public void removeRandomValue()
{
Random rnd = new Random();
int i = rnd.Next(gridSize);
int j = rnd.Next(gridSize);
if (grid[i, j] > 0)
{
int oldValue = grid[i, j];
grid[i, j] = 0;
solver.NewGrid(grid.Clone() as int[, ]);
int res = solver.Run();
if (res == 0 && CompareSolveGrid(solver.GetGrid()))
{
nbRemove++;
return;
}
grid[i, j] = oldValue;
}
}
