View Compilation Error

0_0_20075416_1970.cpp: In function 'int A(int)':
0_0_20075416_1970.cpp:16:27: error: invalid conversion from 'int (*)(int)' to 'int' [-fpermissive]
         return A[s[a].last];
                           ^
0_0_20075416_1970.cpp:17:5: error: expected '}' before 'else'
     else
     ^