Submission #1141800

#	Time	Username	Problem	Language	Result	Execution time	Memory
1141800		Agageldi	Maxcomp (info1cup18_maxcomp)	C++17	15 / 100	97 ms	328 KiB

maxcomp

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

#define ll long long
#define N 600005
#define pb push_back
#define ff first
#define ss second
#define all(x) x.begin(),x.end()
#define sz(s) (int)s.size()
#define pii pair<int,int>

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

ll n, a[2000][2000], t, m, b[N], answer, tt;
vector <pair<ll,ll>> v, ans;
void solve(int x) {
	if(x == tt + 1) {
		ans.clear();
		for(int i = 1; i <= tt; i++) {
			if(b[i]) ans.pb({v[i - 1].ff,v[i - 1].ss});
		}
		if(sz(ans)) {
			sort(ans.begin(),ans.end());
			ll mn = a[ans[0].ff][ans[0].ss], mx = a[ans[0].ff][ans[0].ss];
			for(int i = 0;i<sz(ans) - 1; i++) {
				if(abs(ans[i + 1].ff - ans[i].ff) + abs(ans[i + 1].ss - ans[i].ss) > 1) return;
				mn = min(a[ans[i].ff][ans[i].ss],mn);
				mx = max(mx,a[ans[i].ff][ans[i].ss]);
				mn = min(a[ans[i+1].ff][ans[i + 1].ss],mn);
				mx = max(mx,a[ans[i+1].ff][ans[i+1].ss]);
			}
			t = sz(ans);
			answer = max(answer,mx - mn - t);
		}
		return;
	}
	b[x] = 0;
	solve(x+1);
	b[x] = 1;
	solve(x+1);
}
int main () {
	ios::sync_with_stdio(0);cin.tie(0);
	cin >> n >> m;
	for(int i = 1;i <= n;i++) {
		for(int j = 1;j <=m;j++) {
			cin >> a[i][j];
			if(n*m <= 20) v.pb({i,j});
		}
	}
	tt = sz(v);
	if(n * m <= 20) {
		solve(1);
		cout << answer << '\n';
		return 0;
	}
	for(int i = 1; i <= m; i++) {
		ll mn = a[1][i], mx = a[1][i];
		for(int j = i + 1; j <= m; j++) {
			mx = max(mx,a[1][j]);
			mn = min(mn,a[1][j]);
			answer = max(answer, mx - mn - (j - i + 1));
		}
	}
	cout << answer << '\n';
}

• Subtask 1: 0 / 15
• Subtask 2: 15 / 15
• Subtask 3: 0 / 30
• Subtask 4: 0 / 40