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search.cpp
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search.cpp
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// Do NOT add any other includes
#include "search.h"
void maxHeap::merge(NodeNew a[], NodeNew b[], int a_len, int b_len, NodeNew c[], int start)
{
int i = 0, j = 0;
while (i < a_len && j < b_len)
{
if (a[i].sentence_no < b[j].sentence_no)
{
c[start + i + j] = a[i];
i++;
}
else
{
c[start + i + j] = b[j];
j++;
}
}
while (i < a_len)
{
c[start + i + j] = a[i];
i++;
}
while (j < b_len)
{
c[start + i + j] = b[j];
j++;
}
}
void maxHeap::mergesort(NodeNew main[], int start, int main_len)
{
if (main_len <= 1)
{
return;
}
int a_len = main_len / 2;
int b_len = main_len - a_len;
NodeNew *a = new NodeNew[a_len];
NodeNew *b = new NodeNew[b_len];
for (int k = 0; k < a_len; k++)
a[k] = main[start + k];
for (int k = 0; k < b_len; k++)
b[k] = main[start + k + a_len];
mergesort(a, 0, a_len);
mergesort(b, 0, b_len);
merge(a, b, a_len, b_len, main, start);
delete[] a;
delete[] b;
}
maxHeap::maxHeap()
{
}
maxHeap::~maxHeap()
{
}
void maxHeap::insert(NodeNew n)
{
if(size==0)
{
maxHeapArr[0] = n;
size++;
return;
}
if(size<capacity-1)
{
maxHeapArr[size] = n;
size++;
int i = size - 1;
while(i>0 && maxHeapArr[parIdx(i)].sentence_no>maxHeapArr[i].sentence_no)
{
NodeNew temp = maxHeapArr[parIdx(i)];
maxHeapArr[parIdx(i)] = maxHeapArr[i];
maxHeapArr[i] = temp;
i = parIdx(i);
}
}
else if((size == capacity-1) &&count==0)
{
count++;
maxHeapArr[size] = n;
size++;
int i = size - 1;
while(i>0 && maxHeapArr[parIdx(i)].sentence_no>maxHeapArr[i].sentence_no)
{
NodeNew temp = maxHeapArr[parIdx(i)];
maxHeapArr[parIdx(i)] = maxHeapArr[i];
maxHeapArr[i] = temp;
i = parIdx(i);
}
mergesort(maxHeapArr, 0, size);
}
else if((size==capacity-1)&&count>0)
{
maxHeapArr[size] = n;
size++;
int i = size - 1;
while(i>0 && maxHeapArr[parIdx(i)].sentence_no>maxHeapArr[i].sentence_no)
{
NodeNew temp = maxHeapArr[parIdx(i)];
maxHeapArr[parIdx(i)] = maxHeapArr[i];
maxHeapArr[i] = temp;
i = parIdx(i);
}
}
else
{
if(n.sentence_no>maxHeapArr[0].sentence_no)
{
removeMin();
insert(n);
}
}
}
void maxHeap::removeMin()
{
size--;
maxHeapArr[0] = maxHeapArr[size];
HeapifyDown(0);
}
void maxHeap::HeapifyDown(int idx)
{
if(idx==size-1)
return;
if(rightIdx(idx)==size)
{
if(maxHeapArr[size-1].sentence_no>maxHeapArr[idx].sentence_no)
return;
else
{
NodeNew temp = maxHeapArr[size-1];
maxHeapArr[size-1] = maxHeapArr[idx];
maxHeapArr[idx] = temp;
return;
}
}
if(leftIdx(idx)>=size)
return;
if(maxHeapArr[idx].sentence_no<maxHeapArr[leftIdx(idx)].sentence_no && maxHeapArr[idx].sentence_no<maxHeapArr[rightIdx(idx)].sentence_no)
return;
if(maxHeapArr[leftIdx(idx)].sentence_no<maxHeapArr[rightIdx(idx)].sentence_no)
{
NodeNew temp = maxHeapArr[leftIdx(idx)];
maxHeapArr[leftIdx(idx)] = maxHeapArr[idx];
maxHeapArr[idx] = temp;
HeapifyDown(leftIdx(idx));
}
else
{
NodeNew temp = maxHeapArr[rightIdx(idx)];
maxHeapArr[rightIdx(idx)] = maxHeapArr[idx];
maxHeapArr[idx] = temp;
HeapifyDown(rightIdx(idx));
}
}
SearchEngine::SearchEngine(){
vector<Datastorer1*>v[128][128];
// Implement your function here
}
SearchEngine::~SearchEngine(){
// Implement your function here
}
int same(int i,int j){
if(i>j)return 1;
if(i<j)return -1;
return 0;
}
int issame(Datastorer1*d1,Datastorer1*d2){
if(same(d1->book_code,d2->book_code)!=0)return same(d1->book_code,d2->book_code);
