View Compilation Error

0_0_36355500_6433.cpp: In function 'int main()':
0_0_36355500_6433.cpp:32:27: error: cannot convert 'std::map<std::basic_string<char>, int>' to 'void*' for argument '1' to 'void* memset(void*, int, size_t)'
   memset(num,0,sizeof(num));
                           ^