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Submission #566694

# Submission time Handle Problem Language Result Execution time Memory
566694 2022-05-22T16:29:11 Z two_sides Alternating Current (BOI18_alternating) C++17
32 / 100
 65 ms 17292 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 100005;

int cnt[N], l[N], r[N], n, m;
vector<pair<int, int>> adj[N * 2];
vector<int> path;
bool vis[N * 2];

bool dfs(int u) {
    if (u == n) return 1;
    if (vis[u]) return 0;
    vis[u] = 1;
    for (auto e : adj[u]) {
        int v, i; tie(v, i) = e;
        path.push_back(i);
        if (dfs(v)) return 1;
        path.pop_back();
    }
    return 0;
}

int main() {
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> m;
    for (int i = 1; i <= m; i++)
        cin >> l[i] >> r[i];
    {
        int x = *min_element(l + 1, l + m + 1);
        for (int i = 1; i <= m; i++) {
            l[i] -= x; r[i] -= x;
            if (r[i] < 0) r[i] += n;
        }
    }
    for (int i = 1; i <= m; i++)
        if (l[i] <= r[i]) {
            cnt[l[i]]++; cnt[r[i] + 1]--;
            adj[l[i]].emplace_back(r[i] + 1, i);
            adj[l[i] + n].emplace_back(r[i] + 1 + n, i);
        } else {
            cnt[0]++; cnt[l[i]]++; cnt[r[i] + 1]--;
            adj[l[i]].emplace_back(r[i] + 1 + n, i);
            adj[l[i] + n].emplace_back(2 * n, i);
        }
    for (int i = 0; i < n; i++) {    
        cnt[i + 1] += cnt[i];
        if (cnt[i] < 2)
            return cout << "impossible", 0;
        if (cnt[i] > 2) {
            adj[i + 1].emplace_back(i, 0);
            adj[i + 1 + n].emplace_back(i + n, 0);
        }
    }
    if (dfs(0)) {
        memset(cnt, 0, sizeof cnt);
        for (int i : path) cnt[i] = 1;
        for (int i = 1; i <= m; i++)
            cout << cnt[i];
    } else cout << "impossible";
}

Subtask #1
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5332 KB Output is correct
2 Correct 3 ms 5332 KB Output is correct
3 Correct 2 ms 5332 KB Output is correct
4 Correct 3 ms 5332 KB Output is correct
5 Correct 3 ms 5380 KB Output is correct
6 Correct 3 ms 5332 KB Output is correct
7 Correct 3 ms 5332 KB Output is correct
8 Correct 4 ms 4916 KB Output is correct
9 Correct 2 ms 5332 KB Output is correct
10 Correct 3 ms 4936 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 4 ms 5332 KB Output is correct
13 Correct 4 ms 4948 KB Output is correct
14 Correct 4 ms 5320 KB Output is correct
15 Correct 3 ms 5460 KB Output is correct
16 Correct 3 ms 5332 KB Output is correct
17 Correct 3 ms 5332 KB Output is correct
18 Correct 3 ms 5332 KB Output is correct
19 Correct 2 ms 5332 KB Output is correct
20 Correct 4 ms 5332 KB Output is correct
21 Correct 3 ms 5332 KB Output is correct
22 Correct 3 ms 5332 KB Output is correct
23 Correct 3 ms 5332 KB Output is correct
24 Correct 3 ms 5332 KB Output is correct
25 Correct 3 ms 5332 KB Output is correct
26 Correct 3 ms 5332 KB Output is correct
27 Correct 3 ms 4948 KB Output is correct
28 Correct 3 ms 5332 KB Output is correct
29 Correct 3 ms 4948 KB Output is correct
30 Correct 3 ms 4948 KB Output is correct
31 Correct 3 ms 5332 KB Output is correct
32 Correct 3 ms 4948 KB Output is correct
33 Correct 3 ms 5352 KB Output is correct
34 Correct 3 ms 4948 KB Output is correct
35 Correct 2 ms 4948 KB Output is correct
36 Correct 3 ms 5332 KB Output is correct
37 Correct 3 ms 5332 KB Output is correct
38 Correct 3 ms 4948 KB Output is correct
39 Correct 2 ms 5332 KB Output is correct
40 Correct 3 ms 5332 KB Output is correct

