oj.uz

Submission #1018336

# Submission time Handle Problem Language Result Execution time Memory
1018336 2024-07-09T19:08:35 Z cryptobunny Tracks in the Snow (BOI13_tracks) C++14
100 / 100
 996 ms 122716 KB 
#include <bits/stdc++.h>
using namespace std;

int dx[4] = {0, 0, -1, 1};
int dy[4] = {-1, 1, 0, 0};

int main() {
    int h, w;
    cin >> h >> w;
    vector<vector<char>> grid(h, vector<char>(w));
    int cnt = 0;
    for (int i = 0; i < h; i++) {
        for (int j = 0; j < w; j++) {
            cin >> grid[i][j];
            if (grid[i][j] != '.') cnt++;
        }
    }
    deque<pair<int, int>> dq;
    vector<vector<int>> dist(h, vector<int>(w, 0x3f3f3f3f));
//    vector<vector<int>> vis(h, vector<int>(w));
    dist[0][0] = 0;
    dq.push_front({0, 0});
    while (!dq.empty()) {
        auto tp = dq.front();
        dq.pop_front();
//        cout << 61 - cnt << "\t" << tp.first << " " << tp.second << endl;
        cnt--;
        if (cnt == 0) {
            break;
        }
        for (int i = 0; i < 4; i++) {
            int nx = tp.first + dx[i];
            int ny = tp.second + dy[i];
            if (nx < 0 || nx >= h || ny < 0 || ny >= w) continue;
            if (grid[nx][ny] == '.') continue;
            int cost = 1;
            if (grid[nx][ny] == grid[tp.first][tp.second]) cost = 0;
//            cout << vis[nx][ny] << "     " << nx << "  " << ny << endl;
            if (dist[tp.first][tp.second] + cost < dist[nx][ny]) {
//                vis[nx][ny] = true;
                dist[nx][ny] = dist[tp.first][tp.second] + cost;
                if (cost == 1) {
                    dq.push_back({nx, ny});
                } else {
                    dq.push_front({nx, ny});
                }
            }
        }
    }
    int ans = 0;
    for (int i = 0; i < h; i++) {
        for (int j = 0; j < w; j++) {
            if (grid[i][j] != '.') ans = max(ans, dist[i][j]);
        }
        cout << endl;
    }
    cout << ans + 1 << endl;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 1884 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 10 ms 1372 KB Output is correct
5 Correct 4 ms 860 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 344 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 3 ms 604 KB Output is correct
11 Correct 3 ms 604 KB Output is correct
12 Correct 6 ms 860 KB Output is correct
13 Correct 4 ms 860 KB Output is correct
14 Correct 4 ms 860 KB Output is correct
15 Correct 15 ms 2016 KB Output is correct
16 Correct 15 ms 1884 KB Output is correct
17 Correct 14 ms 1688 KB Output is correct
18 Correct 10 ms 1372 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 860 KB Output is correct
2 Correct 71 ms 9664 KB Output is correct
3 Correct 581 ms 94416 KB Output is correct
4 Correct 146 ms 22440 KB Output is correct
5 Correct 369 ms 53588 KB Output is correct
6 Correct 984 ms 107480 KB Output is correct
7 Correct 9 ms 860 KB Output is correct
8 Correct 6 ms 860 KB Output is correct
9 Correct 3 ms 604 KB Output is correct
10 Correct 1 ms 604 KB Output is correct
11 Correct 8 ms 860 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 70 ms 9472 KB Output is correct
14 Correct 41 ms 5716 KB Output is correct
15 Correct 39 ms 6280 KB Output is correct
16 Correct 31 ms 4184 KB Output is correct
17 Correct 192 ms 24292 KB Output is correct
18 Correct 150 ms 23888 KB Output is correct
19 Correct 170 ms 22352 KB Output is correct
20 Correct 131 ms 20724 KB Output is correct
21 Correct 348 ms 55208 KB Output is correct
22 Correct 358 ms 53464 KB Output is correct
23 Correct 371 ms 45908 KB Output is correct
24 Correct 339 ms 53936 KB Output is correct
25 Correct 656 ms 94800 KB Output is correct
26 Correct 752 ms 122716 KB Output is correct
27 Correct 987 ms 114560 KB Output is correct
28 Correct 994 ms 107368 KB Output is correct
29 Correct 996 ms 106188 KB Output is correct
30 Correct 969 ms 105828 KB Output is correct
31 Correct 680 ms 61016 KB Output is correct
32 Correct 956 ms 107360 KB Output is correct