Submission #259793

#	Time	Username	Problem	Language	Result	Execution time	Memory
259793		minhcool	Cultivation (JOI17_cultivation)	C++17	15 / 100	1492 ms	512 KiB

cultivation

#pragma GCC optimize("Ofast")
#include<bits/stdc++.h>
using namespace std;
 
#define fi first
#define se second
#define pb push_back
#define ins insert
#define er erase
 
typedef pair<int, int> ii;
typedef pair<ii, int> iii;
typedef pair<ii, ii> iiii;
 
int n, r, c, s[305], e[305], pref[45][45], ans = 10005;
 
bool ck(int up, int left, int down, int right){
	for(int i = 1; i <= r; ++i){
		for(int j = 1; j <= c; ++j) pref[i][j] = 0;
	}
	for(int i = 1; i <= n; ++i){
		pref[max(1, s[i] - up)][max(1, e[i] - left)]++;
		pref[min(r, s[i] + down) + 1][max(1, e[i] - left)]--;
		pref[max(1, s[i] - up)][min(c, e[i] + right) + 1]--;
		pref[min(r, s[i] + down) + 1][min(c, e[i] + right) + 1]++;
		//cout << max(1, s[i] - up) << " " << max(1, e[i] - left) << " " << min(r + 1, s[i] + down + 1) << " " << min(c + 1, e[i] + right) << "\n";
	}
	for(int i = 1; i <= r; ++i){
		for(int j = 1; j <= c; ++j) pref[i][j] += pref[i][j - 1];
	}
	for(int i = 1; i <= r; ++i){
		for(int j = 1; j <= c; ++j){
			pref[i][j] += pref[i - 1][j];
			if(!pref[i][j]) return 0;
		}
	}
	return 1;
}
 
void mini(int &a, int b){
	a = ((a < b) ? a : b);
}
 
signed main(){
	//freopen("cultivation.inp", "r", stdin);
	//freopen("cultivation.out", "w", stdout);
	ios_base::sync_with_stdio(0);
	cin >> r >> c >> n;
	for(int i = 1; i <= n; i++) cin >> s[i] >> e[i];
	//cout << ck(0, 1, 2, 2) << "\n";
	for(int i = 0; i < r; i++){
		for(int j = 0; j < c; j++){
			int itr = c - 1, temp = i + j - 1;
			for(int k = 0; k <= r - 1; k++){
				while(itr >= 0 && ck(i, j, k, itr)) --itr;
				++itr;
				++temp;
				//cout << i << " " << j << " " << k << " " << itr << " " << temp + itr << "\n";
				if(ck(i, j, k, itr)) mini(ans, temp + itr);
			}
		}
	}
	cout << ans;
}
 

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