Querying the Document in C - Hacker Rank Solution

CodeWorld19

20 May, 2020

Problem

A document is represented as a collection paragraphs, a paragraph is represented as a collection of sentences, a sentence is represented as a collection of words and a word is represented as a collection of lower-case ([a-z]) and upper-case ([A-Z]) English characters.

You will convert a raw text document into its component paragraphs, sentences and words. To test your results, queries will ask you to return a specific paragraph, sentence or word as described below.

Alicia is studying the C programming language at the University of Dunkirk and she

represents the words, sentences, paragraphs, and documents using pointers:

A word is described by char* .
A sentence is described by char**. The words in the sentence are separated by one space (" "). The last word does not end with a space(" ").
A paragraph is described by char***. The sentences in the paragraph are separated by one period (".").
A document is described by char****. The paragraphs in the document are separated by one newline("\n"). The last paragraph does not end with a newline.

For example:

Learning C is fun.
Learning pointers is more fun.It is good to have pointers.

The only sentence in the first paragraph could be represented as:

char** first_sentence_in_first_paragraph = {"Learning", "C", "is", "fun"};

The first paragraph itself could be represented as:

char*** first_paragraph = {{"Learning", "C", "is", "fun"}};

The first sentence in the second paragraph could be represented as:

char** first_sentence_in_second_paragraph = {"Learning", "pointers", "is", "more", "fun"};

The second sentence in the second paragraph could be represented as:

char** second_sentence_in_second_paragraph = {"It", "is", "good", "to", "have", "pointers"};

The second paragraph could be represented as:

char*** second_paragraph = {{"Learning", "pointers", "is", "more", "fun"}, {"It", "is", "good", "to", "have", "pointers"}};

Finally, the document could be represented as:

char**** document = {{{"Learning", "C", "is", "fun"}}, {{"Learning", "pointers", "is", "more", "fun"}, {"It", "is", "good", "to", "have", "pointers"}}};

Alicia has sent a document to her friend Teodora as a string of characters, i.e. represented by char* not char****. Help her convert the document to char**** form by completing the following functions:

char**** get_document(char* text) to return the document represented by char****.
char*** kth_paragraph(char**** document, int k) to return the kth Paragraph
char** kth_sentence_in_mth_paragraph(char**** document, int k, int m) to return the kth sentence in the mth paragraph.
char* kth_word_in_mth_sentence_of_nth_paragraph(char**** document, int k, int m, int n) to return the kth word in the mth sentence of the nth paragraph.

Input Format :

The first line contains the integer paragraph_count.
Each of the next paragraph_count lines contains a paragraph as a single string.
The next line contains the integer q, the number of queries.

Each of the next q lines or groups of lines contains a query in one of the following formats:

1 The first line contains 1 k:

The next line contains an integer x, the number of sentences in the kth paragraph.
Each of the next x lines contains an integer a[i], the number of words in the ith sentence.
This query corresponds to calling the function kth_paragraph.

2 The first line contains 2 k m:

The next line contains an integer x, the number of words in the kth sentence of the mth paragraph.
This query corresponds to calling the function kth_sentence_in_mth_paragraph

3 The only line contains 3 k m n:

This query corresponds to calling the function kth_word_in_mth_sentence_of_nth_paragraph

Constraints :

The text which is passed to the get_document has words separated by a space (" "), sentences separated by a period (".") and paragraphs separated by a newline("\n").
The last word in a sentence does not end with a space.
The last paragraph does not end with a newline.
The words contain only upper-case and lower-case English letters.
1<= number of characters in the entire document <= 1000
1<= number of paragraphs in the entire document <= 5

Output Format :

Print the paragraph, sentence or the word corresponding to the query to check the logic of your code.

Sample Input 0 :

2
Learning C is fun.
Learning pointers is more fun.It is good to have pointers.
3
1 2
2
5
6
2 1 1
4
3 1 1 1

Sample Output 0 :

Learning pointers is more fun.It is good to have pointers.
Learning C is fun
Learning

Explanation 0 :

The first query corresponds to returning the second paragraph with 2 sentences of lengths 5 and 6 words. The second query correspond to returning the first sentence of the first paragraph. It contains words 4. The third query corresponds to returning the first word of the first sentence of the first paragraph.

