Submission #42892

#	Time	Username	Problem	Language	Result	Execution time	Memory
42892		almasalmas	Cultivation (JOI17_cultivation)	C++14	0 / 100	2079 ms	262144 KiB

cultivation

#include <bits/stdc++.h>

using namespace std;

vector <int> nw;
vector <vector <int> > a;
queue <vector <vector <int> > > q;

int main () {
	ios_base::sync_with_stdio (0);
	cin.tie (0), cout.tie (0);
	int n, m;
	cin >> n >> m;
	nw.push_back (0);
	int t;
	cin >> t;          
	for (int i = 0;i <= n;i ++) {
		a.push_back (nw);
	}
	for (int i = 0;i <= n;i ++) {
		for (int j = 1;j <= m;j ++) {
			a[i].push_back (0);
		}
	}
	for (int i = 1;i <= t;i ++) {
		int x, y;
		cin >> x >> y;
		a[x][y] = 1;
	}
	q.push (a);
	while (!q.empty ()) {
		vector <vector <int> > cur = q.front ();
		bool ok = 0;
		for (int i = 1;i <= n;i ++) {
			for (int j = 1;j <= m;j ++) {
				if (cur[i][j] == 0) ok = 1;
			}
		}
		q.pop ();
		if (!ok) {  
			int mx = 0;
			for (int i = 0;i <= n;i ++) {
				for (int j = 0;j <= m;j ++) {
					mx = max (mx, cur[i][j] - 1);
				//	cout << cur[i][j] - 1 << ' ' ;
				}
				//cout << endl;
			}
			cout << mx;
			return 0;
		}
		vector <vector <int> > nw = cur;
		for (int i = 1;i < n;i ++) {
			for (int j = 1;j <= m;j ++) {
				if (cur[i][j] == 0 && cur[i + 1][j]) {
					nw[i][j] = cur[i + 1][j] + 1;
				}
			}
		}
		q.push (nw);
		nw = cur;
		for (int i = 2;i <= n;i ++) {
			for (int j = 1;j <= m;j ++) {
				if (cur[i][j] == 0 && cur[i - 1][j]) {
					nw[i][j] = cur[i - 1][j] + 1;
				}
			}
		}
		q.push (nw);
		nw = cur;
		for (int i = 1;i <= n;i ++) {
			for (int j = 1;j < m;j ++) {
				if (cur[i][j] == 0 && cur[i][j + 1]) {
					nw[i][j] = cur[i][j + 1] + 1;
				}
			}
		}
		q.push (nw);
		nw = cur;
		for (int i = 1;i <= n;i ++) {
			for (int j = 2;j <= m;j ++) {
				if (cur[i][j] == 0 && cur[i][j - 1]) {
					nw[i][j] = cur[i][j - 1] + 1;
				}
			}
		}
		q.push (nw);
		nw = cur;
	}
	return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 20
• Subtask 6: 0 / 20