View Compilation Error

0_0_24316145_6144.cpp: In function 'int main()':
0_0_24316145_6144.cpp:45:27: error: 'memset' was not declared in this scope
     memset(pd,0,sizeof(pd));  
                           ^
0_0_24316145_6144.cpp:84:68: error: cannot convert 'std::vector<int>::iterator {aka __gnu_cxx::__normal_iterator<int*, std::vector<int> >}' to 'const char*' for argument '1' to 'int remove(const char*)'
                 arr[v].erase(remove(arr[v].begin(),arr[v].end(),now),arr[v].end());  
                                                                    ^