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Submission #867776

# Submission time Handle Problem Language Result Execution time Memory
867776 2023-10-29T12:52:03 Z BoopyTheNoob Tracks in the Snow (BOI13_tracks) C++14
100 / 100
 393 ms 119008 KB 
#include <bits/stdc++.h>
using namespace std;

int dx[4]{1, -1, 0, 0}, dy[4]{0, 0, 1, -1};
int N, M, dist[4000][4000], ans = 1;
string grid[4000];

int main (void) {
    iostream::sync_with_stdio(false);
	cin.tie(0);
    cin >> N >> M;
    //vector<string> grid(N);
    for (int i = 0; i < N; i++)
        cin >> grid[i];
    //vector<vector<int>> dist(N, vector<int>(M, 0));
    deque<pair<int, int>> bfs;
    bfs.push_back({0, 0});
    dist[0][0] = 1;

    while (!bfs.empty()) {
        int x = bfs.front().first, y = bfs.front().second;
        bfs.pop_front();
        ans = max(ans, dist[x][y]);
        for (int i = 0; i < 4; i++) {
            int nx = x + dx[i], ny = y + dy[i];
            /*if (nx < 0 || nx >= N || ny < 0 || ny >= M)
                continue;
            if (dist[nx][ny] != 0 || grid[nx][ny] == '.')
                continue;
            pair<int, int> next = {nx, ny};
            if (grid[x][y] != grid[nx][ny]) {
                dist[nx][ny] = dist[x][y] + 1;
                bfs.push_back({nx, ny});
            } else {
                dist[nx][ny] = dist[x][y];
                bfs.push_front({nx, ny});
            }*/
            if (nx >= 0 && nx < N && ny >= 0 && ny < M && grid[nx][ny] != '.' && dist[nx][ny] == 0) {
                if (grid[nx][ny] != grid[x][y]) {
                    dist[nx][ny] = dist[x][y] + 1;
                    bfs.push_back({nx, ny});
                } else {
                    dist[nx][ny] = dist[x][y];
                    bfs.push_front({nx, ny});
                }
            }
        }
    }
    /*for (auto x: dist) {
        for (auto y: x) {
            cout << y << " ";
        }
        cout << endl;
    }*/
    cout << ans;
    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 3676 KB Output is correct
2 Correct 0 ms 604 KB Output is correct
3 Correct 0 ms 604 KB Output is correct
4 Correct 5 ms 3480 KB Output is correct
5 Correct 2 ms 1884 KB Output is correct
6 Correct 0 ms 604 KB Output is correct
7 Correct 0 ms 604 KB Output is correct
8 Correct 1 ms 860 KB Output is correct
9 Correct 1 ms 860 KB Output is correct
10 Correct 2 ms 1628 KB Output is correct
11 Correct 1 ms 1628 KB Output is correct
12 Correct 4 ms 2136 KB Output is correct
13 Correct 2 ms 1880 KB Output is correct
14 Correct 2 ms 1880 KB Output is correct
15 Correct 8 ms 3416 KB Output is correct
16 Correct 8 ms 3676 KB Output is correct
17 Correct 6 ms 3420 KB Output is correct
18 Correct 4 ms 3420 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 15964 KB Output is correct
2 Correct 26 ms 10368 KB Output is correct
3 Correct 146 ms 59988 KB Output is correct
4 Correct 43 ms 25660 KB Output is correct
5 Correct 111 ms 42836 KB Output is correct
6 Correct 393 ms 94608 KB Output is correct
7 Correct 7 ms 16472 KB Output is correct
8 Correct 7 ms 15964 KB Output is correct
9 Correct 1 ms 860 KB Output is correct
10 Correct 1 ms 604 KB Output is correct
11 Correct 7 ms 16220 KB Output is correct
12 Correct 1 ms 1116 KB Output is correct
13 Correct 25 ms 10332 KB Output is correct
14 Correct 15 ms 7004 KB Output is correct
15 Correct 11 ms 9304 KB Output is correct
16 Correct 13 ms 4440 KB Output is correct
17 Correct 74 ms 21584 KB Output is correct
18 Correct 51 ms 28184 KB Output is correct
19 Correct 44 ms 25688 KB Output is correct
20 Correct 35 ms 19036 KB Output is correct
21 Correct 86 ms 41452 KB Output is correct
22 Correct 110 ms 42836 KB Output is correct
23 Correct 132 ms 34644 KB Output is correct
24 Correct 86 ms 38636 KB Output is correct
25 Correct 280 ms 80724 KB Output is correct
26 Correct 221 ms 119008 KB Output is correct
27 Correct 293 ms 107260 KB Output is correct
28 Correct 391 ms 94608 KB Output is correct
29 Correct 378 ms 92716 KB Output is correct
30 Correct 345 ms 97240 KB Output is correct
31 Correct 317 ms 62156 KB Output is correct
32 Correct 253 ms 92696 KB Output is correct