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Submission #106153

# Submission time Handle Problem Language Result Execution time Memory
106153 2019-04-16T21:28:53 Z Noam527 Alternating Current (BOI18_alternating) C++17
32 / 100
 165 ms 16368 KB 
#include <bits/stdc++.h>
#define CHECK cout << "ok" << endl
#define finish(x) return cout << x << endl, 0
typedef long long ll;
typedef long double ldb;
const int md = 1e9 + 7;
const ll inf = 1e18;
const int OO = 0;
const int OOO = 1;
using namespace std;

struct edge {
	int to, i;
	edge(int tt = 0, int ii = 0) : to(tt), i(ii) {}
};

int n, m;
int C[100005] = {};
int dp[200005], to[200005];
int range[200005] = {};

vector<edge> g[200005];
vector<int> vis; int nxtcol = 5;
vector<int> path;

string ans;

void add(int l, int r) {
	C[l]++;
	C[r + 1]--;
}
void pre() {
	for (int i = 1; i <= n; i++) C[i] += C[i - 1];
	for (int i = 1; i <= n; i++) {
		if (C[i] == 1) {
			cout << "impossible\n";
			exit(0);
		}
		C[i] = max(0, min(1, C[i] - 2));
		if (C[i]) {
			if (OO) {
				cout << "from C adding " << i << " " << i - 1 << '\n';
			}
			g[i].push_back(edge(i - 1, -1));
			g[i + n].push_back(edge(i - 1 + n, -1));
		}
	}
}

bool dfs(int v, int tar) {
	if (OO) {
		cout << "dfsing " << v << " tar " << tar << '\n';
	}
	if (v == tar) return true;
	if (vis[v % n] == nxtcol) return false;
	vis[v % n] = nxtcol;
	for (const auto &i : g[v]) {
		path.push_back(i.i);
		if (dfs(i.to, tar)) return true;
		path.pop_back();
	}
	return false;
}

bool check(int v) {
	if (OO) {
		cout << "starting check on " << v << '\n';
	}
	nxtcol++;
	for (const auto &i : g[v]) {
		if (i.to != v - 1) {
			path.push_back(i.i);
			if (dfs(i.to, v + n)) return true;
			path.pop_back();
		}
	}
	return false;
}

int main() {
	ios::sync_with_stdio(0), cin.tie(0);
	cin >> n >> m;
	for (int i = 0, l, r; i < m; i++) {
		cin >> l >> r;
		if (l > r) {
			add(l, n);
			add(1, r);
			l--;
			r += n;
			if (OO) cout << "from input adding " << l << " " << r << '\n';
			g[l].push_back(edge(r, i));
			g[l + n].push_back(edge(2 * n, i));
		}
		else {
			add(l, r);
			l--;
			if (OO) cout << "from input adding " << l << " " << r << '\n';
			g[l].push_back(edge(r, i));
			g[l + n].push_back(edge(r + n, i));
		}
	}
	pre();

	ans.resize(m, '1');
	vis.resize(n, 0);

	for (int i = n - 1; i >= 0; i--) {
		if (check(i)) {
			for (const auto &j : path)
				if (j != -1) ans[j] = '0';
			finish(ans);
		}
	}
	finish("impossible");
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 7 ms 5120 KB Output is correct
3 Correct 6 ms 5120 KB Output is correct
4 Correct 6 ms 4992 KB Output is correct
5 Correct 5 ms 4992 KB Output is correct
6 Correct 7 ms 5120 KB Output is correct
7 Correct 6 ms 5120 KB Output is correct
8 Correct 6 ms 5120 KB Output is correct
9 Correct 6 ms 4992 KB Output is correct
10 Correct 6 ms 5120 KB Output is correct
11 Correct 7 ms 5120 KB Output is correct
12 Correct 7 ms 5104 KB Output is correct
13 Correct 6 ms 4992 KB Output is correct
14 Correct 7 ms 5120 KB Output is correct
15 Correct 7 ms 4992 KB Output is correct
16 Correct 6 ms 4992 KB Output is correct
17 Correct 6 ms 5120 KB Output is correct
18 Correct 5 ms 4992 KB Output is correct
19 Correct 6 ms 5120 KB Output is correct
20 Correct 6 ms 5120 KB Output is correct
21 Correct 5 ms 4992 KB Output is correct
22 Correct 6 ms 4992 KB Output is correct
23 Correct 6 ms 4992 KB Output is correct
24 Correct 6 ms 5120 KB Output is correct
25 Correct 6 ms 5120 KB Output is correct
26 Correct 5 ms 4992 KB Output is correct
27 Correct 6 ms 5120 KB Output is correct
28 Correct 8 ms 4992 KB Output is correct
29 Correct 6 ms 5120 KB Output is correct
30 Correct 5 ms 4992 KB Output is correct
31 Correct 6 ms 5120 KB Output is correct
32 Correct 5 ms 4992 KB Output is correct
33 Correct 6 ms 5120 KB Output is correct
34 Correct 6 ms 5120 KB Output is correct
35 Correct 5 ms 4992 KB Output is correct
36 Correct 6 ms 5120 KB Output is correct
37 Correct 5 ms 4992 KB Output is correct
38 Correct 6 ms 5120 KB Output is correct
39 Correct 6 ms 5120 KB Output is correct
40 Correct 6 ms 4992 KB Output is correct

