Submission #553980

#	Time	Username	Problem	Language	Result	Execution time	Memory
553980		shmad	Orchard (NOI14_orchard)	C++17	0 / 25	3 ms	340 KiB

orchard

#pragma GCC optimize("O3", "unroll-loops") // "Ofast"
#pragma GCC target("avx2", "bmi", "bmi2", "lzcnt", "popcnt") 

#include <bits/stdc++.h>

#define int long long
#define vt vector
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define ff first
#define ss second
#define dbg(x) cerr << #x << " = " << x << '\n'
#define bit(x, i) (x >> i & 1)

using namespace std;
using ll = long long;
using pii = pair<int, int>;
using vvt = vt< vt<int> >;

const int N = 1e6 + 5, mod = 1e9 + 7, inf = 1e18 + 7, B = 500, LIM = (1ll << 60);
const double eps = 1e-6;

int n, m, p[200][5005], v[5005];

int get (int l, int r) {
	int mn = 0, ans = inf;
	int len = r - l + 1;
	for (int i = 1; i <= m; i++) {
		mn = min(mn, v[i] * 2 - (i * len));
		ans = min(ans, (i * len) - v[i] * 2 + mn);
	}
	return ans;
}

void solve () {
	cin >> n >> m;
	bool a[n + 1][m + 1];
	int cnt = 0;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= m; j++) {
			cin >> a[i][j];
			cnt += a[i][j];
			p[i][j] = p[i - 1][j] + p[i][j - 1] - p[i - 1][j - 1] + a[i][j];
		}
	}
	int ans = inf;
	for (int i = 1; i <= n; i++) {
		for (int j = i; j <= n; j++) {
			for (int k = 1; k <= m; k++) v[k] = p[j][k] - p[i - 1][k];
			ans = min(ans, get(i, j));
		}
	}
	cout << cnt + ans;
	cout << '\n';
}

bool testcases = 0;

signed main() {
#ifndef ONLINE_JUDGE
	freopen(".in", "r", stdin);
	freopen(".out", "w", stdout);
#endif
    cin.tie(0) -> sync_with_stdio(0);
    int test = 1;
    if (testcases) cin >> test;
    for (int cs = 1; cs <= test; cs++) {
        solve();
    }
}

Compilation message (stderr)

orchard.cpp: In function 'int main()':
orchard.cpp:62:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |  freopen(".in", "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~
orchard.cpp:63:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |  freopen(".out", "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

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