oj.uz

Submission #675725

# Submission time Handle Problem Language Result Execution time Memory
675725 2022-12-27T19:04:16 Z Alma Rack (eJOI19_rack) C++17
0 / 100
 0 ms 212 KB 
#include <bits/stdc++.h>
using namespace std;

using ll = long long;
ll MOD = 1e9+7;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    ll n, k;
    cin >> n >> k;
    ll pos = 1, add = n;
    bool inv = false;

    vector<int> powMOD(n+1);
    powMOD[0] = 1;
    for (int i = 1; i <= n; i++) {
        powMOD[i] = (powMOD[i-1] * 2) % MOD;
    }

    int i = 0;
    while (i < n) {
        if ((1 << i) > k) {
            break;
        }
        add--;
        if (inv == false) {
            if ((k & (1 << i))) {
                inv = true;
            } else {
                pos += powMOD[add];
                pos %= MOD;
            }
        } else {
            if ((k & (1 << i))) {
                pos += powMOD[add];
                pos %= MOD;
            }
        }
        i++;
    }
    while (i < n) {
        add--;
        pos += powMOD[add];
        pos %= MOD;
        i++;
    }
 
    cout << pos << '\n';

    return 0;
}

Subtask #1
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 60.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -