Cod sursa(job #1744170)

Utilizator whoasdas dasdas who Data 19 august 2016 13:45:08
Problema Sortare prin comparare Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.07 kb
#define IA_PROB "algsort"

#include <cassert>
#include <cstdio>
#include <cstring>

#include <iostream>
#include <fstream>

#include <string>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>

#include <algorithm>

using namespace std;

static inline int rand_int(int l, int r) {
	assert(l < r);
	return l + random() % (r - l);
}

void my_qsort_impl(int *v, int l, int r) {
	if (r - l <= 1) return;
	int pivot_idx = rand_int(l, r);
	int pivot = v[pivot_idx];
	swap(v[l], v[pivot_idx]);
	int ge_l = l;
	for (int i = l + 1; i < r; i++) {
		if (v[i] < pivot) {
			swap(v[i], v[ge_l]);
			ge_l++;
		}
	}
	my_qsort_impl(v, l, ge_l);
	my_qsort_impl(v, ge_l + 1, r);
}

void my_qsort(int *v, int n) {
	my_qsort_impl(v, 0, n);
}

int main()
{
	freopen(IA_PROB".in", "r", stdin);
	freopen(IA_PROB".out", "w", stdout);

	int n;
    scanf("%d", &n);
    assert(n > 0);

    int *v = (int*)malloc(n * sizeof(int));
    for (int i = 0; i < n; i++) {
    	scanf("%d", &v[i]);
    }

    my_qsort(v, n);

    for (int i = 0; i < n; i++) {
		printf("%d ", v[i]);
	}

    return 0;
}