Submission #800054

#	Time	Username	Problem	Language	Result	Execution time	Memory
800054		fdnfksd	Sure Bet (CEOI17_sure)	C++14	0 / 100	0 ms	212 KiB

sure

#include<bits/stdc++.h>
#define int long long
using namespace std;
using ll = long long;
const ll maxN=1e5+10;
ll n,a[maxN],b[maxN];
const ll ct=1e10;
bool check(ll mid)
{
    ll j1=n;
    ll j2=n;
    ll tong1=0,tong2=0;
    for(int i=1;i<=2*n;i++)
    {
        while(j1>0&&tong1<i*ct+mid)
        {
            tong1+=a[j1];
            j1--;
        }
        while(j2>0&&tong2<i*ct+mid)
        {
            tong2+=b[j2];
            j2--;
        }
        if(2*n-j1-j2<=i&&tong1>=i*ct+mid&&tong2>=i*ct+mid) return true;
    }
    return false;
}
using ld=long double;
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    //freopen( "surebet.INP", "r", stdin);
    //freopen( "surebet.OUT", "w", stdout);
    cin >> n;
    for(int i=1;i<=n;i++)
    {
        ld x,y;
        cin >> x >> y;
        x*=ct;
        y*=ct;
        a[i]=x;
        b[i]=y;
    }
    sort(a+1,a+n+1);
    sort(b+1,b+n+1);
    ll low=0,high=1e18;
    while(low<=high)
    {
        ll mid=low+high>>1ll;
        if(check(mid)) low=mid+1;
        else high=mid-1;
    }
    ld ans;
    ans=(ld)high/ct;
    cout <<fixed<<setprecision(4)<< ans;
}

Compilation message (stderr)

sure.cpp: In function 'int main()':
sure.cpp:51:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   51 |         ll mid=low+high>>1ll;
      |                ~~~^~~~~

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