제출 #1084084

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1084084		vjudge1	Bulldozer (JOI17_bulldozer)	C++17	5 / 100	121 ms	468 KiB

bulldozer

#include <bits/stdc++.h>
using namespace std;
#define ld long double
long double dis(ld a,ld b,ld c,ld x,ld y)
{
	return (abs(a*x+b*y+c))/sqrt(a*a+b*b);
}
struct node
{
	long long x,y,w;
}p[2009];
int n;
const ld pi=acos(-1); 
ld rad(ld x)
{
	return x*pi/180;
}
struct pos
{
	bool is;
	ld x;
	long long w;
};
#define first x
#define second y
struct cmp
{
	bool operator() (pos a,pos b)
	{
		if(a.is!=b.is)return a.is<b.is;
		if(a.is==0)return a.x>b.x;
		return a.x<b.x;
	}
};
const ld E=1e-8;
long long f[2009];
int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin>>n;
	for(int i=1;i<=n;i++)cin>>p[i].x>>p[i].y>>p[i].w;
	long long kq=0;
	for(ld j=-1000;j<=1000;j+=0.1)
	{
		vector<pos>t;
		ld a=j;
		for(int i=1;i<=n;i++)
		{
			if(p[i].y>=a*p[i].x)t.push_back({1,dis(a,-1,0,p[i].x,p[i].y),p[i].w});
			else t.push_back({0,dis(a,-1,0,p[i].x,p[i].y),p[i].w});
		}
		sort(t.begin(),t.end(),cmp());
		int cnt=0;		
		for(int i=1;i<=n;i++)f[i]=0;
		cnt++;
		f[cnt]=t[0].w;
		for(int i=1;i<t.size();i++)
		{
			if(t[i].is==t[i-1].is&&abs(t[i].x-t[i-1].x)<E)f[cnt]+=t[i].w;
			else
			{
				cnt++;
				f[cnt]=t[i].w;
			}
		}
		long long tam=0, pre = 0;
		for(int i=1;i<=cnt;i++)
		{
			tam += f[i];
			kq = max(kq, tam - pre);
			pre = min(pre, tam);
		}
		kq=max(kq,tam);
		// if(kq==21)
		// {
		// 	cout<<a<<'\n';
		// 	for(int i=1;i<=cnt;i++)cout<<f[i]<<'\n';
		// 	for(auto i:t)cout<<i.is<<' '<<i.x<<' '<<i.w<<endl;
		// 	break;
		// }
 
	}
	ld a,b,c;
	mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	for(int i=1;i<=1000;i++)
	{
		int x=rng()%n+1;
		int y=rng()%n+1;
		while(x!=y)y=rng()%n+1;
		vector<pos>t;
		a=1.0*(p[y].second-p[x].second);
		b=-1.0*(p[y].first-p[x].first);
		c=-1.0*p[x].first*(p[y].second-p[x].second)+p[x].second*(p[y].first-p[x].first);
		for(int i=1;i<=n;i++)
		{
			if(p[i].y>=a*p[i].x)t.push_back({1,dis(a,-1,0,p[i].x,p[i].y),p[i].w});
			else t.push_back({0,dis(a,-1,0,p[i].x,p[i].y),p[i].w});
		}
		sort(t.begin(),t.end(),cmp());
		int cnt=0;		
		for(int i=1;i<=n;i++)f[i]=0;
		cnt++;
		f[cnt]=t[0].w;
		for(int i=1;i<t.size();i++)
		{
			if(t[i].is==t[i-1].is&&abs(t[i].x-t[i-1].x)<E)f[cnt]+=t[i].w;
			else
			{
				cnt++;
				f[cnt]=t[i].w;
			}
		}
		long long tam=0, pre = 0;
		for(int i=1;i<=cnt;i++)
		{
			tam += f[i];
			kq = max(kq, tam - pre);
			pre = min(pre, tam);
		}
		kq=max(kq,tam);
	}
	cout<<kq;
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

bulldozer.cpp: In function 'int main()':
bulldozer.cpp:58:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<pos>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |   for(int i=1;i<t.size();i++)
      |               ~^~~~~~~~~
bulldozer.cpp:105:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<pos>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |   for(int i=1;i<t.size();i++)
      |               ~^~~~~~~~~
bulldozer.cpp:84:7: warning: variable 'b' set but not used [-Wunused-but-set-variable]
   84 |  ld a,b,c;
      |       ^
bulldozer.cpp:84:9: warning: variable 'c' set but not used [-Wunused-but-set-variable]
   84 |  ld a,b,c;
      |         ^

• Subtask 1: 5 / 5
• Subtask 2: 0 / 20
• Subtask 3: 0 / 35
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20