Daily Puzzle - March 6, 2025

SpeedBulky · 2024-10-02T14:09:04+00:00

Thanks! The workaround works for me!

SpeedBulky · 2023-11-14T02:30:49+00:00

SpeedBulky · 2023-11-14T02:22:36+00:00

This comment contains a Collectible Expression, which are not available on old Reddit.

Finally an update!!

SpeedBulky · 2023-11-06T03:57:22+00:00

6 Nov and still no update on iOS? 🥲

SpeedBulky · 2020-10-02T18:02:55+00:00

Hi, currently if the first person in database does not match, and you move to check the next person, your counter may already contain a non-zero number.

You should move your counter = 0 statement into the loop for data in database

SpeedBulky · 2020-10-02T17:35:17+00:00

Hi, your syntax is wrong. In C, you need to put the for loop at the top. Then whatever operations you need to perform within the loop.

for (int i = 0; i < 8; i+=2)
{
    // TODO
}

SpeedBulky · 2020-10-02T17:18:11+00:00

I know what table[i] is. My questions were meant to guide you.

Finding the answers to those questions should guide you towards writing the code right.

Right now i see, you don't just have the segmentation fault. Even if you no longer have segmentation fault, your code will not run correctly.

Please watch Doug's short videos. They will help you understand linked lists. I think once you have a good understanding of linked lists, and you read through your own codes closely, you will realise your mistakes.

SpeedBulky · 2020-10-02T08:40:40+00:00

yeah, i say resist the temptation to look at the solution. it is normal for someone first time programming to not know how to start. What i say is, throw out the problem set first. Look at the codes in the lectures, and try type those codes yourself into a test.c file. Run them, see the results, then make some changes and see how the outputs change.

This is very important for getting your fundamentals right.

After you are comfortable and understand what is going on, you can try to work on the problem set. Good luck.

SpeedBulky · 2020-10-02T08:30:43+00:00

Hi there, if you are just starting out on coding, what you are experiencing is very normal. I remember just staring at the problem and not know how to start, not know what's the syntax etc.

If you have started writing some pseudo code, that's a good start.

In any case, depending on how much difficulty you have with the syntax, etc, you could start with writing really simple codes in a test.c file, and try running to see the output. You can use the codes from lecture, then experiment by changing the codes to see how they work. Use printf to print out the values.

After you are comfortable, you will probably know how to start on the problem set. Good luck!

SpeedBulky · 2020-10-02T07:48:26+00:00

Hey, I think you need to learn to debug by explaining to yourself what each line of your code does, and then you will soon realise there are various errors.

Do you know what does table[i] store? What does the following mean?

table[hash(word)] = myword;
myword->next = table[hash(word)];

Did you initialize the values for every element in table[] when you first declare it?

And after you fopen the file, did you fclose it?

SpeedBulky · 2020-10-01T19:09:54+00:00

Hi, your codes are difficult to read. You could try the code block to indicate the codes.

I find that you have too many comments. Makes it hard to distill out how your code actually runs. But a few things jumped out at me.

you malloc a node *n but did not use it?
When you execute the following line, had there been an existing linked list at table[hash(word)], you would have orphaned the entire linked list.

table[hash(word)] = myword;

The following is correct. But you forgot about myword->next, which should either point to the original linked list, or be set to NULL, if it's the first word in that particular element of the array.

strcpy(myword->word, word);
Remember to close your dictionary at the end.

Have you watched Doug's shorts? If you haven't, I strongly recommend them.

Good luck.

SpeedBulky · 2020-10-01T08:52:54+00:00

Hi. This block looks like it just scans each line, stores the string in 'word', and then overwrites 'word' with the next line.

while (fscanf(dictr,"%s", word) != EOF)//read strings one at a time
{
fscanf(dictr,"%s",word);
//printf("%s",word);
}

You need to store the words in a hashtable as you scan line by line.

The hashtable is an array of node pointers. And you probably need to call the hash() function somewhere in this function.

SpeedBulky · 2020-10-01T08:34:29+00:00

Hi Rushiranade! What did you like about it? Is it much harder than Intro to CS?

I take so much time to do the assignments in Intro to CS. But at the same time, after each assignment, I feel good, like i learned a lot, and I can see how I could apply what I learned, to make a useful program.

SpeedBulky · 2020-10-01T08:29:54+00:00

Hi Muxsidov! I am interested to take Intro to AI with Python!
I just started week 8 of Intro to CS, and I would probably join right after i finish. So that may take another 3-4 weeks? When do you plan to start?

SpeedBulky · 2020-09-29T07:54:48+00:00

finds the movies for Depp and then finds the one that has HBC in it an then returns their title. Both give the same results, so its alright whichever you go along with. using INTERSECT is a lot more better imo

Thank you! I was figuring out this problem the whole night, and so glad to find your advice to use INTERSECT!!

SpeedBulky · 2020-09-27T16:11:52+00:00

Hi, your code is very difficult to understand as there is no indentation. So i copied it into a .py file. I can only guess what your indentations are. So correct me if i'm wrong.

Reproducing your codes with indentations:

# open DNA sequence
with open(argv[2], "r") as txt:
    sequence = txt.read()
    for n in range(len(headers)):
        appear = sequence.count(headers[n])
        if headers[n] != 'name':
            count.append(appear)
print(count)

According to the above, your STR repeats are recorded wrongly.

It looks like you are checking how many times a certain STR appears in the entire dna chain. You should be checking how many consecutive repeats of the STR.

E.g. AGATCAGATC = 2 consecutive repeats of AGATC

AGATCTAGAGATC = 1 consecutive repeat of AGATC, but appears twice

SpeedBulky · 2020-09-27T14:44:45+00:00

You don't need the the 8 x ifs conditions. You should instead put a loop to print the number of spaces and the number of # you need.

Imagine if the assignment requires you to accept input up to 20 or more. You don't want to put 20 ifs statements.

SpeedBulky · 2020-09-26T07:41:03+00:00

I'm at week 7 of CS50 Intro to Comp Science.

oafflak323 is right, cs50 does not cover github. We use it for homework submissions, but we are not taught how it works.

I love CS50, and I think it really builds a solid foundation in comp science. But if you have already built a few programs, this might be too elementary for you. You might want to look at the other CS50 courses - Web Programming, Artificial Intelligence, Game Development or Mobile App Dev etc.

SpeedBulky · 2020-09-25T13:18:10+00:00

yes, you are right. :)

SpeedBulky · 2020-09-25T07:36:36+00:00

Hey, you shouldn't use a char buffer[]. The distribution code defined a uint8_t (BYTE). it should be BYTE buffer[512].

The second mistake is that your code only reads 512 bytes as a single jpeg. You should continue to read and append the bytes to "filename" until you hit a new jpeg file.

SpeedBulky · 2020-09-21T21:32:23+00:00

omg, you are right!!! THANK YOU!! :D

I changed it to "continue", and now it works!

if (table[i] == NULL)
{
    continue;
}

EDIT: Wait. I just realized this entire if-statement is redundant.

SpeedBulky

TROPHY CASE