View Compilation Error

0_0_14973225_27993.cpp: In function 'void get_inverse(int)':
0_0_14973225_27993.cpp:28:5: error: 'cheng' was not declared in this scope
     cheng[0]=1; chu[0]=1;
     ^
0_0_14973225_27993.cpp:28:17: error: 'chu' was not declared in this scope
     cheng[0]=1; chu[0]=1;
                 ^