Submission #973935

#	Time	Username	Problem	Language	Result	Execution time	Memory
973935		andrewp	Mobile (BOI12_mobile)	C++14	50 / 100	35 ms	5560 KiB

mobile

//Dedicated to my love,ivaziva
#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define dbg(x) cerr<<#x<<": "<<x<<endl;
#define pb push_back
#define fi first
#define se second
#define mp make_pair
#define mt make_tuple
#define pii pair<int,int>
#define pll pair<ll,ll>
#define ldb double
const ll inf=(ll)1e18+5;
const int mod=1e9+7;
const int K=512;
const int L=30;
const int N=1e5+1;
ll n,l;
pll a[N];
int main()
{
    scanf("%lld%lld",&n,&l);
	for(int i=0;i<n;i++) scanf("%lld%lld",&a[i].fi,&a[i].se);
	ldb bot=1,top=(ldb)1.5e9;
	while(top-bot>1e-3)
    {
		ldb mid=(bot+top)/2.0;
		ldb calc=0;
		for(int i=0;i<n;i++)
		{
			ldb razl=sqrt(mid*mid-a[i].se*a[i].se);
			ldb x=a[i].fi-razl;
			ldb y=a[i].fi+razl;
			if(x<=calc)
            {
                calc=max(calc,y);
            }
		}
		if(calc>=l) top=mid;
		else bot=mid;
	}
	cout<<fixed<<setprecision(4)<<bot;
    return 0;
}

Compilation message (stderr)

mobile.cpp: In function 'int main()':
mobile.cpp:24:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 |     scanf("%lld%lld",&n,&l);
      |     ~~~~~^~~~~~~~~~~~~~~~~~
mobile.cpp:25:28: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |  for(int i=0;i<n;i++) scanf("%lld%lld",&a[i].fi,&a[i].se);
      |                       ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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