Questions tagged [trie]
The trie tag has no usage guidance.
149
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PSET5: Trying to implement dictionary.c using trie. But segmentation fault in check()
My implementation compiles but I am getting a segmentation fault when I execute. My program is working fine through the load function because the output screen shows this
"~/pset5/speller/ $ ./...
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1
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24
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trie speller check() function no mispellings
working on check() function and my trie data type seems to load ok with the full dictionary but check is unable to find any mispellings for a text file. I beleive I'm not correctly returning false ...
- 115
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100
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Pset4 Speller, Trie. Why are all words misspelled?
first time poster and new beginner.
I realize this question has been asked numerous times among different forums, but still after looking at other's code, I simply can't figure it out.
I have ran my ...
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32
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pset4 speller trie segmentation fault
I am doing the trie version of speller in pset4 and keep getting a segmentation fault.
I have run my code on short dictionaries and short text files and it seems to work just fine but when I try ...
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26
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Segmentation fault, speller trie pset 4
I'm getting a segmentation fault where i set
node *new = malloc(sizeof(node))
I don't understand why I'm getting this fault, i am just allocating new untouched memory with malloc.
// Implements a ...
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1
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25
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trie speller works on custom dict but misses mispellings on large dictionary
So my speller works fine with a custom dict, but not with the large dict.
This is my code in dictionary.c (haven't modified other files):
// Implements a dictionary's functionality
#include <...
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1
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72
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Stuck with Unload using trie
I could not unload the dictionary, and still don't understand why. It seems that it is not freeing what I think. I would really appreciate some help, here is my code:
// Unloads dictionary from ...
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1
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48
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Speller TRIE - all words misspelled?
I've hunted through StackExchange for similar questions and their advice but I'm still struggling to understand why my speller keeps throwing back all the words as misspelled? Would be massively ...
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1
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55
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pset4 speller unload trie leaking memory
I can't seem to figure out why my code is leaking memory, I think I have implemented recursion correctly, take a look at my unload code.
EDIT : I tried running my file with large dictionary and using ...
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1
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38
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Pset5 Trie Segmentation fault
Have been trying to debug this for days and eventually came down to the following problem: When running an example test(lalaland.txt) the misspelled words are fine up until the program abruptly stops(...
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47
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How Do I insert information into a trie?
I'm trying to insert true into the second branch of a node.
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
typedef struct node
{
bool correct;
struct node *...
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47
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Problem with pset4 2019 trie dictionary
I'm having problems with my trie dictionary.c file, if I try to run the whole program normally or through gdb, I'm getting no errors whatsoever and I'm getting the right answers.
Tho, when I try to ...
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41
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valgrind() causing IDE to shut down
working on pset4 speller via trie. I AM AWARE OF THE CLANG BUG. According to one of the answers in the original question i removed the -fsanitize flag and ran valgrind() on it while using a small ...
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205
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pset4/speller/trie
Since there was no help I repeat my question...I have a weird problem in speller using trie.... when I tested it on my Ubuntu visual studio code it works and compiles when using a dictionary of 4 ...
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68
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cs50 pset4 speller trie word too long "index 46 out of bounds for type 'char [46]'". Isn't that handled by the code already written?
My code is giving all the right answers (lalaland.txt), but valgrind says:
==9947==
dictionary.c:69:25: runtime error: index 46 out of bounds for type 'char [46]'
(and I printf the problem -
too ...
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67
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Speller Trie not reading apostrophes?
For a reason I have fruitlessly tried over and over to work out, my trie code, while functioning well in all other aspects, either is not reading apostrophes into its dictionary or is not properly ...
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136
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Pset 4: Speller (trie) - misspelled words
I'm stuck. In Speller, implemented with trie, I get more misspelled words than I should. The number of words loaded into the dictionary is correct, there are no leaks or error messages. When checking ...
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1
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57
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Pset5-- program isn't checking all words, marks all words it checks as misspelled
I've been running the code with the small dictionary and a sample text of "cat hgsgk caterpillar", so the code should theoretically return a wordcount of 3, and hgsgk as the only misspelled word. ...
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1
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48
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pset4 speller trie - Code passes check50 but the output does not match the staff output
Check50 returns all happy faces but my program doesn't find as many mispelled words as it should.
I'm not sure if the problem is my check function or my load function
I tried checking witih debug50 ...
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299
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PSET5 speller - I cannot understand tries at all
I am so completely lost. I completed PSET5 with a hash table, and the concept of hash tables makes sense to me. Now I am attempting to do it with a trie, and I am just so confused I don't even know ...
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61
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cs50 speller trie: (in c language) can't figure out what i'm doing wrong with load. Seems to work but seems non-existent in other functions
sorry if I am asking the question in a wrong way or my code is too messy I am knew here. My problem is that it looks like load works and the dictionary is loaded into the trie but check and unload ...
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1
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613
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Speller(trie) / my code can't handle most basic words and substrings properly
I need help. When I check my codes through check50,
I got a result like below
:) dictionary.c and dictionary.h exist
:) speller compiles
:( handles most basic words properly
expected "...
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113
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pset4 - speller trie load - ptr not linking up
I have been stuck on the load part of the speller exercise for the tries table. I have gone through a lot of the existing questions and come to the following code:
while (fscanf(file, "%s", word) != ...
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1
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95
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Pset5 load - Stuck in infinite nested while loop
I have been working on this problem set for some time. At the moment I am stuck at figuring out why the nested while loop is infinite despite of the fact that there is an fgetc() function that runs ...
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1
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177
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Memory leaks in Speller
My program passes all tests except the valgrind check.
I tried to find the cause of errors, but valgrind is too 'obscure' for me yet, I don't know what to do.
