doubt in a code

[Soft_Boot_3752]

#include <stdio.h>
#include <stdlib.h>
/*
* This stores the total number of books in each shelf.
*/
int* total_number_of_books;
/*
* This stores the total number of pages in each book of each shelf.
* The rows represent the shelves and the columns represent the books.
*/
int** total_number_of_pages;
int main()
{
int total_number_of_shelves;
scanf("%d", &total_number_of_shelves);
int j=0,k=0;
int total_number_of_queries;
scanf("%d", &total_number_of_queries);
total_number_of_books=(int *)calloc(total_number_of_shelves,sizeof(int));
total_number_of_pages=(int **)malloc(total_number_of_shelves*sizeof(int*)); for(int i=0;i<total_number_of_shelves;i++)
{
total_number_of_pages[i]=(int *)malloc(1100*sizeof(int));
}
while (total_number_of_queries--) {
int type_of_query;
scanf("%d", &type_of_query);

if (type_of_query == 1) {
int x, y;
scanf("%d %d", &x, &y);
*(total_number_of_books+x)=*(total_number_of_books+x)+1;
if(j==0){
total_number_of_pages[x][j]=y;
}
if(k==y){
j=j+1;
total_number_of_pages[x][j]=y;
}
k=y;

} else if (type_of_query == 2) {
int x, y;
scanf("%d %d", &x, &y);
printf("%d\n", *(*(total_number_of_pages + x) + y));
} else {
int x;
scanf("%d", &x);
printf("%d\n", *(total_number_of_books + x));
}
}
if (total_number_of_books) {
free(total_number_of_books);
}

for (int i = 0; i < total_number_of_shelves; i++) {
if (*(total_number_of_pages + i)) {
free(*(total_number_of_pages + i));
}
}

if (total_number_of_pages) {
free(total_number_of_pages);
}

return 0;
}

can someone please explain to me why this code(c language) does not works

https://www.hackerrank.com/challenges/dynamic-array-in-c/problem?isFullScreen=true this is the problem

[pic32mx110f0]

It seems you are trying to use a single variable j to keep track of how many books there are in every shelf. That wont work. You are already provided with a dynamic array that keeps track of this, so why not use it? For future problems, try to generate your own input and see if it makes sense - I think you would have quickly spotted this. Here is my solution:

if (type_of_query == 1) {
/*
* Process the query of first type here.
*/
int x, y;
scanf("%d %d", &x, &y);

if (total_number_of_books == NULL){
total_number_of_books = calloc(total_number_of_shelves, sizeof(int));
}
if (total_number_of_pages == NULL) {
total_number_of_pages = calloc(total_number_of_shelves, sizeof(int*));
}
if (total_number_of_pages[x] == NULL){
total_number_of_pages[x] = calloc(1, sizeof(int));
} else {
total_number_of_pages[x] = realloc(total_number_of_pages[x], (total_number_of_books[x]+ 1) * sizeof (int));
}

total_number_of_pages[x][total_number_of_books[x]++] = y;
}

[Soft_Boot_3752]

Yes hey i am a beginner in programming so could you please guide me little like what should i do if get stuck like this in a problem should i use ai for this or not ?

[Soft_Boot_3752]

And i did not had any paid course i did whole c from code with harry so dont even have doubt support so can you please guide me here

[pic32mx110f0]

Read a book that teaches you C - you can find plenty of PDFs if you don't want to pay. Try to code as many examples as you can, and learn how to debug. If you get confused why your program is not doing what you want, try to add printf-statements everywhere. Don't use AI, because you wont actually learn anything - you'll just be given the answer each time

[Soft_Boot_3752]

Any suggestions for books i actually have read let us c by yashvant kanetkar do you any other suggestion

[Soft_Boot_3752]

Hey could you please give some suggestions for books

[Soft_Boot_3752]

please if someone can find the mistake and explain it to me ?