View Compilation Error

0_0_29401518_1542.cpp: In function 'int main()':
0_0_29401518_1542.cpp:37:32: error: 'S' was not declared in this scope
         while (ss[i + P[i]] == S[i - P[i]])
                                ^
0_0_29401518_1542.cpp:43:24: error: 'q' was not declared in this scope
             MaxRight = q - 1;
                        ^