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Submission #757691

# Submission time Handle Problem Language Result Execution time Memory
757691 2023-06-13T14:54:12 Z drdilyor Tracks in the Snow (BOI13_tracks) C++17
82.5 / 100
 2000 ms 1048576 KB 
#include <bits/stdc++.h>

using namespace std;
using ll = long long;

signed main() {
    cin.tie(0)->sync_with_stdio(0);
    int n, m;
    cin >> n >> m;
    vector<string> mat(n);
    for (string& s : mat) {
        cin >> s;
    }
    auto id = [m](int i, int j) { return i* m + j;};
    vector<vector<pair<int,int>>> adj(n * m);

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            for (auto [di, dj] : {pair{0, -1}, {0, 1}, {-1, 0}, {1, 0}}) {
                int ni = i + di;
                int nj = j + dj;
                if (clamp(ni, 0,n-1) == ni && clamp(nj, 0, m-1) == nj) {
                    if (mat[ni][nj] == '.' || mat[i][j] == '.') continue;
                    int c = mat[i][j] != mat[ni][nj];
                    adj[id(i, j)].push_back({id(ni, nj), c});
                }
            }
        }
    }

    static constexpr int inf = 1e9;
    vector<int> dist(n*m, inf), vis(n*m, 0);
    int res = 0;
    vector<int> edge;
    auto dfs = [&](auto& dfs, int i, int d) -> void {
        vis[i] = 1;
        dist[i] = d;
        for (auto [e, ec]: adj[i]) {
            if (vis[e]) continue;
            if (ec) {if (!vis[e]) edge.push_back(e);}
            else
                dfs(dfs, e, d);
        }
        res = max(res, dist[i]);
    };
    dfs(dfs, 0, 1);
    for (int d = 2; edge.size(); d ++) {
        auto cur = std::move(edge);
        for (int k : cur)
            dfs(dfs, k, d);
    }
    cout << res << '\n';
    
    

    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 52 ms 19448 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 34 ms 13216 KB Output is correct
5 Correct 10 ms 3748 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 2 ms 724 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 6 ms 3540 KB Output is correct
11 Correct 7 ms 3796 KB Output is correct
12 Correct 18 ms 7120 KB Output is correct
13 Correct 8 ms 3796 KB Output is correct
14 Correct 6 ms 3796 KB Output is correct
15 Correct 42 ms 16784 KB Output is correct
16 Correct 54 ms 19468 KB Output is correct
17 Correct 29 ms 12572 KB Output is correct
18 Correct 30 ms 13204 KB Output is correct

Subtask #2
52.5 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 2516 KB Output is correct
2 Correct 158 ms 79428 KB Output is correct
3 Correct 1014 ms 672464 KB Output is correct
4 Correct 275 ms 142796 KB Output is correct
5 Correct 709 ms 433472 KB Output is correct
6 Runtime error 1612 ms 1048576 KB Execution killed with signal 9
7 Correct 4 ms 2388 KB Output is correct
8 Correct 4 ms 2644 KB Output is correct
9 Correct 6 ms 3712 KB Output is correct
10 Correct 2 ms 1748 KB Output is correct
11 Correct 3 ms 2384 KB Output is correct
12 Correct 2 ms 1364 KB Output is correct
13 Correct 187 ms 79992 KB Output is correct
14 Correct 92 ms 46800 KB Output is correct
15 Correct 88 ms 42308 KB Output is correct
16 Correct 83 ms 37524 KB Output is correct
17 Correct 423 ms 203784 KB Output is correct
18 Correct 371 ms 165216 KB Output is correct
19 Correct 248 ms 142960 KB Output is correct
20 Correct 232 ms 148508 KB Output is correct
21 Correct 579 ms 394700 KB Output is correct
22 Correct 723 ms 434072 KB Output is correct
23 Correct 801 ms 393732 KB Output is correct
24 Correct 580 ms 390052 KB Output is correct
25 Correct 1936 ms 663240 KB Output is correct
26 Runtime error 1483 ms 1048576 KB Execution killed with signal 9
27 Runtime error 1767 ms 1048576 KB Execution killed with signal 9
28 Runtime error 1603 ms 1048576 KB Execution killed with signal 9
29 Runtime error 1592 ms 1048576 KB Execution killed with signal 9
30 Runtime error 1629 ms 1048576 KB Execution killed with signal 9
31 Execution timed out 2108 ms 814712 KB Time limit exceeded
32 Runtime error 1522 ms 1048576 KB Execution killed with signal 9