I was learning rabin karp algorithm and solving a basic problem of finding indices of pattern in a string with the help of string hashing technique. But the code is just not printing out anything.

I used this algorithm yesterday to solve a problem and got AC but now I'm unable to find where's the issue.

here's my code-

#include 
using namespace std;

typedef long long ll;
ll mod = 1000000007;
#define max 100005
int p = 31;

ll hashfunction[max], power[max];

void precompute(string text, int n){

    power[0]=1;
    hashfunction[0] = text[0]-'a'+1;
    ll pow = p;
    for(int i=1; i

ll getHash(int l, int r){
    if(l==0) return hashfunction[r];
    else return (mod + hashfunction[r] — (hashfunction[l-1]*power[r-l+1])%mod)%mod;
}

ll computeHashofstring(string pattern){
    ll hash_value = 0;
    for(int i=0; i

vector solve(string text, string pattern){

    vector v;

    precompute(text, text.length());
    ll hashofpattern = computeHashofstring(pattern);

    int left=0, right=pattern.length()-1;
    while (right

int main(){

    string text, pattern;
    cin >> text >> pattern;

    vector v = solve(text, pattern);

    for(int i=0; i<< v[i] << '\n';

    return 0;
}