Submission #784363

#	Time	Username	Problem	Language	Result	Execution time	Memory
784363		raysh07	Nautilus (BOI19_nautilus)	C++17	100 / 100	197 ms	157580 KiB

nautilus

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define INF (int)1e18

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

bitset <505> dp[505][5005], grid[505];

void Solve()
{
	int n, m, q; cin >> n >> m >> q;
	vector <string> a(n);
	for (auto &x : a) cin >> x;

	string s; cin >> s;
	
	for (int i = 1; i <= n; i++){
		for (int j = 1; j <= m; j++){
			if (a[i - 1][j - 1] == '.') {
				grid[i][j] = 1;
				dp[i][0][j] = 1;
			}
		}
	}

	int c = 1;

	for (auto &x : s){
		for (int i = 1; i <= n; i++){
			if (x == 'N' || x == '?') dp[i][c] |= (dp[i + 1][c - 1] & grid[i]);
			if (x == 'S' || x == '?') dp[i][c] |= (dp[i - 1][c - 1] & grid[i]);
			if (x == 'E' || x == '?') dp[i][c] |= ((dp[i][c - 1] << 1) & grid[i]);
			if (x == 'W' || x == '?') dp[i][c] |= ((dp[i][c - 1] >> 1) & grid[i]);
		}
		c++;
	}

	int ans = 0;
	for (int i = 1; i <= n; i++){
		for (int j = 1; j <= m; j++){
			ans += dp[i][q][j];
		}
	}

	cout << ans << "\n";
}

int32_t main() 
{
    auto begin = std::chrono::high_resolution_clock::now();
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t = 1;

   // freopen("in",  "r", stdin);
   // freopen("out", "w", stdout);

  //  cin >> t;
    for(int i = 1; i <= t; i++) 
    {
        //cout << "Case #" << i << ": ";
        Solve();
    }
    auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n"; 
    return 0;
}

• Subtask 1: 29 / 29
• Subtask 2: 37 / 37
• Subtask 3: 34 / 34