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Submission #757692

# Submission time Handle Problem Language Result Execution time Memory
757692 2023-06-13T14:55:16 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) {vis[e] = 1, 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 63 ms 19528 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 35 ms 13260 KB Output is correct
5 Correct 7 ms 3796 KB Output is correct
6 Correct 1 ms 320 KB Output is correct
7 Correct 2 ms 340 KB Output is correct
8 Correct 2 ms 708 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 6 ms 3664 KB Output is correct
11 Correct 9 ms 3788 KB Output is correct
12 Correct 20 ms 7164 KB Output is correct
13 Correct 7 ms 3796 KB Output is correct
14 Correct 8 ms 3796 KB Output is correct
15 Correct 45 ms 17012 KB Output is correct
16 Correct 50 ms 19648 KB Output is correct
17 Correct 29 ms 12692 KB Output is correct
18 Correct 31 ms 13224 KB Output is correct

Subtask #2
52.5 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 2548 KB Output is correct
2 Correct 168 ms 80332 KB Output is correct
3 Correct 949 ms 673976 KB Output is correct
4 Correct 255 ms 143384 KB Output is correct
5 Correct 759 ms 434520 KB Output is correct
6 Runtime error 1640 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 7 ms 3716 KB Output is correct
10 Correct 3 ms 1748 KB Output is correct
11 Correct 3 ms 2260 KB Output is correct
12 Correct 4 ms 1364 KB Output is correct
13 Correct 151 ms 79700 KB Output is correct
14 Correct 91 ms 46460 KB Output is correct
15 Correct 96 ms 42072 KB Output is correct
16 Correct 83 ms 37152 KB Output is correct
17 Correct 402 ms 203476 KB Output is correct
18 Correct 392 ms 165104 KB Output is correct
19 Correct 260 ms 142860 KB Output is correct
20 Correct 223 ms 148344 KB Output is correct
21 Correct 612 ms 394688 KB Output is correct
22 Correct 767 ms 433968 KB Output is correct
23 Correct 786 ms 393688 KB Output is correct
24 Correct 606 ms 390076 KB Output is correct
25 Correct 1925 ms 663044 KB Output is correct
26 Runtime error 1557 ms 1048576 KB Execution killed with signal 9
27 Runtime error 1678 ms 1048576 KB Execution killed with signal 9
28 Runtime error 1695 ms 1048576 KB Execution killed with signal 9
29 Runtime error 1698 ms 1048576 KB Execution killed with signal 9
30 Runtime error 1699 ms 1048576 KB Execution killed with signal 9
31 Execution timed out 2071 ms 812840 KB Time limit exceeded
32 Runtime error 1627 ms 1048576 KB Execution killed with signal 9