View Compilation Error

0_0_28361827_12272.cpp: In function 'int main()':
0_0_28361827_12272.cpp:24:13: error: base operand of '->' has non-pointer type 'std::map<int, int>'
   if(max < m->second){
             ^
0_0_28361827_12272.cpp:25:11: error: base operand of '->' has non-pointer type 'std::map<int, int>'
    max = m->second;
           ^