Submission #791608

#	Time	Username	Problem	Language	Result	Execution time	Memory
791608		otarius	Rack (eJOI19_rack)	C++17	100 / 100	7 ms	4556 KiB

rack

#include <iostream>
#include <algorithm>
#include <vector>
#include <set>
#include <cstring>
#include <queue>
#include <map>
#include <cmath>
#include <iomanip>
using namespace std;

#define ff first
#define sc second
#define pb push_back
#define ll long long
#define pll pair<ll, ll>
#define pii pair <int, int>
#define ull unsigned long long

// #define int long long
// #define int unsigned long long

const ll inf = 1e9 + 7;
const ll weirdMod = 998244353;

ll ans = 0, cur = 1;
void solve() {
    ll n, k;
    cin >> n >> k; k--;
    vector<int> bin;
    while (k) {
        bin.pb(k % 2);
        k /= 2;
    } while (bin.size() < n) bin.pb(0);
    for (int i = n - 1; i >= 0; i--) {
        if (bin[i] == 1)
            (ans += cur) %= inf;
        (cur *= 2) %= inf;
    } cout << (ans + 1) % inf;
}
int32_t main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    
    int t = 1;
    // cin >> t;
    while (t--) {
        solve();
        cout << '\n';
    } return 0;
}

Compilation message (stderr)

rack.cpp: In function 'void solve()':
rack.cpp:34:25: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   34 |     } while (bin.size() < n) bin.pb(0);
      |              ~~~~~~~~~~~^~~

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