Submission #121252

#	Time	Username	Problem	Language	Result	Execution time	Memory
121252		miguel	Sure Bet (CEOI17_sure)	C++14	100 / 100	149 ms	3664 KiB

sure

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define vi vector<double>
#define pb push_back
#define INF 1e9+7
int n;
vi a, b;

int main(){
    cin>>n;
    //cin.tie(0);    //random_device dev;
    //mt19937 rng(dev());
    //uniform_int_distribution<std::mt19937::result_type> dist6(5,6);
    //srand((unsigned)time(0));
    //int i;
    //i=(rand()%2)+5;
    a.pb(INF); b.pb(INF);
    for(int i=1; i<=n; i++){
        double x,y;
        cin>>x>>y;
        a.pb(x);
        b.pb(y);
    }
    sort(a.begin(), a.end(), greater<double>());
    sort(b.begin(), b.end(), greater<double>());
    //for(int i=1; i<=n; i++) cout<<a[i]<<" ";cout<<endl;
    a[0]=0; b[0]=0;
    for(int i=1; i<=n; i++){
        a[i]+=a[i-1];
    }
    for(int i=1; i<=n; i++){
        b[i]+=b[i-1];
    }
    double mx=0;
    for(double x=0, y=0; x<=n && y<=n;){
        if(a[x]<b[y]){
            x++;
        }
        else y++;
        mx=max(mx, min(a[x]-x-y, b[y]-x-y));
        //cout<<x<<" "<<y<<" "<<min(a[x]-x-y, b[y]-x-y)<<endl;
    }
    printf("%.4lf",(double)mx);
}

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