Submission #837124

#	Time	Username	Problem	Language	Result	Execution time	Memory
837124		makanhulia	Orchard (NOI14_orchard)	C++17	25 / 25	101 ms	19884 KiB

orchard

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define ull unsigned long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define fi first
#define se second

const int N = 2e5 + 5;

int main() { 
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    int n, m, ans = 0;
    cin >> n >> m;
    vector<vector<int>> a(n + 1, vector<int>(m + 1, 0)), pref(n + 1, vector<int>(m + 1, 0));
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            cin >> a[i][j];
            if (a[i][j] == 1) ans--;
            else a[i][j] = -1;
        }
    }
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) pref[i][j] = pref[i - 1][j] + a[i][j];
    }
    int mx = 0;
    for (int i = 1; i <= n; i++) {
        for (int j = i; j <= n; j++) {
            int sum = 0;
            for (int k = 1; k <= m; k++) {
                sum = max(0, sum + pref[j][k] - pref[i - 1][k]);
                mx = max(mx, sum);
            }
        }
    }
    cout << -1 * (ans + mx) << "\n";
}  

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