View difference between Paste ID: Eq0E2San and XvmTN651

 #include <iostream>
 #include <iomanip>
 #include <algorithm>
 
 using namespace std;
 
 // x >= y ? 1 : 0
 int x_ge_y(const int x, const int y)
 {
         return abs(abs(x - y) - 1 - abs(y - x - 1)) / 2;
 }
 
 // x < y ? 1 : 0
 int x_lt_y(const int x, const int y)
 {
         return 1 - x_ge_y(x, y);
 }
 
 int get_value(const int size, const int x, const int y)
 {
 	//coords if point 0;0 is the center of the square
         const int x_centric = x - (size - 1) / 2;
         const int y_centric = y - (size - 1) / 2;
 
 	//half-size and size of current sub-square
         const int current_subsquare_half = max(abs(x_centric), abs(y_centric));
         const int current_subsquare = current_subsquare_half * 2 + 1;
 
 	//coords local for current subsquare (0;0 is top-left)
         const int x_local = x_centric + current_subsquare_half;
         const int y_local = y_centric + current_subsquare_half;
 
 	//top-right = top-right triangle, includes main diagonal; bottom-left = bottom-left triangle
         const int top_right_value = x_ge_y(x_local, y_local) * (x_local + y_local);
         const int bottom_left_value = x_lt_y(x_local, y_local) * (2 * (current_subsquare - 1) + ((current_subsquare - 1) - x_local) + ((current_subsquare - 1) - y_local));
 
 	//local sub-square value (point 0;0 contains value 0, proceed CW)
         const int inverted_value_local = top_right_value + bottom_left_value;
 	//local sub-squre value, if we count from its center (center point contains 1)
         const int inverted_value = current_subsquare * current_subsquare - 1 - inverted_value_local;
 
 	//proper final value
         return size * size - inverted_value;
 }
 
 int main()
 {
         cout << "------" << endl;
 
         const int size = 9;
 
         for (int i = 0; i < size; ++i)
         {
                 for (int j = 0; j < size; ++j)
                 {
                         cout << setw(3) << get_value(size, j, i);
                 };
                 cout << endl;
         };
 
         cout << "------" << endl;
         return 0;
 }