Submission #276746

#	Time	Username	Problem	Language	Result	Execution time	Memory
276746		manh9203	Nautilus (BOI19_nautilus)	C++17	100 / 100	195 ms	1016 KiB

nautilus

#include<bits/stdc++.h>

using namespace std;
using ll = long long;

const int N = 505;

int n, m, k;
char c[N][N];
bitset<N> init[N];
bitset<N> dp[N][2];
string s;

int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	
	cin >> n >> m >> k;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= m; j++) {
			cin >> c[i][j];
			if (c[i][j] == '.') init[i].set(j);
		}
		dp[i][1] = init[i];
	}
	cin >> s;

	for (int i = 1; i <= k; i++) {
		for (int j = 1; j <= n; j++) {
			dp[j][0] = dp[j][1];
			dp[j][1].reset();
		}
		for (int j = 1; j <= n; j++) {
			if (s[i - 1] == 'W') dp[j][1] |= (dp[j][0] >> 1);
			if (s[i - 1] == 'E') dp[j][1] |= (dp[j][0] << 1);
			if (s[i - 1] == 'N') dp[j][1] |= dp[j + 1][0];
			if (s[i - 1] == 'S') dp[j][1] |= dp[j - 1][0];
			if (s[i - 1] == '?') {
				dp[j][1] |= (dp[j][0] >> 1);
				dp[j][1] |= (dp[j][0] << 1);
				dp[j][1] |= dp[j + 1][0];
				dp[j][1] |= dp[j - 1][0];
			}
			dp[j][1] &= init[j];
		}
	}
	
	int ans = 0;
	for (int i = 1; i <= n; i++) ans += dp[i][1].count();
	cout << ans;
}

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