Submission #237577

#	Time	Username	Problem	Language	Result	Execution time	Memory
237577		Half	Rack (eJOI19_rack)	C++14	40 / 100	5 ms	384 KiB

rack

#include <iostream>
#include <vector>
#include <set>
#include <map>
#include <algorithm>
#include <cmath>

using namespace std;

typedef vector<int> vi;
typedef pair<int,int> pi;
typedef long long ll;

#define loop(i,a,b) for (int i = a; i <= b; i++)

#define INF ((unsigned) ~0)
#define F first
#define S second
#define PB push_back
#define MP make_pair

const int MOD = 1000000007;

int main(){
    int n;
    ll k;
    cin >> n >> k;
    k--;
    ll res = 1;
    ll e;
    ll p;
    for(e = n - 1, p = 1; e >= 0; e--, p = (p * 2) % MOD)
        if(e < 60)
            if(k & (1<<e))
                res = (res + p) % MOD;
    cout << res << "\n";
}

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