Submission #879361

#	Time	Username	Problem	Language	Result	Execution time	Memory
879361		vjudge1	Sure Bet (CEOI17_sure)	C++17	0 / 100	0 ms	348 KiB

sure

#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define lld long long double
#define pb push_back
#define pf push_front
#define all(a) a.begin(),a.end()
#define IShowSpeed ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
const int N=5e5+10;
const int mod=1e9+7;
vector<double>v1,v2;

int main()
{
    IShowSpeed
    int n;
    cin>>n;
    while(n--)
    {
        double x,y;
        cin>>x>>y;
        v1.pb(x);
        v2.pb(y);
    }
    sort(all(v1));
    sort(all(v2));
    reverse(all(v1));
    reverse(all(v2));
    for(int i=1;i<v1.size();i++) v1[i]+=v1[i-1];
    for(int i=1;i<v2.size();i++) v2[i]+=v2[i-1];
    double ans=0;
    for(int i=0;i<v1.size();i++)
    {
        int l=0,r=v1.size()-1,pos=-1;
        while(l<=r)
        {
            int m=(l+r) >> 1;
            double lol=i+m+2;
            if(v1[i]>=lol) l=m+1,pos=m;
            else r=m-1;
        }
        l=0,r=pos;
        while(l<=r)
        {
            int m=(l+r) >> 1;
            double lol=i+m+2;
            if(v2[m]>=lol) l=m+1,ans=max(ans,min(v1[i]-lol,v2[m]-lol));
            else r=m-1;
        }
    }
    cout<<fixed<<setprecision(4)<<ans;
}
/*
4
1.2
1.4
1.6
1.9

1.4
1.5
2
3.7

4
1.4 3.7
1.2 2
2.6 1.4
1.9 1.5

10
1.2 1.1
2 1
2 2.2
5.2 2
4.4 3
1.1 3
10 10.3
2.1 2.13
9 8.9
11 11
27.7000
*/

Compilation message (stderr)

sure.cpp: In function 'int main()':
sure.cpp:29:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<double>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for(int i=1;i<v1.size();i++) v1[i]+=v1[i-1];
      |                 ~^~~~~~~~~~
sure.cpp:30:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<double>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |     for(int i=1;i<v2.size();i++) v2[i]+=v2[i-1];
      |                 ~^~~~~~~~~~
sure.cpp:32:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<double>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     for(int i=0;i<v1.size();i++)
      |                 ~^~~~~~~~~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 40
• Subtask 3: 0 / 40