快速排序_C語言_數組

#include <stdio.h>

void quickSort(int *, int, int);
int searchPos(int *, int, int);

int main(int argc, const char * argv[]) {

    //定義亂序數組
    int a[10] = {9, 3, 4, 6, 1, 2, 7, 8, 5, 0};

    //排序前輸出:
    printf("亂序:\n");
    for (int i = 0; i < 10; i++) {
        printf("%d ",a[i]);
    }
    printf("\n\n");

    //排序
    quickSort(a, 0, 10);

    //排序後輸出:
    printf("順序:\n");
    for (int i = 0; i < 10; i++) {
        printf("%d ",a[i]);
    }
    printf("\n");

    return 0;
}

void quickSort(int *a, int low, int height) {
    int pos;

    if (low < height) {
        pos = searchPos(a, low, height);
        quickSort(a, low, pos - 1);
        quickSort(a, pos + 1, height);
    }
}

int searchPos(int *a, int low, int height) {
    int val = a[low];

    while (low < height) {
        while (low < height && a[height] > val) {
            height --;
        }
        a[low] = a[height];

        while (low < height && a[low] < val) {
            low ++;
        }
        a[height] = a[low];
    }
    a[low] = val;

    return low;
}