Cod sursa(job #2281342)
Utilizator | Data | 12 noiembrie 2018 08:18:57 | |
---|---|---|---|
Problema | Statistici de ordine | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 0.61 kb |
#include<fstream>
#include<ctime>
#include<cstdlib>
using namespace std;
ifstream cin("sdo.in");
ofstream cout("sdo.out");
int n,k,a[3000005];
void Kth_element(int s,int d){
if(s>=d) return;
int pivot=a[s+rand()%(d-s+1)];
int i=s-1,j=d+1;
while(i<j){
do{++i;}while(a[i]<pivot);
do{--j;}while(a[j]>pivot);
if(i<j){
swap(a[i],a[j]);
}
}
if(k<=j) Kth_element(s,j);
else Kth_element(j+1,d);
}
int main(){
srand(time(NULL));
cin>>n>>k;
for(int i=1;i<=n;i++)
cin>>a[i];
Kth_element(1,n);
cout<<a[k];
}