利用歸併去除兩個數組重複部分

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);