Book writing

#include <iostream>

using namespace std;

long long MOD;

long long pmod(long long i, long long e){
    if(e==0)
        return 1%MOD;
    if(e%2==1)
        return (i * pmod(i,e-1))%MOD;
    long long asd=pmod(i,e/2);
    return (asd*asd)%MOD;
}

int main() {
    long long n;
    cin>>n>>MOD;
    cout<<pmod(3,n-1)<<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