View Compilation Error

0_0_28681998_20575.cpp:12:9: error: stray '#' in program
         b[a]++;
         ^
0_0_28681998_20575.cpp: In function 'int main()':
0_0_28681998_20575.cpp:12:10: error: lvalue required as unary '&' operand
         b[a]++;
          ^