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Submission #566695

# Submission time Handle Problem Language Result Execution time Memory
566695 2022-05-22T16:33:15 Z two_sides Alternating Current (BOI18_alternating) C++17
100 / 100
 68 ms 19152 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;
int vis[N * 2], timer;

bool dfs(int u, int p) {
    if (u == p) return 1;
    if (vis[u] == timer) return 0;
    vis[u] = timer;
    for (auto e : adj[u]) {
        int v, i; tie(v, i) = e;
        path.push_back(i);
        if (dfs(v, p)) 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);
        }
    }
    for (int i = 0; i < n; i++) {
        timer++;
        if (dfs(i, i + n)) {
            memset(cnt, 0, sizeof cnt);
            for (int i : path) cnt[i] = 1;
            for (int i = 1; i <= m; i++)
                cout << cnt[i];
            return 0;
        }
    }
    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 3 ms 5332 KB Output is correct
5 Correct 3 ms 5332 KB Output is correct
6 Correct 2 ms 5332 KB Output is correct
7 Correct 3 ms 5332 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 3 ms 5332 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 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 3 ms 5332 KB Output is correct
25 Correct 2 ms 5332 KB Output is correct
26 Correct 3 ms 5352 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 2 ms 4948 KB Output is correct
31 Correct 4 ms 5332 KB Output is correct
32 Correct 4 ms 4948 KB Output is correct
33 Correct 3 ms 5332 KB Output is correct
34 Correct 3 ms 4948 KB Output is correct
35 Correct 5 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 2 ms 4948 KB Output is correct
39 Correct 3 ms 5332 KB Output is correct
40 Correct 2 ms 5332 KB Output is correct

Subtask #2
20.0 / 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 3 ms 5332 KB Output is correct
5 Correct 3 ms 5332 KB Output is correct
6 Correct 2 ms 5332 KB Output is correct
7 Correct 3 ms 5332 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 3 ms 5332 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 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 3 ms 5332 KB Output is correct
25 Correct 2 ms 5332 KB Output is correct
26 Correct 3 ms 5352 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 2 ms 4948 KB Output is correct
31 Correct 4 ms 5332 KB Output is correct
32 Correct 4 ms 4948 KB Output is correct
33 Correct 3 ms 5332 KB Output is correct
34 Correct 3 ms 4948 KB Output is correct
35 Correct 5 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 2 ms 4948 KB Output is correct
39 Correct 3 ms 5332 KB Output is correct
40 Correct 2 ms 5332 KB Output is correct
41 Correct 3 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 3 ms 5344 KB Output is correct
45 Correct 3 ms 5332 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 Correct 3 ms 5332 KB Output is correct
58 Correct 3 ms 5332 KB Output is correct
59 Correct 3 ms 5332 KB Output is correct
60 Correct 3 ms 5332 KB Output is correct
61 Correct 3 ms 5332 KB Output is correct
62 Correct 3 ms 4948 KB Output is correct
63 Correct 2 ms 4948 KB Output is correct
64 Correct 3 ms 5332 KB Output is correct
65 Correct 2 ms 4948 KB Output is correct
66 Correct 3 ms 5332 KB Output is correct
67 Correct 3 ms 5332 KB Output is correct
68 Correct 3 ms 5332 KB Output is correct
69 Correct 3 ms 5332 KB Output is correct

