Submission #1204154

#	Time	Username	Problem	Language	Result	Execution time	Memory
1204154		PlayVoltz	Rack (eJOI19_rack)	C++20	100 / 100	0 ms	328 KiB

rack

#include <cstdio>
#include <stdio.h>
#include <stdbool.h>
#include <iostream>
#include <map>
#include <vector>
#include <climits>
#include <stack>
#include <string>
#include <queue>
#include <algorithm>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <cmath>
#include <cctype>
#include <bitset>
#include <iomanip>
#include <cstring>
#include <numeric>
#include <cassert>
using namespace std;

#define int long long
#define pii pair<int, int>
#define mp make_pair
#define pb push_back
#define fi first
#define se second

const int MOD = 1000000007;

int expo(int a, int b){
	int res=1;
	for (;b;a=(a*a)%MOD, b>>=1)if (b&1)res=(res*a)%MOD;
	return res;
}

int32_t main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n, k, ans=0;
	cin>>n>>k, --k;
	for (int i=0; i<64; ++i)if (k&(1ll<<i))ans=(ans+expo(2, n-i-1))%MOD;
	cout<<ans+1;
}

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