Submission #1023217

#	Time	Username	Problem	Language	Result	Execution time	Memory
1023217		12345678	medians (balkan11_medians)	C++17	100 / 100	47 ms	4688 KiB

medians

#include <bits/stdc++.h>

using namespace std;

const int nx=2e5+5;

int n, b[nx], a[nx], vs[nx], l, r, used[nx], cur=2;

struct fenwick
{
    int d[nx];
    void update(int i) {while (i<nx) d[i]++, i+=(i&-i);}
    int query(int i)
    {
        int res=0;
        while (i>0) res+=d[i], i-=(i&-i);
        return res;
    }
} f;

void getl()
{
    while (vs[l]) l++;
}

void getr()
{
    while (vs[r]) r--;
}

int main()
{
    //cin.tie(NULL)->sync_with_stdio(false);
    cin>>n;
    for (int i=1; i<=n; i++) cin>>b[i], vs[b[i]]=1;
    l=1, r=2*n-1;
    a[1]=b[1];
    used[a[1]]=1;
    f.update(a[1]);
    for (int i=3; i<2*n; i++)
    {
        //cout<<"debug "<<i<<' '<<cur<<'\n';
        //for (int j=1; j<cur; j++) cout<<a[j]<<' ';
        //cout<<'\n';
        int idx=(i+1)/2;
        if (!used[b[idx]]) used[b[idx]]=1, f.update(b[idx]), a[cur++]=b[idx];
        while (f.query(b[idx]-1)!=f.query(2*n)-f.query(b[idx])||f.query(b[idx])!=idx)
        {
            if (f.query(b[idx]-1)<=f.query(2*n)-f.query(b[idx])) getl(), vs[l]=1, a[cur++]=l, f.update(l);
            else getr(), vs[r]=1, a[cur++]=r, f.update(r);
        }
    }
    for (int i=1; i<2*n; i++) cout<<a[i]<<' ';
}

• Subtask 1: 65 / 65
• Subtask 2: 35 / 35