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Cod sursa(job #745095)
#include<vector>
#include<fstream>
#include<iostream>
#include<cstdlib>
using namespace std;
void swap(int& a, int& b)
{
int aux=a;
a=b;
b=aux;
}
int partition(vector<int>& v, int left, int right)
{
srand(time(NULL));
int len=right-left+1;
int index=rand()%len;
int pivot=v[left+index];
swap(v[left],v[left+index]);
int i=left+1;
for(int j=left+1;j<=right;++j)
{
if(v[j]<=pivot)
{
swap(v[j],v[i]);
++i;
}
}
swap(v[i-1],v[left]);
return i-1;
}
void quick_sort(vector<int>& v, int left, int right)
{
if(left>=right)
return;
int r=partition(v,left,right);
quick_sort(v,left,r-1);
quick_sort(v,r+1,right);
}
int main()
{
FILE *f=fopen("algsort.in","r");
FILE *g=fopen("algsort.out","w");
int n;
vector<int> v;
fscanf(f,"%i",&n);
int nr;
for(int i=0;i<n;++i)
{
fscanf(f,"%i",&nr);
v.push_back(nr);
}
quick_sort(v,0,n-1);
for(int i=0;i<n;++i)
fprintf(g,"%i ",v[i]);
fprintf(g,"%s","\n");
fclose(f);
fclose(g);
}