Submission #999757

#	Time	Username	Problem	Language	Result	Execution time	Memory
999757		LilPluton	Rack (eJOI19_rack)	C++14	40 / 100	0 ms	348 KiB

rack

#include <bits/stdc++.h>
// author : Pluton
#define OPT         ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define int         ll
#define ll          long long
#define pb          push_back
#define arr         array
#define fi          first
#define se          second
#define rep(i,j,k)  for(int i = j; i <= k; ++i)
#define all(a)      a.begin(),a.end()
#define pii         pair<int,int>
using namespace std;
const int INF = 1e18;

struct BIT
{
    int n;
    vector<int> ft;
    void init(int N)
    {
        n = N + 5;
        ft.assign(n + 5, 0);
    }
    void add(int pos, int val)
    {
        for (pos = pos + 1; pos <= n; pos += pos & -pos) ft[pos] += val;
    }
    int get(int pos, int res = 0)
    {
        for (pos = pos + 1; pos > 0; pos -= pos & -pos) res += ft[pos];
        return res;
    }
};
const int md = 1e9 + 7;
void _()
{
    int n, k;
    cin >> n >> k;
    --k;
    int r = 0;
    int i = 0;
    rep(i, 0, 60)
    {
        if(k & (1LL << i))
        {
            r += 1LL << (n - i - 1);
            r %= md;
        }
    }
    cout << (r + 1) % md << '\n';
}

signed main()
{
    OPT
    int tc = 1;
    while(tc--)
    {
        _();
    }
}

Compilation message (stderr)

rack.cpp: In function 'void _()':
rack.cpp:42:9: warning: unused variable 'i' [-Wunused-variable]
   42 |     int i = 0;
      |         ^

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