Submission #951823

#	Time	Username	Problem	Language	Result	Execution time	Memory
951823		EJIC_B_KEDAX	Rack (eJOI19_rack)	C++17	100 / 100	6 ms	4188 KiB

rack

#include <bits/stdc++.h>

#include <random>
#ifndef LOCAL
//#pragma GCC optimize("O3")
    //#pragma GCC optimize("Ofast")
    //#pragma GCC optimize("unroll-loops")
    #pragma GCC target("avx,avx2,bmi,bmi2,popcnt,lzcnt")
#endif
using namespace std;
typedef long long ll;
typedef double dd;
typedef long double ld;
typedef unsigned int uii;
#define x first
#define y second
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()

void solve();

mt19937_64 mt(1);

int32_t main() {
#ifdef LOCAL
    freopen("input.in", "r", stdin);
    freopen("output.out", "w", stdout);
#else
    ios::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    //freopen("amusing.in", "r", stdin);
    //freopen("amusing.out", "w", stdout);
#endif
    cout << fixed << setprecision(30);
    int tests = 1;
    //cin >> tests;
    while (tests--) {
        solve();
    }
}

const int mod = 1000000007;

void solve() {
    ll n, k;
    cin >> n >> k;
    vector<int> i2(n);
    i2[0] = 1;
    for (int i = 1; i < n; i++) {
        i2[i] = (i2[i - 1] * 2) % mod;
    }
    int ans = 1;
    for (int i = n - 1; i >= 0; i--) {
        if (!(k % 2)) {
            ans += i2[i];
            ans %= mod;
        }
        k = (k + 1) / 2;
    }
    cout << ans << '\n';
}

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