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Program.cs
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Program.cs
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using System;
using System.Collections.Generic;
namespace FlattenNestedListIterator
{
interface NestedInteger
{
bool IsInteger();
int GetInteger();
IList<NestedInteger> GetList();
}
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
}
public class NestedIterator
{
private Stack<int> nums;
public NestedIterator(IList<NestedInteger> nestedList)
{
nums = new Stack<int>();
DFS(nestedList);
}
private void DFS(IList<NestedInteger> nestedList)
{
for (int i = nestedList.Count - 1; i >= 0; i--)
{
if(nestedList[i].IsInteger())
nums.Push(nestedList[i].GetInteger());
else
DFS(nestedList[i].GetList());
}
}
public bool HasNext()
{
return nums.Count != 0;
}
public int Next()
{
return nums.Pop();
}
}
}