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Copy path0159-LongestSubstringWithAtMostTwoDistinctCharacters.cs
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0159-LongestSubstringWithAtMostTwoDistinctCharacters.cs
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//-----------------------------------------------------------------------------
// Runtime: 72ms
// Memory Usage:
// Link:
//-----------------------------------------------------------------------------
using System;
namespace LeetCode
{
public class _0159_LongestSubstringWithAtMostTwoDistinctCharacters
{
public int LengthOfLongestSubstringTwoDistinct(string s)
{
char p1 = (char)0;
int p1Size = 0;
char p2 = (char)0;
int p2Size = 0;
int max = 0;
foreach (var ch in s)
{
if (p2 == (char)0)
{
p2 = ch;
p2Size = 1;
}
else if (p2 == ch)
{
p2Size++;
}
else if (p1 == ch)
{
p1 = p2;
p1Size += p2Size;
p2 = ch;
p2Size = 1;
}
else
{
p1 = p2;
p1Size = p2Size;
p2 = ch;
p2Size = 1;
}
max = Math.Max(max, p1Size + p2Size);
}
return max;
}
}
}