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Copy pathValidParentheses.cs
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40 lines (37 loc) · 989 Bytes
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ClassLibrary2
{
public class ValidParentheses
{
public int LongestValidParentheses(string s)
{
int longest = 0;
var current = 0;
Stack<int> stack = new Stack<int>();
stack.Push(-1);
for (int i = 0; i < s.Length; i++)
{
if (s[i] == '(')
{
stack.Push(i);
}
else if (s[i] == ')')
{
stack.Pop();
if (stack.Count > 0)
{
current = i - stack.Peek();
if (current > longest)
longest = current;
}
else stack.Push(i);
}
}
return longest;
}
}
}