Submission #981408

#	Time	Username	Problem	Language	Result	Execution time	Memory
981408		Faisal_Saqib	Hexagonal Territory (APIO21_hexagon)	C++17	Compilation error	0 ms	0 KiB

hexagon

#include "hexagon.h"
#include "grader.cpp"
#include <vector>
using namespace std;
#define ll long long
const ll mod=1e9+7;
ll powmod(ll a,ll b,ll mod)
{
  if(b==0)
  {
    return 1;
  }
  if(b==1)
  {
    return a;
  }
  ll cp=powmod(a,b/2,mod);
  cp=(cp*cp)%mod;
  if(b%2)
  {
    cp=(cp*a)%mod;
  }
  return cp;
}
int draw_territory(int N, int A, int B,std::vector<int> D, std::vector<int> L) {
  ll total_cell=L[0]+1,two=2;
  total_cell=(((total_cell*(total_cell+1))%mod)*powmod(two,mod-2,mod))%mod;
  ll ap=A;
  ll ans=(total_cell*ap)%mod;
  // cell with distance i are i+1
  // So (i*b)*(i+1)
  // Sum of ((i*(i+1))) *b
  ll po=(powmod(2,n+1,mod)*b)%mod;
  // (i+1 C 2) = 2**(i+2)
  ans=(ans+po)%mod;
  return ans;
  // return (total_cell*ap)%mod;
}

Compilation message (stderr)

hexagon.cpp: In function 'int draw_territory(int, int, int, std::vector<int>, std::vector<int>)':
hexagon.cpp:33:19: error: 'n' was not declared in this scope
   33 |   ll po=(powmod(2,n+1,mod)*b)%mod;
      |                   ^
hexagon.cpp:33:28: error: 'b' was not declared in this scope
   33 |   ll po=(powmod(2,n+1,mod)*b)%mod;
      |                            ^