Pagini recente » Cod sursa (job #1845350) | Cod sursa (job #1661441) | Cod sursa (job #2982090) | Cod sursa (job #1564867) | Cod sursa (job #342571)
Cod sursa(job #342571)
//Quicksort care partitioneaza tot timpul in doua bucati de n/2
#include <cstdio>
#include <cstdlib>
#define N 500001
#define S_MAX 65536
int A[N];
int poz=-1;
char S[S_MAX];
//partitioneaza tot timpul in doua parti de n/2
int part(int a, int b, int k)
{
if (a==b) return a;
int i,j,t,p=a,q=b,r=a+rand()%(b-a)+1;
t=A[a]; A[a]=A[r]; A[r]=t;
//partitioneaza
for (i=0, j=-1; a<b; a+=i, b+=j)
if (A[a]>=A[b])
{
t=A[a]; A[a]=A[b]; A[b]=t;
t=i; i=-j; j=-t;
}
if (a==k) return a;
if (a>k) return part(p,a-1,k);
else return part(a+1,q,k);
}
void sort(int a, int b)
{
if (a<b)
{
int m=part(a,b,(a+b)>>1);
sort(a,m-1);
sort(m+1,b);
}
}
void read(int &x)
{
x=0;
for (; S[poz]<'0' || S[poz]>'9'; ++poz)
if (poz==S_MAX-1)
{
fread(S,1,S_MAX,stdin);
poz=-1;
}
for (; S[poz]>='0' && S[poz]<='9'; ++poz)
{
x=10*x+S[poz]-'0';
if (poz==S_MAX-1)
{
fread(S,1,S_MAX,stdin);
poz=-1;
}
}
}
int main()
{
int n,i;
freopen("algsort.in","r",stdin);
freopen("algsort.out","w",stdout);
fread(S,1,S_MAX,stdin);
read(n);
for (i=1; i<=n; i++) read(A[i]);
sort(1,n);
for (i=1; i<=n; i++) printf("%d ",A[i]);
return 0;
}