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Submission #757701

# Submission time Handle Problem Language Result Execution time Memory
757701 2023-06-13T15:05:15 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, cur;
    vector<int> stk;
    stk.reserve(1e9);
    auto dfs = [&](int i, int d) -> void {
        stk.clear();
        stk.push_back(i);
        while (stk.size()) {
            int i = stk.back();
            stk.pop_back();
            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
                    stk.push_back(e);
            }
            res = max(res, dist[i]);
        }
    };
    dfs(0, 1);
    for (int d = 2; edge.size(); d ++) {
        cur.clear();
        swap(cur, edge);
        for (int k : cur)
            dfs(k, d);
    }
    cout << res << '\n';
    
    

    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 48 ms 19176 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 468 KB Output is correct
4 Correct 32 ms 12712 KB Output is correct
5 Correct 6 ms 3796 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 720 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 7 ms 3540 KB Output is correct
11 Correct 8 ms 3572 KB Output is correct
12 Correct 19 ms 7056 KB Output is correct
13 Correct 7 ms 3724 KB Output is correct
14 Correct 7 ms 3796 KB Output is correct
15 Correct 39 ms 16808 KB Output is correct
16 Correct 53 ms 19148 KB Output is correct
17 Correct 30 ms 12500 KB Output is correct
18 Correct 34 ms 12716 KB Output is correct

Subtask #2
52.5 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2388 KB Output is correct
2 Correct 155 ms 79192 KB Output is correct
3 Correct 915 ms 671992 KB Output is correct
4 Correct 248 ms 142176 KB Output is correct
5 Correct 739 ms 432908 KB Output is correct
6 Runtime error 1927 ms 1048576 KB Execution killed with signal 9
7 Correct 4 ms 2132 KB Output is correct
8 Correct 4 ms 2388 KB Output is correct
9 Correct 6 ms 3412 KB Output is correct
10 Correct 3 ms 1620 KB Output is correct
11 Correct 3 ms 2132 KB Output is correct
12 Correct 3 ms 1364 KB Output is correct
13 Correct 165 ms 79184 KB Output is correct
14 Correct 88 ms 46028 KB Output is correct
15 Correct 89 ms 41724 KB Output is correct
16 Correct 76 ms 36764 KB Output is correct
17 Correct 424 ms 202956 KB Output is correct
18 Correct 342 ms 164392 KB Output is correct
19 Correct 275 ms 142252 KB Output is correct
20 Correct 217 ms 147696 KB Output is correct
21 Correct 546 ms 393428 KB Output is correct
22 Correct 739 ms 432932 KB Output is correct
23 Correct 776 ms 392520 KB Output is correct
24 Correct 570 ms 388928 KB Output is correct
25 Correct 1874 ms 661904 KB Output is correct
26 Execution timed out 2104 ms 991036 KB Time limit exceeded
27 Runtime error 1752 ms 1048576 KB Execution killed with signal 9
28 Runtime error 1735 ms 1048576 KB Execution killed with signal 9
29 Runtime error 1654 ms 1048576 KB Execution killed with signal 9
30 Runtime error 1708 ms 1048576 KB Execution killed with signal 9
31 Execution timed out 2113 ms 812256 KB Time limit exceeded
32 Runtime error 1657 ms 1048576 KB Execution killed with signal 9