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 7 ms 5120 KB Output is correct
3 Correct 6 ms 5120 KB Output is correct
4 Correct 6 ms 4992 KB Output is correct
5 Correct 5 ms 4992 KB Output is correct
6 Correct 7 ms 5120 KB Output is correct
7 Correct 6 ms 5120 KB Output is correct
8 Correct 6 ms 5120 KB Output is correct
9 Correct 6 ms 4992 KB Output is correct
10 Correct 6 ms 5120 KB Output is correct
11 Correct 7 ms 5120 KB Output is correct
12 Correct 7 ms 5104 KB Output is correct
13 Correct 6 ms 4992 KB Output is correct
14 Correct 7 ms 5120 KB Output is correct
15 Correct 7 ms 4992 KB Output is correct
16 Correct 6 ms 4992 KB Output is correct
17 Correct 6 ms 5120 KB Output is correct
18 Correct 5 ms 4992 KB Output is correct
19 Correct 6 ms 5120 KB Output is correct
20 Correct 6 ms 5120 KB Output is correct
21 Correct 5 ms 4992 KB Output is correct
22 Correct 6 ms 4992 KB Output is correct
23 Correct 6 ms 4992 KB Output is correct
24 Correct 6 ms 5120 KB Output is correct
25 Correct 6 ms 5120 KB Output is correct
26 Correct 5 ms 4992 KB Output is correct
27 Correct 6 ms 5120 KB Output is correct
28 Correct 8 ms 4992 KB Output is correct
29 Correct 6 ms 5120 KB Output is correct
30 Correct 5 ms 4992 KB Output is correct
31 Correct 6 ms 5120 KB Output is correct
32 Correct 5 ms 4992 KB Output is correct
33 Correct 6 ms 5120 KB Output is correct
34 Correct 6 ms 5120 KB Output is correct
35 Correct 5 ms 4992 KB Output is correct
36 Correct 6 ms 5120 KB Output is correct
37 Correct 5 ms 4992 KB Output is correct
38 Correct 6 ms 5120 KB Output is correct
39 Correct 6 ms 5120 KB Output is correct
40 Correct 6 ms 4992 KB Output is correct
41 Correct 6 ms 5120 KB Output is correct
42 Correct 7 ms 5120 KB Output is correct
43 Correct 6 ms 5120 KB Output is correct
44 Incorrect 6 ms 5120 KB no wires in direction 1 between segments 4 and 22
45 Halted 0 ms 0 KB -

Subtask #3
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 7 ms 5120 KB Output is correct
3 Correct 6 ms 5120 KB Output is correct
4 Correct 6 ms 4992 KB Output is correct
5 Correct 5 ms 4992 KB Output is correct
6 Correct 7 ms 5120 KB Output is correct
7 Correct 6 ms 5120 KB Output is correct
8 Correct 6 ms 5120 KB Output is correct
9 Correct 6 ms 4992 KB Output is correct
10 Correct 6 ms 5120 KB Output is correct
11 Correct 7 ms 5120 KB Output is correct
12 Correct 7 ms 5104 KB Output is correct
13 Correct 6 ms 4992 KB Output is correct
14 Correct 7 ms 5120 KB Output is correct
15 Correct 7 ms 4992 KB Output is correct
16 Correct 6 ms 4992 KB Output is correct
17 Correct 6 ms 5120 KB Output is correct
18 Correct 5 ms 4992 KB Output is correct
19 Correct 6 ms 5120 KB Output is correct
20 Correct 6 ms 5120 KB Output is correct
21 Correct 5 ms 4992 KB Output is correct
22 Correct 6 ms 4992 KB Output is correct
23 Correct 6 ms 4992 KB Output is correct
24 Correct 6 ms 5120 KB Output is correct
25 Correct 6 ms 5120 KB Output is correct
26 Correct 5 ms 4992 KB Output is correct
27 Correct 6 ms 5120 KB Output is correct
28 Correct 8 ms 4992 KB Output is correct
29 Correct 6 ms 5120 KB Output is correct
30 Correct 5 ms 4992 KB Output is correct
31 Correct 6 ms 5120 KB Output is correct
32 Correct 5 ms 4992 KB Output is correct
33 Correct 6 ms 5120 KB Output is correct
34 Correct 6 ms 5120 KB Output is correct
35 Correct 5 ms 4992 KB Output is correct
36 Correct 6 ms 5120 KB Output is correct
37 Correct 5 ms 4992 KB Output is correct
38 Correct 6 ms 5120 KB Output is correct
39 Correct 6 ms 5120 KB Output is correct
40 Correct 6 ms 4992 KB Output is correct
41 Correct 6 ms 5120 KB Output is correct
42 Correct 7 ms 5120 KB Output is correct
43 Correct 6 ms 5120 KB Output is correct
44 Incorrect 6 ms 5120 KB no wires in direction 1 between segments 4 and 22
45 Halted 0 ms 0 KB -

