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Submission #566692

# Submission time Handle Problem Language Result Execution time Memory
566692 2022-05-22T16:27:55 Z two_sides Alternating Current (BOI18_alternating) C++17
32 / 100
 71 ms 17220 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);
        }
    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 3 ms 5332 KB Output is correct
4 Correct 4 ms 5332 KB Output is correct
5 Correct 4 ms 5332 KB Output is correct
6 Correct 4 ms 5332 KB Output is correct
7 Correct 3 ms 5416 KB Output is correct
8 Correct 4 ms 4948 KB Output is correct
9 Correct 3 ms 5300 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 2 ms 4948 KB Output is correct
12 Correct 3 ms 5332 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 5332 KB Output is correct
15 Correct 3 ms 5332 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 3 ms 5332 KB Output is correct
20 Correct 3 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 4 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 4 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 2 ms 4948 KB Output is correct
31 Correct 3 ms 5332 KB Output is correct
32 Correct 2 ms 5020 KB Output is correct
33 Correct 3 ms 5332 KB Output is correct
34 Correct 2 ms 4948 KB Output is correct
35 Correct 3 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 3 ms 5424 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 3 ms 5332 KB Output is correct
4 Correct 4 ms 5332 KB Output is correct
5 Correct 4 ms 5332 KB Output is correct
6 Correct 4 ms 5332 KB Output is correct
7 Correct 3 ms 5416 KB Output is correct
8 Correct 4 ms 4948 KB Output is correct
9 Correct 3 ms 5300 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 2 ms 4948 KB Output is correct
12 Correct 3 ms 5332 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 5332 KB Output is correct
15 Correct 3 ms 5332 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 3 ms 5332 KB Output is correct
20 Correct 3 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 4 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 4 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 2 ms 4948 KB Output is correct
31 Correct 3 ms 5332 KB Output is correct
32 Correct 2 ms 5020 KB Output is correct
33 Correct 3 ms 5332 KB Output is correct
34 Correct 2 ms 4948 KB Output is correct
35 Correct 3 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 3 ms 5424 KB Output is correct
40 Correct 3 ms 5332 KB Output is correct
41 Correct 5 ms 5332 KB Output is correct
42 Correct 3 ms 5356 KB Output is correct
43 Correct 3 ms 5332 KB Output is correct
44 Correct 3 ms 5332 KB Output is correct
45 Correct 3 ms 5332 KB Output is correct
46 Correct 4 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 4960 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 3 ms 5332 KB Output is correct
4 Correct 4 ms 5332 KB Output is correct
5 Correct 4 ms 5332 KB Output is correct
6 Correct 4 ms 5332 KB Output is correct
7 Correct 3 ms 5416 KB Output is correct
8 Correct 4 ms 4948 KB Output is correct
9 Correct 3 ms 5300 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 2 ms 4948 KB Output is correct
12 Correct 3 ms 5332 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 5332 KB Output is correct
15 Correct 3 ms 5332 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 3 ms 5332 KB Output is correct
20 Correct 3 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 4 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 4 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 2 ms 4948 KB Output is correct
31 Correct 3 ms 5332 KB Output is correct
32 Correct 2 ms 5020 KB Output is correct
33 Correct 3 ms 5332 KB Output is correct
34 Correct 2 ms 4948 KB Output is correct
35 Correct 3 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 3 ms 5424 KB Output is correct
40 Correct 3 ms 5332 KB Output is correct
41 Correct 5 ms 5332 KB Output is correct
42 Correct 3 ms 5356 KB Output is correct
43 Correct 3 ms 5332 KB Output is correct
44 Correct 3 ms 5332 KB Output is correct
45 Correct 3 ms 5332 KB Output is correct
46 Correct 4 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 4960 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 35 ms 14032 KB Output is correct
2 Correct 4 ms 5332 KB Output is correct
3 Correct 22 ms 9424 KB Output is correct
4 Correct 37 ms 12584 KB Output is correct
5 Correct 52 ms 15204 KB Output is correct
6 Correct 42 ms 12492 KB Output is correct
7 Correct 45 ms 15432 KB Output is correct
8 Correct 11 ms 8752 KB Output is correct
9 Correct 10 ms 8404 KB Output is correct
10 Correct 63 ms 14536 KB Output is correct
11 Correct 42 ms 12736 KB Output is correct
12 Correct 43 ms 11804 KB Output is correct
13 Correct 4 ms 5332 KB Output is correct
14 Correct 3 ms 5332 KB Output is correct
15 Correct 63 ms 16540 KB Output is correct
16 Correct 23 ms 11988 KB Output is correct
17 Correct 71 ms 17220 KB Output is correct
18 Correct 30 ms 8956 KB Output is correct
19 Correct 6 ms 5716 KB Output is correct
20 Correct 35 ms 12872 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 3 ms 5332 KB Output is correct
4 Correct 4 ms 5332 KB Output is correct
5 Correct 4 ms 5332 KB Output is correct
6 Correct 4 ms 5332 KB Output is correct
7 Correct 3 ms 5416 KB Output is correct
8 Correct 4 ms 4948 KB Output is correct
9 Correct 3 ms 5300 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 2 ms 4948 KB Output is correct
12 Correct 3 ms 5332 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 3 ms 5332 KB Output is correct
15 Correct 3 ms 5332 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 3 ms 5332 KB Output is correct
20 Correct 3 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 4 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 4 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 2 ms 4948 KB Output is correct
31 Correct 3 ms 5332 KB Output is correct
32 Correct 2 ms 5020 KB Output is correct
33 Correct 3 ms 5332 KB Output is correct
34 Correct 2 ms 4948 KB Output is correct
35 Correct 3 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 3 ms 5424 KB Output is correct
40 Correct 3 ms 5332 KB Output is correct
41 Correct 5 ms 5332 KB Output is correct
42 Correct 3 ms 5356 KB Output is correct
43 Correct 3 ms 5332 KB Output is correct
44 Correct 3 ms 5332 KB Output is correct
45 Correct 3 ms 5332 KB Output is correct
46 Correct 4 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 4960 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 -