sort.c
author Markus Bröker <mbroeker@largo.dyndns.tv>
Wed, 26 May 2010 14:56:44 +0200
changeset 126 52722ac7693f
parent 77 49e0babccb23
permissions -rw-r--r--
mysql_db: get not more than num_fields fields from a row I haven't tested the old approach, because i have never installed or used mysql. But it's nice to see that it actually works with this small patch. committer: Markus Bröker <mbroeker@largo.homelinux.org>
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/**
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 * sort.c
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 * Copyright (C) 2008 Markus Broeker
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 *
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 * Comparision of Sorting Algorithms
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#ifndef MAX
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#define MAX 50000
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#endif
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unsigned long counter = 0;
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unsigned long iters = 0;
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int compare (int *a, int *b)
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{
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    iters++;
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    if (*a > *b) {
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        counter++;
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        return 1;
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    }
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    return 0;
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}
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void swap (int *v, int i, int j)
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{
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    int old;
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    if (i == j)
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        return;
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    old = v[i];
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    v[i] = v[j];
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    v[j] = old;
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}
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void statistic (char *func)
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{
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    printf ("%8s finished after %10lu swaps and %10lu Iterations.\n", func, counter, iters);
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    counter = iters = 0;
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}
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/**
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 * Laufzeitverhalten: n^2-n Durchläufe zum Sortieren von n Elementen...
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 */
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void lazysort (int *v, int n, int (*compare_func) (int *, int *))
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{
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    int i, j;
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    for (i = 1; i < n; i++) {
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        for (j = 0; j < n; j++) {
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            if (compare_func (&v[j], &v[i])) {
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                swap (v, i, j);
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            }
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        }
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    }
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    statistic ("Lazy");
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}
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/**
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 * Laufzeitverhalten: (1/2)*n^2-n Durchläufe zum Sortieren von n Elementen...
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 */
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void linearsort (int *v, int n, int (*compare) (int *, int *))
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{
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    int i, j;
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    for (i = (n - 1); i > 0; i--) {
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        for (j = 1; j <= i; j++) {
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            if (compare (&v[j - 1], &v[j])) {
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                swap (v, j - 1, j);
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            }
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        }
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    }
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    statistic ("Linear");
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}
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/**
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 * Laufzeitverhalten: ~(1/{2|4})*n^2-n Durchläufe zum Sortieren...
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 */
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void bubblesort (int *v, int n, int (*compare) (int *, int *))
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{
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    int i;
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    int swapped;
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    do {
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        swapped = 0;
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        for (i = 1; i < n; i++) {
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            if (compare (&v[i - 1], &v[i])) {
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                swap (v, i, i - 1);
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                swapped = 1;
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            }
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        }
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        n--;
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    } while (swapped && n >= 1);
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    statistic ("Bubble");
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}
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static int divide (int *v, int left, int right)
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{
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    int i, j, pivot;
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    i = left;
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    j = right - 1;
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    pivot = v[right];
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    do {
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        while (v[i] <= pivot && i < right) {
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            iters++;
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            i++;
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        }
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        while (v[j] >= pivot && j > left) {
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            iters++;
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            j--;
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        }
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        if (i < j) {
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            counter++;
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            swap (v, i, j);
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        }
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        if (v[i] > pivot) {
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            counter++;
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            swap (v, i, right);
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        }
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    } while (i < j);
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    return i;
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}
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void quicksort (int *v, int left, int right)
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{
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    int divisor;
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    if (left < right) {
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        divisor = divide (v, left, right);
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        quicksort (v, left, divisor - 1);
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        quicksort (v, divisor + 1, right);
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    }
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}
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int main (int argc, char **argv)
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{
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    int a[MAX];
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    int b[MAX];
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    int c[MAX];
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    int d[MAX];
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    int e[MAX];
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    int i;
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    srand (time (NULL));
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    for (i = 0; i < MAX; i++) {
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        a[i] = (int)((float)MAX * rand () / (RAND_MAX + 1.0));
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    }
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    memcpy (b, a, sizeof (a));
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    memcpy (c, a, sizeof (a));
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    memcpy (d, a, sizeof (a));
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    memcpy (e, a, sizeof (a));
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    lazysort (a, MAX, &compare);
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    linearsort (b, MAX, &compare);
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    bubblesort (c, MAX, &compare);
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    quicksort (d, 0, MAX - 1);
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    statistic ("mquick");
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    qsort (e, MAX, sizeof (int), (void *)&compare);
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    statistic ("gquick");
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    printf ("PRESS <RETURN> to CONTINUE");
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    while (getchar () != '\n');
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    printf ("%6c %6c %6c %6c %6c\n----------------------------------\n", 'L', 'N', 'B', 'M', 'G');
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    for (i = 0; i < MAX; i++)
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        printf ("%6d %6d %6d %6d %6d\n", a[i], b[i], c[i], d[i], e[i]);
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    return EXIT_SUCCESS;
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}