Submission #807404

#	Time	Username	Problem	Language	Result	Execution time	Memory
807404		MODDI	Nautilus (BOI19_nautilus)	C++14	66 / 100	1085 ms	3284 KiB

nautilus

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
using namespace std;
int r, c, n;
string str;
int mat[501][501];
int dp[2][501][501];
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cin>>r>>c>>n;
	memset(dp, 0, sizeof dp);
	memset(mat, 0, sizeof mat);
	for(int i = 0; i < r; i++){
		string s;
		cin>>s;
		for(int j = 0; j < c; j++){
			if(s[j] == '.'){
				mat[i][j] = 1;
				dp[0][i][j] = 1;
			}
		}
	}
	cin>>str;
	for(int step = 1; step <= n; step++){
		int sega = step & 1, pret = (step-1) & 1;
		for(int i = 0; i < r; i++){
			for(int j = 0; j < c; j++){
				dp[sega][i][j] = 0;
			}
		}
		for(int i = 0; i < r; i++){
			for(int j = 0; j < c; j++){
				if(mat[i][j] == 1){
					if((str[step-1] == 'E' || str[step-1] == '?') && dp[pret][i][j-1] == 1 && j > 0)	
						dp[sega][i][j] = 1;
					if((str[step-1] == 'W' || str[step-1] == '?') && dp[pret][i][j+1] == 1 && j + 1 < c)
						dp[sega][i][j] = 1;
					if((str[step-1] == 'N' || str[step-1] == '?') && i < r-1 && dp[pret][i+1][j] == 1)
						dp[sega][i][j] = 1;
					if((str[step-1]=='S' || str[step-1] == '?') && i > 0 && dp[pret][i-1][j]==1)
						dp[sega][i][j] = 1;
				}
				else	continue;
			}
		}
	}
	long long ans = 0;
	int sega = n & 1;
	for(int i = 0; i < r; i++){
		for(int j = 0; j < c;j ++){
			ans += dp[sega][i][j];
		}
	}
	cout<<ans<<"\n";
	return 0;
}

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