Subtask #3
22.0 / 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 3 ms 5332 KB Output is correct
5 Correct 3 ms 5332 KB Output is correct
6 Correct 2 ms 5332 KB Output is correct
7 Correct 3 ms 5332 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 3 ms 5332 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 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 3 ms 5332 KB Output is correct
25 Correct 2 ms 5332 KB Output is correct
26 Correct 3 ms 5352 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 2 ms 4948 KB Output is correct
31 Correct 4 ms 5332 KB Output is correct
32 Correct 4 ms 4948 KB Output is correct
33 Correct 3 ms 5332 KB Output is correct
34 Correct 3 ms 4948 KB Output is correct
35 Correct 5 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 2 ms 4948 KB Output is correct
39 Correct 3 ms 5332 KB Output is correct
40 Correct 2 ms 5332 KB Output is correct
41 Correct 3 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 3 ms 5344 KB Output is correct
45 Correct 3 ms 5332 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 Correct 3 ms 5332 KB Output is correct
58 Correct 3 ms 5332 KB Output is correct
59 Correct 3 ms 5332 KB Output is correct
60 Correct 3 ms 5332 KB Output is correct
61 Correct 3 ms 5332 KB Output is correct
62 Correct 3 ms 4948 KB Output is correct
63 Correct 2 ms 4948 KB Output is correct
64 Correct 3 ms 5332 KB Output is correct
65 Correct 2 ms 4948 KB Output is correct
66 Correct 3 ms 5332 KB Output is correct
67 Correct 3 ms 5332 KB Output is correct
68 Correct 3 ms 5332 KB Output is correct
69 Correct 3 ms 5332 KB Output is correct
70 Correct 3 ms 5460 KB Output is correct
71 Correct 3 ms 5460 KB Output is correct
72 Correct 3 ms 5332 KB Output is correct
73 Correct 3 ms 5332 KB Output is correct
74 Correct 3 ms 5332 KB Output is correct
75 Correct 3 ms 5332 KB Output is correct
76 Correct 3 ms 5076 KB Output is correct
77 Correct 4 ms 5460 KB Output is correct
78 Correct 3 ms 4948 KB Output is correct
79 Correct 3 ms 4948 KB Output is correct
80 Correct 3 ms 5076 KB Output is correct
81 Correct 3 ms 5460 KB Output is correct
82 Correct 3 ms 5460 KB Output is correct
83 Correct 3 ms 5496 KB Output is correct
84 Correct 5 ms 5460 KB Output is correct
85 Correct 3 ms 5332 KB Output is correct
86 Correct 3 ms 5332 KB Output is correct
87 Correct 4 ms 5404 KB Output is correct
88 Correct 3 ms 5332 KB Output is correct
89 Correct 4 ms 5076 KB Output is correct
90 Correct 4 ms 5460 KB Output is correct
91 Correct 3 ms 5460 KB Output is correct
92 Correct 3 ms 5460 KB Output is correct
93 Correct 3 ms 5460 KB Output is correct
94 Correct 3 ms 4948 KB Output is correct
95 Correct 3 ms 5460 KB Output is correct
96 Correct 4 ms 5460 KB Output is correct
97 Correct 3 ms 5460 KB Output is correct
98 Correct 4 ms 5460 KB Output is correct

Subtask #4
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 14080 KB Output is correct
2 Correct 4 ms 5332 KB Output is correct
3 Correct 15 ms 8916 KB Output is correct
4 Correct 25 ms 12076 KB Output is correct
5 Correct 43 ms 14396 KB Output is correct
6 Correct 42 ms 11344 KB Output is correct
7 Correct 44 ms 14636 KB Output is correct
8 Correct 8 ms 8916 KB Output is correct
9 Correct 10 ms 8660 KB Output is correct
10 Correct 57 ms 14776 KB Output is correct
11 Correct 38 ms 13040 KB Output is correct
12 Correct 37 ms 11808 KB Output is correct
13 Correct 3 ms 5332 KB Output is correct
14 Correct 3 ms 5332 KB Output is correct
15 Correct 68 ms 16896 KB Output is correct
16 Correct 22 ms 12076 KB Output is correct
17 Correct 62 ms 17428 KB Output is correct
18 Correct 29 ms 8896 KB Output is correct
19 Correct 5 ms 5712 KB Output is correct
20 Correct 30 ms 12988 KB Output is correct

