# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
388971 | tostes | Mobile (BOI12_mobile) | C++17 | 679 ms | 35396 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
//#include<iostream>
//#include<vector>
using namespace std;
#define _ << ' ' <<
#define pb push_back
#define all(x) begin(x), end(x)
#define mp make_pair
#define f first
#define s second
#define sz(x) int((x).size())
using ll = long long;
using db = long double;
using pl = pair<ll,ll>;
using pi = pair<int,int>;
vector < pair<double,double> > pt;
int n;
double l;
bool pos(double k){
double sm=0;
for(int i=0; i<n; i++){
if(abs(pt[i].s)>=k) continue;
double sq = sqrt(k*k-pt[i].s*pt[i].s);
if(pt[i].f-sq<=sm) sm=max(sm,pt[i].f+sq);
}
return sm>=l;
}
int main(){
// ios::sync_with_stdio(false);
// cin.tie(0);
//freopen("loan.in", "r", stdin);
//freopen("loan.out", "w", stdout);
scanf("%d %lf", &n, &l);
pt.resize(n);
for(auto &x: pt) scanf("%lf %lf", &x.f, &x.s);
double lo=0, hi=1e10;
while((hi-lo)>0.00001){
double mid=(lo+hi)/2;
if(pos(mid)) hi=mid;
else lo=mid;
}
printf("%.6lf\n", lo);
}
Compilation message (stderr)
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