Solution :

//Querying the Document - Hacker Rank Solution
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include<assert.h>
#define MAX_CHARACTERS 1005
#define MAX_PARAGRAPHS 5

char* kth_word_in_mth_sentence_of_nth_paragraph(char**** document, int k, int m, int n) 
{
    return document[n - 1][m - 1][k - 1];   
}

char** kth_sentence_in_mth_paragraph(char**** document, int k, int m) 
{ 
    return document[m - 1][k - 1];    
}

char*** kth_paragraph(char**** document, int k) 
{
    return document[k - 1];    
}

char**** get_document(char* text) 
{
    char ****doc = NULL;
    int i_paragraph = 0;
    int i_sentence = 0;
    int i_word = 0;

    doc = (char ****) malloc(sizeof(char ***));
    doc[0] = (char ***) malloc(sizeof(char **));
    doc[0][0] = (char **) malloc(sizeof(char *));

    char *word = NULL;

    for (char *s = text; *s; ++s)
    {
        if (*s == ' ' || *s == '.')
        {
            fprintf(stderr, "add word p%d s%d w%d: %.*s\n", i_paragraph, i_sentence, i_word, (int)(s - word), word);
            doc[i_paragraph][i_sentence][i_word] = word;

            i_word++;
            doc[i_paragraph][i_sentence] = (char **) realloc(doc[i_paragraph][i_sentence], sizeof(char *) * (i_word + 1));

            if (*s == '.' && s[1] != '\n')
            {
                i_word = 0;
                i_sentence++;

                doc[i_paragraph] = (char ***) realloc(doc[i_paragraph], sizeof(char **) * (i_sentence + 1));
                doc[i_paragraph][i_sentence] = (char **) malloc(sizeof(char *));
            }

            *s = 0;
            word = NULL;
        }

        else if (*s == '\n')
        {
            *s = 0;
            word = NULL;

            i_word = 0;
            i_sentence = 0;
            i_paragraph++;

            doc = (char ****) realloc(doc, sizeof(char ***) * (i_paragraph + 1));
            doc[i_paragraph] = (char ***) malloc(sizeof(char **));
            doc[i_paragraph][0] = (char **) malloc(sizeof(char *));
        }
        else
        {
            if (word == NULL)
            {
                word = s;
                //printf("new word: %s\n", word);
            }
        }
    }

    return doc;
}


char* get_input_text() 
{	
    int paragraph_count;
    scanf("%d", &paragraph_count);

    char p[MAX_PARAGRAPHS][MAX_CHARACTERS], doc[MAX_CHARACTERS];
    memset(doc, 0, sizeof(doc));
    getchar();
    for (int i = 0; i < paragraph_count; i++) 
    {
        scanf("%[^\n]%*c", p[i]);
        strcat(doc, p[i]);
        if (i != paragraph_count - 1)
            strcat(doc, "\n");
    }

    char* returnDoc = (char*)malloc((strlen (doc)+1) * (sizeof(char)));
    strcpy(returnDoc, doc);
    return returnDoc;
}

void print_word(char* word) 
{
    printf("%s", word);
}

void print_sentence(char** sentence) 
{
    int word_count;
    scanf("%d", &word_count);
    for(int i = 0; i < word_count; i++)
    {
        printf("%s", sentence[i]);
        if( i != word_count - 1)
            printf(" ");
    }
} 

void print_paragraph(char*** paragraph) 
{
    int sentence_count;
    scanf("%d", &sentence_count);
    for (int i = 0; i < sentence_count; i++) 
    {
        print_sentence(*(paragraph + i));
        printf(".");
    }
}

int main() 
{
    char* text = get_input_text();
    char**** document = get_document(text);

    int q;
    scanf("%d", &q);

    while (q--) 
    {
        int type;
        scanf("%d", &type);

        if (type == 3)
        {
            int k, m, n;
            scanf("%d %d %d", &k, &m, &n);
            char* word = kth_word_in_mth_sentence_of_nth_paragraph(document, k, m, n);
            print_word(word);
        }

        else if (type == 2)
        {
            int k, m;
            scanf("%d %d", &k, &m);
            char** sentence = kth_sentence_in_mth_paragraph(document, k, m);
            print_sentence(sentence);
        }

        else
        {
            int k;
            scanf("%d", &k);
            char*** paragraph = kth_paragraph(document, k);
            print_paragraph(paragraph);
        }
        printf("\n");
    }     
}

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Querying the Document in C - Hacker Rank Solution

Problem

Input Format :

Constraints :

Output Format :

Sample Input 0 :

Sample Output 0 :

Explanation 0 :

Solution :

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