啊哈！算法 学习2 排序 - 快速排序 2分发排序

#import <Foundation/Foundation.h>
int a[101],n;

void quickSort(int left,int right);

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // insert code here...
        NSLog(@"Hello, World!");
        for (int i = 0; i<10; i++) {
            scanf("%d",&a[i]);
        }
        quickSort(0, 9);
        for (int i = 0; i < 10; i++) {
            NSLog(@"tt == %d",a[i]);
        }
    }
    return 0;
}
void quickSort(int left,int right)
{
    if (left > right)
    {
        return;
    }

    int i,j,t,temp;
    temp = a[left];
    i = left;
    j = right;
    while (i!=j)
    {
        while (a[j] <= temp && j>i) {
            j--;
        }
        while (a[i] >= temp &&i < j) {
            i++;
        }
        if (i < j)
        {
            t = a[i];
            a[i] = a[j];
            a[j] = t;
        }
    }

    a[left] = a[i];
    a[i] = temp;
    quickSort(left, i-1);
    quickSort(i+1, right);

}

demo