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5332 KB Output is correct
2 Correct 3 ms 5332 KB Output is correct
3 Correct 2 ms 5332 KB Output is correct
4 Correct 3 ms 5332 KB Output is correct
5 Correct 3 ms 5380 KB Output is correct
6 Correct 3 ms 5332 KB Output is correct
7 Correct 3 ms 5332 KB Output is correct
8 Correct 4 ms 4916 KB Output is correct
9 Correct 2 ms 5332 KB Output is correct
10 Correct 3 ms 4936 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 4 ms 5332 KB Output is correct
13 Correct 4 ms 4948 KB Output is correct
14 Correct 4 ms 5320 KB Output is correct
15 Correct 3 ms 5460 KB Output is correct
16 Correct 3 ms 5332 KB Output is correct
17 Correct 3 ms 5332 KB Output is correct
18 Correct 3 ms 5332 KB Output is correct
19 Correct 2 ms 5332 KB Output is correct
20 Correct 4 ms 5332 KB Output is correct
21 Correct 3 ms 5332 KB Output is correct
22 Correct 3 ms 5332 KB Output is correct
23 Correct 3 ms 5332 KB Output is correct
24 Correct 3 ms 5332 KB Output is correct
25 Correct 3 ms 5332 KB Output is correct
26 Correct 3 ms 5332 KB Output is correct
27 Correct 3 ms 4948 KB Output is correct
28 Correct 3 ms 5332 KB Output is correct
29 Correct 3 ms 4948 KB Output is correct
30 Correct 3 ms 4948 KB Output is correct
31 Correct 3 ms 5332 KB Output is correct
32 Correct 3 ms 4948 KB Output is correct
33 Correct 3 ms 5352 KB Output is correct
34 Correct 3 ms 4948 KB Output is correct
35 Correct 2 ms 4948 KB Output is correct
36 Correct 3 ms 5332 KB Output is correct
37 Correct 3 ms 5332 KB Output is correct
38 Correct 3 ms 4948 KB Output is correct
39 Correct 2 ms 5332 KB Output is correct
40 Correct 3 ms 5332 KB Output is correct
41 Correct 4 ms 5332 KB Output is correct
42 Correct 3 ms 5332 KB Output is correct
43 Correct 3 ms 5332 KB Output is correct
44 Correct 4 ms 5332 KB Output is correct
45 Correct 3 ms 5404 KB Output is correct
46 Correct 3 ms 5332 KB Output is correct
47 Correct 4 ms 5332 KB Output is correct
48 Correct 3 ms 4948 KB Output is correct
49 Correct 3 ms 5332 KB Output is correct
50 Correct 3 ms 4948 KB Output is correct
51 Correct 3 ms 4948 KB Output is correct
52 Correct 3 ms 4948 KB Output is correct
53 Correct 3 ms 4948 KB Output is correct
54 Correct 3 ms 5332 KB Output is correct
55 Correct 3 ms 5332 KB Output is correct
56 Correct 3 ms 5332 KB Output is correct
57 Incorrect 2 ms 4948 KB 'impossible' claimed, but there is a solution
58 Halted 0 ms 0 KB -

Subtask #3
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5332 KB Output is correct
2 Correct 3 ms 5332 KB Output is correct
3 Correct 2 ms 5332 KB Output is correct
4 Correct 3 ms 5332 KB Output is correct
5 Correct 3 ms 5380 KB Output is correct
6 Correct 3 ms 5332 KB Output is correct
7 Correct 3 ms 5332 KB Output is correct
8 Correct 4 ms 4916 KB Output is correct
9 Correct 2 ms 5332 KB Output is correct
10 Correct 3 ms 4936 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 4 ms 5332 KB Output is correct
13 Correct 4 ms 4948 KB Output is correct
14 Correct 4 ms 5320 KB Output is correct
15 Correct 3 ms 5460 KB Output is correct
16 Correct 3 ms 5332 KB Output is correct
17 Correct 3 ms 5332 KB Output is correct
18 Correct 3 ms 5332 KB Output is correct
19 Correct 2 ms 5332 KB Output is correct
20 Correct 4 ms 5332 KB Output is correct
21 Correct 3 ms 5332 KB Output is correct
22 Correct 3 ms 5332 KB Output is correct
23 Correct 3 ms 5332 KB Output is correct
24 Correct 3 ms 5332 KB Output is correct
25 Correct 3 ms 5332 KB Output is correct
26 Correct 3 ms 5332 KB Output is correct
27 Correct 3 ms 4948 KB Output is correct
28 Correct 3 ms 5332 KB Output is correct
29 Correct 3 ms 4948 KB Output is correct
30 Correct 3 ms 4948 KB Output is correct
31 Correct 3 ms 5332 KB Output is correct
32 Correct 3 ms 4948 KB Output is correct
33 Correct 3 ms 5352 KB Output is correct
34 Correct 3 ms 4948 KB Output is correct
35 Correct 2 ms 4948 KB Output is correct
36 Correct 3 ms 5332 KB Output is correct
37 Correct 3 ms 5332 KB Output is correct
38 Correct 3 ms 4948 KB Output is correct
39 Correct 2 ms 5332 KB Output is correct
40 Correct 3 ms 5332 KB Output is correct
41 Correct 4 ms 5332 KB Output is correct
42 Correct 3 ms 5332 KB Output is correct
43 Correct 3 ms 5332 KB Output is correct
44 Correct 4 ms 5332 KB Output is correct
45 Correct 3 ms 5404 KB Output is correct
46 Correct 3 ms 5332 KB Output is correct
47 Correct 4 ms 5332 KB Output is correct
48 Correct 3 ms 4948 KB Output is correct
49 Correct 3 ms 5332 KB Output is correct
50 Correct 3 ms 4948 KB Output is correct
51 Correct 3 ms 4948 KB Output is correct
52 Correct 3 ms 4948 KB Output is correct
53 Correct 3 ms 4948 KB Output is correct
54 Correct 3 ms 5332 KB Output is correct
55 Correct 3 ms 5332 KB Output is correct
56 Correct 3 ms 5332 KB Output is correct
57 Incorrect 2 ms 4948 KB 'impossible' claimed, but there is a solution
58 Halted 0 ms 0 KB -

