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Submission #893150

# Submission time Handle Problem Language Result Execution time Memory
893150 2023-12-26T15:04:20 Z vanea Tracks in the Snow (BOI13_tracks) C++14
93.4375 / 100
 973 ms 1048576 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int label = 1, n, m;
const int mxN = 4e3+10;
const int mxN1 = 2e7+10;

vector<int> adj[mxN1];
bool vis[mxN][mxN];
char matrix[mxN][mxN];
int idx[mxN][mxN], d[mxN1];

vector<int> xy = {1, 0, -1, 0}, yx = {0, 1, 0, -1};

void dfs(int i, int j) {
    char c = matrix[i][j];
    idx[i][j] = label;
    vis[i][j] = true;
    for(int k = 0; k < 4; k++) {
        int a = i + xy[k], b = j + yx[k];
        if(a < 0 || a >= n || b < 0 || b >= m) continue;
        if(matrix[a][b] == '.') continue;
        if(matrix[a][b] == c) {
            if(!vis[a][b]) dfs(a, b);
        }
        else {
            if(vis[a][b]) {
                adj[label].push_back(idx[a][b]);
                adj[idx[a][b]].push_back(label);
            }
        }
    }
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> m;
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < m; j++) {
            cin >> matrix[i][j];
        }
    }
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < m; j++) {
            if(matrix[i][j] != '.' && !vis[i][j]) {
                dfs(i, j);
                ++label;
            }
        }
    }
    queue<int> q;
    q.push(1);
    d[1] = 1;
    int ans = 0;
    while(!q.empty()) {
        auto node = q.front();
        q.pop();
        ans = max(ans, d[node]);
        for(auto it : adj[node]) {
            if(d[it] == 0) {
                d[it] = d[node]+1;
                q.push(it);
            }
        }
    }
    cout << ans;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 135 ms 480080 KB Output is correct
2 Correct 107 ms 470492 KB Output is correct
3 Correct 101 ms 470868 KB Output is correct
4 Correct 118 ms 477908 KB Output is correct
5 Correct 107 ms 474196 KB Output is correct
6 Correct 102 ms 470496 KB Output is correct
7 Correct 102 ms 470612 KB Output is correct
8 Correct 103 ms 471044 KB Output is correct
9 Correct 106 ms 471340 KB Output is correct
10 Correct 108 ms 479604 KB Output is correct
11 Correct 105 ms 479572 KB Output is correct
12 Correct 111 ms 480796 KB Output is correct
13 Correct 106 ms 479828 KB Output is correct
14 Correct 106 ms 480080 KB Output is correct
15 Correct 119 ms 485620 KB Output is correct
16 Correct 123 ms 486228 KB Output is correct
17 Correct 117 ms 483272 KB Output is correct
18 Correct 110 ms 484576 KB Output is correct

Subtask #2
63.4375 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 119 ms 517712 KB Output is correct
2 Correct 185 ms 502396 KB Output is correct
3 Correct 550 ms 622168 KB Output is correct
4 Correct 208 ms 528212 KB Output is correct
5 Correct 560 ms 704156 KB Output is correct
6 Correct 826 ms 664096 KB Output is correct
7 Correct 115 ms 564924 KB Output is correct
8 Correct 116 ms 564296 KB Output is correct
9 Correct 103 ms 474964 KB Output is correct
10 Correct 104 ms 474760 KB Output is correct
11 Correct 115 ms 564784 KB Output is correct
12 Correct 105 ms 479312 KB Output is correct
13 Correct 177 ms 513620 KB Output is correct
14 Correct 146 ms 501840 KB Output is correct
15 Correct 137 ms 501804 KB Output is correct
16 Correct 137 ms 489044 KB Output is correct
17 Correct 294 ms 545620 KB Output is correct
18 Correct 238 ms 540756 KB Output is correct
19 Correct 204 ms 528212 KB Output is correct
20 Correct 208 ms 530044 KB Output is correct
21 Correct 362 ms 581720 KB Output is correct
22 Correct 555 ms 704340 KB Output is correct
23 Correct 458 ms 580956 KB Output is correct
24 Correct 347 ms 599132 KB Output is correct
25 Correct 859 ms 645484 KB Output is correct
26 Runtime error 564 ms 1048576 KB Execution killed with signal 9
27 Runtime error 587 ms 1048576 KB Execution killed with signal 9
28 Correct 833 ms 665388 KB Output is correct
29 Correct 806 ms 693908 KB Output is correct
30 Correct 847 ms 789572 KB Output is correct
31 Correct 973 ms 682244 KB Output is correct
32 Runtime error 889 ms 1048576 KB Execution killed with signal 9