Submission #1220900

#	Time	Username	Problem	Language	Result	Execution time	Memory
1220900		sam230609	Mobile (BOI12_mobile)	C++20	100 / 100	267 ms	16092 KiB

mobile

#include <bits/stdc++.h>
#define x first
#define y second
using namespace std;
typedef long long ll;
pair<ll,ll> p[1000000]; ll n,k; 
int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	cin >>n>>k; double l=1,r=1.5e9;
	for(ll i=0;i<n;i++) cin >>p[i].x>>p[i].y;
	while(r-l>1e-3){
		double mid=(l+r)/2,cur=0;
		for(ll i=0;i<n;i++){
			double d=sqrt(mid*mid-p[i].y*p[i].y);
			double a=p[i].x-d,b=p[i].x+d;
			if(a<=cur) cur=max(cur,b);
		}if(cur>=k) r=mid; else l=mid;
	}cout <<fixed<<setprecision(4)<<l;
}

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 4 / 4
• Subtask 4: 4 / 4
• Subtask 5: 4 / 4
• Subtask 6: 5 / 5
• Subtask 7: 5 / 5
• Subtask 8: 5 / 5
• Subtask 9: 5 / 5
• Subtask 10: 5 / 5
• Subtask 11: 5 / 5
• Subtask 12: 5 / 5
• Subtask 13: 5 / 5
• Subtask 14: 5 / 5
• Subtask 15: 5 / 5
• Subtask 16: 5 / 5
• Subtask 17: 5 / 5
• Subtask 18: 5 / 5
• Subtask 19: 5 / 5
• Subtask 20: 5 / 5
• Subtask 21: 5 / 5