Submission #465634

#	Time	Username	Problem	Language	Result	Execution time	Memory
465634		Error42	Rack (eJOI19_rack)	C++14	100 / 100	5 ms	292 KiB

rack

#include <iostream>
#include <vector>

using namespace std;

using uint = unsigned int;
using ll = long long;
using ull = unsigned long long;

const ull mod = 1000000007;

int main()
{
    ull n, k;
    cin >> n >> k;
    k--;
    ull ans = 0;
    for (int i = 0; i < n; i++) {
        ans *= 2;
        ans += k % 2;
        ans %= mod;
        k /= 2;
    }
    ans++;
    ans %= mod;
    cout << ans << "\n";
}

Compilation message (stderr)

rack.cpp: In function 'int main()':
rack.cpp:18:23: warning: comparison of integer expressions of different signedness: 'int' and 'ull' {aka 'long long unsigned int'} [-Wsign-compare]
   18 |     for (int i = 0; i < n; i++) {
      |                     ~~^~~

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