Submission #205693

#	Time	Username	Problem	Language	Result	Execution time	Memory
205693		ZwariowanyMarcin	Orchard (NOI14_orchard)	C++14	25 / 25	451 ms	23928 KiB

orchard

#include <bits/stdc++.h>
#define LL long long
#define LD long double
#define pb push_back
#define mp make_pair
#define ss(x) (int) x.size()
#define fi first
#define se second
#define cat(x) cerr << #x << " = " << x << endl
#define rep2(i, j, n) for (LL i = j; i <= n; ++i)
#define rep(i, j, n) for (int i = j; i <= n; ++i)
#define per(i, j, n) for (int i = n; j <= i; --i)
#define boost cin.tie(0);ios_base::sync_with_stdio(0);
#define vi vector <int>

using namespace std;

const int nax = 1e6 + 111;

int n, m;
LL f[nax];
LL best = 1e18;
int ones;
vector <vector <int>> a, g;

int main() {	
	scanf ("%d%d", &n, &m);
	
	a.resize(n + 5);
	g.resize(n + 5);
	
	rep(i, 0, n) a[i].resize(m + 5, 0);
	rep(i, 0, n) g[i].resize(m + 5, 0);
	
	rep(i, 1, n) rep(j, 1, m) {
		scanf ("%d", &a[i][j]);
		g[i][j] = (a[i][j] == 1) + g[i - 1][j];
		ones += (a[i][j] == 1);
	}
	
	rep(i, 1, n)
		rep(j, i, n) {
			rep(x, 1, m) f[x] = g[j][x] - g[i - 1][x];
			LL opt = 1e18;
			int h = j - i + 1;
			rep(x, 1, m) f[x] += f[x - 1];
			
			rep(x, 1, m) {
				opt = min(opt, 2 * f[x - 1] - h * (x - 1));
				best = min(best, ones + (h * x) - 2 * f[x] + opt);
			}
			
		}
	printf ("%lld\n", best);
			
	
	return 0;
}

Compilation message (stderr)

orchard.cpp: In function 'int main()':
orchard.cpp:27:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf ("%d%d", &n, &m);
  ~~~~~~^~~~~~~~~~~~~~~~
orchard.cpp:36:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf ("%d", &a[i][j]);
   ~~~~~~^~~~~~~~~~~~~~~~

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