static void Main()
{
var numberOfOperations = int.Parse(Console.ReadLine());
var myStack = new Stack <int>();
var stringBuilder = new StringBuilder();
for (int i = 0; i < numberOfOperations; i++)
{
var currentCommand = Console.ReadLine()
.Split()
.ToArray();
var action = currentCommand[0];
switch (action)
{
case "1":
var numToPush = int.Parse(currentCommand[1]);
myStack.Push(numToPush); break;
case "2":
if (myStack.Count > 0)
{
myStack.Pop();
}
break;
case "3":
if (myStack.Count > 0)
{
stringBuilder.AppendLine(myStack.Max().ToString());
}
break;
case "4":
if (myStack.Count > 0)
{
stringBuilder.AppendLine(myStack.Min().ToString());
}
break;
default:
break;
}
}
stringBuilder.Append(string.Join(", ", myStack));
Console.WriteLine(string.Join(Environment.NewLine, stringBuilder));
}
static void Main()
{
ulong numbEntries = ulong.Parse(Console.ReadLine());
var numStack = new Stack <ulong>();
ulong maxVal = 0;
for (ulong i = 0; i < numbEntries; i++)
{
ulong[] ulLine = Console.ReadLine()
.Trim()
.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)
.Select(ulong.Parse)
.ToArray();
switch (ulLine[0])
{
case 1:
//ulong bNumber = ulLine[1];
numStack.Push(ulLine[1]);
if (ulLine[1] > maxVal)
{
maxVal = ulLine[1];
}
break;
case 2:
var elem = numStack.Pop();
if (numStack.Count > 0 && elem == maxVal)
{
maxVal = numStack.Max();
}
else if (numStack.Count == 0 && elem == maxVal)
{
maxVal = 0;
}
break;
case 3:
Console.WriteLine(maxVal);
break;
}
}
}