Structure.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#define max_char 1005
#define max_par 5

struct word {
    char* data;
};

struct sentence {
    struct word* data;
    int word_count;//denotes number of words in a sentence
};

struct paragraph {
    struct sentence* data  ;
    int sentence_count;//denotes number of sentences in a paragraph
};

struct document {
    struct paragraph* data;
    int paragraph_count;//denotes number of paragraphs in a document
};

struct word get_word(char* text, int beg, int end) {
    struct word answer;
    answer.data = calloc(end - beg + 2, sizeof(char));
    int index = 0;
    int i;
    for (i = beg; i <= end; i++)
        answer.data[index++] = text[i];
    answer.data[index] = 0;
    return answer;
}

struct sentence get_sentence(char* text, int beg, int end) {
    struct sentence answer;
    answer.word_count = 1;
    int i;
    for (i = beg; i <= end; i++)
        if (text[i] == ' ')
            ++answer.word_count;
    answer.data = calloc(answer.word_count, sizeof(struct word));
    int start = beg;
    int index = 0;
    for (i = beg; i <= end; i++)
        if (text[i] == ' ')
        {
            answer.data[index++] = get_word(text, start, i - 1);
            start = i + 1;
        }
    answer.data[index] = get_word(text, start, i - 1);
    return answer;
}

struct paragraph get_paragraph(char* text, int beg, int end) {
    struct paragraph answer;
    answer.sentence_count = 0;
    int i;
    for (i = beg; i <= end; i++)
        if (text[i] == '.')
            ++answer.sentence_count;
    answer.data = calloc(answer.sentence_count, sizeof(struct sentence));
    int start = beg;
    int index = 0;
    for (i = beg; i <= end; i++)
        if (text[i] == '.')
        {
            answer.data[index++] = get_sentence(text, start, i - 1);
            start = i + 1;
        }
    return answer;
}

struct document get_document(char* text) {
    struct document answer;
    answer.paragraph_count = 1;
    int i;
    for (i = 0; text[i]; i++)
        if (text[i] == '\n')
            ++answer.paragraph_count;
    answer.data = calloc(answer.paragraph_count, sizeof(struct paragraph));
    int start = 0;
    int index = 0;
    for (i = 0; text[i]; i++)
        if (text[i] == '\n')
        {
            answer.data[index++] = get_paragraph(text, start, i - 1);
            start = i + 1;
        }
    answer.data[index] = get_paragraph(text, start, i - 1);
    return answer;
}

struct word kth_word_in_mth_sentence_of_nth_paragraph(struct document Doc, int k, int m, int n) {
    return Doc.data[n - 1].data[m - 1].data[k - 1];
}

struct sentence kth_sentence_in_mth_paragraph(struct document Doc, int k, int m) {
    return Doc.data[m - 1].data[k - 1];
}

struct paragraph kth_paragraph(struct document Doc, int k) {
    return Doc.data[k - 1];
}

void print_word(struct word w) {
    printf("%s", w.data);
}

void print_sentence(struct sentence sen) {
    for(int i = 0; i < sen.word_count; i++) {
        print_word(sen.data[i]);
        if (i != sen.word_count - 1) {
            printf(" ");
        }
    }
}

void print_paragraph(struct paragraph para) {
    for(int i = 0; i < para.sentence_count; i++){
        print_sentence(para.data[i]);
        printf(".");
    }
}

void print_document(struct document doc) {
    for(int i = 0; i < doc.paragraph_count; i++) {
        print_paragraph(doc.data[i]);
        if (i != doc.paragraph_count - 1)
            printf("\n");
    }
}

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

    char p[max_par][max_char], doc[max_char];
    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;
}

int main() {
    char* text = get_input_text();
    struct document Doc = 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);
            struct word w = kth_word_in_mth_sentence_of_nth_paragraph(Doc, k, m, n);
            print_word(w);
        }

        else if (type == 2) {
            int k, m;
            scanf("%d %d", &k, &m);
            struct sentence sen= kth_sentence_in_mth_paragraph(Doc, k, m);
            print_sentence(sen);
        }

        else{
            int k;
            scanf("%d", &k);
            struct paragraph para = kth_paragraph(Doc, k);
            print_paragraph(para);
        }
        printf("\n");
    }     
}