Cod sursa(job #3128814)

Utilizator CRazvaN6Cutuliga Razvan CRazvaN6 Data 11 mai 2023 01:19:47
Problema Sortare prin comparare Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.36 kb
#include <iostream>
#include <vector>
#include <fstream>

using namespace std;
ifstream f("algsort.in");
ofstream g("algsort.out");

void merge(vector<int>& arr, int left, int mid, int right) {
    int n1 = mid - left + 1;
    int n2 = right - mid;
    vector<int> L(n1), R(n2);
    for (int i = 0; i < n1; i++) {
        L[i] = arr[left + i];
    }
    for (int j = 0; j < n2; j++) {
        R[j] = arr[mid + 1 + j];
    }
    int i = 0, j = 0, k = left;
    while (i < n1 && j < n2) {
        if (L[i] <= R[j]) {
            arr[k++] = L[i++];
        }
        else {
            arr[k++] = R[j++];
        }
    }
    while (i < n1) {
        arr[k++] = L[i++];
    }
    while (j < n2) {
        arr[k++] = R[j++];
    }
}

void mergeSort(vector<int>& arr, int left, int right) {
    if (left < right) {
        int mid = left + (right - left) / 2;
        mergeSort(arr, left, mid);
        mergeSort(arr, mid + 1, right);
        merge(arr, left, mid, right);
    }
}

void printVector(vector<int>& arr) {
    for (int i = 0; i < arr.size(); i++) {
        g << arr[i] << " ";
    }
    g << endl;
}

int main() {
    int n;
    f >> n;
    vector<int> arr;
    for(int i = 0; i < n; ++i){
        int x;
        f >> x;
        arr.push_back(x);
    }
    mergeSort(arr, 0, n - 1);
    printVector(arr);
    return 0;
}