Submission #1183095

#	Time	Username	Problem	Language	Result	Execution time	Memory
1183095		mmusom	Balloons (CEOI11_bal)	C++20	0 / 100	115 ms	131072 KiB

bal

#include<bits/stdc++.h>

#define int long long

using namespace std;

//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//using namespace __gnu_pbds;

//#define ordered_multiset tree<long long, null_type,less_equal<long long>, rb_tree_tag,tree_order_statistics_node_update>
//#define ordered_set tree<long long, null_type,less<long long>, rb_tree_tag,tree_order_statistics_node_update>

//st.order_of_key
//st.find_by_order

main(){
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
//        freopen("deleg.in", "r", stdin);
//        freopen("deleg.out", "w", stdout);
    #endif
    ios_base::sync_with_stdio(NULL);
    cin.tie(NULL);
    cout.tie(NULL);
    int n;
    cin>>n;
    vector<int> x(n+1),h(n+1);
    for(int i=1;i<=n;++i){
        cin>>x[i]>>h[i];
    }
    vector<double> ans(n+1);
    double eps=1e-4;
    for(int i=1;i<=n;++i){
        if(i==1){
            ans[i]=h[i];
        }else{
            double l=0,r=h[i]+eps;
            while(l<r-eps){
                double mid=(l+r)/2;
                bool ok=0;
                for(int j=1;j<i;++j){
                    if((x[i]-x[j])*(x[i]-x[j])+(ans[j]-mid)*(ans[j]-mid)<(ans[j]+mid)*(ans[j]+mid)){
                        ok=1;
                        break;
                    }
                }
                if(ok){
                    r=mid;
                }else{
                    l=mid;
                }
            }
            ans[i]=l;
        }
        cout<<fixed<<setprecision(4)<<ans[i]<<"\n";
    }
}

Compilation message (stderr)

bal.cpp:17:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   17 | main(){
      | ^~~~
bal.cpp: In function 'int main()':
bal.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
bal.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 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