利用归并去除两个数组重复部分

NSArray *a = @[@1,@3,@4,@5,@8,@9,@10,@32];    NSArray *b = @[@3,@4,@5];    NSLog(@"a:%@\b:%@",a,b);    int j=0,k=0;    int count = 0;    NSMutableArray *arr = [@[] mutableCopy];    while (j < a.count && k < b.count)    {        if (a[j] > b[k]) {            [arr addObject:b[k]];            k++;        }        else if (a[j] < b[k])        {            [arr addObject:a[j]];            j++;        }        else{            j++;            k++;        }        count ++;    }        int i = MAX(j, k);    if (a.count > b.count)    {        for (; i < a.count; i++)        {            [arr addObject:a[i]];        }    }    else    {        for (; i < b.count; i++)        {            [arr addObject:b[i]];        }    }    NSLog(@"%@,%d",arr,count);