if(same(d1->page,d2->page)!=0)return same(d1->page,d2->page);
if(same(d1->para,d2->para)!=0)return same(d1->para,d2->para);
if(same(d1->sentence_no,d2->sentence_no)!=0)return same(d1->sentence_no,d2->sentence_no);
if(d1->offset==-1+d2->offset)return 0;
if(d1->offset>-1+d2->offset)return 1;
else return -1;
}
vector<Datastorer1*> combine(vector<Datastorer1*>v1,vector<Datastorer1*>v2){
int i=0,j=0,k;
vector<Datastorer1*>ans;
int s1=v1.size(),s2=v2.size();
while(i<s1 && j<s2){
k=issame(v1[i],v2[j]);
///cout<<k<<endl;
if(k==1)j++;
else if(k==-1)i++;
else{
ans.push_back(v2[j]);
i++;
j++;
}
}
return ans;
}
void SearchEngine::insert_sentence(int book_code, int page, int paragraph, int sentence_no, string sentence){
sentence=" "+sentence;
for(int i=0;i<sentence.size()-1;i++){
int c1=tolower(sentence[i]);
int c2=tolower(sentence[i+1]);
Datastorer1*d=new Datastorer1(book_code,page,paragraph,sentence_no,i);
v[c1][c2].push_back(d);
}
// Implement your function here
return;
}
int isissame(Datastorer1*d1,Datastorer1*d2){
if(same(d1->book_code,d2->book_code)!=0)return same(d1->book_code,d2->book_code);
if(same(d1->page,d2->page)!=0)return same(d1->page,d2->page);
if(same(d1->para,d2->para)!=0)return same(d1->para,d2->para);
if(same(d1->sentence_no,d2->sentence_no)!=0)return same(d1->sentence_no,d2->sentence_no);
return same(d1->offset,d2->offset);
}
void srch(string pattern,vector<Datastorer1*>(&v)[128][128],vector<Datastorer1*>&ans){
if (pattern.size() == 1) {
int i = pattern[0];
ans.clear(); // Clear the vector to ensure it's empty
for (int j = 0; j < 128; j++) {
ans.insert(ans.end(), v[j][i].begin(), v[j][i].end());
}
// Sort ans in increasing order
for (int i = 0; i < ans.size(); i++) {
for (int j = i + 1; j < ans.size(); j++) {
if (isissame(ans[i], ans[j]) > 0) {
swap(ans[i], ans[j]);
}
}
}
for(Datastorer1*d:ans){
cout<<d->book_code<<" "<<d->page<<" "<<d->para<<" "<<d->sentence_no<<" "<<d->offset<<endl;
}
return;
}
int i=pattern[0];
int j=pattern[1];
ans=v[i][j];
int pos=2;
/* for(Datastorer1*d:ans){
cout<<(char)i<<' '<<(char)j<<' '<<d->book_code<<" "<<d->page<<" "<<d->para<<" "<<d->sentence_no<<" "<<d->offset<<endl;
} */
while(pos<pattern.size()){
int i=pattern[pos-1];
int j=pattern[pos];
/* for(Datastorer1*d:ans){
cout<<(char)i<<' '<<(char)j<<' '<<d->book_code<<" "<<d->page<<" "<<d->para<<" "<<d->sentence_no<<" "<<d->offset<<endl;
} */
ans=combine(ans,v[i][j]);
pos++;
}
}
Node* convert(Datastorer1*d,string pattern){
Node*n=new Node;
///cout<<d->book_code<<" "<<d->page<<" "<<d->para<<" "<<d->sentence_no<<" "<<d->offset<<endl;
n->book_code=d->book_code;
n->page=d->page;
n->paragraph=d->para;
n->sentence_no=d->sentence_no;
n->offset=d->offset-pattern.size()+1;
return n;
}
Node* SearchEngine::search(string pattern, int& n_matches){
vector<Datastorer1*>ans;
srch(pattern,v,ans);
/* for(Datastorer1*d:ans){
cout<<d->book_code<<" "<<d->page<<" "<<d->para<<" "<<d->sentence_no<<" "<<d->offset<<endl;
} */
n_matches=ans.size();
Node* head = nullptr;
Node* p = nullptr;
for (int i = 0; i < n_matches; i++) {
Node* newNode = convert(ans[i], pattern);
if (i == 0) {
head = p = newNode;
} else {
p->right = newNode;
newNode->left = p;
p = newNode;
}
}
// Implement your function here
if(n_matches==0)return nullptr;
return head;
}
void show(Node*d){
if(d==nullptr)return;
cout<<d->book_code<<" "<<d->page<<" "<<d->paragraph<<" "<<d->sentence_no<<" "<<d->offset<<endl;
show(d->right);
}