#include <iostream> 
#include <vector>
using namespace std;
 
template <typename T> 
class matrix 
{ 
  vector<T> data_; 
  size_t y_size_; 
 
public: 
  matrix(size_t x_size, size_t y_size) 
    : data_(x_size * y_size) 
    , y_size_(y_size) 
  {} 
 
  const T& operator () (size_t i, size_t j) const 
  { 
    return data_[i * y_size_ + j]; 
  } 
 
  T& operator () (size_t i, size_t j) 
  { 
    return data_[i * y_size_ + j]; 
  } 
}; 
 
int main()
{
}

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