Submission #267037

#	Time	Username	Problem	Language	Result	Execution time	Memory
267037		VusetOrucov	Rack (eJOI19_rack)	C++17	100 / 100	2 ms	512 KiB

rack

#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#define black_tree tree<ll,null_type,less_equal<ll>,rb_tree_tag,tree_order_statistics_node_update>
#define gp __gnu_pbds
#define INF 1000000000
#define MOD 1000000007
#define MAX 1000001
#define endl '\n'
#define ll long long
#define ld long double
#define lli long long int
#define ull unsigned long long
#define ulli unsigned long long int
#define pb push_back
#define pf push_front
#define ook order_of_key
#define fbo find_by_order
#define np next_permutation
#define mp make_pair
#define eb emplace_back 
#define me max_element
#define lb lower_bound 
#define ub upper_bound
#define bs binary_search
#define ff first
#define ss second
using namespace std;
using namespace gp;
ll n,k,ans=1,dp[MAX];
ll q(ll a,ll b){
    ll f=1;
    while(b!=0){
        if(b%2==1){
        	f=(f*a)%MOD;
		}
        b/=2;
        a=(a*a)%MOD;
	}
    return f;
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n>>k;
	for(int i=n-1;i>=0;i--){
		if(!(k%2)){
			ans=(ans+q(2,i))%MOD;
		}
		k=(k+1)/2;
	}
	cout<<ans;
}

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