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 33 ms 14132 KB Output is correct
2 Correct 3 ms 5332 KB Output is correct
3 Correct 17 ms 8916 KB Output is correct
4 Correct 27 ms 12104 KB Output is correct
5 Correct 57 ms 14152 KB Output is correct
6 Correct 49 ms 11348 KB Output is correct
7 Correct 48 ms 14428 KB Output is correct
8 Correct 8 ms 8736 KB Output is correct
9 Correct 7 ms 8428 KB Output is correct
10 Correct 52 ms 14480 KB Output is correct
11 Correct 37 ms 12752 KB Output is correct
12 Correct 51 ms 11736 KB Output is correct
13 Correct 3 ms 5332 KB Output is correct
14 Correct 4 ms 5332 KB Output is correct
15 Correct 64 ms 16612 KB Output is correct
16 Correct 26 ms 12004 KB Output is correct
17 Correct 65 ms 17292 KB Output is correct
18 Correct 31 ms 8940 KB Output is correct
19 Correct 5 ms 5716 KB Output is correct
20 Correct 34 ms 12800 KB Output is correct

Subtask #5
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 5332 KB Output is correct
2 Correct 3 ms 5332 KB Output is correct
3 Correct 2 ms 5332 KB Output is correct
4 Correct 3 ms 5332 KB Output is correct
5 Correct 3 ms 5380 KB Output is correct
6 Correct 3 ms 5332 KB Output is correct
7 Correct 3 ms 5332 KB Output is correct
8 Correct 4 ms 4916 KB Output is correct
9 Correct 2 ms 5332 KB Output is correct
10 Correct 3 ms 4936 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 4 ms 5332 KB Output is correct
13 Correct 4 ms 4948 KB Output is correct
14 Correct 4 ms 5320 KB Output is correct
15 Correct 3 ms 5460 KB Output is correct
16 Correct 3 ms 5332 KB Output is correct
17 Correct 3 ms 5332 KB Output is correct
18 Correct 3 ms 5332 KB Output is correct
19 Correct 2 ms 5332 KB Output is correct
20 Correct 4 ms 5332 KB Output is correct
21 Correct 3 ms 5332 KB Output is correct
22 Correct 3 ms 5332 KB Output is correct
23 Correct 3 ms 5332 KB Output is correct
24 Correct 3 ms 5332 KB Output is correct
25 Correct 3 ms 5332 KB Output is correct
26 Correct 3 ms 5332 KB Output is correct
27 Correct 3 ms 4948 KB Output is correct
28 Correct 3 ms 5332 KB Output is correct
29 Correct 3 ms 4948 KB Output is correct
30 Correct 3 ms 4948 KB Output is correct
31 Correct 3 ms 5332 KB Output is correct
32 Correct 3 ms 4948 KB Output is correct
33 Correct 3 ms 5352 KB Output is correct
34 Correct 3 ms 4948 KB Output is correct
35 Correct 2 ms 4948 KB Output is correct
36 Correct 3 ms 5332 KB Output is correct
37 Correct 3 ms 5332 KB Output is correct
38 Correct 3 ms 4948 KB Output is correct
39 Correct 2 ms 5332 KB Output is correct
40 Correct 3 ms 5332 KB Output is correct
41 Correct 4 ms 5332 KB Output is correct
42 Correct 3 ms 5332 KB Output is correct
43 Correct 3 ms 5332 KB Output is correct
44 Correct 4 ms 5332 KB Output is correct
45 Correct 3 ms 5404 KB Output is correct
46 Correct 3 ms 5332 KB Output is correct
47 Correct 4 ms 5332 KB Output is correct
48 Correct 3 ms 4948 KB Output is correct
49 Correct 3 ms 5332 KB Output is correct
50 Correct 3 ms 4948 KB Output is correct
51 Correct 3 ms 4948 KB Output is correct
52 Correct 3 ms 4948 KB Output is correct
53 Correct 3 ms 4948 KB Output is correct
54 Correct 3 ms 5332 KB Output is correct
55 Correct 3 ms 5332 KB Output is correct
56 Correct 3 ms 5332 KB Output is correct
57 Incorrect 2 ms 4948 KB 'impossible' claimed, but there is a solution
58 Halted 0 ms 0 KB -