Pagini recente » Cod sursa (job #207508) | Rating Ioana Roceanu (IoanaRoc) | foxter | Istoria paginii runda/2016.02.03-verificare | Cod sursa (job #2010235)
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <ctime>
using namespace std;
ifstream in("algsort.in");
ofstream out("algsort.out");
#define ll long long
#define ull unsigned long long
#define ui unsigned int
#define pb push_back
const int NMax = 5e5 + 5;
int N;
int v[NMax];
void qSort(int,int);
int part(int,int);
int main() {
in>>N;
for (int i=1;i <= N;++i) {
in>>v[i];
}
srand(time(0));
qSort(1,N);
for (int i=1;i <= N;++i) {
out<<v[i]<<' ';
}
return 0;
}
void qSort(int st,int dr) {
if (st >= dr) {
return;
}
int idx = part(st,dr);
qSort(st,idx);
qSort(idx+1,dr);
}
int part(int st,int dr) {
swap(v[rand()%(dr-st+1) + st],v[st]);
int pivot = v[st];
int i = st-1,j = dr+1;
while (true) {
do {
++i;
}
while (v[i]<pivot);
do {
--j;
}
while (v[j]>pivot);
if (i < j) {
swap(v[i],v[j]);
}
else {
return j;
}
}
}