Cod sursa(job #1333051)

Utilizator TeodorescuStefanEduardTeodorescu Stefan Eduard TeodorescuStefanEduard Data 2 februarie 2015 18:43:38
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.81 kb
#include <fstream>
#define DIM 500002

using namespace std;

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

int N,v[DIM];
void interclasare(int p,int m,int u){
    int b[u-p+2],i=p,j=m+1,k=0;
    while(i<=m && j<=u)
        if(v[i]<v[j])
            b[++k]=v[i++];
        else
            b[++k]=v[j++];
    for(;i<=m;i++)
        b[++k]=v[i];
    for(;j<=u;j++)
        b[++k]=v[j];
    for(i=p;i<=u;i++)
        v[i]=b[i-p+1];
}
void mergesort(int p,int u){
    if(p==u)
        return ;
    int mid=(p+u)>>1;
    mergesort(p,mid);
    mergesort(mid+1,u);
    interclasare(p,mid,u);
}
int main(){
    fin>>N;
    for(int i=1;i<=N;i++)
        fin>>v[i];
    mergesort(1,N);
    for(int i=1;i<=N;i++)
        fout<<v[i]<<" ";
    fin.close();fout.close();
    return 0;
}