Cod sursa(job #311242)

Utilizator Bogdan_tmmTirca Bogdan Bogdan_tmm Data 3 mai 2009 00:36:55
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.02 kb
#include<iostream>
#include<stdio.h>
#include<vector>
#include<algorithm>
using namespace std;
vector <int> a;
int n,i,x;
void Inter(int st,int dr)
{
	if(st<dr)
	{
		int mij=(st+dr)/2,j;
		Inter(st,mij);
		Inter(mij+1,dr);
		vector <int> aux;aux.resize(dr-st+2);
		merge(a.begin()+st,a.begin()+mij+1,a.begin()+mij+1,a.begin()+dr+1,aux.begin());
		for(i=st,j=0;i<=dr;i++)
			a[i]=aux[j++];
	}
}
void QSort(int st,int dr)
{
	int i=st,j=dr,aux=a[(st+dr)/2];
	do
	{	
		while(i<=j&&a[i]<aux) i++;
		while(i<=j&&a[j]>aux) j--;
		if(i<=j) swap(a[i++],a[j--]);
	}while(i<=j);
	if(i<dr) QSort(i,dr);
	if(st<j) QSort(st,j);
}
inline void Cout(int x)
{
	printf("%d ",x);
}
int main()
{
	freopen("algsort.in","r",stdin);
	freopen("algsort.out","w",stdout);
	scanf("%d",&n);
	for(i=1;i<=n;i++)
	{
		scanf("%d",&x);
		a.push_back(x);
	}
	if(n>200000)
		QSort(0,n-1);
	else
	{
		nth_element(a.begin(),a.begin()+n/2,a.end());
		Inter(0,n-1);
	}
	for_each(a.begin(),a.end(),Cout);
	printf("\n");
	return 0;
}