Submission #1266764

#	Time	Username	Problem	Language	Result	Execution time	Memory
1266764		hoangmc2009	Balloons (CEOI11_bal)	C++17	100 / 100	102 ms	8264 KiB

bal

#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
using f64 = long double;
i64 n,x[200009],r[200009];
long double y[200009];
vector<int> st;
f64 calc(int i,int j) {return (x[i]-x[j])*(x[i]-x[j])/4.0L/y[i];}
int main()
{
    if(fopen("D:/CPP/THEMIS/test.inp","r"))
    {
        freopen("D:/CPP/THEMIS/test.inp","r",stdin);
        freopen("D:/CPP/THEMIS/test.out","w",stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    cin>>n; cout<<fixed<<setprecision(3);
    for(int i=1;i<=n;++i) cin>>x[i]>>r[i];
    for(int i=1;i<=n;++i)
    {
        y[i]=r[i];
        while(!st.empty())
        {
            y[i]=min(y[i],calc(st.back(),i));
            if(y[i]>=y[st.back()]) st.pop_back();
            else break;
        }
        cout<<y[i]<<"\n";
        st.push_back(i);
    }
    //for(int i=1;i<st.size();++i) assert(y[st[i-1]]>=y[st[i]]);
}

Compilation message (stderr)

bal.cpp: In function 'int main()':
bal.cpp:13:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |         freopen("D:/CPP/THEMIS/test.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:14:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |         freopen("D:/CPP/THEMIS/test.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• 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