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Submission #438411

# Submission time Handle Problem Language Result Execution time Memory
438411 2021-06-27T23:49:23 Z NintsiChkhaidze Rack (eJOI19_rack) C++14
100 / 100
 10 ms 7884 KB 
#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define left (node<<1),l,((l+r)>>1)
#define right ((node<<1)|1),((l+r)>>1) + 1,r
#define s second
#define f first
#define pii pair<int,int>
#define mod 1000000007
#define int ll

using namespace std;
const int N = 1000005;
ll pwr[N];
 
main (){
    ios_base::sync_with_stdio(0),cin.tie(NULL),cout.tie(NULL);
    
    int n,k;
    cin>>n>>k;
    
    pwr[0] = 1;
    for (int i = 1; i <= n; i++)
        pwr[i] = (pwr[i - 1]*2)%mod;
        
    ll ans = 1;
    while (n){
        if (!(k%2)) ans = (pwr[n - 1] + ans)%mod;
        n--;
        k = (k + 1)/2;
    }
    
    cout<<ans;
}

Compilation message

rack.cpp:16:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   16 | main (){
      | ^~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct

Subtask #2
20.0 / 20.0

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

Subtask #3
60.0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 704 KB Output is correct
15 Correct 10 ms 7884 KB Output is correct