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Submission #880003

# Submission time Handle Problem Language Result Execution time Memory
880003 2023-11-28T14:45:09 Z SpyrosAliv Tracks in the Snow (BOI13_tracks) C++14
43.125 / 100
 2000 ms 36440 KB 
#include <bits/stdc++.h>
using namespace std;

vector<vector<char>> grid(4001, vector<char>(4001));
vector<vector<bool>> visited(4001, vector<bool>(4001, false));
vector<pair<int, int>> delta = {{-1, 0}, {0, -1}, {1, 0}, {0, 1}};
map<char, char> hm;
int n, m, steps = 0;

bool inBounds(int i, int j) {
    if (i < 0 || i >= n || j < 0 || j >= m) return 0;
    return 1;
}

void bfs() {
    int i = n-1, j = m-1;
    queue<pair<int, int>> q;
    q.push({i, j});
    vector<vector<bool>> bfsVisited(n, vector<bool>(m, false));
    bfsVisited[i][j] = true;
    while (!q.empty()) {
        int currRow = q.front().first;
        int currCol = q.front().second;
        grid[currRow][currCol] = hm[grid[currRow][currCol]];
        if (!visited[currRow][currCol]) {
            visited[currRow][currCol] = true;
            steps--;
        }
        q.pop();
        for (int i = 0; i < 4; i++) {
            int nextRow = currRow + delta[i].first;
            int nextCol = currCol + delta[i].second;
            if (inBounds(nextRow, nextCol) 
                && !bfsVisited[nextRow][nextCol] 
                && grid[nextRow][nextCol] != '.'
                && grid[nextRow][nextCol] != grid[currRow][currCol]) {
                q.push({nextRow, nextCol});
                bfsVisited[nextRow][nextCol] = true;
            }
        }
    }
}

int main() {
    cin >> n >> m;
    hm['F'] = 'R';
    hm['R'] = 'F';
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cin >> grid[i][j];
            if (grid[i][j] == '.') visited[i][j] = true;
            else steps++;
        }
    }
    int animals = 0;
    while (steps > 0) {
        animals++;
        bfs();
    }
    cout << animals << "\n";
    return 0;
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 174 ms 18524 KB Output is correct
2 Correct 11 ms 18264 KB Output is correct
3 Correct 12 ms 18268 KB Output is correct
4 Correct 30 ms 18524 KB Output is correct
5 Correct 73 ms 18428 KB Output is correct
6 Correct 11 ms 18264 KB Output is correct
7 Correct 12 ms 18228 KB Output is correct
8 Correct 12 ms 18268 KB Output is correct
9 Correct 13 ms 18268 KB Output is correct
10 Correct 84 ms 18448 KB Output is correct
11 Correct 17 ms 18908 KB Output is correct
12 Correct 61 ms 18524 KB Output is correct
13 Correct 78 ms 18520 KB Output is correct
14 Correct 72 ms 18444 KB Output is correct
15 Correct 427 ms 18552 KB Output is correct
16 Correct 173 ms 18520 KB Output is correct
17 Correct 431 ms 18612 KB Output is correct
18 Correct 29 ms 18524 KB Output is correct

Subtask #2
13.125 / 70.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2053 ms 18628 KB Time limit exceeded
2 Execution timed out 2052 ms 20196 KB Time limit exceeded
3 Execution timed out 2071 ms 36440 KB Time limit exceeded
4 Execution timed out 2066 ms 22664 KB Time limit exceeded
5 Execution timed out 2037 ms 28264 KB Time limit exceeded
6 Execution timed out 2056 ms 36344 KB Time limit exceeded
7 Correct 1820 ms 18616 KB Output is correct
8 Execution timed out 2057 ms 18628 KB Time limit exceeded
9 Correct 142 ms 18268 KB Output is correct
10 Correct 348 ms 18440 KB Output is correct
11 Correct 750 ms 18732 KB Output is correct
12 Correct 1537 ms 18280 KB Output is correct
13 Execution timed out 2028 ms 20200 KB Time limit exceeded
14 Execution timed out 2033 ms 19296 KB Time limit exceeded
15 Execution timed out 2052 ms 19540 KB Time limit exceeded
16 Execution timed out 2040 ms 19024 KB Time limit exceeded
17 Execution timed out 2059 ms 22744 KB Time limit exceeded
18 Execution timed out 2040 ms 22864 KB Time limit exceeded
19 Execution timed out 2037 ms 22624 KB Time limit exceeded
20 Execution timed out 2032 ms 22232 KB Time limit exceeded
21 Execution timed out 2096 ms 28756 KB Time limit exceeded
22 Execution timed out 2007 ms 28380 KB Time limit exceeded
23 Execution timed out 2039 ms 27096 KB Time limit exceeded
24 Execution timed out 2013 ms 28520 KB Time limit exceeded
25 Execution timed out 2029 ms 36220 KB Time limit exceeded
26 Correct 747 ms 32096 KB Output is correct
27 Execution timed out 2037 ms 36176 KB Time limit exceeded
28 Execution timed out 2015 ms 36156 KB Time limit exceeded
29 Execution timed out 2073 ms 36180 KB Time limit exceeded
30 Execution timed out 2054 ms 35884 KB Time limit exceeded
31 Execution timed out 2036 ms 29868 KB Time limit exceeded
32 Execution timed out 2040 ms 36176 KB Time limit exceeded