Submission #1029558

#	Time	Username	Problem	Language	Result	Execution time	Memory
1029558		vjudge1	Wish (LMIO19_noras)	C++17	0 / 100	1 ms	4592 KiB

noras

// 23 - 12 - 23 

#include<bits/stdc++.h>

using namespace std;

#define read() ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define day() time_t now = time(0);char* x = ctime(&now);cerr<<"Right Now Is : "<<x<<"\n"

#define int long long
#define ii pair<int,int>
#define X first
#define Y second 

const long long MAX = (int)2e5 + 5;
const long long INF = (int)1e9;
const long long MOD = (int)1e9 + 7;

int n,r;
int a[MAX],b[MAX],c[MAX],d[MAX];

signed main(){
	
	read();
	
	cin >> n >> r;
	
	// (x) ^ 2 + y ^ 2 = r ^ 2 
	// a[i] + t * u , b[i] + t * v
	// (a + tu) ^ 2 + (b + tv) ^ 2 = r 
	// t ^ 2 * (u ^ 2 + v ^ 2) + 2t(au + bv) + a ^ 2 + b ^ 2 - r ^ 2 = 0
	vector<ii> sweep;
	
	for(int i = 1;i <= n;i++){
		cin >> a[i] >> b[i] >> c[i] >> d[i];
		
		int u = c[i] - a[i];
		int v = d[i] - b[i];
		
		int _a = u * u + v * v;
		int _b = 2 * (a[i] * u + b[i] * v);
		int _c = a[i] * a[i] + b[i] * b[i] - r * r;
		
		// _aX^2 + _bX + _c = 0
		
		int dental = _b * _b - 4 * _a * _c;
		
		if(dental >= 0){
			long double x_1 = (-_b - sqrt(dental)) / (2 * _a);
			long double x_2 = (-_b + sqrt(dental)) / (2 * _a);
			
			int inside = ceil(min(x_1,x_2));
			int outside = floor(max(x_2,x_1));
			
			if(inside <= outside){
				//cout << i << " " << inside << " " << outside << "\n";
				sweep.push_back({inside,0});
				sweep.push_back({outside,1});
			}
		}
		
	}	
	
	sort(sweep.begin(),sweep.end(),[&](const ii &a,const ii &b){
		return (a.X == b.X) ? (a.Y < b.Y) : (a.X < b.X);
	});
	
	int res = 0;
	int cnt = 0;
	
	for(auto e : sweep){
		cnt += (e.Y == 0 ? 1 : -1);
		if(e.X >= 0)
			res = max(res,cnt);
	}
	
	cout << res;
	
	
	
}

• Subtask 1: 0 / 23
• Subtask 2: 0 / 23
• Subtask 3: 0 / 15
• Subtask 4: 0 / 32
• Subtask 5: 0 / 7