Submission #863851

#	Time	Username	Problem	Language	Result	Execution time	Memory
863851		Abito	Balloons (CEOI11_bal)	C++17	10 / 100	222 ms	23120 KiB

bal

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#define F first
#define S second
#define pb push_back
#define ppb pop_back
#define ep insert
#define endl '\n'
#define elif else if
#define pow pwr
#define sqrt sqrtt
#define int long long
#define y1 YONE
typedef unsigned long long ull;
using namespace std;
const int N=2e5+5;
double a[N],x[N],R[N];
int n;
int32_t main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    cin>>n;
    for (int i=1;i<=n;i++) cin>>x[i]>>a[i];
    set<pair<double,int>> s;
    R[1]=a[1];
    s.ep({4*R[1]+x[1],1});
    for (int i=2;i<=n;i++){
        double l=0,r=a[i],mid,ans;
        int j=(*--s.end()).S;
        for (int hhh=0;hhh<50;hhh++){
            mid=(l+r)/2;
            bool ok=((x[i]-x[j])*(x[i]-x[j])>=4*mid*R[j] || (x[i]-x[1])*(x[i]-x[1])>=4*mid*R[1]);
            if (ok){
                ans=mid;
                l=mid;
            }else r=mid;
        }R[i]=ans;
        s.ep({R[i]+x[i],i});
    }for (int i=1;i<=n;i++) cout<<fixed<<setprecision(9)<<R[i]<<endl;
    return 0;
}

Compilation message (stderr)

bal.cpp: In function 'int32_t main()':
bal.cpp:37:19: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   37 |         s.ep({R[i]+x[i],i});
      |               ~~~~^~~~~

• Subtask 1: 0 / 10
• Subtask 2: 10 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10