Submission #1071181

#	Time	Username	Problem	Language	Result	Execution time	Memory
1071181		sleepntsheep	Cultivation (JOI17_cultivation)	C++17	5 / 100	281 ms	424 KiB

cultivation

#pragma GCC optimize("O3,unroll-loops")
#include<cstring>
#include <cstdio>

#include <algorithm>
using namespace std;

int C,z=1e9,R, n, x[300], y[300], c[41][41];

int Check(int l, int u, int r, int d) {
	memset(c,0,sizeof c);
	for (int i = 0; i < n; ++i) {
		++c[max(0, x[i]-u)][max(0, y[i]-l)];
		--c[max(0, x[i]-u)][min(40,y[i]+r+1)];
		--c[min(40,x[i]+d+1)][max(0, y[i]-l)];
		++c[min(40,x[i]+d+1)][min(40,y[i]+r+1)];
	}
	for(int i=1;i<R;++i)c[i][0]+=c[i-1][0];
	for(int j=1;j<C;++j)c[0][j]+=c[0][j-1];
	for(int i=1;i<R;++i)for(int j=1;j<C;++j)c[i][j]+=c[i-1][j]+c[i][j-1]-c[i-1][j-1];
	for(int i=0;i<R;++i)for(int j=0;j<C;++j)if(!c[i][j])return 0;
	return 1;
}

int main() {
	scanf("%d%d%d", &R, &C, &n);
	for (int i = 0; i < n; ++i) scanf("%d%d", x + i, y + i), --x[i], --y[i];

	for(int l=0;l<=40;++l)for(int r=0;r<=40-l;++r){
		for(int u=0;u<=40;++u){
			int lb=-1,ub=41;
			while(ub-lb>1){
				int md=lb+(ub-lb)/2;
				if(Check(l,u,r,md))ub=md,z=min(z,l+u+r+md);
				else lb=md;
			}
		}
	}
	printf("%d",z);
}

Compilation message (stderr)

cultivation.cpp: In function 'int main()':
cultivation.cpp:26:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |  scanf("%d%d%d", &R, &C, &n);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
cultivation.cpp:27:35: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |  for (int i = 0; i < n; ++i) scanf("%d%d", x + i, y + i), --x[i], --y[i];
      |                              ~~~~~^~~~~~~~~~~~~~~~~~~~~~

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