Cod sursa(job #2900230)

Utilizator Idk.Voicu Stefan Idk. Data 10 mai 2022 15:44:19
Problema Sortare prin comparare Scor 0
Compilator c-64 Status done
Runda Arhiva educationala Marime 1.22 kb
#include <stdio.h>
void merge(int arr[], int l, int m, int r)
{
    int i, j, k;
    int n1 = m - l + 1;
    int n2 = r - m;
    int L[n1], R[n2];
    for (i = 0; i < n1; i++)
        L[i] = arr[l + i];
    for (j = 0; j < n2; j++)
        R[j] = arr[m + 1 + j];

    i = 0;
    j = 0;
    k = l;
    while (i < n1 && j < n2) {
        if (L[i] <= R[j]) {
            arr[k] = L[i];
            i++;
        }
        else {
            arr[k] = R[j];
            j++;
        }
        k++;
    }
    while (i < n1) {
        arr[k] = L[i];
        i++;
        k++;
    }
    while (j < n2) {
        arr[k] = R[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 arr[500000];
    int n;
    FILE*in = fopen("algsort.in", "r");
    FILE*out = fopen("algsort.out", "w");
    fscanf(in, "%d", &n);
    int i;
    for (i = 0; i < n; i++) {
        fscanf(in, "%d", &arr[i]);
    }
    mergesort(arr, 0, n);
    for (i = 0; i < n; i++) {
        fprintf(out , "%d ", arr[i]);
    }
}