Cod sursa(job #2313837)

Utilizator CosaMateiMatei Cosa Gabriel CosaMatei Data 7 ianuarie 2019 15:18:32
Problema Sortare prin comparare Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.05 kb
#include <bits/stdc++.h>

using namespace std;

ifstream in("algsort.in");
ofstream out("algsort.out");

const int NMAX=5e5;

int a[NMAX],N;

void v_merge(int a[],int l, int r, int m)
{
    int i=l;
    int j=m+1;
    int p=l;
    int c[NMAX];
    while(i<=m && j<=r)
    {
        if(a[i]<=a[j])
        {
            c[p++]=a[i++];
        }
        else
        {
            c[p++]=a[j++];
        }
    }
    for(i;i<=m;++i)
    {
        c[p++]=a[i];
    }
    for(j;j<=r;++j)
    {
        c[p++]=a[j];
    }
    for(int i=l;i<p;++i)
    {
        a[i]=c[i];
    }
}

void merge_sort(int a[], int l, int r)
{
    if(l<r)
    {
        int m=(l+r)/2;
        merge_sort(a,l,m);
        merge_sort(a,m+1,r);
        v_merge(a,l,r,m);
    }
    return;
}

void read()
{
    in>>N;
    for(int i=0;i<N;++i)
    {
        in>>a[i];
    }
}

void write()
{
    for(int i=0;i<N;++i)
    {
        out<<a[i]<<" ";
    }
}

int main()
{
    read();
    merge_sort(a,0,N-1);
    write();
    return 0;
}