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125.ValidPalindrome.cpp
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125.ValidPalindrome.cpp
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#include<bits/stdc++.h>
using namespace std;
class Solution {
public:
bool isPalindrome(string s) {
// string s1="",s2="";
// for(int i=0;i<s.length();i++)
// {
// if(isalnum(s[i]))
// {
// s1.push_back(s[i]);
// }
// }
// transform(s1.begin(),s1.end(),s1.begin(),::tolower);
// s2=s1;
// reverse(s1.begin(),s1.end());
// if(s2==s1)
// {
// return true;
// }
// return false;
string s1="",s2="";
for(int i=0;i<s.length();i++)
{
if(isalnum(s[i]))
s1.push_back(s[i]);
}
transform(s1.begin(),s1.end(),s1.begin(),::tolower);
int i=0,j=s1.length()-1;
while(i<s1.length() && j>=0)
{
if(s1[i]!=s1[j])
return false;
j--;
i++;
}
return true;
}
};