Cod sursa(job #2296454)

Utilizator iulianrotaruRotaru Gheorghe-Iulian iulianrotaru Data 4 decembrie 2018 18:17:39
Problema Sortare prin comparare Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.81 kb
#include <fstream>
using namespace std;
ifstream f("algsort.in");
ofstream g("algsort.out");
int n,i,a[1<<19],c[1<<19];
void mere(int *a,int st,int dr,int mid)
{
    int i=st,j=mid+1,k=st;
    while(k<=dr)
    {
        if(j>dr||(i<=mid&&a[i]<=a[j]))
        {
            c[k]=a[i];
            k++;
            i++;
        }
        else
        {
            c[k]=a[j];
            k++;
            j++;
        }
    }
    for(i=st;i<k;++i) a[i]=c[i];
}
void mergesort(int *a,int st,int dr)
{
    if(st<dr)
    {
        int mid=(st+dr)/2;
        mergesort(a,st,mid);
        mergesort(a,mid+1,dr);
        mere(a,st,dr,mid);
    }
    return;
}
int main()
{
    f>>n;
    for(int i=0;i<n;++i) f>>a[i];
    mergesort(a,0,n-1);
    for(int i=0;i<n;++i) g<<a[i]<<' ';
    return 0;
}