View Compilation Error

0_0_33235242_21168.cpp: In function 'void path()':
0_0_33235242_21168.cpp:16:14: error: 'b' was not declared in this scope
   if(A[i-1]==b[j-1])tmp=0;//此时两个字符相等，不用做操作
              ^
0_0_33235242_21168.cpp: In function 'int main()':
0_0_33235242_21168.cpp:57:1: error: expected '}' at end of input
 }
 ^