#include <string>

#include <string.h>

using std::string;

class Solution {

public:

bool isIsomorphic(string s, string t) {

int sSize = s.size();

int tSize = t.size();

if(sSize != tSize)

{

return false;

}

char charMap[256];

char mapped[256];

memset(charMap, '\0', sizeof(charMap));

memset(mapped, 0, sizeof(mapped));

for(int index = 0; index < sSize; ++index)

{

if(charMap[s[index]] == '\0')

{

if(mapped[t[index]])

{

return false;

}

charMap[s[index]] = t[index];

mapped[t[index]] = 1;

}

else if(charMap[s[index]] != t[index])

{

return false;

}

}

return true;

}

};