Submission #1258392

#	Time	Username	Problem	Language	Result	Execution time	Memory
1258392		kaitou	Rack (eJOI19_rack)	C++20	40 / 100	0 ms	328 KiB

rack

#include <bits/stdc++.h>
using namespace std;
using L = long long;

const L MOD =  1e10 + 7;
L n, k, hasil = 1;

L modpow(L a,L b){
    L res = 1;
    
    while (b > 0){
        if (b & 1 ){
            res = (res * a) % MOD;
        }
            a = (a * a) % MOD;
            b >>= 1;
        
    }
    return res;
}

int main() {
    cin >> n  >> k;
    
    for (L i = n-1; i >= 0; i--){
        if (k % 2 == 0){
            hasil = (hasil + modpow(2 , i)) % MOD;
            
        }
        
        k = (k + 1)/2;
    }
	cout << hasil;
}

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 0 / 60