Book writing

#include <bits/stdc++.h>
 
using namespace std;
long long n, m;
 
long long powasdas(long long b, long long e){
    if(e == 0)
        return 1;
    //cout << "taalla fak" << endl;
    long long lol = powasdas(b, e/2);
    lol = (lol*lol)%m;
    if(e%2 == 1){
        lol*=b;
        lol%=m;
    }
    //cout << b << " ^ " << e <<  " = " << lol << endl;
    return lol;
}
 
long long wtf(long long j){
    long long ans = 1;
    for(long long i = 0; i < j; ++i){
        ans+=2*wtf(i);
    }
    return ans;
}
int main(){
    
    cin >> n >> m;
    long long lol = (powasdas(3, n-1))%m;
    lol = (lol)%m;
    cout << lol << endl;
    //cout << wtf(n) << endl;
    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED