[C/C++ 演算法]- 快速排序法（三） – jashliao部落格

#include 
#include 
#include 
#define MAX 10
#define SWAP(x,y) {int t; t = x; x = y; y = t;}

int partition(int[], int, int);
void quickSort(int[], int, int);
int main(void) {
srand(time(NULL));
int number[MAX] = {0};
printf("排序前：");
int i;
for(i = 0; i < MAX; i++) {
number[i] = rand() % 100;
printf("%d ", number[i]);
}
quickSort(number, 0, MAX-1);
printf("\n排序後：");
for(i = 0; i < MAX; i++)
printf("%d ", number[i]);
printf("\n");
return 0;
}
int partition(int number[], int left, int right) {
int i = left - 1;
int j;
for(j = left; j < right; j++) {
if(number[j] <= number[right]) {
i++;
SWAP(number[i], number[j]);
}
}
SWAP(number[i+1], number[right]);
return i+1;
}
void quickSort(int number[], int left, int right) {
if(left < right) {
int q = partition(number, left, right);
quickSort(number, left, q-1);
quickSort(number, q+1, right);
}
}