oj.uz

Submission #361399

# Submission time Handle Problem Language Result Execution time Memory
361399 2021-01-29T18:00:40 Z bigDuck Sure Bet (CEOI17_sure) C++14
0 / 100
 1 ms 364 KB 
#include<bits/stdc++.h>
using namespace std;
#define INIT  ios_base :: sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define mp make_pair
#define pb push_back
#define ft first
#define sc second
#define ll long long
#define pii pair<int, int>
#define count_bits __builtin_popcount
#define int ll

int t, n, m, k, a[300010], b[100010];


int s1[100010], s2[100010];
multiset<pii> sum1, sum2;

int32_t main(){
INIT
cin>>n;

for(int i=1; i<=n; i++){
    long double d; cin>>d;
    d=d*10000;
    a[i]=(int) d;
    //cout<<d<<"\n";
    cin>>d;
    d=d*10000;
    b[i]=(int)d;
}

sort(a+1, a+1+n);
sort(b+1, b+1+n);


for(int i=n; i>=1; i--){
    s1[i]=s1[i+1]+a[i];
    sum1.insert({s1[i], i});
    s2[i]=s2[i+1]+b[i];
    sum2.insert({s2[i], i});
}

int res=0;
for(int k=1; k<=2*n; k++){
    auto it=sum1.lower_bound({k*10000, 0});
    if(it==sum1.end()){
        continue;
    }
    int ac1=it->ft, k1=(n-it->sc)+1;
    int k2=k-k1, ac2=s2[n-k2+1];
    res=max(res, min(ac1, ac2)-k*10000);
     //cout<<ac1<<" "<<ac2<<"\n";
    if(s1>s2){
        continue;
    }
    int l=1, r=n, mid=(r+l)>>1ll;
    while(l<r){
        mid=(l+r)>>1ll;
        if( ((k1+mid)<=n) && (s1[n-(k1+mid)+1]<=s2[n-(k2-mid)+1]) && ( (k1-mid)>=1 ) ){
            l=mid+1;
        }
        else{
            r=mid;
        }
        mid=(l+r)>>1ll;
    }
    if( ( (k1+mid)>n ) || ( (k2-mid)<1 ) ){
        mid--;
    }
    if(mid<0){continue;}
    ac1=s1[n-(k1+mid)+1], ac2=s2[n-(k2-mid)+1];
    res=max(res, min(ac1, ac2)-k*10000);
    if(mid<0){continue;}
    mid--;
    ac1=s1[n-(k1+mid)+1], ac2=s2[n-(k2-mid)+1];
    res=max(res, min(ac1, ac2)-k*10000);

}
cout<<fixed<<setprecision(4)<<(res/10000.000000);

return 0;
}

Subtask #1
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Incorrect 0 ms 364 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Incorrect 0 ms 364 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 364 KB Output is correct
2 Incorrect 0 ms 364 KB Output isn't correct
3 Halted 0 ms 0 KB -