Submission #1248876

#	Time	Username	Problem	Language	Result	Execution time	Memory
1248876		PokemonMaster	Balloons (CEOI11_bal)	C++20	10 / 100	289 ms	6696 KiB

bal

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define cantinue continue
signed main()
{
    int n;
    cin>>n;
    vector <double> x(n+1);
    vector <double> r(n+1);
    for(int i=1;i<=n;i++)cin>>x[i]>>r[i];
    vector <double> rad(n+1);
    vector <int> stk;
    for(int i=1;i<=n;i++)
    {
        rad[i]=r[i];
        int sz=stk.size()-1;
        while(stk.size()>1 && (x[i]-x[stk[sz]])*(x[i]-x[stk[sz]])<=4*rad[stk[sz]]*rad[i])stk.pop_back();
        if(stk.size())
        {
            int sz=stk[stk.size()-1];
            rad[i]=min(rad[i],(x[i]-x[sz])*(x[i]-x[sz])/(4*rad[sz]));
        }
        stk.push_back(i);
    }
    for(int i=1;i<=n;i++)cout<<fixed<<setprecision(3)<<rad[i]<<endl;
}
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