Cod sursa(job #2077524)

Utilizator sandupetrascoPetrasco Sandu sandupetrasco Data 28 noiembrie 2017 10:37:07
Problema Sortare prin comparare Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.77 kb
#include <cstdio>
#include <cstdlib>

int n, A[500100];

void swap(int &a, int &b){
	int tmp = a;
	a = b;
	b = tmp;
}

int part(int st, int dr){
	int pivot = st + (rand() % (dr - st + 1));
	
	int idx_min = st - 1, idx_max = dr + 1;
	while (1){
		do{ idx_min++; }while(A[idx_min] < A[pivot]);
		do{ idx_max--; }while(A[idx_max] > A[pivot]);
		
		if (idx_min >= idx_max) return idx_max;
		
		swap(A[idx_min], A[idx_max]);
	}
}

void quickSort(int st, int dr){
	if (st < dr){
		int mid = part(st, dr);
		quickSort(st, mid);
		quickSort(mid + 1, dr);
	}
}


int main(){
	freopen("algsort.in", "r", stdin);
	freopen("algsort.out", "w", stdout);
	scanf("%d", &n);
	for (int i = 1; i <= n; i++) scanf("%d", &A[i]);
	quickSort(1, n);
	for (int i = 1; i <= n; i++) printf("%d ", A[i]);
	return 0;
}