# | 제출 시각 | 아이디 | 문제 | 언어 | 결과 | 실행 시간 | 메모리 |
---|---|---|---|---|---|---|---|
374762 | wzy | Mobile (BOI12_mobile) | C++17 | 668 ms | 27628 KiB |
이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
const int N = 1000005;
int n , L;
pair<int,int> v[N];
double f(double mid){
double cur = 0.00;
for(int i = 1 ; i <= n; i ++){
double len = sqrt(mid*mid - 1.00 * (1ll * v[i].second)* (1ll * v[i].second));
if(cur >= (1.00 * v[i].first - len))
cur = max(cur , 1.00*v[i].first + len);
}
return cur >= L;
}
int32_t main(){
scanf("%d%d" , &n , &L);
for(int i = 1; i <= n; i ++){
scanf("%d%d" , &v[i].first , &v[i].second);
}
sort(v + 1 , v + 1 + n);
double l = 0.000 , r = 4e9;
while(r-l > 1e-6){
double mid = l + (r-l)/2;
if(f(mid))
r = mid;
else
l = mid;
}
printf("%.6lF" , l);
}
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