private static Move GetRandomCellToBePrint()
{
int k = Rand.Next(_globalCost);
var res = new Move();
while (true)
{
Parallel.For(0, _height, i =>
Parallel.For(0, _width, j =>
{
if (Expected[i][j] != Playground[i][j] && Expected[i][j] == '#')
{
lock (Lock)
{
k--;
if (k == 0)
{
res.R = i;
res.C = j;
}
}
}
}));
if (!res.IsDefault())
{
return res;
}
}
}