oj.uz

Submission #703562

# Submission time Handle Problem Language Result Execution time Memory
703562 2023-02-27T16:53:40 Z bebra Nautilus (BOI19_nautilus) C++17
66 / 100
 1000 ms 125596 KB 
#include <bits/stdc++.h>
using namespace std;

#define dbg(x) cerr << #x << ": " << x << endl;

const int MAX_N = 500 + 5;
const int MAX_M = 5000 + 5;
string a[MAX_N];

vector<pair<int, int>> delta = {{1, 0}, {-1, 0}, {0, 1}, {0, -1}};

bool dp[MAX_N][MAX_N][MAX_N];


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, m, t;
    cin >> n >> m >> t;
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
    }

    string s;
    cin >> s;
    reverse(s.begin(), s.end());

    vector<vector<pair<int, int>>> dir(t);
    for (int i = 0; i < t; ++i) {
        auto c = s[i];
        if (c == 'N') {
            dir[i] = {delta[0]};
        } else if (c == 'S') {
            dir[i] = {delta[1]};
        } else if (c == 'W') {
            dir[i] = {delta[2]};
        } else if (c == 'E') {
            dir[i] = {delta[3]};
        } else {
            dir[i] = delta;
        }
    }
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < m; ++j) {
            dp[i][j][t] = (a[i][j] == '#' ? 0 : 1);
        }
    }
    // reverse the operations and check if there exists at least one starting position
    for (int k = t - 1; k >= 0; --k) {
        for (const auto& [di, dj] : dir[k])  {
            for (int i = 0; i < n; ++i) {
                for (int j = 0; j < m; ++j) {
                    if (a[i][j] == '#') continue;
                    if (i + di < 0 || i + di >= n || j + dj < 0 || j + dj >= m) continue;
                    dp[i][j][k] |= dp[i + di][j + dj][k + 1];
                }
            }
        }
    }

    int ans = 0;
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < m; ++j) {
            ans += dp[i][j][0];
        }
    }

    cout << ans << '\n';

    
    return 0;
}

Subtask #1
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5588 KB Output is correct
2 Correct 7 ms 5692 KB Output is correct
3 Correct 7 ms 5688 KB Output is correct
4 Correct 7 ms 5588 KB Output is correct
5 Correct 6 ms 5588 KB Output is correct
6 Correct 3 ms 5676 KB Output is correct

Subtask #2
37.0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5588 KB Output is correct
2 Correct 7 ms 5692 KB Output is correct
3 Correct 7 ms 5688 KB Output is correct
4 Correct 7 ms 5588 KB Output is correct
5 Correct 6 ms 5588 KB Output is correct
6 Correct 3 ms 5676 KB Output is correct
7 Correct 13 ms 5608 KB Output is correct
8 Correct 10 ms 5588 KB Output is correct
9 Correct 11 ms 5588 KB Output is correct
10 Correct 10 ms 5588 KB Output is correct
11 Correct 4 ms 5588 KB Output is correct
12 Correct 15 ms 5692 KB Output is correct
13 Correct 15 ms 5692 KB Output is correct
14 Correct 16 ms 5692 KB Output is correct
15 Correct 13 ms 5716 KB Output is correct
16 Correct 5 ms 5588 KB Output is correct
17 Correct 19 ms 5616 KB Output is correct
18 Correct 19 ms 5692 KB Output is correct
19 Correct 19 ms 5588 KB Output is correct
20 Correct 15 ms 5688 KB Output is correct
21 Correct 6 ms 5588 KB Output is correct

Subtask #3
0 / 34.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 5588 KB Output is correct
2 Correct 7 ms 5692 KB Output is correct
3 Correct 7 ms 5688 KB Output is correct
4 Correct 7 ms 5588 KB Output is correct
5 Correct 6 ms 5588 KB Output is correct
6 Correct 3 ms 5676 KB Output is correct
7 Correct 13 ms 5608 KB Output is correct
8 Correct 10 ms 5588 KB Output is correct
9 Correct 11 ms 5588 KB Output is correct
10 Correct 10 ms 5588 KB Output is correct
11 Correct 4 ms 5588 KB Output is correct
12 Correct 15 ms 5692 KB Output is correct
13 Correct 15 ms 5692 KB Output is correct
14 Correct 16 ms 5692 KB Output is correct
15 Correct 13 ms 5716 KB Output is correct
16 Correct 5 ms 5588 KB Output is correct
17 Correct 19 ms 5616 KB Output is correct
18 Correct 19 ms 5692 KB Output is correct
19 Correct 19 ms 5588 KB Output is correct
20 Correct 15 ms 5688 KB Output is correct
21 Correct 6 ms 5588 KB Output is correct
22 Execution timed out 1092 ms 125596 KB Time limit exceeded
23 Halted 0 ms 0 KB -