I guess some memory isn't freed, but I ...
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1
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186
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pset5 "words in dictionary" is 0
I'm not having much luck troubleshooting my speller code. It returns the correct misspelled words and words in text, but words in dictionary returns as 0. I ran valgrind and it said there is a leak in ...
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1
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347
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Pset5: Need Help with Check
My 'Check' function outputs words that are not misspelled and skips over the ones that actually are. It also doubles the words that it outputs. For instance, in a sentence "There was once a catapillar"...
- 157
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157
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Pset5 Speller : Check gives segmentation fault : Tries
I am not getting where the segmentation fault is happening.
// Implements a dictionary's functionality
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <...
- 111
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1
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81
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PSET 5 - how to use the least memory - the magic trie sauce
Ive successfully finished the pset, and am mid-tier on the Big Board - but I have become transfixed with reducing space/time complexity. The only secret sauce Ive been able to glean is that those ...
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93
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pset5 speller seems to work fine at first, but stops working halfway
I have been working on this error for couple days, but still cannot figure out what the problem is. The program compiles and finds the misspelled words in the beginning, but after printing out about 3/...
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1
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125
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Pset5 unload: how can I update Trie's data inside a recursive function?
few people suggested to use a recursive method of unloading a Trie data structure, but I am struggling with it a bit.
I am stuck on the part on how can I update the root node ( the main node which ...
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54
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speller compiles but horribly fails check50
i genuinely have no idea where the problem lies so any help would be appreciated, thanks in advance.
check function
bool check(const char *word)
{
trav = root;
int index = 0;
for (int ...
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1
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373
views
Pset5 speller: how can I navigate through the Trie and free the nodes?
so I am stuck on this PSET5 speller for a quite while now, trying different approaches, looking at available information in CS50, shorts, pset problem explanation and I couldn't get to free all the ...
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337
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Pset5: What To Do
I would really appreciate help with Pset5 load. I initially wanted to implement a hashtable into my code but after hours of looking I couldn't find a good hashtable from the internet that I wanted to ...
- 157
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1k
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PSET5: Hash function returning collisions
Looking for advice on hash functions and strings.
For PSET5, I decided to implement a trie but instead of storing [a - z] in each node, only storing [0 - 9]. For this to work, I hashed the words and ...
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113
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Pset 5 (speller): Problem with compiling due to 'declaration shadows a variable in the global scope;
I am using the trie structure for doing the pset5 speller. However, my program can't compile due to 'redefinition of node' in 'typedef struct node', and 'declaration shadows a variable in the global ...
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1
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122
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I don't understand how a trie works. Please help
I am on pset5 and have completed the check and load functions. However, with the unload function I am having trouble understanding how to visualize it. As suggested in the walkthrough, I tried to ...
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212
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Pset5 trie unload -recursive function does not free memory
im close to finish this problem set , but i cannot figure out the working recursive function, especially if backtracking may work in this form of implementation:
void rec_unload(node *trv)
{
for(...
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2
answers
78
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PSET5 Speller Trie Errors
So far, all other methods except check have already been implemented properly in my code. The problem with check is that it only returns true a lot fewer times than expected, which means that most ...
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451
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Pset 5 - struggling to understand how to check for NULL in a trie
I'm sure my code has a ton of errors, but I'm mostly on line 61 right now.
I'm getting this error: dictionary.c:61:25: error: invalid operands to binary expression ('struct node'
and 'void *')
...
user21490
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1
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39
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sizeof() syntax error with node pointer
Is there something wrong with my syntax? Won't compile, apparently because of line:
sizeof(node->sprouts) / sizeof(node)
above node defined as follows:
typedef struct node
{
bool is_word;
struct ...
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304
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pset5 speller trie load - Dictionary not loading
I am working through pset5 using the trie data structure and it has been very challenging. I finally have code that compiles but when I run it against cat.txt using the small dictionary it returns all ...
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59
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pset5, don't know if [load] successfully, [check] return no misspelled
could you please teach me how to make sure if i load the dictionary successfully.
when i run check, no word misspelled..
Thank you.
typedef struct node
{
bool is_word;
struct node *children[27];
} ...
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1
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643
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Need help with check in speller (trie)
Stuck on speller, especially check, but load has some problems too.
I am using a trie, but I kind of regret choosing it, because it has been very tough.
I believe my problem is with the use of *next ...
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1
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38
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Want to ask about a trie
I have referred various resources but still have a doubt regarding tries.
Do characters actually get stored in a trie? ( i think the answer is no)
Suppose we are storing CAT and CAB in a trie. We ...
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108
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pset5 2017 unload() trie segmentation fault and undefined behavior
Having a lot of trouble with unload(). I've scrapped nearly working functions several times just in the hopes that starting over will fix things. I cannot figure out why my code keeps leading to the ...
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78
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pset5 speller unload - node allocation quirk
Most of this pset5 has gone smoothly, but unload() has caused me problems. When I'm navigating down my data structure (trie) to locate a node with all NULL children, the last index has a memory ...
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2
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77
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pset5 - check50 compiles the code, but does not produce any output
I have been wandering through the code and forums for couple of hours now and I will be glad if you point out what I am doing wrong.
So, first of all, all checks I have made in the workspace passed. ...
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73
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pset5 trie leak on unload
The programme compiles fine but when i run help50 for leaks i get the following, though i have freed the children. i appreciate the help:
==11548== For counts of detected and suppressed errors, rerun ...
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74
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pset5 invalid read of size 8
the thing loads fine but it has problems along the line so i run help50 and it gives me the following feedback:
==8299==
==8299== HEAP SUMMARY:
==8299== in use at exit: 308,079,072 bytes in 1,...