Submission #560433

#	Time	Username	Problem	Language	Result	Execution time	Memory
560433		amunduzbaev	Cultivation (JOI17_cultivation)	C++17	0 / 100	2 ms	444 KiB

cultivation

#include "bits/stdc++.h"
using namespace std;
 
#define ar array
#define int long long
 
signed main(){
	ios::sync_with_stdio(0); cin.tie(0);
	
	int R, C; cin>>R>>C;
	int n; cin>>n;
	vector<int> x(n), y(n);
	for(int i=0;i<n;i++){
		cin>>x[i]>>y[i];
	}
	
	int mn_pos = -1;
	{
		auto check = [&](int m){
			vector<ar<int, 2>> s(n);
			for(int i=0;i<n;i++) s[i] = {x[i], x[i] + m - 1};
			sort(s.begin(), s.end());
			int l = -1, r = -1, mx = 0;
			for(auto x : s){
				if(r + 1 < x[0]){
					mx = max(mx, r - l + 1);
					l = x[0], r = x[1];
				} else {
					r = max(r, x[1]);
				}
			} mx = max(mx, r - l + 1);
			return (mx >= R);
		};
		
		int l = 1, r = R;
		while(l < r){
			int m = (l + r) >> 1;
			if(check(m)) r = m;
			else l = m + 1;
		}
		
		mn_pos = l - 1;
	}
	
	vector<int> tot;
	tot.push_back(mn_pos);
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			if(abs(x[i] - x[j]) - 1 >= mn_pos) tot.push_back(abs(x[i] - x[j]) - 1);
		}
	}
	
	sort(tot.begin(), tot.end());
	tot.erase(unique(tot.begin(), tot.end()), tot.end());
	int res = R + C - 2;
	auto check = [&](int a, int add){
		vector<ar<int, 2>> s;
		for(int i=0;i<n;i++){
			s.push_back({x[i], y[i]});
			s.push_back({x[i] + a + 1, -y[i]});
		}
		
		multiset<int> ss, bet;
		sort(s.begin(), s.end());
		//~ for(auto x : s) cout<<x[0]<<" "<<x[1]<<endl;
		//~ cout<<endl;
		int m = s.size();
		vector<ar<int, 5>> tot;
		
		//~ cout<<"here"<<endl;
		for(int i=0;i<m;){
			int j = i;
			while(j<m && s[j][0] == s[i][0]){
				if(s[j][1] > 0){
					auto rx = ss.lower_bound(s[j][1]);
					auto lx = rx;
					if(lx != ss.begin() && rx != ss.end()){
						lx--;
						bet.erase(bet.find(*rx - *lx - 1));
						lx++;
					}
					
					if(rx != ss.end()){
						bet.insert(*rx - s[j][1] - 1);
					} if(lx != ss.begin()){
						lx--;
						bet.insert(s[j][1] - *lx - 1);
						lx++;
					}
					
					ss.insert(s[j][1]);
				} else {
					s[j][1] *= -1;
					ss.erase(ss.find(s[j][1]));
					auto rx = ss.lower_bound(s[j][1]);
					auto lx = rx;
					if(rx != ss.end()){
						bet.erase(bet.find(*rx - s[j][1] - 1));
					} if(lx != ss.begin()){ lx--;
						bet.erase(bet.find(s[j][1] - *lx - 1));
						lx++;
					}
					if(lx != ss.begin() && rx != ss.end()){
						lx--;
						bet.insert(*rx - *lx - 1);
						lx++;
					}
				}
				
				j++;
			}
			int t = 0;
			if(j < m){
				if((s[i][1] > 0) && (s[j][1] < 0)) t = 1;
				if((s[i][1] < 0) && (s[j][1] > 0)) t = -1;
			}
			int left = 0, right = 0, l_r = 0;
			if(!ss.empty()) left = *ss.begin() - 1;
			if(!ss.empty()) right = C - *--ss.end();
			if(!bet.empty()) l_r = *--bet.end();
			//~ for(auto x : ss) cout<<x<<" ";
			//~ cout<<endl;
			//~ for(auto x : bet) cout<<x<<" ";
			//~ cout<<endl;
			//~ cout<<s[i][0]<<" "<<left<<" "<<right<<" "<<l_r<<endl;
			tot.push_back({s[i][0], left, right, l_r, t});
			
			i = j;
		}
		
		//~ for(auto x : tot){
			//~ cout<<x[0]<<" "<<x[1]<<" "<<x[2]<<" "<<x[3]<<" "<<x[4]<<"\n";
		//~ }
		
		//~ int r = 0, mn = C; 
		m = tot.size();
		for(int i=0;i<m;i++){
			int A = 0, B = 0, C = 0, cc = 0;
			for(int j=i+1;j<m;j++){
				A = max(A, tot[j-1][1]);
				B = max(B, tot[j-1][2]);
				C = max(C, tot[j-1][3]);
				cc += tot[j-1][4];
				if(tot[j][0] - tot[i][0] >= R){
					res = min(res, a + max(A + B, C));
				} else if(cc * add >= R - (tot[j][0] - tot[i][0])){
					//~ cout<<a<<" "<<max(A + B, C)<<" "<<(R - (tot[j][0] - tot[i][0]) + cc - 1) / cc<<"\n";
					res = min(res, a + max(A + B, C) + (R - (tot[j][0] - tot[i][0]) + cc - 1) / cc);
				}
				
				assert(cc < 2);
			}
		}
		
		//~ multiset<int> A, B, C;
		//~ for(int l=0;l<m;l++){
			//~ while(r<m && tot[r][0] - tot[l][0] < R){
				//~ A.insert(tot[r][1]);
				//~ B.insert(tot[r][2]);
				//~ C.insert(tot[r][3]);
				//~ r++;
			//~ } if(r == m) break;
			//~ mn = min(mn, max(*--A.end() + *--B.end(), *--C.end()));
			//~ A.erase(A.find(tot[l][1]));
			//~ B.erase(B.find(tot[l][2]));
			//~ C.erase(C.find(tot[l][3]));
		//~ }
		
		//~ res = min(res, a + mn);
	};
	
	//~ cout<<"here"<<endl;
	for(int i=0;i<(int)tot.size();i++){
		check(tot[i], (i+1 < (int)tot.size() ? tot[i+1] - tot[i] - 1 : R));
	}
	cout<<res<<"\n";
}
 

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