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Submission #757673

# Submission time Handle Problem Language Result Execution time Memory
757673 2023-06-13T14:36:51 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);
    queue<int> cur, next;
    dist[0] = 0;
    cur.push(0);
    int res = 0;
    while (cur.size()) {
        int v = cur.front();
        vis[v] = 1;
        res = max(res, dist[v]);
        for (auto [e, ec]: adj[v]) {
            if (vis[e]) continue;
            vis[e] = 1;
            dist[e] = min(dist[e], dist[v] + ec);
            if (ec) next.push(e);
            else cur.push(e);
        }
        cur.pop();
        if (cur.empty()) {
            cur.swap(next);
            next = {};
        }
    }
    cout << res+1 << '\n';
    

    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 50 ms 19276 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 33 ms 12688 KB Output is correct
5 Correct 6 ms 3796 KB Output is correct
6 Correct 1 ms 320 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 2 ms 596 KB Output is correct
9 Correct 1 ms 596 KB Output is correct
10 Correct 7 ms 3596 KB Output is correct
11 Correct 10 ms 3540 KB Output is correct
12 Correct 19 ms 7104 KB Output is correct
13 Correct 9 ms 3796 KB Output is correct
14 Correct 6 ms 3788 KB Output is correct
15 Correct 47 ms 16876 KB Output is correct
16 Correct 51 ms 19276 KB Output is correct
17 Correct 32 ms 12540 KB Output is correct
18 Correct 35 ms 12624 KB Output is correct

Subtask #2
52.5 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2504 KB Output is correct
2 Correct 184 ms 79496 KB Output is correct
3 Correct 890 ms 672728 KB Output is correct
4 Correct 271 ms 142384 KB Output is correct
5 Correct 914 ms 433196 KB Output is correct
6 Runtime error 1470 ms 1048576 KB Execution killed with signal 9
7 Correct 4 ms 2260 KB Output is correct
8 Correct 4 ms 2504 KB Output is correct
9 Correct 5 ms 3508 KB Output is correct
10 Correct 2 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 181 ms 79456 KB Output is correct
14 Correct 104 ms 46320 KB Output is correct
15 Correct 97 ms 41964 KB Output is correct
16 Correct 83 ms 37116 KB Output is correct
17 Correct 459 ms 203208 KB Output is correct
18 Correct 373 ms 164772 KB Output is correct
19 Correct 273 ms 142424 KB Output is correct
20 Correct 204 ms 148028 KB Output is correct
21 Correct 540 ms 393748 KB Output is correct
22 Correct 897 ms 433408 KB Output is correct
23 Correct 910 ms 392844 KB Output is correct
24 Correct 606 ms 389212 KB Output is correct
25 Correct 1983 ms 662220 KB Output is correct
26 Execution timed out 2097 ms 973180 KB Time limit exceeded
27 Runtime error 1444 ms 1048576 KB Execution killed with signal 9
28 Runtime error 1441 ms 1048576 KB Execution killed with signal 9
29 Runtime error 1441 ms 1048576 KB Execution killed with signal 9
30 Runtime error 1462 ms 1048576 KB Execution killed with signal 9
31 Execution timed out 2092 ms 811824 KB Time limit exceeded
32 Runtime error 1467 ms 1048576 KB Execution killed with signal 9