Submission #1046578

#	Time	Username	Problem	Language	Result	Execution time	Memory
1046578		MrPavlito	Rack (eJOI19_rack)	C++17	100 / 100	5 ms	8016 KiB

rack

#include <bits/stdc++.h>
#define int long long
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define fi first
#define sc second
#define endl "\n"
#define pii pair<int,int>

using namespace std;

const int MAXN = 1e5+5;
const int mod7 = 1e9+7;
const long long inf = 1e18;

signed main()
{
    ios_base::sync_with_stdio(false),cin.tie(0), cout.tie(0);
    int tt=1;
    ///cin >> tt;
    while(tt--)
    {
        int n,k;
        cin >> n >> k;
        vector<int> stepen(n+1);
        int s = 1;
        stepen[0]=s;
        for(int i=1; i<=n; i++)
        {
            s *= 2;
            s = s%mod7;
            stepen[i] = s;
        }
        int rez = 0;
        for(int i=0; i<n; i++)
        {
            if(k%2 == 0)
            {
                rez= (rez+stepen[n- i-1])%mod7;
                k = k/2;
            }
            else k = k/2+1;
        }
        cout << (rez + 1)%mod7 << endl;
    }
}

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