Submission #126044

#	Time	Username	Problem	Language	Result	Execution time	Memory
126044		streifi	Orchard (NOI14_orchard)	C++14	17 / 25	194 ms	16800 KiB

orchard

#include <iostream>
#include <vector>
using namespace std;

const int INF = 0x3f3f3f3f;

signed main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	int N, M;
	cin >> N >> M;
	
	vector<vector<int>> v(N, vector<int>(M)), cum(N+1, vector<int>(M+1, 0));
	for (int n = 0; n < N; ++n) {
		for (int m = 0; m < M; ++m) {
			cin >> v[n][m];
			if (v[n][m] == 0) v[n][m] = -1;
			cum[n+1][m+1] = cum[n+1][m]+cum[n][m+1]-cum[n][m]+v[n][m];
			//cout << cum[m+1] << endl; 
		}
	}
	
	/*for (int n = 1; n <= N; ++n) {
		for (int m = 1; m <= M; ++m) {
			cout << cum[n][m] << " ";
		}
		cout << endl;
	}*/
	
	int best = INF;
	for (int i = 0; i < N; ++i) {
		for (int j = i; j < N; ++j) {
			int mxpos = M-1;
			for (int m = M-1; m >= 0; --m) {
				if (cum[j+1][m+1] > cum[j+1][mxpos+1]) mxpos = m;
				int cntin = (j-i+1)*(mxpos-m+1);
				int cntout = N*M-cntin;
				int out = cum[N][M]-cum[j+1][mxpos+1]+cum[j+1][m]+cum[i][mxpos+1]-cum[i][m];
				int in = cum[N][M]-out;//(cum[j+1][mxpos+1]-cum[j+1][m]-cum[i][mxpos+1]-cum[i][m]);
				
				//cout << cntin << " " << in << " " << cntout << " " << out << endl;
				best = min(best, cntin - in + cntout + out);
				/*if (i == 1 && j == 3 && m == 1 && mxpos == 5) {
					cout << i << " " << m << " " << j << " " << mxpos << endl;
					cout << cntin << " " << in << " " << cntout << " " << out << endl;
				}*/
			}
		}
	}
	cout << best/2 << endl;
}

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 5 / 5
• Subtask 4: 0 / 3
• Subtask 5: 4 / 4
• Subtask 6: 0 / 5