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Submission #644165

# Submission time Handle Problem Language Result Execution time Memory
644165 2022-09-24T02:23:01 Z jumpOverTheWall LOSTIKS (INOI20_lostiks) C++14
59 / 100
 2000 ms 160768 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 1e6;

int n, m, s, t, val[N], d[22][N], r[22][N];
int dp[1 << 20][20], key[22], num[22], door[22], distDoor[22], reqDoor[22], dist[22][22], req[22][22];
vector<pair<int, int>> adj[N];

void Dfs(int u, int p, int keyInd) {
    for(auto e : adj[u]) {
        int v = e.first;
        int ind = e.second;
        if (v == p)
            continue;
        r[keyInd][v] = r[keyInd][u] | val[ind];
        d[keyInd][v] = d[keyInd][u] + 1;
        if (keyInd != -1 && val[ind] == (1 << keyInd)) {
            door[keyInd] = u;
            distDoor[keyInd] = d[keyInd][u];
            reqDoor[keyInd] = r[keyInd][u];
        }
        Dfs(v, u, keyInd);
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> s >> t;
    s--, t--;
    for(int i = 0; i < n - 1; i++) {
        int u, v, w;
        cin >> u >> v >> w;
        u--, v--, w--;
        adj[u].push_back({v, i});
        adj[v].push_back({u, i});
        if (w >= 0) {
            key[m] = w;
            num[m] = i;
            ++m;
        }
    }
    key[m] = s;
    key[m + 1] = t;
    door[m] = s;
    door[m + 1] = t;
    for(int i = 0; i < m; i++)
        val[num[i]] = (1 << i);
    for(int i = 0; i < m + 2; i++) {
        Dfs(key[i], -1, i);
    }
    for(int i = 0; i < m + 2; i++)
        for(int j = 0; j < m + 2; j++) {
            dist[i][j] = d[j][door[i]] + distDoor[j];
            req[i][j] = r[j][door[i]] | reqDoor[j];
        }
    int ans = (req[m][m + 1] == 0? dist[m][m + 1] : 1e9);
    for(int mask = 0; mask < (1 << m); mask++)
        for(int i = 0; i < m; i++)
            dp[mask][i] = 1e9;
    for(int i = 0; i < m; i++)
        if (req[m][i] == 0)
            dp[(1 << i)][i] = dist[m][i];
    for(int mask = 0; mask < (1 << m); mask++)
        for(int i = 0; i < m; i++) {
            if (dp[mask][i] == 1e9)
                continue;
            if ((mask & req[i][m + 1]) == req[i][m + 1])
                ans = min(ans, dp[mask][i] + dist[i][m + 1]);
            for(int j = 0; j < m; j++)
                if ((mask & req[i][j]) == req[i][j])
                    dp[mask | (1 << j)][j] = min(dp[mask | (1 << j)][j], dp[mask][i] + dist[i][j]);
        }
    cout << (ans == 1e9? -1 : ans);

    return 0;
}

Subtask #1
23.0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23816 KB Output is correct
2 Correct 12 ms 23812 KB Output is correct
3 Correct 87 ms 36272 KB Output is correct
4 Correct 93 ms 36308 KB Output is correct
5 Correct 85 ms 36296 KB Output is correct
6 Correct 86 ms 36292 KB Output is correct
7 Correct 83 ms 36432 KB Output is correct
8 Correct 84 ms 36308 KB Output is correct
9 Correct 100 ms 36660 KB Output is correct
10 Correct 83 ms 36300 KB Output is correct
11 Correct 86 ms 36340 KB Output is correct
12 Correct 72 ms 38052 KB Output is correct
13 Correct 72 ms 38740 KB Output is correct
14 Correct 78 ms 37620 KB Output is correct
15 Correct 79 ms 38024 KB Output is correct
16 Correct 76 ms 38860 KB Output is correct
17 Correct 72 ms 38864 KB Output is correct
18 Correct 74 ms 39260 KB Output is correct
19 Correct 86 ms 43184 KB Output is correct
20 Correct 97 ms 43448 KB Output is correct
21 Correct 82 ms 43204 KB Output is correct
22 Correct 12 ms 23892 KB Output is correct
23 Correct 13 ms 23940 KB Output is correct
24 Correct 12 ms 23972 KB Output is correct
25 Correct 12 ms 23936 KB Output is correct
26 Correct 12 ms 23984 KB Output is correct

