Vsesib2

#include <iostream>
#include <vector>
using namespace std;

int main()
{
    int n = 0, m = 0;
    scanf("%d%d", &n, &m);

    vector<vector<char>> tab(n, vector<char>(m, ' '));

    int x, y, guy = 1;
    int f = 0, s = 0;

    while (true)
    {
        cin >> x >> y;
        x--, y--;

        if (x < 0)
            break;

        auto place = [&tab, &x, &y, &m, &n] (char ne, char old, int& guy1, int& guy2)
        {
          int up = x - 1;

          for (; up >= 0; up--)
              if (tab[up][y] == ne)
                  break;

          if (up != -1)
          {
              for (int i = x - 1; i > up; i--)
              {
                  if (tab[i][y] == old)
                      guy2--;

                  tab[i][y] = ne;
                  guy1++;
              }
          }

          int down = x + 1;

          for (; down < n; down++)
              if (tab[down][y] == ne)
                  break;

          if (down != n)
          {
              for (int i = x + 1; i < down; i++)
              {
                  if (tab[i][y] == old)
                      guy2--;

                  tab[i][y] = ne;
                  guy1++;
              }
          }

          int right = y + 1;

          for (; right < m; right++)
              if (tab[x][right] == ne)
                  break;

          if (right != m)
          {
              for (int i = y + 1; i < right; i++)
              {
                  if (tab[x][i] == old)
                      guy2--;

                  tab[x][i] = ne;
                  guy1++;
              }
          }

          int left = y - 1;

          for (; left >= 0; left--)
              if (tab[x][left] == ne)
                  break;

          if (left != -1)
          {
              for (int i = y - 1; i > left; i--)
              {
                  if (tab[x][i] == old)
                      guy2--;

                  tab[x][i] = ne;
                  guy1++;
              }
          }
        };

        if (guy & 1)
        {
            if (tab[x][y] == 'B')
                s--;

            if (tab[x][y] != 'A')
            {
                tab[x][y] = 'A';
                f++;
            }

            place('A', 'B', f, s);
        }

        else
        {
            if (tab[x][y] == 'A')
                f--;

            if (tab[x][y] != 'B')
            {
                tab[x][y] = 'B';
                s++;
            }

            place('B', 'A', s, f);
        }

        cout << f - s << endl;
        guy++;
    }

    return 0;
}