Cod sursa(job #1365838)

Utilizator CosminRusuCosmin Rusu CosminRusu Data 28 februarie 2015 16:05:15
Problema Sortare prin comparare Scor 60
Compilator cpp Status done
Runda Arhiva educationala Marime 0.81 kb
#include <fstream>
#include <iostream>

using namespace std;

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

const int maxn = 100005;

int n, a[maxn], b[maxn];

inline void mergesort(int st, int dr) {
    if(st == dr)
        return;
    int mid = ((st + dr) >> 1);
    mergesort(st, mid);
    mergesort(mid + 1, dr);
    int i = st, j = mid + 1;
    int p = st;
    while(i <= mid && j <= dr)
        if(a[i] <= a[j])
            b[p ++] = a[i ++];
        else
            b[p ++] = a[j ++];
    while(i <= mid)
        b[p ++] = a[i ++];
    while(j <= dr)
        b[p ++] = a[j ++];
    for(int i = st ; i <= dr ; ++ i)
        a[i] = b[i];
}

int main() {
    fin >> n;
    for(int i = 1 ; i <= n ; ++ i)
        fin >> a[i];
    mergesort(1, n);
    for(int i = 1 ; i <= n ; ++ i)
        fout << a[i] << " ";
}