Submission #496417

#	Time	Username	Problem	Language	Result	Execution time	Memory
496417		Ierus	Nautilus (BOI19_nautilus)	C++17	66 / 100	403 ms	262148 KiB

nautilus

#include<bits/stdc++.h>
/*
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
*/
using namespace std;
#pragma GCC optimize ("unroll-loops,Ofast,O3")
#pragma GCC target("avx,avx2,fma")
#define F first
#define int short
#define S second
#define sz(x) (int)x.size()
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
#define NFS ios_base::sync_with_stdio(0) , cin.tie(0) , cout.tie(0) ;
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
//#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
typedef long long ll;
const long long inf = 1e18+777;
const int N = 5555;
const bool I = 1;
const vector<pair<int,int>> dxy = {{1,0},{-1,0},{0,1},{0,-1}};
int n, m, k, q[5555];
char a[555][555];
bool vis[555][555];
int32_t res = 0;
bool used[555][555][5555];
bool In(int x, int y){
	return (x <= n && x >= 1 && y <= m && y >= 1);
}
void bfs(int x, int y, int d = 1){
	deque<tuple<int,int,int>> dq;
	dq.pb({x, y, d});
	while(!dq.empty()){
		tie(x, y, d) = dq.front();
		dq.pop_front();
		if(d == k + 1){
			if(!vis[x][y]){
				vis[x][y] = true;
				++res;
			}
			continue;	
		}
		if(q[d] == -1){
			for(auto [f, s] : dxy){
				int x1 = x + f, y1 = y + s;
				if(In(x1, y1) && a[x1][y1] != '#' && !used[x1][y1][d+1]){
					dq.pb({x1, y1, d+1});
					used[x1][y1][d+1] = true;
				}
			}
		}else{
			int x1 = x + dxy[q[d]].F, y1 = y + dxy[q[d]].S;
			if(In(x1, y1) && a[x1][y1] != '#' && !used[x1][y1][d+1]){
				dq.pb({x1, y1, d+1});
				used[x1][y1][d+1] = true;
			}
		}
	}
}
void dfs(int x, int y, int d){
	if(d == k + 1){
		if(!vis[x][y]){
			vis[x][y] = true;
			++res;
		}
		return;
	}
	if(q[d] == -1){
		for(auto [f, s] : dxy){
			int x1 = x + f, y1 = y + s;
			if(In(x1, y1) && a[x1][y1] != '#' && !used[x1][y1][d+1]){
				used[x1][y1][d+1] = true;
				dfs(x1, y1, d+1);
			}
		}
	}else{
		int x1 = x + dxy[q[d]].F, y1 = y + dxy[q[d]].S;
		if(In(x1, y1) && a[x1][y1] != '#' && !used[x1][y1][d+1]){
			used[x1][y1][d+1] = true;
			dfs(x1, y1, d+1);
		}
	}
}
signed main(){NFS;
	cin >> n >> m >> k;
	for(int i = 1; i <= n; ++i){
		for(int j = 1; j <= m; ++j){
			cin >> a[i][j];
		}
	}
	for(int i = 1; i <= k; ++i){
		char r; cin >> r;
		if(r == '?') q[i] = -1;
		if(r == 'N') q[i] = 1;
		if(r == 'S') q[i] = 0;
		if(r == 'E') q[i] = 2;
		if(r == 'W') q[i] = 3;
	}

	for(int i = 1; i <= n; ++i)
		for(int j = 1; j <= m; ++j){
			if(a[i][j] == '.'){
				dfs(i, j, 1);
			}
		}
	cout << res;
};

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