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Submission #607284

# Submission time Handle Problem Language Result Execution time Memory
607284 2022-07-26T14:25:20 Z xtk Rack (eJOI19_rack) C++17
100 / 100
 4 ms 212 KB 
#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast")
// #define int long long
#define fi first
#define se second
#define pb push_back
#define mp make_pair
const int MAXN=1e6+7;
const int MOD=1e9+7;
long long szybkie_potowanie(long long a, long long n) {
	long long w = 1;
	while (n>0) {
		if (n%2==1) {
			w=(w*a)%MOD;
		}
		a = (a*a)%MOD;
		n/=2;
	}
	return w;
}
int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	long long n, k;
	cin>>n>>k;
	k--;
	int ans=1;
	for (int i=1; i<=n; ++i) {
		if(k%2==1) {
			ans = ans*2+1;
			ans = ans % MOD;
		}
		else {
			ans *=2;
			ans = ans % MOD;
		}
		k/=2;
	}
	long long pow = szybkie_potowanie(2, n)-1LL; 
	cout<<(ans-pow + MOD) % MOD<<'\n';
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct

Subtask #3
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 4 ms 212 KB Output is correct