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 46 ms 13884 KB Output is correct
2 Correct 8 ms 5808 KB Output is correct
3 Correct 23 ms 8576 KB Output is correct
4 Correct 39 ms 12152 KB Output is correct
5 Correct 83 ms 12504 KB Output is correct
6 Correct 82 ms 10744 KB Output is correct
7 Correct 165 ms 12760 KB Output is correct
8 Correct 18 ms 8704 KB Output is correct
9 Correct 17 ms 8576 KB Output is correct
10 Correct 95 ms 12792 KB Output is correct
11 Correct 62 ms 11508 KB Output is correct
12 Correct 81 ms 14960 KB Output is correct
13 Correct 7 ms 5888 KB Output is correct
14 Correct 7 ms 5888 KB Output is correct
15 Correct 114 ms 14996 KB Output is correct
16 Correct 34 ms 11768 KB Output is correct
17 Correct 135 ms 16368 KB Output is correct
18 Correct 34 ms 7928 KB Output is correct
19 Correct 10 ms 5760 KB Output is correct
20 Correct 36 ms 10684 KB Output is correct

Subtask #5
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5120 KB Output is correct
2 Correct 7 ms 5120 KB Output is correct
3 Correct 6 ms 5120 KB Output is correct
4 Correct 6 ms 4992 KB Output is correct
5 Correct 5 ms 4992 KB Output is correct
6 Correct 7 ms 5120 KB Output is correct
7 Correct 6 ms 5120 KB Output is correct
8 Correct 6 ms 5120 KB Output is correct
9 Correct 6 ms 4992 KB Output is correct
10 Correct 6 ms 5120 KB Output is correct
11 Correct 7 ms 5120 KB Output is correct
12 Correct 7 ms 5104 KB Output is correct
13 Correct 6 ms 4992 KB Output is correct
14 Correct 7 ms 5120 KB Output is correct
15 Correct 7 ms 4992 KB Output is correct
16 Correct 6 ms 4992 KB Output is correct
17 Correct 6 ms 5120 KB Output is correct
18 Correct 5 ms 4992 KB Output is correct
19 Correct 6 ms 5120 KB Output is correct
20 Correct 6 ms 5120 KB Output is correct
21 Correct 5 ms 4992 KB Output is correct
22 Correct 6 ms 4992 KB Output is correct
23 Correct 6 ms 4992 KB Output is correct
24 Correct 6 ms 5120 KB Output is correct
25 Correct 6 ms 5120 KB Output is correct
26 Correct 5 ms 4992 KB Output is correct
27 Correct 6 ms 5120 KB Output is correct
28 Correct 8 ms 4992 KB Output is correct
29 Correct 6 ms 5120 KB Output is correct
30 Correct 5 ms 4992 KB Output is correct
31 Correct 6 ms 5120 KB Output is correct
32 Correct 5 ms 4992 KB Output is correct
33 Correct 6 ms 5120 KB Output is correct
34 Correct 6 ms 5120 KB Output is correct
35 Correct 5 ms 4992 KB Output is correct
36 Correct 6 ms 5120 KB Output is correct
37 Correct 5 ms 4992 KB Output is correct
38 Correct 6 ms 5120 KB Output is correct
39 Correct 6 ms 5120 KB Output is correct
40 Correct 6 ms 4992 KB Output is correct
41 Correct 6 ms 5120 KB Output is correct
42 Correct 7 ms 5120 KB Output is correct
43 Correct 6 ms 5120 KB Output is correct
44 Incorrect 6 ms 5120 KB no wires in direction 1 between segments 4 and 22
45 Halted 0 ms 0 KB -