oj.uz

Submission #675718

# Submission time Handle Problem Language Result Execution time Memory
675718 2022-12-27T18:51:32 Z Alma Rack (eJOI19_rack) C++17
40 / 100
 1 ms 212 KB 
#include <bits/stdc++.h>
using namespace std;

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

ll calcMODpow(int b, int p) {
    if (p == 0) return 1;
    ll x = calcMODpow(b, p/2);
    if (p % 2 == 1) {
        return (((x*x) % MOD)*b) % MOD;
    } else {
        return (x*x) % MOD;
    }
}

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

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

    for (ll i = 0; i < n; i++) {
        add--;
        if (inv == false) {
            if ((k & (1 << i))) {
                inv = true;
            } else {
                pos += calcMODpow(2, add);
                pos %= MOD;
            }
        } else {
            if ((k & (1 << i))) {
                pos += calcMODpow(2, add);
                pos %= MOD;
            } else {
                inv = true;
            }
        }
    }

    cout << pos << '\n';

    return 0;
}

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 0 ms 212 KB Output is correct

Subtask #3
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 0 ms 212 KB Output is correct
11 Incorrect 0 ms 212 KB Output isn't correct
12 Halted 0 ms 0 KB -