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Submission #999710

# Submission time Handle Problem Language Result Execution time Memory
999710 2024-06-16T05:41:21 Z vjudge1 Rack (eJOI19_rack) C++17
100 / 100
 1 ms 348 KB 
#pragma GCC optimize("Ofast")
#include"bits/stdc++.h"

#define int long long

using namespace std;

const int md = 1e9 + 7;

int bp(int k, int b) {
    if (0 == b) return 1;
    int r = bp(k, b / 2);
    if (b % 2) return (r * r * k) % md;
    return (r * r) % md;
}

signed main() {
    cin.tie(nullptr)->sync_with_stdio(false);

    int n, k;
    cin >> n >> k;

    k --;

    int r = 0;

    for (int i = 0; i < 62; i ++) {
        if (k & (1ll << i)) {
            (r += bp(2, n - i - 1)) %= md;
        }
    }

    cout << (r + 1) % md << '\n';
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct

Subtask #3
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 1 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct