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#include <vector>
#include <iostream>
 
struct Point
{
	int x;
	int y;
	bool isAlive;
};
std::vector<Point> gameBoard;
std::vector<Point> bufferGirlNextDoor;
std::vector<Point> bufferNewBorn;
 
void checkNumForBorn(Point);
void checkNumForDead(Point&);
void checkGirlNextDoor(Point);
void createGameBoard()
{
	gameBoard.push_back(Point{ 0,0,true });
	gameBoard.push_back(Point{ 1,0,true });
	gameBoard.push_back(Point{ 2,0,true });
}
 
void mainLoop()
{
	createGameBoard();
	while (true)
	{
		bufferNewBorn.clear();
		for each (Point p in gameBoard)
		{
			checkGirlNextDoor(p);
			checkNumForBorn(Point{ p.x-1, p.y, true });
			checkNumForBorn(Point{ p.x-1, p.y+1, true });
			checkNumForBorn(Point{ p.x, p.y+1, true });
			checkNumForBorn(Point{ p.x+1, p.y+1, true });
			checkNumForBorn(Point{ p.x+1, p.y, true });
			checkNumForBorn(Point{ p.x+1, p.y-1, true });
			checkNumForBorn(Point{ p.x, p.y-1, true });
			checkNumForBorn(Point{ p.x-1, p.y-1, true });
			checkNumForDead(p);
		}
		for each (Point p in gameBoard)
		{
			if (p.isAlive) bufferNewBorn.push_back(p);
		}
		gameBoard.clear();
		gameBoard = bufferNewBorn;
		std::cout << gameBoard.size() << std::endl;
	}
}
void checkNumForBorn(Point currentPoint)
{
	int num = 0;
	bool isGirlNextDoor = false;
	for each (Point p in bufferGirlNextDoor)
	{
		if (p.x == currentPoint.x && p.y == currentPoint.y)
		{
			isGirlNextDoor = true;
			break;
		}
	}
	if (!isGirlNextDoor)
	{
		for each (Point p in bufferGirlNextDoor)
		{
			if (p.x > currentPoint.x - 2 && p.x < currentPoint.x + 2 && p.y > currentPoint.y - 2 && p.y < currentPoint.y + 2)
				++num;
			//добавить после тестов if (num > 2) break;
		}
	}
	if (num > 2) bufferNewBorn.push_back(currentPoint);
}
void checkNumForDead(Point &currentPoint)
{
	int num = 0;
	for each (Point p in bufferGirlNextDoor)
	{
		if (p.x > currentPoint.x - 2 && p.x < currentPoint.x + 2 && p.y > currentPoint.y - 2 && p.y < currentPoint.y + 2 && p.x != currentPoint.x && p.y != currentPoint.y)
			++num;
		//добавить после тестов if (num > 3) break;
	}
	if (num < 2 || num > 3) currentPoint.isAlive = false;
}
void checkGirlNextDoor(Point currentPoint)
{
	bufferGirlNextDoor.clear();
	for each(Point p in gameBoard)
	{
		if (p.x > currentPoint.x - 3 && p.x < currentPoint.x + 3 && p.y > currentPoint.y - 3 && p.y < currentPoint.y + 3 && p.x != currentPoint.x && p.y != currentPoint.y)
			bufferGirlNextDoor.push_back(p);
	}
}

