Submission #596128

#	Time	Username	Problem	Language	Result	Execution time	Memory
596128		Koosha_mv	Arranging Shoes (IOI19_shoes)	C++14	100 / 100	72 ms	20192 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
#define dbgv(v) cout<<#v<<" = "; f(i,0,int(v.size())) cout<<v[i]<<" "; cout<<endl
#define dbga(a,x,y) cout<<#a<<" = "; f(i,x,y) cout<<a[i]<<" "; cout<<endl
#define erorp(x) cout<<#x<<"={"<<x.F<<" , "<<x.S<<"}"<<endl
#define eror(x) cout<<#x<<'='<<(x)<<endl
#define f_(i,a,b) for(int i=a;i>=b;i--)
#define f(i,a,b) for(int i=a;i<b;i++)
#define nb(x) __builtin_popcount(x)
#define all(v) v.begin(),v.end()
#define bit(n,k) (((n)>>(k))&1)
#define Add(x,y) x=(x+y)%mod
#define maxm(a,b) a=max(a,b)
#define minm(a,b) a=min(a,b)
#define lst(x) x[x.size()-1]
#define sz(x) int(x.size())
#define mp make_pair
#define ll long long
#define pb push_back
#define S second
#define F first

const int N=2e5+99;

int n,a[N],L[N],R[N],fen[N];
ll ans;
vector<int> A[N],B[N];

void add(int x,int val){
	for(x++;x>0;x-=(x&-x)){
		fen[x]+=val;
	}
}
int get(int x){
	int res=0;
	for(x++;x<N;x+=(x&-x)){
		res+=fen[x];
	}
	return res;
}
ll count_swaps(vector<int> D) {
	n=D.size()/2;
	f(i,0,2*n){
		a[i]=D[i];
		if(a[i]>0) A[a[i]].pb(i);
		else B[-a[i]].pb(i);
	}
	int cnt=0;
	f(i,1,n+1){
		f(j,0,int(A[i].size())){
			L[cnt]=B[i][j],R[cnt]=A[i][j];
			if(R[cnt]<L[cnt]){
				ans++;
				swap(L[cnt],R[cnt]);
			}
			cnt++;
		}
	}
	vector<int> vec(n);
	iota(all(vec),0);
	sort(all(vec),[&](int u,int v){ return L[u]<L[v]; });
	//dbgv(vec);
	f(i,0,n){
		ans+=get(L[vec[i]])+get(R[vec[i]]);
		add(R[vec[i]],1);
	}
	return ans;
}

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