Submission #412458

#	Time	Username	Problem	Language	Result	Execution time	Memory
412458		mbfibat	Nautilus (BOI19_nautilus)	C++17	100 / 100	289 ms	1096 KiB

nautilus

#pragma GCC target("popcnt")

#include <bits/stdc++.h>

using namespace std;

int R, C, M;
string s;

char c[501][501];
bitset<250000> org, cur, E, W;

int id(int i, int j) {
	return i * C + j;
}

int main(int argc, char** argv)
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	 
	cin >> R >> C >> M;
	for (int i = 0; i < R; i++)
		for (int j = 0; j < C; j++) {
			cin >> c[i][j];

			int pos = id(i, j);
			if (c[i][j] == '.') {
				org.set(pos);
				cur.set(pos);
			}	
			if (j != C - 1) W.set(pos);
			if (j != 0) E.set(pos);
		}

	cin >> s;
	for (int i = 0; i < M; i++) {
		if (s[i] == 'N')
			cur = (cur >> C);	
		else if (s[i] == 'S') 	
			cur = (cur << C);
		else if (s[i] == 'W')
			cur = (cur >> 1) & W;
		else if (s[i] == 'E')
			cur = (cur << 1) & E;
		else
			cur = ((cur >> C) | (cur << C) | ((cur >> 1) & W) | ((cur << 1) & E));	
		cur &= org;
	}
	cout << cur.count();
}

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