Determining DNA Health

#include <bits/stdc++.h>
using namespace std;
int aInt = 'a';
int health[100000];
struct trie {
  struct trie* next[26];
  vector<int> term;
  trie() {
    for (int i = 0; i < 26 ; i++) {
      next[i] = NULL;
    }
    }
};
 
 trie *root;

void insert (char stringArray[],int index){
     trie *currentNode=root;
    for(int i=0; i<strlen(stringArray);i++){
        int idx = stringArray[i] -aInt;
        if (currentNode->next[idx] == NULL) {
          currentNode->next[idx] = new trie();
        }
        currentNode = currentNode->next[idx];
    }
    currentNode->term.push_back(index);
}
long calculateTotalHealth (char stringArray[],int beg, int end){
    struct trie *currentNode;
    long totalHealth=0;
    int increaseString;
    long stringLength=strlen(stringArray);
    for(int i=0;i<stringLength;i++){
        increaseString=i;
        currentNode = root->next[stringArray[i] - aInt];
        while (currentNode != NULL && stringLength > increaseString) {
          if (!(currentNode->term.empty())) {
            for (auto k : currentNode->term) {
              if(k>=beg && k<=end){
                  totalHealth+=health[k];
              }
            }
          }
          currentNode =
              currentNode->next[stringArray[increaseString + 1] - aInt];
          increaseString++;
      }
    }
    return totalHealth;
}
int main()
{
    root= new trie();
char allStringsTogether[2000001];
int n,s;
scanf("%d",&n);

for(int i=0; i<n ; i++){
    scanf("%s",allStringsTogether);
    insert(allStringsTogether,i);
 }

for ( int i=0; i<n ; i++){
scanf("%d",&health[i]);
}
scanf("%d",&s);
int genesStart,genesEnd;
long long totalHealth=0;
long long min=20000000000000;
long long max=-1;
for(int i=0; i<s;i++){
    scanf("%d%d%s",&genesStart,&genesEnd,allStringsTogether);
totalHealth=calculateTotalHealth(allStringsTogether,genesStart,genesEnd);
 if(totalHealth>max){
     max=totalHealth;
 }
 if(totalHealth<min){
     min=totalHealth;
 }
 totalHealth=0;
}
cout<<min<<" "<<max;
    return 0;
}