View Compilation Error

0_0_30436201_28682.cpp: In function 'int main()':
0_0_30436201_28682.cpp:82:35: error: 's' was not declared in this scope
   for(int i=0;s1[i];++i) sam1.Add(s[i]-'a');
                                   ^
0_0_30436201_28682.cpp:84:35: error: 's' was not declared in this scope
   for(int i=0;s2[i];++i) sam2.Add(s[i]-'a');
                                   ^