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Submission #999796

# Submission time Handle Problem Language Result Execution time Memory
999796 2024-06-16T06:59:40 Z vjudge1 Rack (eJOI19_rack) C++17
100 / 100
 3 ms 348 KB 
#include <bits/stdc++.h>
using namespace std;
#define mod 1000000007
#define ll unsigned long long
ll binpow(ll a, ll b){
    ll res = 1;
    while(b != 0){
        if (b % 2 == 0){
            b /= 2;
            a *= a;
            a %= mod;
        }
        else{
            b--;
            res *= a;
            res %= mod;
        }
    }
    return res;
}
ll f(ll n, ll k, ll va){
    va %= mod;
    ll ans = 0;
    if (n == 0){
        return 0;
    }
    if (n <= 63){
        ll ag = pow(2ull, n - 1);
        if (ag < k){
            ans += va;
            ans += f(n - 1, k - ag, va * 2);
            return ans;
        }
    }
    ans += f(n - 1, k, va * 2);
    return ans;
}
int main(){
    ll n, k;
    cin>>n>>k;
    cout<<(f(n, k, 1) + 1) % mod;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 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 0 ms 348 KB Output is correct

Subtask #2
20.0 / 20.0

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