public static bool isExpressionValid(char[] array)
{
StackOperations stack = new StackOperations(array.Length);
foreach (var item in array)
{
if (item == '{' || item == '[' || item == '(')
{
stack.Push(item);
}
else
{
if (stack.IsEmpty())
{
return(false);
}
if (!isParenthesesMatching(Convert.ToChar(stack.Pop()), item))
{
return(false);
}
}
}
if (stack.IsEmpty())
{
return(true);
}
else
{
return(false);
}
}
public void Push(int x)
{
if (stack.IsEmpty())
{
minElement = x;
stack.Push(x);
}
else if (x < minElement)
{
minElement = x;
}
else
{
stack.Push(x);
}
}