Submission #898467

#	Time	Username	Problem	Language	Result	Execution time	Memory
898467		ivaziva	Mobile (BOI12_mobile)	C++14	0 / 100	482 ms	15964 KiB

mobile

    #include <bits/stdc++.h>
     
    using namespace std;
     
    #define MAXN 1000010
     
    long long n,x;
    long long a1[MAXN];
    long long a2[MAXN];
     
    int main()
    {
        cin>>n>>x;
        long long poz=1;
        cin>>a1[1]>>a2[1];poz++;
        for (long long i=2;i<=n;i++)
        {
            long long xx,yy; cin>>xx>>yy;
            if (a1[poz-1]==xx) continue;
            a1[poz]=xx;a2[poz]=yy;poz++;
        }
        poz--;
        double dist=-LLONG_MAX*1.00;
        double ans=-1.00;
        for (long long i=2;i<=poz;i++)
        {
            double l=a1[i-1];
            double r=a1[i];
            while (r-l>=0.0001)
            {
                double mid=(l+r)/2;
                double dist1=(mid-a1[i-1]*1.00)*(mid-a1[i-1]*1.00)+a2[i-1]*a2[i-1]*1.00;
                double dist2=(mid-a1[i]*1.00)*(mid-a1[i]*1.00)+a2[i]*a2[i]*1.00;
                if (dist1>dist2) r=mid;
                else l=mid;
            }
            double val=(a1[i-1]*1.00-l)*(a1[i-1]*1.00-l)+a2[i-1]*a2[i-1]*1.00;
            if (val>dist){dist=val;ans=l;}
        }
        cout<<fixed<<showpoint<<setprecision(4)<<dist<<endl;
    }

Compilation message (stderr)

mobile.cpp: In function 'int main()':
mobile.cpp:24:16: warning: variable 'ans' set but not used [-Wunused-but-set-variable]
   24 |         double ans=-1.00;
      |                ^~~

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