Cod sursa(job #1883970)

Utilizator 1475369147896537415369Andrei Udriste 1475369147896537415369 Data 18 februarie 2017 12:52:03
Problema Sortare prin comparare Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.23 kb
#include<cstdio>
#include<ctime>
#include<algorithm>
using namespace std;

int N, myArray[1 << 19];

int Partition(int sequence[], int left, int right){
    int index, pivot, i = left - 1, j = right + 1;

    index = left + rand() % (right - left + 1);
    pivot = sequence[index];

    while(1){
        do{++i;}while(sequence[i] < pivot && i < right);
        do{--j;}while(sequence[j] > pivot && j > 0);
        if(i < j){
            swap(sequence[i], sequence[j]);
        }else{
            int ans = (sequence[i] == pivot) ? i : j;
            if(sequence[j-1] == pivot) ans = j - 1;
            else if(sequence[i+1] == pivot) ans = i + 1;
            return ans;
        }
    }
}
void QuickSort(int sequence[], int left, int right){

    if(left < right){
        int split = Partition(sequence, left, right);
        QuickSort(sequence, left, split - 1);
        QuickSort(sequence, split + 1, right);
    }
}

int main() {

freopen("algsort.in", "r", stdin);
freopen("algsort.out", "w", stdout);

scanf("%d", &N);

for(int i = 0; i < N; i++){
    scanf("%d", &myArray[i]);
}srand(time(NULL));

QuickSort(myArray, 0, N-1);

for(int i = 0; i < N; i++){
    printf("%d ", myArray[i]);
}
return 0;
}