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Submission #867773

# Submission time Handle Problem Language Result Execution time Memory
867773 2023-10-29T12:50:21 Z BoopyTheNoob Tracks in the Snow (BOI13_tracks) C++14
100 / 100
 391 ms 118816 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 3672 KB Output is correct
2 Correct 0 ms 604 KB Output is correct
3 Correct 0 ms 604 KB Output is correct
4 Correct 6 ms 3424 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 1752 KB Output is correct
11 Correct 2 ms 1628 KB Output is correct
12 Correct 3 ms 2140 KB Output is correct
13 Correct 2 ms 1884 KB Output is correct
14 Correct 2 ms 1884 KB Output is correct
15 Correct 7 ms 3412 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 3288 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 10320 KB Output is correct
3 Correct 146 ms 59732 KB Output is correct
4 Correct 43 ms 25728 KB Output is correct
5 Correct 111 ms 42832 KB Output is correct
6 Correct 391 ms 94384 KB Output is correct
7 Correct 8 ms 16476 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 26 ms 10332 KB Output is correct
14 Correct 15 ms 7004 KB Output is correct
15 Correct 11 ms 9308 KB Output is correct
16 Correct 13 ms 4480 KB Output is correct
17 Correct 69 ms 21300 KB Output is correct
18 Correct 53 ms 28264 KB Output is correct
19 Correct 51 ms 25796 KB Output is correct
20 Correct 35 ms 19148 KB Output is correct
21 Correct 87 ms 41388 KB Output is correct
22 Correct 112 ms 42748 KB Output is correct
23 Correct 132 ms 34616 KB Output is correct
24 Correct 91 ms 38812 KB Output is correct
25 Correct 295 ms 80720 KB Output is correct
26 Correct 221 ms 118816 KB Output is correct
27 Correct 285 ms 107396 KB Output is correct
28 Correct 385 ms 94444 KB Output is correct
29 Correct 389 ms 92872 KB Output is correct
30 Correct 346 ms 97120 KB Output is correct
31 Correct 325 ms 62068 KB Output is correct
32 Correct 245 ms 92556 KB Output is correct