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Submission #464356

# Submission time Handle Problem Language Result Execution time Memory
464356 2021-08-13T05:31:22 Z tengiz05 Rack (eJOI19_rack) C++17
100 / 100
 19 ms 15436 KB 
#include <bits/stdc++.h>

using i64 = long long;

constexpr int P = 1000000007;

constexpr i64 inf = 2e18;

int norm(int x) {
    if (x < 0) x += P;
    if (x >= P) x -= P;
    return x;
}

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    
    i64 n, k;
    std::cin >> n >> k;
    k--;
    
    std::vector<i64> mpw(n + 1, 1), pw(n + 1, 1);
    for (int i = 1; i <= n; i++) {
        mpw[i] = mpw[i - 1] * 2 % P;
        pw[i] = std::min(pw[i - 1] * 2, inf);
    }
    
    int ans = 0;
    for (int i = 0; i < n; i++) {
        if (k >= pw[n - i - 1]) {
            ans = norm(ans + mpw[i]);
            k -= pw[n - i - 1];
        }
    }
    
    std::cout << norm(ans + 1) << "\n";
    
    return 0;
}


/*




0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15




*/

Subtask #1
20.0 / 20.0

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

Subtask #3
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 1 ms 372 KB Output is correct
14 Correct 2 ms 1100 KB Output is correct
15 Correct 19 ms 15436 KB Output is correct