Submission #464359

#	Time	Username	Problem	Language	Result	Execution time	Memory
464359		amunduzbaev	Rack (eJOI19_rack)	C++14	100 / 100	10 ms	7884 KiB

rack

#include "bits/stdc++.h"
using namespace std;

#define int long long

const int mod = 1e9+7;
int pw(int a, int b){
	int rr = 1;
	while(b){
		if(b&1) rr = rr * a % mod;
		a = a * a % mod, b >>= 1;
	} return rr;
}

void solve(){
	int n, k; cin>>n>>k;
	vector<int> bit(n);
	
	for(int i=0;i<(int)bit.size();i++){
		n--;
		if(n > 62){
			bit[i] = 0;
		} else {
			if(k <= (1ll << n)) bit[i] = 0;
			else bit[i] = 1, k -= (1ll << n);
		}
	}
	
	//~ for(int i=0;i<(int)bit.size();i++) cout<<bit[i]<<" ";
	//~ cout<<"\n";
	
	int res = 1, pw = 1;
	for(int i=0;i<(int)bit.size();i++){
		if(bit[i]) res = (res + pw) % mod;
		pw = (pw * 2ll) % mod;
	} 
	
	cout<<res<<"\n";
}

signed main(){
	ios_base::sync_with_stdio(0); cin.tie(0);
	int t = 1;
	//~ cin>>t;
	while(t--) solve();
}

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