Submission #672198

#	Time	Username	Problem	Language	Result	Execution time	Memory
672198		amunduzbaev	Cultivation (JOI17_cultivation)	C++17	45 / 100	379 ms	2512 KiB

cultivation

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

#define ar array
typedef long long ll;
#define int ll

signed main(){
	ios::sync_with_stdio(0); cin.tie(0);
	
	int n, m; cin >> n >> m;
	int sz; cin >> sz;
	vector<int> x(sz), y(sz), t;
	for(int i=0;i<sz;i++){
		cin >> x[i] >> y[i];
	} 
	
	t = x;
	sort(t.begin(), t.end());
	t.erase(unique(t.begin(), t.end()), t.end());
	vector<int> used(t.size());
	
	vector<int> id(sz);
	for(int i=0;i<sz;i++){
		id[i] = lower_bound(t.begin(), t.end(), x[i]) - t.begin() + 1;
	}
	
	int res = 2 * (n + m);
	set<int> don;
	auto check = [&](int d){
		if(don.count(d)) return;
		don.insert(d);
		vector<ar<int, 2>> tot;
		for(int i=0;i<sz;i++){
			//~ cout<<max(1LL, y[i] - w)<<" "<<min(y[i] + e, m)<<"\n";
			tot.push_back({y[i], id[i]});
			tot.push_back({y[i] + d + 1, -id[i]});
		}
		sort(tot.begin(), tot.end());
		vector<int> v, is;
		vector<ar<int, 3>> Mn;
		for(int i=0;i<(int)tot.size();){
			int j = i;
			while(j < (int)tot.size() && tot[j][0] == tot[i][0]){
				if(tot[j][1] > 0) used[tot[j][1] - 1]++;
				else used[-tot[j][1] - 1]--;
				j++;
			}
			
			//~ cout<<tot[i][0]<<" : ";
			int mnl = 0, mn = 0;
			int last = -1;
			for(int i=0;i<(int)t.size();i++){
				if(!used[i]) continue;
				if(~last) mn = max(mn, t[i] - t[last] - 1);
				else mnl = t[i] - 1;
				last = i;
			}
			v.push_back(tot[i][0]);
			if(last == -1){
				Mn.push_back({0, 0, 0});
				is.push_back(1);
			} else {
				Mn.push_back({mnl, n - t[last], mn});
				is.push_back(0);
			}
			
			i = j;
		}
		
		for(int i=0;i + 1 < (int)v.size();i++){
			int mnl = 0, mnr = 0, mn = 0;
			for(int j=i;j + 1 < (int)v.size();j++){
				if(is[j]) break;
				mnl = max(mnl, Mn[j][0]);
				mnr = max(mnr, Mn[j][1]);
				mn = max(mn, Mn[j][2]);
				if(v[j + 1] - v[i] >= m){
					res = min(res, d + max(mnl + mnr, mn));
				}
			}
		}
	};
	
	vector<int> tmp;
	
	for(int i=0;i<sz;i++){
		for(int j=0;j<sz;j++){
			//~ check(y[i] - 1 + m - y[j]);
			tmp.push_back(y[i] - 1 + m - y[j]);
		}
		
		for(int k=0;k<sz;k++){
			if(y[i] >= y[k]) continue;
			//~ check(y[k] - y[i] - 1);
			tmp.push_back(y[k] - y[i] - 1);
		}
	}
	
	sort(tmp.begin(), tmp.end());
	tmp.erase(unique(tmp.begin(), tmp.end()), tmp.end());
	mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	shuffle(tmp.begin(), tmp.end(), rng);
	tmp.resize(min((int)tmp.size(), 1000ll));
	for(auto x : tmp) check(x);
	
	cout<<res<<"\n";
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 0 / 15
• Subtask 4: 30 / 30
• Subtask 5: 0 / 20
• Subtask 6: 0 / 20