KB Output is correct
69 Correct 13 ms 9340 KB Output is correct
70 Correct 11 ms 9340 KB Output is correct
71 Correct 259 ms 9340 KB Output is correct
72 Correct 21 ms 9340 KB Output is correct
73 Correct 11 ms 9340 KB Output is correct
74 Correct 13 ms 9340 KB Output is correct
75 Correct 12 ms 9340 KB Output is correct
76 Correct 10 ms 9340 KB Output is correct
77 Correct 13 ms 9340 KB Output is correct
78 Correct 28 ms 9340 KB Output is correct
79 Correct 14 ms 9340 KB Output is correct
80 Correct 21 ms 9416 KB Output is correct
81 Correct 12 ms 9416 KB Output is correct
82 Correct 11 ms 9416 KB Output is correct
83 Correct 19 ms 9416 KB Output is correct
84 Correct 17 ms 9416 KB Output is correct
85 Correct 10 ms 9416 KB Output is correct
86 Correct 14 ms 9416 KB Output is correct
87 Correct 16 ms 9416 KB Output is correct
88 Correct 13 ms 9416 KB Output is correct
89 Correct 153 ms 9416 KB Output is correct
90 Correct 23 ms 10284 KB Output is correct
91 Correct 13 ms 10284 KB Output is correct
92 Correct 11 ms 10284 KB Output is correct
93 Correct 13 ms 10284 KB Output is correct
94 Correct 12 ms 10284 KB Output is correct
95 Correct 12 ms 10284 KB Output is correct
96 Correct 22 ms 10284 KB Output is correct
97 Correct 23 ms 10284 KB Output is correct
98 Correct 15 ms 10284 KB Output is correct
99 Correct 53 ms 12344 KB Output is correct
100 Correct 10 ms 12344 KB Output is correct
101 Correct 38 ms 13516 KB Output is correct
102 Correct 38 ms 13644 KB Output is correct
103 Execution timed out 3028 ms 13644 KB Time limit exceeded
104 Halted 0 ms 0 KB -