prog.cpp: In function ‘void mainLoop()’:
prog.cpp:30:7: error: expected ‘(’ before ‘each’
   for each (Point p in gameBoard)
       ^~~~
       (
prog.cpp:30:19: error: expected primary-expression before ‘p’
   for each (Point p in gameBoard)
                   ^
prog.cpp:30:7: error: ‘each’ was not declared in this scope
   for each (Point p in gameBoard)
       ^~~~
prog.cpp:43:3: error: expected primary-expression before ‘for’
   for each (Point p in gameBoard)
   ^~~
prog.cpp:42:4: error: expected ‘;’ before ‘for’
   }
    ^
    ;
   for each (Point p in gameBoard)
   ~~~
prog.cpp:43:3: error: expected primary-expression before ‘for’
   for each (Point p in gameBoard)
   ^~~
prog.cpp:42:4: error: expected ‘)’ before ‘for’
   }
    ^
    )
   for each (Point p in gameBoard)
   ~~~
prog.cpp:30:7: note: to match this ‘(’
   for each (Point p in gameBoard)
       ^~~~
prog.cpp:43:7: error: expected ‘(’ before ‘each’
   for each (Point p in gameBoard)
       ^~~~
       (
prog.cpp:43:19: error: expected primary-expression before ‘p’
   for each (Point p in gameBoard)
                   ^
prog.cpp:47:18: error: could not convert ‘gameBoard.std::vector<Point>::clear()’ from ‘void’ to ‘bool’
   gameBoard.clear();
   ~~~~~~~~~~~~~~~^~
prog.cpp:48:28: error: expected ‘)’ before ‘;’ token
   gameBoard = bufferNewBorn;
                            ^
                            )
prog.cpp:43:7: note: to match this ‘(’
   for each (Point p in gameBoard)
       ^~~~
prog.cpp: In function ‘void checkNumForBorn(Point)’:
prog.cpp:56:6: error: expected ‘(’ before ‘each’
  for each (Point p in bufferGirlNextDoor)
      ^~~~
      (
prog.cpp:56:18: error: expected primary-expression before ‘p’
  for each (Point p in bufferGirlNextDoor)
                  ^
prog.cpp:56:6: error: ‘each’ was not declared in this scope
  for each (Point p in bufferGirlNextDoor)
      ^~~~
prog.cpp:64:2: error: expected primary-expression before ‘if’
  if (!isGirlNextDoor)
  ^~
prog.cpp:63:3: error: expected ‘;’ before ‘if’
  }
   ^
   ;
  if (!isGirlNextDoor)
  ~~
prog.cpp:64:2: error: expected primary-expression before ‘if’
  if (!isGirlNextDoor)
  ^~
prog.cpp:63:3: error: expected ‘)’ before ‘if’
  }
   ^
   )
  if (!isGirlNextDoor)
  ~~
prog.cpp:56:6: note: to match this ‘(’
  for each (Point p in bufferGirlNextDoor)
      ^~~~
prog.cpp:66:7: error: expected ‘(’ before ‘each’
   for each (Point p in bufferGirlNextDoor)
       ^~~~
       (
prog.cpp:66:19: error: expected primary-expression before ‘p’
   for each (Point p in bufferGirlNextDoor)
                   ^
prog.cpp:72:2: error: expected primary-expression before ‘}’ token
  }
  ^
prog.cpp:71:4: error: expected ‘;’ before ‘}’ token
   }
    ^
    ;
  }
  ~  
prog.cpp:72:2: error: expected primary-expression before ‘}’ token
  }
  ^
prog.cpp:71:4: error: expected ‘)’ before ‘}’ token
   }
    ^
    )
  }
  ~  
prog.cpp:66:7: note: to match this ‘(’
   for each (Point p in bufferGirlNextDoor)
       ^~~~
prog.cpp:72:2: error: expected primary-expression before ‘}’ token
  }
  ^
prog.cpp: In function ‘void checkNumForDead(Point&)’:
prog.cpp:78:6: error: expected ‘(’ before ‘each’
  for each (Point p in bufferGirlNextDoor)
      ^~~~
      (
prog.cpp:78:18: error: expected primary-expression before ‘p’
  for each (Point p in bufferGirlNextDoor)
                  ^
prog.cpp:78:6: error: ‘each’ was not declared in this scope
  for each (Point p in bufferGirlNextDoor)
      ^~~~
prog.cpp:84:2: error: expected primary-expression before ‘if’
  if (num < 2 || num > 3) currentPoint.isAlive = false;
  ^~
prog.cpp:83:3: error: expected ‘;’ before ‘if’
  }
   ^
   ;
  if (num < 2 || num > 3) currentPoint.isAlive = false;
  ~~
prog.cpp:84:2: error: expected primary-expression before ‘if’
  if (num < 2 || num > 3) currentPoint.isAlive = false;
  ^~
prog.cpp:83:3: error: expected ‘)’ before ‘if’
  }
   ^
   )
  if (num < 2 || num > 3) currentPoint.isAlive = false;
  ~~
prog.cpp:78:6: note: to match this ‘(’
  for each (Point p in bufferGirlNextDoor)
      ^~~~
prog.cpp: In function ‘void checkGirlNextDoor(Point)’:
prog.cpp:89:6: error: expected ‘(’ before ‘each’
  for each(Point p in gameBoard)
      ^~~~
      (
prog.cpp:89:17: error: expected primary-expression before ‘p’
  for each(Point p in gameBoard)
                 ^
prog.cpp:89:6: error: ‘each’ was not declared in this scope
  for each(Point p in gameBoard)
      ^~~~
prog.cpp:94:1: error: expected primary-expression before ‘}’ token
 }
 ^
prog.cpp:93:3: error: expected ‘;’ before ‘}’ token
  }
   ^
   ;
 }
 ~  
prog.cpp:94:1: error: expected primary-expression before ‘}’ token
 }
 ^
prog.cpp:93:3: error: expected ‘)’ before ‘}’ token
  }
   ^
   )
 }
 ~  
prog.cpp:89:6: note: to match this ‘(’
  for each(Point p in gameBoard)
      ^~~~
prog.cpp:94:1: error: expected primary-expression before ‘}’ token
 }
 ^

Standard output is empty