Submission #889831

#	Time	Username	Problem	Language	Result	Execution time	Memory
889831		vjudge1	Nautilus (BOI19_nautilus)	C++17	29 / 100	1039 ms	2652 KiB

nautilus

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include<bits/stdc++.h>
#define ll long long
#define F first
#define S second
#define pb push_back
#define pf push_front
#define ppb pop_back
#define ppf pop_front
#define all(x) x.begin(), x.end()
#define sz(x) x.size()
#define forik(x) ll i = 1; i <= x; i++

// (a mod 1e9) / (b mod 1e9) = a * (b^1e9)

using namespace std;

ll a, b, c, e, t, n, m, k;
char p[2001][2001];
string s;

void rec (ll x, ll y, ll a = 0){
//	cout << a << '\n';
//	cout << x << ' ' << y << ' ' << a << '\n';
	if (p[x][y] == '#'){
		return;
	}
	if (a == k){
		b++;
		return;
	}
	if (s[a] == 'N'){
		rec (x - 1, y, a + 1);
	}
	else if (s[a] == 'S'){
		rec (x + 1, y, a + 1);
	}
	else if (s[a] == 'W'){
		rec (x, y - 1, a + 1);
	}
	else if (s[a] == 'E'){
		rec (x, y + 1, a + 1);
	}
	else{
		rec (x + 1, y, a + 1);
		rec (x, y - 1, a + 1);
		rec (x - 1, y, a + 1);
		rec (x, y + 1, a + 1);
	}
}

signed main (){
	//freopen (".in", "r", stdin);
//	freopen (".out", "w", stdout);
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	cin >> n >> m >> k;
	for (int i = 0; i <= n + 1; i++){
		for (int y = 0; y <= m + 1; y++){
			p[i][y] = '#';
		}
	}
	for (int i = 1; i <= n; i++){
		for (int y = 1; y <= m; y++){
			cin >> p[i][y];
		}
	}
	cin >> s;
	b = 0;
	for (int i = 1; i <= n; i++){
		for (int y = 1; y <= m; y++){
			if (p[i][y] != '#'){
				rec (i, y);
			}
		}
	}
	cout << b;
}

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