Submission #485121

#	Time	Username	Problem	Language	Result	Execution time	Memory
485121		dz001	Balloons (CEOI11_bal)	C++11	100 / 100	216 ms	6624 KiB

bal

#include <bits/stdc++.h>
using namespace std;

#define sqr(x) (x)*(x)

const double eps=1e-3;
const int N=2e5+10;
stack<int> st;
double ans[N],x[N],R[N];
int n;

signed main()
{
    ios::sync_with_stdio(NULL);
    cin.tie(nullptr);
    cout.precision(3);
    cout<<fixed;

    cin>>n;
    for(int i=0;i<n;++i)cin>>x[i]>>R[i],ans[i]=R[i];
    
    st.push(0);
    for(int i=1;i<n;++i){
        while(!st.empty()){
            ans[i]=min(ans[i],sqr(x[i]-x[st.top()])/(4.*ans[st.top()]));
            if(ans[i]-ans[st.top()]>=eps)st.pop();
            else break;
        }
        st.push(i);
    }

    for(int i=0;i<n;++i)cout<<ans[i]<<'\n';
}

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