Submission #4018282
Source Code Expand
#include<bits/stdc++.h> #define MOD (1000000007) #define LL long long using namespace std; LL n,k,ans; vector<LL>v,f; LL Qpow(LL a,LL b) { LL ans=1; while (b) { if (b&1) ans=ans*a%MOD; a=a*a%MOD; b>>=1; } return ans; } int main() { cin>>n>>k; for (int i=1; i<=sqrt(n); ++i) if (n%i==0) { v.push_back(i); if (n/i!=i) v.push_back(n/i); } sort(v.begin(),v.end()); f.resize(v.size()); for (int i=0,sz=v.size(); i<sz; ++i) { f[i]=Qpow(k,(v[i]+1)/2); for (int j=0; j<i; ++j) if (v[i]%v[j]==0) (f[i]-=f[j])%=MOD; if (v[i]%2) (ans+=f[i]*v[i]%MOD)%=MOD; else (ans+=f[i]*v[i]/2%MOD)%=MOD; } cout<<(ans+MOD)%MOD<<endl; }
Submission Info
Submission Time | |
---|---|
Task | F - Rotated Palindromes |
User | Refun |
Language | C++14 (GCC 5.4.1) |
Score | 1000 |
Code Size | 691 Byte |
Status | AC |
Exec Time | 13 ms |
Memory | 256 KB |
Judge Result
Set Name | Sample | All | ||||
---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 1000 / 1000 | ||||
Status |
|
|
Set Name | Test Cases |
---|---|
Sample | 0_00.txt, 0_01.txt, 0_02.txt, 0_03.txt |
All | 0_00.txt, 0_01.txt, 0_02.txt, 0_03.txt, 1_00.txt, 1_01.txt, 1_02.txt, 1_03.txt, 1_04.txt, 1_05.txt, 1_06.txt, 1_07.txt, 1_08.txt, 1_09.txt, 1_10.txt, 1_11.txt, 1_12.txt, 1_13.txt, 1_14.txt, 1_15.txt, 1_16.txt, 1_17.txt, 1_18.txt, 1_19.txt, 1_20.txt, 1_21.txt, 1_22.txt, 1_23.txt, 1_24.txt, 1_25.txt, 1_26.txt, 1_27.txt, 1_28.txt, 1_29.txt, 1_30.txt, 1_31.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
0_00.txt | AC | 1 ms | 256 KB |
0_01.txt | AC | 1 ms | 256 KB |
0_02.txt | AC | 1 ms | 256 KB |
0_03.txt | AC | 2 ms | 256 KB |
1_00.txt | AC | 1 ms | 256 KB |
1_01.txt | AC | 1 ms | 256 KB |
1_02.txt | AC | 2 ms | 256 KB |
1_03.txt | AC | 2 ms | 256 KB |
1_04.txt | AC | 1 ms | 256 KB |
1_05.txt | AC | 1 ms | 256 KB |
1_06.txt | AC | 1 ms | 256 KB |
1_07.txt | AC | 1 ms | 256 KB |
1_08.txt | AC | 2 ms | 256 KB |
1_09.txt | AC | 2 ms | 256 KB |
1_10.txt | AC | 2 ms | 256 KB |
1_11.txt | AC | 2 ms | 256 KB |
1_12.txt | AC | 2 ms | 256 KB |
1_13.txt | AC | 2 ms | 256 KB |
1_14.txt | AC | 2 ms | 256 KB |
1_15.txt | AC | 2 ms | 256 KB |
1_16.txt | AC | 13 ms | 256 KB |
1_17.txt | AC | 13 ms | 256 KB |
1_18.txt | AC | 13 ms | 256 KB |
1_19.txt | AC | 13 ms | 256 KB |
1_20.txt | AC | 12 ms | 256 KB |
1_21.txt | AC | 12 ms | 256 KB |
1_22.txt | AC | 12 ms | 256 KB |
1_23.txt | AC | 12 ms | 256 KB |
1_24.txt | AC | 1 ms | 256 KB |
1_25.txt | AC | 2 ms | 256 KB |
1_26.txt | AC | 1 ms | 256 KB |
1_27.txt | AC | 2 ms | 256 KB |
1_28.txt | AC | 1 ms | 256 KB |
1_29.txt | AC | 2 ms | 256 KB |
1_30.txt | AC | 1 ms | 256 KB |
1_31.txt | AC | 2 ms | 256 KB |