Submission #469564

#	Time	Username	Problem	Language	Result	Execution time	Memory
469564		FatihSolak	Rack (eJOI19_rack)	C++17	100 / 100	16 ms	17224 KiB

rack

#include <bits/stdc++.h>
#define N 1000005
#define int long long
using namespace std;
const int mod = 1e9+7;
int pw[N];
int get(int n,int k){
    if(n == 0)return 1;
    int ret = 0;
    if(k > pw[n-1]){
        ret = 1;
        k -= pw[n-1];
    }
    return (2*get(n-1,k) -1 +ret+mod)%mod;
}
void solve(){
    int n,k;
    cin >> n >> k;
    cout << get(n,k);
}

int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    #ifdef Local
    freopen("in.txt","r",stdin);
    freopen("out.txt","w",stdout);
    #endif
    pw[0] = 1;
    for(int i=1;i<N;i++){
        pw[i] = min((int)2e18,pw[i-1]*2);
    }
    int t=1;
    //cin>>t;
    while(t--){
        solve();
    }
    #ifdef Local
    cout<<endl<<fixed<<setprecision(2)<<1000.0 * clock() / CLOCKS_PER_SEC<< " milliseconds ";
    #endif
}

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