Submission #797945

#	Time	Username	Problem	Language	Result	Execution time	Memory
797945		Mularstyle	Arranging Shoes (IOI19_shoes)	C++14	0 / 100	1 ms	256 KiB

shoes

#include<bits/stdc++.h>
using namespace std;

#include "shoes.h"
#define ll long long
int n;
ll ar[200005];
bool vis[200005];
void up(int idx,int x)
{
    while(idx<=n)ar[idx]+=x,idx+=(idx&-idx);
}

int re(int idx)
{
    ll sum=0;
    while(idx>0)sum+=ar[idx],idx-=(idx&-idx);
    return sum;
}

long long count_swaps(std::vector<int> os) {

    ll ans=0;
    n=os.size();
    int s[n+5];

    for(int i=1;i<=n;i++)
        s[i]=os[i-1];

    vector<int> S[n];
    int pidx[n+5];

    for(int i=1;i<=n;i++)
    {
        up(i,1);
        if(S[abs(s[i])].empty())
            S[abs(s[i])].push_back(i);
        else
        {
            int tmp=S[abs(s[i])].back();
            if(s[i]!=s[tmp])
            {
                pidx[i]=tmp;
                pidx[tmp]=i;
                S[abs(s[i])].pop_back();
            }
            else
            {
                S[abs(s[i])].push_back(i);
            }
        }
    }


    for(int i=1;i<=n;i++)
    {
        if(vis[pidx[i]])continue;
        vis[i]=true;

        ans+=((re(pidx[i])-re(i-1))-2);

        if(ar[i]>0)//rightonleft
           ans++;

        up(i,-1);
        up(pidx[i],-1);

    }

    return ans;

}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 15