View Compilation Error

0_0_30305343_8456.cpp: In function 'void get_sg(int)':
0_0_30305343_8456.cpp:31:33: error: 'memset' was not declared in this scope
         memset(mex,0,sizeof(mex));
                                 ^
0_0_30305343_8456.cpp: In function 'int main()':
0_0_30305343_8456.cpp:44:8: error: 'cin' was not declared in this scope
  while(cin>>k,k)
        ^
0_0_30305343_8456.cpp:70:5: error: 'cout' was not declared in this scope
     cout<<"L";
     ^
0_0_30305343_8456.cpp:72:5: error: 'cout' was not declared in this scope
     cout<<"W";
     ^
0_0_30305343_8456.cpp:74:3: error: 'cout' was not declared in this scope
   cout<<endl;
   ^
0_0_30305343_8456.cpp:74:9: error: 'endl' was not declared in this scope
   cout<<endl;
         ^