Submission #882749

#	Time	Username	Problem	Language	Result	Execution time	Memory
882749		mariza	Rack (eJOI19_rack)	C++14	40 / 100	1 ms	348 KiB

rack

#include <bits/stdc++.h>
using namespace std;
 
//i/o optimisations
#define endl "\n"
#define fastio ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
 
//data types & structures
typedef long long ll;
#define pq priority_queue
 
//graph structures
typedef vector<pair<ll,ll>> graph;
typedef vector<ll> nw_graph;
typedef pq<pair<ll,ll>> dij_q;
 
//constant values
const ll N=2e5+1;
const ll N6=1e6+1;
const ll INF=1e9+1;
const ll LOGN=18;
const ll MOD=1e9+7;
 
//operations
#define MID ((l+r)/2)
#define RANGE (r-l+1)
 
//pairs
#define f first
#define s second
 
//output
#define YES cout<<"YES"<<endl;
#define NO cout<<"NO"<<endl;
 
int main(){
    fastio;
 
    ll n, k;
    cin>>n>>k; k--;
 
    ll ans=1;
    for(ll i=0; i<n; i++){
        if(k&1<<i){
            ans+=(1<<(n-i-1))%MOD; ans%=MOD;
        }
    }
 
    cout<<ans%MOD;
 
    return 0;
}

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