Submission #691808

#	Time	Username	Problem	Language	Result	Execution time	Memory
691808		phathnv	Orchard (NOI14_orchard)	C++11	25 / 25	164 ms	10100 KiB

orchard

#include <bits/stdc++.h>
using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    vector<vector<int>> a(n, vector<int>(m));
    int num1 = 0;
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < m; ++j) {
            cin >> a[i][j];
            num1 += a[i][j];
        }
    }

    int res = num1;
    vector<int> s(m);
    for (int x1 = 0; x1 < n; ++x1) {
        fill(s.begin(), s.end(), 0);
        for (int x2 = x1; x2 < n; ++x2) {
            int cur = 0, sum = 0;
            for (int i = 0; i < m; ++i) {
                sum += (a[x2][i]? -1 : +1);
                s[i] += sum;
                res = min(res, num1 + s[i] - cur);
                cur = max(cur, s[i]);
            }
        }
    }
    cout << res << '\n';

    return 0;
}

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