2096 : 내려가기 [C++]

#include <iostream>

using namespace std;

class Stair
{
private:
 int Stairs[3];
 int UpMost[3] = { 0,0,0 };
 int UpLeast[3] = { 0,0,0 };
 int Num;
public:
 Stair(int n);
 void Descend();
};

Stair::Stair(int n)
{
 this->Num = n;
}

void Stair::Descend()
{
 int A, B, C, D;

 cin >> this->Stairs[0] >> this->Stairs[1] >> this->Stairs[2];

 this->UpMost[0] = this->Stairs[0];
 this->UpMost[1] = this->Stairs[1];
 this->UpMost[2] = this->Stairs[2];

 this->UpLeast[0] = this->Stairs[0];
 this->UpLeast[1] = this->Stairs[1];
 this->UpLeast[2] = this->Stairs[2];

 for(int i = 1; i < this->Num; i++)
 {
  cin >> this->Stairs[0] >> this->Stairs[1] >> this->Stairs[2];

  A = (this->UpMost[0] + this->Stairs[0]) < (this->UpMost[1] + this->Stairs[0]) ? this->UpMost[1] + this->Stairs[0] : this->UpMost[0] + this->Stairs[0];
  B = (this->UpMost[0] + this->Stairs[1]) < (this->UpMost[1] + this->Stairs[1]) ? this->UpMost[1] + this->Stairs[1] : this->UpMost[0] + this->Stairs[1];
  C = B < (this->UpMost[2] + this->Stairs[1]) ? (this->UpMost[2] + this->Stairs[1]) : B;
  D = (this->UpMost[2] + this->Stairs[2]) < (this->UpMost[1] + this->Stairs[2]) ? this->UpMost[1] + this->Stairs[2] : this->UpMost[2] + this->Stairs[2];

  this->UpMost[0] = A;
  this->UpMost[1] = C;
  this->UpMost[2] = D;

  A = (this->UpLeast[0] + this->Stairs[0]) > (this->UpLeast[1] + this->Stairs[0]) ? this->UpLeast[1] + this->Stairs[0] : this->UpLeast[0] + this->Stairs[0];
  B = (this->UpLeast[0] + this->Stairs[1]) > (this->UpLeast[1] + this->Stairs[1]) ? this->UpLeast[1] + this->Stairs[1] : this->UpLeast[0] + this->Stairs[1];
  C = B > (this->UpLeast[2] + this->Stairs[1]) ? (this->UpLeast[2] + this->Stairs[1]) : B;
  D = (this->UpLeast[2] + this->Stairs[2]) > (this->UpLeast[1] + this->Stairs[2]) ? this->UpLeast[1] + this->Stairs[2] : this->UpLeast[2] + this->Stairs[2];

  this->UpLeast[0] = A;
  this->UpLeast[1] = C;
  this->UpLeast[2] = D;
 }

 cout << ((this->UpMost[0] < this->UpMost[1] ? this->UpMost[1] : this->UpMost[0]) < this->UpMost[2] ? this->UpMost[2] : (this->UpMost[0] < this->UpMost[1] ? this->UpMost[1] : this->UpMost[0])) << " ";
 cout << ((this->UpLeast[0] > this->UpLeast[1] ? this->UpLeast[1] : this->UpLeast[0]) > this->UpLeast[2] ? this->UpLeast[2] : (this->UpLeast[0] > this->UpLeast[1] ? this->UpLeast[1] : this->UpLeast[0]));
}


int main()
{
 int Num;
 cin >> Num;

 Stair S(Num);
 
 S.Descend();

 return 0;
}