oj.uz

Submission #1108166

# Submission time Handle Problem Language Result Execution time Memory
1108166 2024-11-03T06:39:36 Z polarity Tracks in the Snow (BOI13_tracks) C++17
91.25 / 100
 2000 ms 868936 KB 
/**
 * Solution by 1egend (polarity.sh)
 * Date: 2024-10-30
 * Contest: BOI 2013
 * Problem: tracks
**/

#include <bits/stdc++.h>
using namespace std;

#define pb push_back
#define ull unsigned long long
#define ll long long

const int MAX_N = 1e5 + 1;
const ll MOD = 1e9 + 7;

vector<pair<int, int>> cardinal = {{0, 1}, {0, -1}, {1, 0}, {-1, 0}};
vector<vector<int>> grid;
vector<vector<int>> component;

void floodfill(int i, int j, int n, int l){
    if (grid[i][j] != l || component[i][j] != 0){
        return;
    }

    component[i][j] = n;

    for (pair<int, int> t : cardinal){
        floodfill(i + t.first, j + t.second, n, l);
    }
}

void solve(){
    int h, w; cin >> h >> w;
    grid = vector<vector<int>>(h + 2, vector<int>(w + 2, 0));
    component = grid;
    for (int i = 0; i < h; i++){
        string s; cin >> s;
        for (int j = 0; j < w; j++){
            char t = s[j];

            if (t == 'F'){
                grid[i + 1][j + 1] = 2;
            } else if (t == 'R'){
                grid[i + 1][j + 1] = 1;
            }
        }
    }

    int k = 1;

    for (int i = 1; i < h + 1; i++){
        for (int j = 1; j < w + 1; j++){
            if (component[i][j] == 0 && grid[i][j] != 0){
                floodfill(i, j, k, grid[i][j]);
                k++;
            }
        }
    }

    vector<vector<int>> adj(k + 1);

    map<pair<int, int>, int> edge;

    for (int i = 1; i < h + 1; i++){
        for (int j = 1; j < w + 1; j++){
            int x = component[i][j];
            for (pair<int, int> t : cardinal){
                int y = component[i + t.first][j + t.second];
                if (x != 0 && y != 0 && x != y && edge[{x, y}] == 0 && edge[{y,x}] == 0){
                    edge[{x, y}] = 1;
                    edge[{y, x}] = 1;
                    adj[x].pb(y);
                    adj[y].pb(x);
                }
            }
        }
    }

    vector<int> dist(k + 1, -1);

    int ans = 0;

    queue<int> curr;
    curr.push(1);
    dist[1] = 0;

    while(!curr.empty()){
        int comp = curr.front();
        curr.pop();
        
        for (int node : adj[comp]){
            if (dist[node] != -1){
                continue;
            }

            dist[node] = dist[comp] + 1;
            ans = max(ans, dist[node]);

            curr.push(node);
        }
    }

    cout << ans + 1 << endl;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    solve();
    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 84 ms 11592 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 13 ms 2756 KB Output is correct
5 Correct 12 ms 2652 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 336 KB Output is correct
8 Correct 2 ms 336 KB Output is correct
9 Correct 2 ms 592 KB Output is correct
10 Correct 10 ms 2652 KB Output is correct
11 Correct 4 ms 1360 KB Output is correct
12 Correct 27 ms 4424 KB Output is correct
13 Correct 10 ms 2640 KB Output is correct
14 Correct 10 ms 2640 KB Output is correct
15 Correct 64 ms 10852 KB Output is correct
16 Correct 89 ms 11592 KB Output is correct
17 Correct 48 ms 10240 KB Output is correct
18 Correct 13 ms 2896 KB Output is correct

Subtask #2
61.25 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 2384 KB Output is correct
2 Correct 275 ms 55012 KB Output is correct
3 Correct 1802 ms 413784 KB Output is correct
4 Correct 411 ms 80712 KB Output is correct
5 Execution timed out 2065 ms 730208 KB Time limit exceeded
6 Correct 1820 ms 266980 KB Output is correct
7 Correct 5 ms 2128 KB Output is correct
8 Correct 5 ms 2308 KB Output is correct
9 Correct 9 ms 2384 KB Output is correct
10 Correct 2 ms 1360 KB Output is correct
11 Correct 3 ms 1752 KB Output is correct
12 Correct 7 ms 2640 KB Output is correct
13 Correct 264 ms 54348 KB Output is correct
14 Correct 155 ms 31560 KB Output is correct
15 Correct 172 ms 35656 KB Output is correct
16 Correct 131 ms 25672 KB Output is correct
17 Correct 716 ms 139840 KB Output is correct
18 Correct 756 ms 134476 KB Output is correct
19 Correct 370 ms 80076 KB Output is correct
20 Correct 371 ms 94540 KB Output is correct
21 Correct 1075 ms 251532 KB Output is correct
22 Execution timed out 2122 ms 758332 KB Time limit exceeded
23 Correct 1443 ms 274044 KB Output is correct
24 Correct 1086 ms 354520 KB Output is correct
25 Execution timed out 2066 ms 473472 KB Time limit exceeded
26 Correct 1103 ms 868936 KB Output is correct
27 Correct 753 ms 316164 KB Output is correct
28 Correct 1932 ms 263756 KB Output is correct
29 Correct 1617 ms 224648 KB Output is correct
30 Correct 1339 ms 256156 KB Output is correct
31 Execution timed out 2085 ms 288864 KB Time limit exceeded
32 Correct 946 ms 424588 KB Output is correct