Book writing

#include <bits/stdc++.h>

using namespace std;
long long n, m;

long long pow(long long b, long long e){
    if(e == 0)
        return 1;
    else if(e == 1)
        return b;
    long long lol = pow(b, e/2);
    lol = (lol*lol)%m;
    if(e%2 == 1){
        lol*=b;
        lol%=m;
    }
    return lol;
}
int main(){
    
    cin >> n >> m;
    cout << pow(3, n-1);
    return 0;
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: WRONG ANSWER

Test 12

Verdict: WRONG ANSWER

Test 13

Verdict: WRONG ANSWER

Test 14

Verdict: WRONG ANSWER

Test 15

Verdict: WRONG ANSWER