Submission #486809

#	Time	Username	Problem	Language	Result	Execution time	Memory
486809		Haidara	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	8 ms	9676 KiB

shoes

#include<bits/stdc++.h>
#include<shoes.h>
#define rep(i,x,n) for(int i=(x);i<(n);i++)
#define FOR(i,n) rep(i,0,n)
#define v(i) vector< i >
#define ll long long 
using namespace std;
const ll inf=1LL<<62LL;
const ll mod=1e9+7;
const ll maxn=100200;
ll st[maxn];
int n;
int query(int pos,int l=1,int r=n,int inx=1)
{
	if(l==r)
		return st[inx];
	int mid=l+(r-l)/2;
	st[inx*2]+=st[inx];
	st[inx*2+1]+=st[inx];
	st[inx]=0;
	if(pos<=mid)
		return query(pos,l,mid,inx*2);
	return query(pos,mid+1,r,inx*2+1);
}
void update(int ql,int qr,int l=1,int r=n,int inx=1)
{
	if(ql<=l&&r<=qr){
		st[inx]++;
		return ;
	}
	if(ql>r||l>qr)
		return ;
	st[inx*2]+=st[inx];
	st[inx*2+1]+=st[inx];
	st[inx]=0;
	int mid=l+(r-l)/2;
	update(ql,qr,l,mid,inx*2);
	update(ql,qr,mid+1,r,inx*2+1);
}
ll count_swaps(v(int)a)
{
	ll ans=0;
	n=a.size();
	set<int>posl[maxn],posr[maxn];
	FOR(i,n)
	if(a[i]<0)
		posl[-a[i]].insert(i);
	else 
		posr[a[i]].insert(i);
	v(bool)vis(maxn,0);
	FOR(i,n)
	{
		if(vis[i])
			continue;
		if(a[i]>0)
			ans++;
		a[i]=abs(a[i]);
		auto right=posr[a[i]].begin();
		auto left=posl[a[i]].begin();
		vis[*right]=1;
		vis[*left]=1;
		ans+=(abs(*right-*left)-1+abs(query(*right+1)-query(*left+1)));
		if(*left<*right)
			update(*left+1,*right+1);
		else 
			update(*right+1,*left+1);
		posl[a[i]].erase(left);
		posr[a[i]].erase(right);
	}
	return ans;
}

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