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Submission #463618

# Submission time Handle Problem Language Result Execution time Memory
463618 2021-08-11T11:19:52 Z Elias Rack (eJOI19_rack) C++17
100 / 100
 13 ms 7884 KB 
#include <bits/stdc++.h>

using namespace std;

#define int long long

#define modder 1000000007LL

vector<int> power2Mod;

int solve(int n, int k)
{
	if (n == 0)
		return 1;
	if (k % 2LL) // k is odd -> left subtree
		return solve(n - 1LL, (k + 1LL) / 2LL);
	else
		return (solve(n - 1, k / 2) + power2Mod[n - 1]) % modder;
}

signed main()
{
	cin.tie(0);
	ios_base::sync_with_stdio(false);
	int n, k;
	cin >> n >> k;

	power2Mod = vector<int>(n, 1);

	for (int i = 1; i < n; i++)
	{
		power2Mod[i] = (power2Mod[i - 1] * 2) % modder;
	}

	cout << solve(n, k);
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 308 KB Output is correct
5 Correct 0 ms 204 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 308 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct

Subtask #3
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 308 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 716 KB Output is correct
15 Correct 13 ms 7884 KB Output is correct