Cod sursa(job #1009739)

Utilizator lucky1992Ion Ion lucky1992 Data 13 octombrie 2013 19:07:44
Problema Sortare prin comparare Scor 60
Compilator cpp Status done
Runda Arhiva educationala Marime 0.94 kb
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <algorithm>

using namespace std;

#define NMax 1000001
int pivot, i,j, A[NMax],q, N, chose;

int partition( int* A, int left, int right ){
		
		chose = rand()%(right-left+1);
		pivot = A[left+chose];
		swap( A[left], A[left+chose] );
		i = left + 1;
		for( j = left+1; j <= right; j++ )
			if( A[j] <= pivot ){
				swap( A[i], A[j] );
				i++;
			}
		swap( A[left], A[i-1] );
		
		return i-1;

}


void QuickSort( int* A, int left, int right ){

	if( left  >= right )
		return ;
	else{
		q = partition( A,left,right );
		QuickSort(A, left, q-1);
		QuickSort(A, q+1, right);
	}
}

int main (){

	freopen("algsort.in", "r", stdin );
	freopen("algsort.out", "w", stdout );
	
	scanf("%d",&N);
	
	for( int i = 0; i < N; i++ )
		scanf("%d", &A[i]);
	
	QuickSort(A,0,N-1);
	
	for( int i = 0; i < N; i++ )
		printf("%d ", A[i] );
		
	return 0 ;

}