Subtask #5
26.0 / 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 3 ms 5332 KB Output is correct
5 Correct 3 ms 5332 KB Output is correct
6 Correct 2 ms 5332 KB Output is correct
7 Correct 3 ms 5332 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 3 ms 5332 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 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 3 ms 5332 KB Output is correct
25 Correct 2 ms 5332 KB Output is correct
26 Correct 3 ms 5352 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 2 ms 4948 KB Output is correct
31 Correct 4 ms 5332 KB Output is correct
32 Correct 4 ms 4948 KB Output is correct
33 Correct 3 ms 5332 KB Output is correct
34 Correct 3 ms 4948 KB Output is correct
35 Correct 5 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 2 ms 4948 KB Output is correct
39 Correct 3 ms 5332 KB Output is correct
40 Correct 2 ms 5332 KB Output is correct
41 Correct 3 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 3 ms 5344 KB Output is correct
45 Correct 3 ms 5332 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 Correct 3 ms 5332 KB Output is correct
58 Correct 3 ms 5332 KB Output is correct
59 Correct 3 ms 5332 KB Output is correct
60 Correct 3 ms 5332 KB Output is correct
61 Correct 3 ms 5332 KB Output is correct
62 Correct 3 ms 4948 KB Output is correct
63 Correct 2 ms 4948 KB Output is correct
64 Correct 3 ms 5332 KB Output is correct
65 Correct 2 ms 4948 KB Output is correct
66 Correct 3 ms 5332 KB Output is correct
67 Correct 3 ms 5332 KB Output is correct
68 Correct 3 ms 5332 KB Output is correct
69 Correct 3 ms 5332 KB Output is correct
70 Correct 3 ms 5460 KB Output is correct
71 Correct 3 ms 5460 KB Output is correct
72 Correct 3 ms 5332 KB Output is correct
73 Correct 3 ms 5332 KB Output is correct
74 Correct 3 ms 5332 KB Output is correct
75 Correct 3 ms 5332 KB Output is correct
76 Correct 3 ms 5076 KB Output is correct
77 Correct 4 ms 5460 KB Output is correct
78 Correct 3 ms 4948 KB Output is correct
79 Correct 3 ms 4948 KB Output is correct
80 Correct 3 ms 5076 KB Output is correct
81 Correct 3 ms 5460 KB Output is correct
82 Correct 3 ms 5460 KB Output is correct
83 Correct 3 ms 5496 KB Output is correct
84 Correct 5 ms 5460 KB Output is correct
85 Correct 3 ms 5332 KB Output is correct
86 Correct 3 ms 5332 KB Output is correct
87 Correct 4 ms 5404 KB Output is correct
88 Correct 3 ms 5332 KB Output is correct
89 Correct 4 ms 5076 KB Output is correct
90 Correct 4 ms 5460 KB Output is correct
91 Correct 3 ms 5460 KB Output is correct
92 Correct 3 ms 5460 KB Output is correct
93 Correct 3 ms 5460 KB Output is correct
94 Correct 3 ms 4948 KB Output is correct
95 Correct 3 ms 5460 KB Output is correct
96 Correct 4 ms 5460 KB Output is correct
97 Correct 3 ms 5460 KB Output is correct
98 Correct 4 ms 5460 KB Output is correct
99 Correct 34 ms 14080 KB Output is correct
100 Correct 4 ms 5332 KB Output is correct
101 Correct 15 ms 8916 KB Output is correct
102 Correct 25 ms 12076 KB Output is correct
103 Correct 43 ms 14396 KB Output is correct
104 Correct 42 ms 11344 KB Output is correct
105 Correct 44 ms 14636 KB Output is correct
106 Correct 8 ms 8916 KB Output is correct
107 Correct 10 ms 8660 KB Output is correct
108 Correct 57 ms 14776 KB Output is correct
109 Correct 38 ms 13040 KB Output is correct
110 Correct 37 ms 11808 KB Output is correct
111 Correct 3 ms 5332 KB Output is correct
112 Correct 3 ms 5332 KB Output is correct
113 Correct 68 ms 16896 KB Output is correct
114 Correct 22 ms 12076 KB Output is correct
115 Correct 62 ms 17428 KB Output is correct
116 Correct 29 ms 8896 KB Output is correct
117 Correct 5 ms 5712 KB Output is correct
118 Correct 30 ms 12988 KB Output is correct
119 Correct 4 ms 6100 KB Output is correct
120 Correct 45 ms 16132 KB Output is correct
121 Correct 41 ms 12424 KB Output is correct
122 Correct 3 ms 5332 KB Output is correct
123 Correct 4 ms 5716 KB Output is correct
124 Correct 16 ms 8148 KB Output is correct
125 Correct 24 ms 12136 KB Output is correct
126 Correct 6 ms 8092 KB Output is correct
127 Correct 13 ms 10196 KB Output is correct
128 Correct 44 ms 16144 KB Output is correct
129 Correct 32 ms 12776 KB Output is correct
130 Correct 31 ms 11444 KB Output is correct
131 Correct 4 ms 5588 KB Output is correct
132 Correct 3 ms 5716 KB Output is correct
133 Correct 59 ms 17480 KB Output is correct
134 Correct 27 ms 17552 KB Output is correct
135 Correct 22 ms 19152 KB Output is correct
136 Correct 25 ms 9208 KB Output is correct
137 Correct 47 ms 12276 KB Output is correct
138 Correct 16 ms 13956 KB Output is correct