object版的快排

#import "QuickSort.h"

@implementation QuickSort
-(int)helpMethod:(NSMutableArray*)array left:(int)left right:(int)right{
    NSNumber* record=array[left];
    while (left<right) {
        while (left<right&&array[right]>=record) {
            right--;
        }
        array[left]=array[right];
        
        while (left<right&&array[left]<=record) {
            left++;
        }
        array[right]=array[left];
    }
    array[left]=record;
    return left;
}

-(void)main:(NSMutableArray *)array left:(int)left right:(int)right{
    if (left<right) {
        int middleIndex=[self helpMethod:array left:left right:right];
        [self main:array left:left right:middleIndex-1];
        [self main:array left:middleIndex+1 right:right];
    }
}
@end