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Submission #272830

# Submission time Handle Problem Language Result Execution time Memory
272830 2020-08-18T15:56:46 Z EJOI2019Andrew Rack (eJOI19_rack) C++14
40 / 100
 1 ms 288 KB 
#include<bits/stdc++.h>
using namespace std;
string ans;
map<int,int>freq;
long long int MOD=1000000007;
void rack(long long int k)
{
if(k==1&&freq[k]>1)
return;
if(k%2)
ans+='L';
else
ans+='R';
int fn(0);
if(k%2)
fn=1;
k/=2;
k+=fn;
++freq[k];
rack(k);
}
long long int solve(long long int n)
{
long long int l(1),r(pow(2,n));
for(int i=0; i<ans.length(); ++i)
{
long long int mid=(l+r)/2;
if(ans[i]=='R')
l=mid+1;
else
r=mid-1;
l%=MOD;
r%=MOD;
}
return l;
}
int main()
{
long long int n,k;
cin>>n>>k;
rack(k);
cout<<solve(n);
return 0;
}

Compilation message

rack.cpp: In function 'long long int solve(long long int)':
rack.cpp:25:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 | for(int i=0; i<ans.length(); ++i)
      |              ~^~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 1 ms 288 KB Output is correct
4 Correct 1 ms 256 KB Output is correct
5 Correct 1 ms 256 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 1 ms 288 KB Output is correct
4 Correct 1 ms 256 KB Output is correct
5 Correct 1 ms 256 KB Output is correct
6 Correct 1 ms 256 KB Output is correct
7 Correct 1 ms 256 KB Output is correct
8 Correct 1 ms 256 KB Output is correct
9 Correct 1 ms 256 KB Output is correct
10 Correct 0 ms 256 KB Output is correct

Subtask #3
0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 1 ms 288 KB Output is correct
4 Correct 1 ms 256 KB Output is correct
5 Correct 1 ms 256 KB Output is correct
6 Correct 1 ms 256 KB Output is correct
7 Correct 1 ms 256 KB Output is correct
8 Correct 1 ms 256 KB Output is correct
9 Correct 1 ms 256 KB Output is correct
10 Correct 0 ms 256 KB Output is correct
11 Incorrect 0 ms 256 KB Output isn't correct
12 Halted 0 ms 0 KB -