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Submission #1050841

# Submission time Handle Problem Language Result Execution time Memory
1050841 2024-08-09T15:14:25 Z ThommyDB Rack (eJOI19_rack) C++17
100 / 100
 6 ms 8028 KB 
#include<bits/stdc++.h>

using namespace std;

const int mod = 1e9+7;

long long n, k;

signed main(){
    cin >> n >> k;

    vector<long long> layers(n+1);

    layers[0]=1;
    long long s = 1;
    
    for(int i = 1; i <= n; i++){
        s*=2;
        s%=mod;
        layers[i] = s;
    }

    long long ans = 1;
    for(int i = 0; i < n; i++){
        if(k%2==0){//right
            k /=2;
            ans += layers[n-i-1];
            ans%=mod;
        }
        else{//left
            k++;
            k /= 2;
        }
    }

    cout << ans << "\n";
}

Subtask #1
20.0 / 20.0

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

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 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 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 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 1 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 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 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 860 KB Output is correct
15 Correct 6 ms 8028 KB Output is correct