Cod sursa(job #2897316)

Utilizator anaella2010Chiriac Ella anaella2010 Data 3 mai 2022 14:38:41
Problema Sortare prin comparare Scor 20
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.21 kb
#include <iostream>
#include <fstream>
#define NMAX 500000
using namespace std;
ifstream f("algsort.in");
ofstream g("algsort.out");
void merge(int arr[], int p, int q, int r) {

    int n1 = q - p + 1;
    int n2 = r - q;

    int L[n1], M[n2];

    for (int i = 0; i < n1; i++)
        L[i] = arr[p + i];
    for (int j = 0; j < n2; j++)
        M[j] = arr[q + 1 + j];

    int i, j, k;
    i = 0;
    j = 0;
    k = p;

    while (i < n1 && j < n2) {
        if (L[i] <= M[j]) {
            arr[k] = L[i];
            i++;
        } else {
            arr[k] = M[j];
            j++;
        }
        k++;
    }

    while (i < n1) {
        arr[k] = L[i];
        i++;
        k++;
    }

    while (j < n2) {
        arr[k] = M[j];
        j++;
        k++;
    }
}

void mergeSort(int arr[], int l, int r) {
    if (l < r) {
        int m = l + (r - l) / 2;

        mergeSort(arr, l, m);
        mergeSort(arr, m + 1, r);

        merge(arr, l, m, r);
    }
}

int main() {
    int n, arr[100];
    f>>n;
    for(int i=0;i<n;i++){
        f>>arr[i];
    }

    mergeSort(arr, 0, n - 1);

    for(int i=0; i<n; i++){
        g<<arr[i]<<" ";
    }
    return 0;
}