Submission #908794

#	Time	Username	Problem	Language	Result	Execution time	Memory
908794		OAleksa	The Kingdom of JOIOI (JOI17_joioi)	C++14	0 / 100	2 ms	2512 KiB

joioi

#include <bits/stdc++.h>
//ako ovaj vaso daso misli da me pobedjuje.....
using namespace std;
#define int long long
#define f first
#define s second
const int N = 2010;
int n, m, a[N][N], vis[N][N];
signed main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int tt = 1;
  //cin >> tt;
  while (tt--) {
  	cin >> n >> m;
  	for (int i = 1;i <= n;i++) {
  		for (int j = 1;j <= m;j++) {
  			cin >> a[i][j];
  		}
  	}
  	int l = 0, r = 1e9, ans = -1;
  	auto reset = [&]() {
  		for (int i = 1;i <= n;i++) {
  			for (int j = 1;j <= m;j++)
  				vis[i][j] = 0;
  		}
  	};
  	auto other = [&]() {
  		int mn = 1e9, mx = 0;
  		for (int i = 1;i <= n;i++) {
  			for (int j = 1;j <= m;j++) {
  				if (vis[i][j])
  					continue;
  				mx = max(mx, a[i][j]);
  				mn = min(mn, a[i][j]);
  			}
  		}
  		return mx - mn;
  	};
  	auto check = [&](int mid) {
  		int mn = 1e9, mx = 0;
  		reset();
  		for (int i = 0;i <= m;i++)
  			vis[0][i] = 1;
  		for (int i = 1;i <= n;i++) {
  			for (int j = 1;j <= m;j++) {
  				int tmx = max(mx, a[i][j]);
  				int tmn = min(mn, a[i][j]);
  				if (tmx - tmn <= mid && vis[i - 1][j]) {
  					mx = max(mx, a[i][j]);
  					mn = min(mn, a[i][j]);
  					vis[i][j] = 1;
  				}
  				else
  					break;
  			}
  		}
  		if (other() <= mid)
  			return true;
  		mn = 1e9, mx = 0;
  		reset();
  		for (int i = 0;i <= m;i++)
  			vis[0][i] = 1;
  		for (int i = 1;i <= n;i++) {
  			for (int j = m;j >= 1;j--) {
  				int tmx = max(mx, a[i][j]);
  				int tmn = min(mn, a[i][j]);
  				if (tmx - tmn <= mid && vis[i - 1][j]) {
  					mx = max(mx, a[i][j]);
  					mn = min(mn, a[i][j]);
  					vis[i][j] = 1;
  				}
  				else
  					break;
  			}
  		}
  		if (other() <= mid)
  			return true;
  		mn = 1e9, mx = 0;
  		reset();
  		for (int i = 0;i <= m;i++)
  			vis[n + 1][i] = 1;
  		for (int i = n;i >= 1;i--) {
  			for (int j = 1;j <= m;j++) {
  				int tmx = max(mx, a[i][j]);
  				int tmn = min(mn, a[i][j]);
  				if (tmx - tmn <= mid && vis[i + 1][j]) {
  					mx = max(mx, a[i][j]);
  					mn = min(mn, a[i][j]);
  					vis[i][j] = 1;
  				}
  				else
  					break;
  			}
  		}
  		if (other() <= mid)
  			return true;
  		mn = 1e9, mx = 0;
  		reset();
  		for (int i = 0;i <= m;i++)
  			vis[n + 1][i] = 1;
  		for (int i = n;i >= 1;i--) {
  			for (int j = m;j >= 1;j--) {
  				int tmx = max(mx, a[i][j]);
  				int tmn = min(mn, a[i][j]);
  				if (tmx - tmn <= mid && vis[i + 1][j]) {
  					mx = max(mx, a[i][j]);
  					mn = min(mn, a[i][j]);
  					vis[i][j] = 1;
  				}
  				else
  					break;
  			}
  		}
  		if (other() <= mid)
  			return true;
  		return false;
  	};
  	while (l <= r) {
  		int mid = (l + r) / 2;
  		if (check(mid)) {
  			ans = mid;
  			r = mid - 1;
  		}
  		else
  			l = mid + 1;
  	}
  	cout << ans << '\n';
	}
  return 0;
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 45
• Subtask 3: 0 / 40