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Cod sursa(job #661166)
#include<fstream>
using namespace std;
int a[500002],n,i;
void merge(int low,int mid,int high)
{int h,i,j,b[250001],k;
h=low;
i=low;
j=mid+1;
while((h<=mid)&&(j<=high))
{if(a[h]<=a[j])
{b[i]=a[h];
h++;}
else
{b[i]=a[j];
j++;}
i++;}
if(h>mid)
{for(k=j;k<=high;k++)
{b[i]=a[k];
i++;}}
else
{for(k=h;k<=mid;k++)
{b[i]=a[k];
i++;}}
for(k=low;k<=high;k++) a[k]=b[k];}
void merge_sort(int low,int high)
{int mid;
if(low<high)
{mid=(low+high)/2;
merge_sort(low,mid);
merge_sort(mid+1,high);
merge(low,mid,high);}}
main()
{ifstream f("algsort.in");
ofstream g("algsort.out");
f>>n;
for(i=1;i<=n;i++)
{f>>a[i];}
f.close();
merge_sort(1,n);
for(i=1;i<=n;i++)
g<<a[i]<<" ";}