Submission #646100

#	Time	Username	Problem	Language	Result	Execution time	Memory
646100		dozer	Nautilus (BOI19_nautilus)	C++14	66 / 100	26 ms	1876 KiB

nautilus

#include <bits/stdc++.h>
using namespace std;
#define fileio() freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout)
#define fastio() cin.tie(0), ios_base::sync_with_stdio(0)
#define sp " "
#define endl "\n"
#define pb push_back
#define pii pair<int, int>
#define st first
#define nd second
#define N 105

int arr[N][N], s[N], done[N][N];

int32_t main()
{
	fastio();

	pii dir[] = {{-1, 0}, {0, 1}, {1, 0}, {0, -1}};
	map<char, int> val;
	val['N'] = 0, val['E'] = 1, val['S'] = 2, val['W'] = 3, val['?'] = 4;
	int r, c, m;
	cin>>r>>c>>m;
	vector<pii> curr;
	for (int i = 1; i <= r; i++)
	{
		for (int j = 1; j <= c; j++)
		{
			char tmp;
			cin>>tmp;
			if (tmp == '.') arr[i][j] = 1, curr.pb({i, j});
		}
	}

	for (int i = 1; i <= m; i++)
	{
		char tmp;
		cin>>tmp;
		s[i] = val[tmp];
	}

	for (int i = 1; i <= m; i++)
	{
		//cout<<curr.size()<<endl;
		vector<pii> tmp;
		for (auto j : curr)
		{
			int x = j.st, y = j.nd;
			int k = s[i];
			if (k == 4)
			{
				for (auto l : dir)
				{
					int a = x + l.st, b = y + l.nd;
					if (arr[a][b] == 1 && done[a][b] < i + 1)
					{
						done[a][b] = i + 1;
						tmp.pb({a, b});
					}
				}
			}
			else
			{
				pii l = dir[k];
				int a = x + l.st, b = y + l.nd;
				if (arr[a][b] == 1 && done[a][b] < i + 1)
				{
					done[a][b] = i + 1;
					tmp.pb({a, b});
				}
			}
		}
		curr = tmp;
	}

	cout<<curr.size()<<endl;

	cerr<<"time taken : "<<(float)clock() / CLOCKS_PER_SEC<<"seconds\n";
}

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