Subtask #2
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 23856 KB Output is correct
2 Correct 11 ms 23892 KB Output is correct
3 Correct 12 ms 24064 KB Output is correct
4 Correct 12 ms 24032 KB Output is correct
5 Correct 46 ms 66608 KB Output is correct
6 Correct 49 ms 66636 KB Output is correct
7 Correct 46 ms 66636 KB Output is correct
8 Correct 47 ms 66644 KB Output is correct
9 Correct 46 ms 66636 KB Output is correct
10 Correct 45 ms 66660 KB Output is correct
11 Correct 46 ms 66672 KB Output is correct
12 Correct 46 ms 66724 KB Output is correct
13 Correct 46 ms 66652 KB Output is correct
14 Correct 49 ms 66680 KB Output is correct
15 Correct 44 ms 66760 KB Output is correct
16 Correct 46 ms 66660 KB Output is correct
17 Correct 47 ms 66620 KB Output is correct
18 Correct 44 ms 66772 KB Output is correct
19 Correct 45 ms 66824 KB Output is correct
20 Correct 51 ms 66788 KB Output is correct
21 Correct 46 ms 66820 KB Output is correct
22 Correct 46 ms 67100 KB Output is correct
23 Correct 45 ms 67080 KB Output is correct
24 Correct 45 ms 67128 KB Output is correct
25 Correct 491 ms 106240 KB Output is correct

Subtask #3
0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 23816 KB Output is correct
2 Correct 12 ms 23812 KB Output is correct
3 Correct 87 ms 36272 KB Output is correct
4 Correct 93 ms 36308 KB Output is correct
5 Correct 85 ms 36296 KB Output is correct
6 Correct 86 ms 36292 KB Output is correct
7 Correct 83 ms 36432 KB Output is correct
8 Correct 84 ms 36308 KB Output is correct
9 Correct 100 ms 36660 KB Output is correct
10 Correct 83 ms 36300 KB Output is correct
11 Correct 86 ms 36340 KB Output is correct
12 Correct 72 ms 38052 KB Output is correct
13 Correct 72 ms 38740 KB Output is correct
14 Correct 78 ms 37620 KB Output is correct
15 Correct 79 ms 38024 KB Output is correct
16 Correct 76 ms 38860 KB Output is correct
17 Correct 72 ms 38864 KB Output is correct
18 Correct 74 ms 39260 KB Output is correct
19 Correct 86 ms 43184 KB Output is correct
20 Correct 97 ms 43448 KB Output is correct
21 Correct 82 ms 43204 KB Output is correct
22 Correct 12 ms 23892 KB Output is correct
23 Correct 13 ms 23940 KB Output is correct
24 Correct 12 ms 23972 KB Output is correct
25 Correct 12 ms 23936 KB Output is correct
26 Correct 12 ms 23984 KB Output is correct
27 Correct 11 ms 23856 KB Output is correct
28 Correct 11 ms 23892 KB Output is correct
29 Correct 12 ms 24064 KB Output is correct
30 Correct 12 ms 24032 KB Output is correct
31 Correct 46 ms 66608 KB Output is correct
32 Correct 49 ms 66636 KB Output is correct
33 Correct 46 ms 66636 KB Output is correct
34 Correct 47 ms 66644 KB Output is correct
35 Correct 46 ms 66636 KB Output is correct
36 Correct 45 ms 66660 KB Output is correct
37 Correct 46 ms 66672 KB Output is correct
38 Correct 46 ms 66724 KB Output is correct
39 Correct 46 ms 66652 KB Output is correct
40 Correct 49 ms 66680 KB Output is correct
41 Correct 44 ms 66760 KB Output is correct
42 Correct 46 ms 66660 KB Output is correct
43 Correct 47 ms 66620 KB Output is correct
44 Correct 44 ms 66772 KB Output is correct
45 Correct 45 ms 66824 KB Output is correct
46 Correct 51 ms 66788 KB Output is correct
47 Correct 46 ms 66820 KB Output is correct
48 Correct 46 ms 67100 KB Output is correct
49 Correct 45 ms 67080 KB Output is correct
50 Correct 45 ms 67128 KB Output is correct
51 Correct 491 ms 106240 KB Output is correct
52 Execution timed out 2068 ms 160768 KB Time limit exceeded
53 Halted 0 ms 0 KB -