Submission #925610

#	Time	Username	Problem	Language	Result	Execution time	Memory
925610		vjudge1	Nautilus (BOI19_nautilus)	C++17	66 / 100	10 ms	3424 KiB

nautilus

#pragma GCC optimize("O3", "unroll-loops") // "Ofast" 	
#pragma GCC target("avx2", "bmi", "bmi2", "lzcnt", "popcnt") 

#include <bits/stdc++.h>

//#define int long long
#define vt vector
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define f first
#define s second
#define dbg(x) cerr << #x << " = " << x << '\n'
#define bit(x, i) ((x) >> (i) & 1)

using namespace std;
using ll = long long;
using ld = long double;
using pii = pair<int, int>;

const int N = 1e6 + 5, mod = 1e9 + 7;
const ll inf = 1e18 + 7;
const ld eps = 1e-6;

ll add (ll a, ll b) {
	a += b;
	if (a < 0) a += mod;
	if (a >= mod) a -= mod;
	return a;
}

ll mul (ll a, ll b) {
	a *= b;
	if (a >= mod) a %= mod;
	return a;
}

int n, m, M;
string s;
bool dp[105][105][105];

bool in (int x, int y) {
	return (x >= 1 && x <= n && y >= 1 && y <= m);
}

void solve () {
	cin >> n >> m >> M;
	char a[n + 1][m + 1];
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= m; j++) cin >> a[i][j], dp[i][j][0] = (a[i][j] != '#');
	}           
	cin >> s;
	s = ' ' + s;
	for (int k = 1; k <= M; k++) { 
		for (int i = 1; i <= n; i++) {
			for (int j = 1; j <= m; j++) {
				if (a[i][j] == '#') dp[i][j][k] = 0;
				else {
					if (s[k] == 'N' && in(i + 1, j)) dp[i][j][k] |= dp[i + 1][j][k - 1];
					if (s[k] == 'S' && in(i - 1, j)) dp[i][j][k] |= dp[i - 1][j][k - 1];
					if (s[k] == 'E' && in(i, j - 1)) dp[i][j][k] |= dp[i][j - 1][k - 1];
					if (s[k] == 'W' && in(i, j + 1)) dp[i][j][k] |= dp[i][j + 1][k - 1];
					if (s[k] == '?') {
						dp[i][j][k] |= ((in(i, j + 1) ? dp[i][j + 1][k - 1] : 0) | 
						(in(i, j - 1) ? dp[i][j - 1][k - 1] : 0) | 
						(in(i - 1, j) ? dp[i - 1][j][k - 1] : 0) | 
						(in(i + 1, j) ? dp[i + 1][j][k - 1] : 0));
					}
				}
			}
    	}
    }
    int ans = 0;
    for (int i = 1; i <= n; i++) {
    	for (int j = 1; j <= m; j++) {
    		if (dp[i][j][M]) ans++;
    	}
    }
    cout << ans;
	cout << '\n';
}

bool testcases = 0;

signed main() {
#ifdef AMIR
	freopen(".in", "r", stdin);
	freopen(".out", "w", stdout);
#endif
	cin.tie(0) -> sync_with_stdio(0);
	int test = 1;
	if (testcases) cin >> test;
	for (int cs = 1; cs <= test; cs++) {
		solve();
	}
}

• Subtask 1: 29 / 29
• Subtask 2: 37 / 37
• Subtask 3: 0 / 34