Submission #246218

#	Time	Username	Problem	Language	Result	Execution time	Memory
246218		Evirir	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	431 ms	39672 KiB

shoes

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;

#define watch(x) cout<<(#x)<<"="<<(x)<<'\n'
#define mset(d,val) memset(d,val,sizeof(d))
#define setp(x) cout<<fixed<<setprecision(x)
#define forn(i,a,b) for(int i=(a);i<(b);i++)
#define fore(i,a,b) for(int i=(a);i<=(b);i++)
#define pb push_back
#define F first
#define S second
#define pqueue priority_queue
#define fbo find_by_order
#define ook order_of_key
typedef long long ll;
typedef pair<ll,ll> ii;
typedef vector<ll> vi;
typedef vector<ii> vii;
typedef long double ld;
typedef tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update> pbds;
void amin(ll &a, ll b){ a=min(a,b); }
void amax(ll &a, ll b){ a=max(a,b); }
void YES(){cout<<"YES\n";} void NO(){cout<<"NO\n";}
void SD(int t=0){ cout<<"PASSED "<<t<<endl; }
const ll INF = ll(1e18);
const int MOD = 998244353;

class PointSegmentTree{
private:
	int size_;
	vector<ll> v;
	
	void update(int p, ll val, int k, int l, int r)
	{
		if(p < l || r < p) return;
		if(l == r){
			v[k]+=val;	//modification
			return;
		}
		int mid = (l+r)>>1;
		update(p, val, k*2, l, mid);
		update(p, val, k*2+1, mid+1, r);
		v[k] = merge(v[k*2], v[k*2+1]);
	}
	
	ll query(int s, int e, int k, int l, int r)
	{
		if(e < l || r < s) return 0; //dummy value
		if(s <= l && r <= e) return v[k];
		int mid = (l+r)>>1;
		ll lc = query(s, e, k*2, l, mid);
		ll rc = query(s, e, k*2+1, mid+1, r);
		return merge(lc, rc);
	}
	
public:
	PointSegmentTree(): v(vector<ll>()) {}
	PointSegmentTree(int n){
		for(size_=1;size_<n;) size_<<=1;
		v.resize(size_*4,1);
	}
	//void reset(){}
	inline ll merge(ll x, ll y){
		return x+y;
	}
	inline void update(int p, ll val){
		update(p, val, 1, 0, size_-1);
	}
	inline ll query(int l, int r){
		return query(l, r, 1, 0, size_-1);
	}
};
bool DEBUG = 0;
const int MAXN = 100005;

map<int,set<int>> loc;

ll count_swaps(vector<int> a)
{
	int n = a.size();
	PointSegmentTree fw(n);
	
	forn(i,0,n){
		loc[a[i]].insert(i);
	}
	
	ll ans = 0;
	
	forn(i,0,n)
	{
		if(DEBUG) SD(i);
		if(fw.query(i,i)==0){
			if(DEBUG) cout<<"continued"<<endl;
			continue;
		}
		
		if(a[i]>0) ans++;
		int nxt = *loc[-a[i]].begin();
		
		ans += fw.query(i+1,nxt-1);
		
		fw.update(i,-1);
		fw.update(nxt,-1);
		loc[a[i]].erase(loc[a[i]].begin());
		loc[-a[i]].erase(loc[-a[i]].begin());
		
		if(DEBUG) cout<<"ans="<<ans<<endl;
	}
	
	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