Submission #236794

#	Time	Username	Problem	Language	Result	Execution time	Memory
236794		michao	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	8 ms	6528 KiB

shoes

#include <bits/stdc++.h>
#define ll long long int
#define mp make_pair
#define pb push_back
#define ld long double
#define pii pair<int,int>
#define sz(x) (int)x.size()
#define piii pair<pii,pii>
#define precise cout<<fixed<<setprecision(10)
#define st first
#define nd second
#define ins insert
#define vi vector<int>
#define BOOST ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
using namespace std;
const int MAX=1<<17;
vi pos[MAX*2];
bool got[MAX*2];
int t[MAX*2];
void update(int u,int v,int c)
{
	for (u+=MAX,v+=MAX;u<v;u>>=1,v>>=1)
	{
		if (u&1)t[u++]+=c;
		if (v&1)t[--v]+=c;
	}
}

int query(int u)
{
	int sum=0;
	for (u+=MAX;u>0;u>>=1)sum+=t[u];
	return sum;
}

ll count_swaps(vi tab2)
{
	ll ans=0;
	int n=sz(tab2);
	int tab[n+1];
	for (int i=0;i<=n;i++)tab[i]=0;
	for (int i=1;i<=n;i++)tab[i]=tab2[i-1];
	for (int i=n;i>=1;i--)
	{
		if (tab[i]<0)tab[i]=-tab[i]+n;
		pos[tab[i]].pb(i);
	}
	for (int i=1;i<=n*2;i++)
	{
		//cout<<"ZAWARTOSC "<<i<<"\n";
		//for (auto it:pos[i])cout<<it<<" ";
		//cout<<"\n";
	}
	for (int i=1;i<=n-1;i++)
	{
		if (got[i])continue;
		got[i]=true;
		int wsk=tab[i];
		if (wsk<n)wsk+=n;
		else wsk-=n;
		while (pos[wsk].back()<i)pos[wsk].pop_back();
		got[pos[wsk].back()]=true;
		int x=pos[wsk].back();
		ans+=x-i-1+(wsk>tab[i])-query(x)+query(i-1);
		update(x,n*2+1,1);
	}
	return ans;
}
/*
int main()
{
	cout<<count_swaps({2, 1, -1, -2});
}
*/

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