Submission #260275

#	Time	Username	Problem	Language	Result	Execution time	Memory
260275		Namnamseo	Nautilus (BOI19_nautilus)	C++17	100 / 100	155 ms	768 KiB

nautilus

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pp;
typedef pair<ll,ll> pll;
void cppio(){ ios_base::sync_with_stdio(0); cin.tie(0); }
#define all(x) (x).begin(),(x).end()
#define pb push_back
#define eb emplace_back
#define x first
#define y second
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = 1; i <= (n); ++i)
#define sz(x) (int)(x).size()
#define XY(p) p.x, p.y

int n, m, k;
char c[5010];

typedef bitset<500> BIT[500];

BIT sc[2], ok;

int main()
{
	cppio(); cin >> n >> m >> k;
	{ static char buf[510]; rep(i, n) {
		cin >> buf;
		rep(j, m) if (buf[j] == '.') ok[i][j] = 1;
	} }

	cin >> c;

	int cur = 0;
	rep(i, n) sc[cur][i] = ok[i];

	rep(ki, k) {
		auto dp = sc[cur];
		switch(c[ki]) {
		case 'E':
			rep(i, n) dp[i] = ((dp[i]<<1)&ok[i]);
		break;
		case 'W':
			rep(i, n) dp[i] = ((dp[i]>>1)&ok[i]);
		break;
		case 'N':
			rep(i, n-1) dp[i] = ((dp[i+1])&ok[i]);
			dp[n-1].reset();
		break;
		case 'S':
			for(int i=n-1; 1<=i; --i)
				dp[i] = ((dp[i-1])&ok[i]);
			dp[0].reset();
		break;
		case '?':
			auto tmp = sc[cur^1];
			rep(i, n) {
				tmp[i] = ((dp[i]<<1) | (dp[i]>>1));
				if (i)
					tmp[i] |= dp[i-1];
				if (i+1 < n)
					tmp[i] |= dp[i+1];
			}

			rep(i, n) tmp[i] &= ok[i];
			cur ^= 1;
		break;
		}
	}

	int ans = 0;
	rep(i, n) ans += sc[cur][i].count();

	cout << ans << endl;
	return 0;
}

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