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Cod sursa(job #515741)
#include<iostream>
#include<stdio.h>
using namespace std;
void Quick(int* t,int st,int dr, int k ) //Sortarea rapida (!)
{ int i=st,j=dr,w,piv=t[(i+j)/2];
do {
while(t[i] < piv) i++;
while(t[j] > piv) j--;
if(i <= j) {w=t[i]; t[i]=t[j]; t[j]=w; i++; j--;}
}
while(j >= i);
if(st < j) {
if( j - st + 1 >= k ) // daca elementul e in stanga
Quick(t,st,j,k);
}
if(dr > i)
{
if( j - st + 1 < k )// daca elementul e in dreapta
Quick(t,i,dr, k - ( j - st + 1 ));// il scad pe k cu cate elemente sunt in stanga
}
}
int i,v[3000001],n;
int main()
{
freopen("sdo.in","r",stdin);
freopen("sdo.out","w",stdout);
int k;
cin>>n>>k;
for(i=1;i<=n;i++)
{
cin>>v[i];
}
Quick(v,1,n,k);
cout<<v[k];
}