Cod sursa(job #2224104)

Utilizator a_h1926Heidelbacher Andrei a_h1926 Data 22 iulie 2018 21:43:33
Problema Sortare prin comparare Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.49 kb
#include <fstream>
#include <vector>
#include <string>
#include <cstdlib>
#include <ctime>

using namespace std;

const string IN_FILE = "algsort.in";
const string OUT_FILE = "algsort.out";

inline int random(const int lower, const int upper) {
    return lower + rand() % (upper - lower + 1);
}

int partition(vector<int>& values, const int from, const int to) {
    const int pivot = values[random(from, to)];
    int i = from - 1, j = to + 1;
    while (true) {
        for (i++; values[i] < pivot; i++);
        for (j--; values[j] > pivot; j--);
        if (i >= j) return j;
        swap(values[i], values[j]);
    }
    return from;
}

void quickSort(vector<int>& values, const int from, const int to) {
    if (from >= to) return;
    const int split = partition(values, from, to);
    quickSort(values, from, split);
    quickSort(values, split + 1, to);
}

void quickSort(vector<int>& values) {
    quickSort(values, 0, int(values.size()) - 1);
}

vector<int> readValues() {
    ifstream in(IN_FILE);
    int n;
    in >> n;
    auto values = vector<int>(n);
    for (int i = 0; i < n; i++) {
        in >> values[i];
    }
    in.close();
    return values;
}

void writeOutput(const vector<int>& values) {
    ofstream out(OUT_FILE);
    for (int i = 0; i < int(values.size()); i++) {
        out << values[i] << (i + 1 < int(values.size()) ? " " : "\n");
    }
    out.close();
}

int main() {
    srand(time(0));
    auto values = readValues();
    quickSort(values);
    writeOutput(values);
    return 0;
}